MASTER Net MASTER Database: GRB210912.31 page

Please use the reference to MASTER DataBase as Lipunov et al., 2010, MASTER Robotic Net, Advances in Astronomy, vol. 2010, p.30L

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GRB coord: ErrorBox (deg): Sys Error (deg):
Sattel : Trigger: Notice:
GRB_Name: trignum: Nights after: FullSky


Name FERMI GRB210912.31
Trignum 653124492
Trigger time 2021-09-12 07:28:07.46
Notice time 2021-09-12 07:35:45.421406
Coord, eb (19h 37m 24.00s , +14d 11m 24.0s) , 5.57
Max dist: 1 sigma 3 sigma
AGN candidates: Milliquas
r90wise
wiseXgaia
BL Lac candidates: 1 Sigma
3 Sigma

MASTER observatories and transients from them in error-field
Kislovodsk Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
Amur Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
Tunka Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
OAFA Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
IAC Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
SAAO Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
Tavrida Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
OAGH Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)

You are viewing outdated information, relevant error box is here

All alerts for this trigger
id noticetime coord2000 satel errorbox type trigger seq trig_type links
2812478 2025-03-15 01:54:49.692632 19h 37m 24.00s +14d 11m 24.0s FERMI 5.57 retraction 653124492 1 4044 retraction
1718340 2021-09-12 07:36:05.234586 19h 37m 24.00s +14d 11m 24.0s FERMI 5.57 alert 653124492 27 112 alert
1718339 2021-09-12 07:36:04.396757 19h 22m 55.99s +16d 22m 00.1s FERMI 8.3833 alert 653124492 35 111 alert

DAYS:

MASTER optical transients in this field
Will be published in GCN, ATEL

Synchronous WFC images
Distance datetime coord2000 observatory camera links
Errorbox center visibility at MASTER facilities
trigger notice notice+1hr now

2021-09-12 07:28:07 (JD 2459469.811192)

Siderial time 9.411834 h

Ra 19:37:24.00 Dec 14:11:24.00
(294.350000d, 14.190000d)

Rise 2021-09-12 13:08:40

Transit 2021-09-12 20:39:08

Set 2021-09-12 04:13:32

Amur

Object: Altitude: 27.82 Azimuth: 281.65

Sun: Altitude: 21.55 Azimuth: 69.29

Moon: Altitude: 20.01 Azimuth: 354.10

Tunka

Object: Altitude: 12.50 Azimuth: 262.86

Sun: Altitude: 33.65 Azimuth: 45.19

Moon: Altitude: 13.96 Azimuth: 330.65

Kislovodsk

Object: Altitude: -25.22 Azimuth: 214.31

Sun: Altitude: 45.02 Azimuth: 324.61

Moon: Altitude: -13.92 Azimuth: 283.78

Tavrida

Object: Altitude: -27.41 Azimuth: 205.51

Sun: Altitude: 40.33 Azimuth: 314.96

Moon: Altitude: -20.09 Azimuth: 277.90

SAAO

Object: Altitude: -69.64 Azimuth: 330.99

Sun: Altitude: 33.14 Azimuth: 238.87

Moon: Altitude: -7.29 Azimuth: 298.63

IAC

Object: Altitude: -39.96 Azimuth: 144.54

Sun: Altitude: 7.90 Azimuth: 269.50

Moon: Altitude: -61.17 Azimuth: 258.88

Argentina

Object: Altitude: -15.70 Azimuth: 97.20

Sun: Altitude: -40.46 Azimuth: 294.60

Moon: Altitude: -34.30 Azimuth: 26.12

Mexico

Object: Altitude: 33.81 Azimuth: 86.63

Sun: Altitude: -54.67 Azimuth: 184.93

Moon: Altitude: -31.95 Azimuth: 85.23

Ural

Object: Altitude: -8.17 Azimuth: 227.42

Sun: Altitude: 36.83 Azimuth: 351.00

Moon: Altitude: -7.87 Azimuth: 293.93

Vostryakovo

Object: Altitude: -16.79 Azimuth: 207.39

Sun: Altitude: 33.76 Azimuth: 324.51

Moon: Altitude: -19.04 Azimuth: 276.94

Gal. latitude: -3.876823 Gal. longitude: 51.172212

Dist. to Sun: 121.555865

Dist. to Moon: 65.770682

Moon coord.: (236.926387 d, -19.476793 d)

Sun coord.: (170.316528 d, 4.171772 d)

Lunar disk: 0.326664

Lunar phase: 110.283926

Lunar bright limb: 282.360866

No SN in this field

2021-09-12 07:35:45 (JD 2459469.816493)

Siderial time 9.539404 h

Ra 19:37:24.00 Dec 14:11:24.00
(294.350000d, 14.190000d)

Rise 2021-09-12 13:08:40

Transit 2021-09-12 20:39:08

Set 2021-09-12 04:13:32

Amur

Object: Altitude: 29.02 Azimuth: 283.27

Sun: Altitude: 20.41 Azimuth: 70.92

Moon: Altitude: 20.09 Azimuth: 355.94

Tunka

Object: Altitude: 13.68 Azimuth: 264.34

Sun: Altitude: 32.79 Azimuth: 47.22

Moon: Altitude: 14.48 Azimuth: 332.35

Kislovodsk

Object: Altitude: -24.43 Azimuth: 216.15

Sun: Altitude: 45.79 Azimuth: 327.09

Moon: Altitude: -12.65 Azimuth: 284.99

Tavrida

Object: Altitude: -26.81 Azimuth: 207.48

Sun: Altitude: 41.27 Azimuth: 317.15

Moon: Altitude: -18.81 Azimuth: 279.14

SAAO

Object: Altitude: -68.80 Azimuth: 326.33

Sun: Altitude: 34.51 Azimuth: 237.28

Moon: Altitude: -5.90 Azimuth: 297.58

IAC

Object: Altitude: -40.92 Azimuth: 146.63

Sun: Altitude: 9.58 Azimuth: 270.41

Moon: Altitude: -59.59 Azimuth: 260.30

Argentina

Object: Altitude: -17.31 Azimuth: 96.25

Sun: Altitude: -38.98 Azimuth: 293.06

Moon: Altitude: -34.94 Azimuth: 24.17

Mexico

Object: Altitude: 32.17 Azimuth: 87.67

Sun: Altitude: -54.49 Azimuth: 188.20

Moon: Altitude: -33.53 Azimuth: 86.08

Ural

Object: Altitude: -7.39 Azimuth: 229.12

Sun: Altitude: 36.97 Azimuth: 353.37

Moon: Altitude: -6.98 Azimuth: 295.43

Vostryakovo

Object: Altitude: -16.28 Azimuth: 209.25

Sun: Altitude: 34.37 Azimuth: 326.68

Moon: Altitude: -18.03 Azimuth: 278.42

Gal. latitude: -3.876823 Gal. longitude: 51.172212

Dist. to Sun: 121.552066

Dist. to Moon: 65.716243

Moon coord.: (237.002876 d, -19.499610 d)

Sun coord.: (170.321284 d, 4.169750 d)

Lunar disk: 0.327239

Lunar phase: 110.213718

Lunar bright limb: 282.337853

No SN in this field

2021-09-12 08:35:45 (JD 2459469.858160)

Siderial time 10.542142 h

Ra 19:37:24.00 Dec 14:11:24.00
(294.350000d, 14.190000d)

Rise 2021-09-12 13:08:40

Transit 2021-09-12 20:39:08

Set 2021-09-12 04:13:32

Amur

Object: Altitude: 38.02 Azimuth: 297.07

Sun: Altitude: 11.07 Azimuth: 83.09

Moon: Altitude: 19.40 Azimuth: 10.37

Tunka

Object: Altitude: 22.96 Azimuth: 276.20

Sun: Altitude: 25.22 Azimuth: 62.01

Moon: Altitude: 17.47 Azimuth: 346.16

Kislovodsk

Object: Altitude: -17.03 Azimuth: 229.60

Sun: Altitude: 49.88 Azimuth: 348.62

Moon: Altitude: -2.97 Azimuth: 294.65

Tavrida

Object: Altitude: -20.71 Azimuth: 221.97

Sun: Altitude: 47.11 Azimuth: 336.44

Moon: Altitude: -8.99 Azimuth: 288.85

SAAO

Object: Altitude: -59.42 Azimuth: 300.17

Sun: Altitude: 44.24 Azimuth: 222.50

Moon: Altitude: 5.36 Azimuth: 289.94

IAC

Object: Altitude: -46.35 Azimuth: 165.39

Sun: Altitude: 22.74 Azimuth: 277.84

Moon: Altitude: -47.00 Azimuth: 269.04

Argentina

Object: Altitude: -30.08 Azimuth: 88.52

Sun: Altitude: -26.83 Azimuth: 282.60

Moon: Altitude: -38.15 Azimuth: 7.69

Mexico

Object: Altitude: 19.30 Azimuth: 95.30

Sun: Altitude: -50.06 Azimuth: 211.70

Moon: Altitude: -45.97 Azimuth: 93.28

Ural

Object: Altitude: -0.65 Azimuth: 242.09

Sun: Altitude: 36.56 Azimuth: 12.07

Moon: Altitude: -0.44 Azimuth: 307.38

Vostryakovo

Object: Altitude: -11.22 Azimuth: 223.34

Sun: Altitude: 37.86 Azimuth: 344.73

Moon: Altitude: -10.23 Azimuth: 289.93

Gal. latitude: -3.876823 Gal. longitude: 51.172212

Dist. to Sun: 121.522204

Dist. to Moon: 65.289142

Moon coord.: (237.604790 d, -19.677820 d)

Sun coord.: (170.358667 d, 4.153854 d)

Lunar disk: 0.331765

Lunar phase: 109.661930

Lunar bright limb: 282.155385

No SN in this field

2025-03-19 12:14:25 (JD 2460754.010012)

Siderial time 2.567980 h

Ra 19:37:24.00 Dec 14:11:24.00
(294.350000d, 14.190000d)

Rise 2025-03-21 00:40:33

Transit 2025-03-20 08:14:56

Set 2025-03-20 15:45:24

Amur

Object: Altitude: -24.32 Azimuth: 194.95

Sun: Altitude: -24.36 Azimuth: 122.10

Moon: Altitude: -26.54 Azimuth: 275.61

Tunka

Object: Altitude: -23.39 Azimuth: 169.03

Sun: Altitude: -9.64 Azimuth: 101.66

Moon: Altitude: -41.64 Azimuth: 254.63

Kislovodsk

Object: Altitude: -3.40 Azimuth: 113.38

Sun: Altitude: 30.61 Azimuth: 54.57

Moon: Altitude: -68.58 Azimuth: 157.65

Tavrida

Object: Altitude: 2.65 Azimuth: 107.43

Sun: Altitude: 34.66 Azimuth: 45.64

Moon: Altitude: -64.60 Azimuth: 140.75

SAAO

Object: Altitude: -5.37 Azimuth: 103.41

Sun: Altitude: 51.52 Azimuth: 141.44

Moon: Altitude: -26.97 Azimuth: 31.39

IAC

Object: Altitude: 41.64 Azimuth: 83.91

Sun: Altitude: 58.04 Azimuth: 331.77

Moon: Altitude: -29.68 Azimuth: 77.55

Argentina

Object: Altitude: 43.93 Azimuth: 183.74

Sun: Altitude: 19.40 Azimuth: 258.00

Moon: Altitude: 37.36 Azimuth: 83.21

Mexico

Object: Altitude: 46.52 Azimuth: 282.65

Sun: Altitude: -15.92 Azimuth: 260.70

Moon: Altitude: 32.62 Azimuth: 20.07

Ural

Object: Altitude: -6.03 Azimuth: 128.02

Sun: Altitude: 14.61 Azimuth: 65.31

Moon: Altitude: -55.98 Azimuth: 193.69

Vostryakovo

Object: Altitude: 3.73 Azimuth: 109.75

Sun: Altitude: 25.43 Azimuth: 45.16

Moon: Altitude: -56.66 Azimuth: 157.21

Gal. latitude: -3.876823 Gal. longitude: 51.172212

Dist. to Sun: 65.501417

Dist. to Moon: 71.556839

Moon coord.: (232.140778 d, -23.558758 d)

Sun coord.: (358.891628 d, -0.480121 d)

Lunar disk: 0.773366

Lunar phase: 56.856835

Lunar bright limb: 107.121884

No SN in this field
Recent coverage and limits telegrams

 #######################################################################################
#######################################################################################

  ID = 5048
TYPE = 35
DAYS = 1


MASTER-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the FERMI GRB210912.31 (trigger No 653124492,19h 37m 24.00s , +14d 11m 24.0s, R=5.57) errorbox  33104 sec after notice time and 33347 sec after trigger time at 2021-09-12 16:43:55 UT, with upper limit up to  18.5 mag. Observations started at twilight.  The observations began at zenith distance = 26 deg. The sun  altitude  is -14.6 deg. 

MASTER-Tavrida robotic telescope  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the FERMI GRB210912.31 errorbox  43922 sec after notice time and 44166 sec after trigger time at 2021-09-12 19:44:13 UT, with upper limit up to  19.3 mag. The observations began at zenith distance = 34 deg. The sun  altitude  is -35.5 deg. 

MASTER-SAAO robotic telescope  located in South Africa (South African Astronomical Observatory) started inspect of the FERMI GRB210912.31 errorbox  45907 sec after notice time and 46151 sec after trigger time at 2021-09-12 20:17:18 UT, with upper limit up to  18.5 mag. The observations began at zenith distance = 52 deg. The sun  altitude  is -47.3 deg. 

The galactic latitude b = -4 deg., longitude l = 51 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1718336

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   33378 | 2021-09-12 16:43:55 |   MASTER-Kislovodsk | (19h 43m 31.87s , +18d 28m 39.5s) |   C |    60 | 16.4 |        
   33378 | 2021-09-12 16:43:55 |   MASTER-Kislovodsk | (19h 48m 16.06s , +18d 04m 09.4s) |   C |    60 | 16.3 |        
   33628 | 2021-09-12 16:48:05 |   MASTER-Kislovodsk | (19h 41m 05.91s , +20d 21m 52.7s) |   C |    60 | 16.3 |        
   33628 | 2021-09-12 16:48:05 |   MASTER-Kislovodsk | (19h 45m 53.81s , +19d 57m 19.9s) |   C |    60 | 15.5 |        
   33708 | 2021-09-12 16:49:25 |   MASTER-Kislovodsk | (19h 47m 07.26s , +16d 34m 45.7s) |   C |    60 | 16.5 |        
   33708 | 2021-09-12 16:49:25 |   MASTER-Kislovodsk | (19h 51m 48.08s , +16d 10m 15.5s) |   C |    60 | 16.7 |        
   38072 | 2021-09-12 18:02:09 |   MASTER-Kislovodsk | (19h 40m 36.66s , +18d 43m 31.5s) |   C |    60 | 17.0 |        
   38072 | 2021-09-12 18:02:09 |   MASTER-Kislovodsk | (19h 45m 12.98s , +18d 20m 41.1s) |   C |    60 | 16.0 |        
   38313 | 2021-09-12 18:06:10 |   MASTER-Kislovodsk | (19h 38m 13.48s , +20d 35m 43.5s) |   C |    60 | 13.9 |        
   38313 | 2021-09-12 18:06:10 |   MASTER-Kislovodsk | (19h 42m 53.55s , +20d 12m 47.6s) |   C |    60 | 13.2 |        
   38393 | 2021-09-12 18:07:30 |   MASTER-Kislovodsk | (19h 48m 53.22s , +16d 26m 28.4s) |   C |    60 | 13.3 |        
   40559 | 2021-09-12 18:43:36 |   MASTER-Kislovodsk | (19h 45m 22.32s , +18d 19m 26.8s) |   C |    60 | 16.3 |        
   40559 | 2021-09-12 18:43:36 |   MASTER-Kislovodsk | (19h 40m 44.37s , +18d 42m 16.4s) |   C |    60 | 16.9 |        
   40800 | 2021-09-12 18:47:37 |   MASTER-Kislovodsk | (19h 42m 54.69s , +20d 13m 56.3s) |   C |    60 | 14.9 |        
   40800 | 2021-09-12 18:47:37 |   MASTER-Kislovodsk | (19h 38m 13.15s , +20d 36m 46.1s) |   C |    60 | 15.7 |        
   40880 | 2021-09-12 18:48:57 |   MASTER-Kislovodsk | (19h 44m 22.75s , +16d 47m 23.9s) |   C |    60 | 17.4 |        
   40880 | 2021-09-12 18:48:57 |   MASTER-Kislovodsk | (19h 48m 56.37s , +16d 24m 34.1s) |   C |    60 | 17.1 |        
   41761 | 2021-09-12 19:03:38 |   MASTER-Kislovodsk | (19h 55m 56.13s , +09d 13m 01.4s) |   C |    60 | 17.7 |        
   43701 | 2021-09-12 19:35:58 |   MASTER-Kislovodsk | (19h 56m 06.21s , +09d 10m 57.4s) |   C |    60 | 17.9 |        
   44196 | 2021-09-12 19:44:13 |      MASTER-Tavrida | (19h 41m 46.68s , +18d 04m 12.5s) |   C |    60 | 16.8 |        
   44275 | 2021-09-12 19:45:32 |      MASTER-Tavrida | (19h 50m 05.32s , +18d 03m 11.9s) |   C |    60 | 15.7 |        
   44579 | 2021-09-12 19:50:36 |      MASTER-Tavrida | (19h 37m 49.59s , +16d 11m 08.5s) |   C |    60 | 17.4 |        
   44658 | 2021-09-12 19:51:55 |      MASTER-Tavrida | (19h 25m 40.84s , +18d 03m 02.2s) |   C |    60 | 18.8 |        
   44678 | 2021-09-12 19:52:15 |   MASTER-Kislovodsk | (19h 56m 00.28s , +09d 11m 34.6s) |   C |    60 | 18.1 |        
   44737 | 2021-09-12 19:53:14 |      MASTER-Tavrida | (19h 34m 12.04s , +18d 03m 14.7s) |   C |    60 | 18.3 |        
   45242 | 2021-09-12 20:01:39 |      MASTER-Tavrida | (19h 41m 40.29s , +18d 04m 41.2s) |   C |    60 | 17.7 |        
   45321 | 2021-09-12 20:02:58 |      MASTER-Tavrida | (19h 50m 10.79s , +18d 03m 41.8s) |   C |    60 | 17.4 |        
   45400 | 2021-09-12 20:04:17 |      MASTER-Tavrida | (19h 29m 28.37s , +16d 08m 28.2s) |   C |    60 | 18.3 |        
   45410 | 2021-09-12 20:04:27 |   MASTER-Kislovodsk | (19h 26m 37.70s , +20d 13m 04.8s) |   C |    60 | 17.8 |        
   45410 | 2021-09-12 20:04:27 |   MASTER-Kislovodsk | (19h 22m 05.12s , +20d 36m 00.8s) |   C |    60 | 18.5 |        
   45703 | 2021-09-12 20:09:20 |      MASTER-Tavrida | (19h 37m 49.82s , +16d 10m 25.2s) |   C |    60 | 17.9 |        
   45861 | 2021-09-12 20:11:58 |      MASTER-Tavrida | (19h 25m 40.95s , +18d 02m 15.8s) |   C |    60 | 18.9 |        
   45940 | 2021-09-12 20:13:17 |      MASTER-Tavrida | (19h 34m 11.35s , +18d 02m 44.2s) |   C |    60 | 18.7 |        
   46135 | 2021-09-12 20:16:57 |   MASTER-Kislovodsk | (19h 49m 39.23s , +16d 34m 16.3s) |   C |    10 | 16.3 |        
   46150 | 2021-09-12 20:16:57 |   MASTER-Kislovodsk | (19h 49m 39.23s , +16d 34m 16.3s) |   C |    40 | 16.8 |  Coadd 
   46135 | 2021-09-12 20:16:57 |   MASTER-Kislovodsk | (19h 45m 13.01s , +16d 57m 06.5s) |   C |    10 | 16.6 |        
   46150 | 2021-09-12 20:16:57 |   MASTER-Kislovodsk | (19h 45m 13.01s , +16d 57m 06.5s) |   C |    40 | 17.2 |  Coadd 
   46156 | 2021-09-12 20:17:18 |         MASTER-SAAO | (19h 49m 25.37s , +16d 29m 25.1s) |   C |    10 | 16.5 |        
   46165 | 2021-09-12 20:17:27 |   MASTER-Kislovodsk | (19h 49m 44.97s , +16d 34m 15.7s) |   C |    10 | 16.3 |        
   46165 | 2021-09-12 20:17:27 |   MASTER-Kislovodsk | (19h 45m 18.81s , +16d 57m 05.4s) |   C |    10 | 16.6 |        
   46191 | 2021-09-12 20:17:48 |         MASTER-SAAO | (19h 49m 25.42s , +16d 28m 07.3s) |   C |    20 | 16.8 |        
   46196 | 2021-09-12 20:17:53 |      MASTER-Tavrida | (19h 50m 20.84s , +16d 20m 44.3s) |   C |    20 | 17.4 |        
   46231 | 2021-09-12 20:17:53 |      MASTER-Tavrida | (19h 50m 20.84s , +16d 20m 44.3s) |   C |    90 | 17.9 |  Coadd 
   46200 | 2021-09-12 20:17:57 |   MASTER-Kislovodsk | (19h 49m 42.05s , +16d 36m 09.6s) |   C |    20 | 16.5 |        
   46200 | 2021-09-12 20:17:57 |   MASTER-Kislovodsk | (19h 45m 15.88s , +16d 58m 59.7s) |   C |    20 | 17.0 |        
   46240 | 2021-09-12 20:18:32 |      MASTER-Tavrida | (19h 50m 14.33s , +16d 19m 59.5s) |   C |    30 | 17.6 |        
   46245 | 2021-09-12 20:18:37 |   MASTER-Kislovodsk | (19h 49m 42.04s , +16d 34m 21.9s) |   C |    30 | 16.7 |        
   46290 | 2021-09-12 20:18:37 |   MASTER-Kislovodsk | (19h 49m 42.03s , +16d 34m 21.9s) |   C |   120 | 17.1 |  Coadd 
   46245 | 2021-09-12 20:18:37 |   MASTER-Kislovodsk | (19h 45m 15.97s , +16d 57m 11.2s) |   C |    30 | 17.2 |        
   46294 | 2021-09-12 20:19:21 |      MASTER-Tavrida | (19h 50m 13.57s , +16d 20m 57.1s) |   C |    40 | 17.7 |        
   46299 | 2021-09-12 20:19:26 |   MASTER-Kislovodsk | (19h 49m 44.16s , +16d 36m 03.7s) |   C |    40 | 16.8 |        
   46299 | 2021-09-12 20:19:26 |   MASTER-Kislovodsk | (19h 45m 18.08s , +16d 58m 52.4s) |   C |    40 | 17.3 |        
   46365 | 2021-09-12 20:20:27 |   MASTER-Kislovodsk | (19h 49m 38.04s , +16d 35m 08.7s) |   C |    50 | 16.8 |        
   46365 | 2021-09-12 20:20:27 |   MASTER-Kislovodsk | (19h 45m 12.07s , +16d 57m 56.5s) |   C |    50 | 17.3 |        
   46440 | 2021-09-12 20:21:37 |   MASTER-Kislovodsk | (19h 49m 39.13s , +16d 36m 06.2s) |   C |    60 | 16.9 |        
   46440 | 2021-09-12 20:21:37 |   MASTER-Kislovodsk | (19h 45m 13.18s , +16d 58m 53.4s) |   C |    60 | 17.4 |        
   46604 | 2021-09-12 20:24:21 |      MASTER-Tavrida | (19h 41m 45.76s , +18d 02m 56.2s) |   C |    60 | 17.9 |        
   46777 | 2021-09-12 20:26:39 |         MASTER-SAAO | (20h 06m 19.69s , +16d 02m 32.6s) |   C |   130 | 18.3 |        
   46947 | 2021-09-12 20:26:39 |         MASTER-SAAO | (20h 06m 19.71s , +16d 02m 32.6s) |   C |   470 | 18.5 |  Coadd 
   46784 | 2021-09-12 20:26:46 |      MASTER-Tavrida | (20h 07m 15.76s , +15d 53m 04.2s) |   C |   130 | 18.8 |        
   46949 | 2021-09-12 20:26:46 |      MASTER-Tavrida | (20h 07m 15.76s , +15d 53m 04.2s) |   C |   460 | 19.3 |  Coadd 
   46789 | 2021-09-12 20:26:51 |   MASTER-Kislovodsk | (20h 06m 34.72s , +16d 10m 10.2s) |   C |   130 | 17.6 |        
   46789 | 2021-09-12 20:26:51 |   MASTER-Kislovodsk | (20h 02m 09.33s , +16d 32m 56.7s) |   C |   130 | 18.0 |        
   46959 | 2021-09-12 20:26:51 |   MASTER-Kislovodsk | (20h 02m 09.33s , +16d 32m 56.8s) |   C |   470 | 18.5 |  Coadd 
   46943 | 2021-09-12 20:29:15 |      MASTER-Tavrida | (20h 07m 11.77s , +15d 54m 48.0s) |   C |   150 | 18.9 |        
   46955 | 2021-09-12 20:29:22 |         MASTER-SAAO | (20h 06m 14.70s , +16d 02m 02.4s) |   C |   160 | 17.9 |        
   46955 | 2021-09-12 20:29:22 |   MASTER-Kislovodsk | (20h 06m 34.76s , +16d 08m 18.6s) |   C |   160 | 17.6 |        
   46955 | 2021-09-12 20:29:22 |   MASTER-Kislovodsk | (20h 02m 09.54s , +16d 31m 04.3s) |   C |   160 | 18.0 |        
   47127 | 2021-09-12 20:32:04 |      MASTER-Tavrida | (20h 07m 11.70s , +15d 52m 57.1s) |   C |   180 | 18.8 |        
   47144 | 2021-09-12 20:32:21 |         MASTER-SAAO | (20h 06m 14.99s , +16d 03m 07.4s) |   C |   180 | 18.2 |        
   47145 | 2021-09-12 20:32:22 |   MASTER-Kislovodsk | (20h 06m 36.95s , +16d 09m 47.1s) |   C |   180 | 17.5 |        
   47145 | 2021-09-12 20:32:22 |   MASTER-Kislovodsk | (20h 02m 11.85s , +16d 32m 31.9s) |   C |   180 | 18.0 |        
   47326 | 2021-09-12 20:35:22 |      MASTER-Tavrida | (20h 07m 14.87s , +15d 54m 30.0s) |   C |   180 | 18.8 |        
   47344 | 2021-09-12 20:35:41 |         MASTER-SAAO | (20h 06m 21.07s , +16d 02m 12.5s) |   C |   180 | 18.2 |        
   47346 | 2021-09-12 20:35:43 |   MASTER-Kislovodsk | (20h 06m 31.84s , +16d 09m 07.7s) |   C |   180 | 17.5 |        
   47346 | 2021-09-12 20:35:43 |   MASTER-Kislovodsk | (20h 02m 07.10s , +16d 31m 51.8s) |   C |   180 | 18.1 |        
   47500 | 2021-09-12 20:39:17 |      MASTER-Tavrida | (19h 29m 28.59s , +16d 08m 14.6s) |   C |    60 | 18.4 |        
   47659 | 2021-09-12 20:41:56 |      MASTER-Tavrida | (19h 37m 54.80s , +16d 08m 13.4s) |   C |    60 | 17.9 |        
   47817 | 2021-09-12 20:44:34 |      MASTER-Tavrida | (19h 25m 46.97s , +18d 01m 29.7s) |   C |    60 | 18.5 |        
   47896 | 2021-09-12 20:45:53 |      MASTER-Tavrida | (19h 34m 08.90s , +18d 02m 59.7s) |   C |    60 | 18.4 |        
   47900 | 2021-09-12 20:45:57 |   MASTER-Kislovodsk | (19h 26m 39.43s , +20d 10m 23.0s) |   C |    60 | 17.1 |        
   47900 | 2021-09-12 20:45:57 |   MASTER-Kislovodsk | (19h 22m 11.96s , +20d 33m 09.0s) |   C |    60 | 18.0 |        
   47963 | 2021-09-12 20:47:00 |         MASTER-SAAO | (20h 00m 23.26s , +16d 18m 36.5s) |   C |    60 | 17.5 |        
   47980 | 2021-09-12 20:47:17 |   MASTER-Kislovodsk | (20h 05m 10.19s , +14d 53m 22.7s) |   C |    60 | 17.8 |        
   48060 | 2021-09-12 20:48:37 |   MASTER-Kislovodsk | (19h 53m 43.37s , +14d 29m 44.2s) |   C |    60 | 16.8 |        
   48060 | 2021-09-12 20:48:37 |   MASTER-Kislovodsk | (19h 49m 24.39s , +14d 52m 27.7s) |   C |    60 | 17.3 |        
   48124 | 2021-09-12 20:49:41 |         MASTER-SAAO | (19h 56m 53.17s , +18d 12m 15.0s) |   C |    60 | 17.1 |        
   48140 | 2021-09-12 20:49:57 |   MASTER-Kislovodsk | (19h 59m 49.14s , +12d 36m 50.8s) |   C |    60 | 16.8 |        
   48140 | 2021-09-12 20:49:57 |   MASTER-Kislovodsk | (19h 55m 32.68s , +12d 59m 32.2s) |   C |    60 | 17.6 |        
   48381 | 2021-09-12 20:53:58 |   MASTER-Kislovodsk | (19h 44m 19.28s , +12d 34m 47.1s) |   C |    60 | 16.4 |        
   48381 | 2021-09-12 20:53:58 |   MASTER-Kislovodsk | (19h 40m 04.30s , +12d 57m 22.5s) |   C |    60 | 17.1 |        
   48767 | 2021-09-12 21:00:24 |         MASTER-SAAO | (19h 54m 36.96s , +20d 06m 45.6s) |   C |    60 | 17.5 |        
   48869 | 2021-09-12 21:02:06 |   MASTER-Kislovodsk | (19h 51m 44.68s , +10d 41m 31.4s) |   C |    60 | 16.6 |        
   48869 | 2021-09-12 21:02:06 |   MASTER-Kislovodsk | (19h 47m 32.79s , +11d 04m 11.2s) |   C |    60 | 17.3 |        
   48927 | 2021-09-12 21:03:04 |         MASTER-SAAO | (20h 00m 23.66s , +16d 17m 36.9s) |   C |    60 | 17.6 |        
   48949 | 2021-09-12 21:03:26 |   MASTER-Kislovodsk | (20h 05m 05.57s , +14d 51m 33.2s) |   C |    60 | 17.8 |        
   49029 | 2021-09-12 21:04:46 |   MASTER-Kislovodsk | (19h 53m 47.83s , +14d 28m 53.4s) |   C |    60 | 16.7 |        
   49030 | 2021-09-12 21:04:46 |   MASTER-Kislovodsk | (19h 49m 30.70s , +14d 51m 38.3s) |   C |    60 | 17.2 |        
   49086 | 2021-09-12 21:05:43 |         MASTER-SAAO | (19h 56m 49.05s , +18d 12m 08.2s) |   C |    60 | 17.2 |        
   49110 | 2021-09-12 21:06:07 |   MASTER-Kislovodsk | (19h 59m 51.84s , +12d 36m 23.2s) |   C |    60 | 16.7 |        
   49110 | 2021-09-12 21:06:07 |   MASTER-Kislovodsk | (19h 55m 37.16s , +12d 59m 07.4s) |   C |    60 | 17.5 |        
   49351 | 2021-09-12 21:10:07 |   MASTER-Kislovodsk | (19h 44m 13.69s , +12d 35m 10.3s) |   C |    60 | 16.3 |        
   49351 | 2021-09-12 21:10:08 |   MASTER-Kislovodsk | (19h 40m 00.62s , +12d 57m 49.1s) |   C |    60 | 17.0 |        
   49751 | 2021-09-12 21:16:48 |   MASTER-Kislovodsk | (19h 33m 03.01s , +16d 23m 21.0s) |   C |    60 | 16.7 |        
   49751 | 2021-09-12 21:16:48 |   MASTER-Kislovodsk | (19h 28m 45.46s , +16d 45m 59.4s) |   C |    60 | 17.6 |        
   49831 | 2021-09-12 21:18:08 |   MASTER-Kislovodsk | (19h 51m 41.70s , +10d 40m 37.3s) |   C |    60 | 16.6 |        
   49831 | 2021-09-12 21:18:08 |   MASTER-Kislovodsk | (19h 47m 31.21s , +11d 03m 12.1s) |   C |    60 | 17.3 |        
   49912 | 2021-09-12 21:19:29 |   MASTER-Kislovodsk | (20h 05m 13.92s , +14d 53m 08.2s) |   C |    60 | 17.8 |        
   49992 | 2021-09-12 21:20:49 |   MASTER-Kislovodsk | (19h 53m 42.68s , +14d 29m 07.5s) |   C |    60 | 16.8 |        
   49992 | 2021-09-12 21:20:49 |   MASTER-Kislovodsk | (19h 49m 26.97s , +14d 51m 46.4s) |   C |    60 | 17.2 |        
   50072 | 2021-09-12 21:22:09 |   MASTER-Kislovodsk | (19h 59m 47.51s , +12d 36m 14.4s) |   C |    60 | 16.8 |        
   50072 | 2021-09-12 21:22:09 |   MASTER-Kislovodsk | (19h 55m 34.14s , +12d 58m 52.0s) |   C |    60 | 17.6 |        
   50312 | 2021-09-12 21:26:09 |   MASTER-Kislovodsk | (19h 44m 19.71s , +12d 33m 52.7s) |   C |    60 | 16.4 |        
   50312 | 2021-09-12 21:26:09 |   MASTER-Kislovodsk | (19h 40m 07.99s , +12d 56m 25.1s) |   C |    60 | 17.0 |        
   50681 | 2021-09-12 21:32:18 |      MASTER-Tavrida | (20h 03m 33.58s , +10d 25m 21.9s) |   C |    60 | 18.2 |        
   50713 | 2021-09-12 21:32:50 |   MASTER-Kislovodsk | (19h 33m 00.39s , +16d 23m 26.8s) |   C |    60 | 16.8 |        
   50713 | 2021-09-12 21:32:50 |   MASTER-Kislovodsk | (19h 28m 44.51s , +16d 45m 59.2s) |   C |    60 | 17.6 |        
   50793 | 2021-09-12 21:34:10 |   MASTER-Kislovodsk | (19h 51m 43.25s , +10d 40m 49.7s) |   C |    60 | 16.7 |        
   50793 | 2021-09-12 21:34:10 |   MASTER-Kislovodsk | (19h 47m 34.37s , +11d 03m 21.5s) |   C |    60 | 17.3 |        
   50873 | 2021-09-12 21:35:30 |   MASTER-Kislovodsk | (19h 29m 09.19s , +18d 15m 15.1s) |   C |    60 | 17.1 |        
   50873 | 2021-09-12 21:35:30 |   MASTER-Kislovodsk | (19h 24m 50.92s , +18d 37m 48.6s) |   C |    60 | 18.0 |        
   50953 | 2021-09-12 21:36:50 |   MASTER-Kislovodsk | (19h 38m 07.09s , +14d 27m 48.2s) |   C |    60 | 16.6 |        
   50953 | 2021-09-12 21:36:50 |   MASTER-Kislovodsk | (19h 33m 54.57s , +14d 50m 20.6s) |   C |    60 | 17.4 |        
   51677 | 2021-09-12 21:48:54 |      MASTER-Tavrida | (20h 03m 41.65s , +10d 23m 50.6s) |   C |    60 | 18.3 |        
   51794 | 2021-09-12 21:50:51 |         MASTER-SAAO | (19h 54m 33.17s , +20d 08m 18.3s) |   C |    60 | 16.5 |        
   51825 | 2021-09-12 21:51:22 |   MASTER-Kislovodsk | (19h 32m 58.62s , +16d 21m 02.1s) |   C |    60 | 16.9 |        
   51825 | 2021-09-12 21:51:22 |   MASTER-Kislovodsk | (19h 28m 44.84s , +16d 43m 22.3s) |   C |    60 | 17.6 |        
   51921 | 2021-09-12 21:52:58 |   MASTER-Kislovodsk | (19h 29m 15.08s , +18d 15m 10.4s) |   C |    60 | 17.1 |        
   51921 | 2021-09-12 21:52:58 |   MASTER-Kislovodsk | (19h 24m 59.29s , +18d 37m 31.5s) |   C |    60 | 17.9 |        
   51953 | 2021-09-12 21:53:30 |         MASTER-SAAO | (20h 00m 17.43s , +16d 19m 30.1s) |   C |    60 | 17.4 |        
   52013 | 2021-09-12 21:54:30 |   MASTER-Kislovodsk | (19h 38m 01.81s , +14d 28m 54.9s) |   C |    60 | 16.7 |        
   52013 | 2021-09-12 21:54:30 |   MASTER-Kislovodsk | (19h 33m 51.84s , +14d 51m 14.3s) |   C |    60 | 17.4 |        
   52112 | 2021-09-12 21:56:09 |         MASTER-SAAO | (19h 56m 44.34s , +18d 13m 48.5s) |   C |    60 | 16.4 |        
   52414 | 2021-09-12 22:01:11 |   MASTER-Kislovodsk | (20h 03m 03.76s , +11d 02m 48.8s) |   C |    60 | 17.3 |        
   52895 | 2021-09-12 22:09:12 |   MASTER-Kislovodsk | (19h 29m 05.71s , +18d 15m 33.9s) |   C |    60 | 17.1 |        
   52895 | 2021-09-12 22:09:12 |   MASTER-Kislovodsk | (19h 24m 54.33s , +18d 37m 46.3s) |   C |    60 | 17.9 |        
   52975 | 2021-09-12 22:10:32 |      MASTER-Tavrida | (20h 05m 54.89s , +14d 10m 11.6s) |   C |    60 | 18.5 |        
   52975 | 2021-09-12 22:10:32 |   MASTER-Kislovodsk | (19h 37m 54.42s , +14d 28m 44.4s) |   C |    60 | 16.7 |        
   52975 | 2021-09-12 22:10:32 |   MASTER-Kislovodsk | (19h 33m 49.10s , +14d 50m 56.5s) |   C |    60 | 17.3 |        
   53133 | 2021-09-12 22:13:10 |      MASTER-Tavrida | (19h 57m 44.78s , +17d 58m 28.1s) |   C |    60 | 18.0 |        
   53376 | 2021-09-12 22:17:12 |   MASTER-Kislovodsk | (20h 03m 02.31s , +11d 01m 36.6s) |   C |    60 | 17.3 |        
   53975 | 2021-09-12 22:27:12 |      MASTER-Tavrida | (20h 05m 55.92s , +14d 11m 38.4s) |   C |    60 | 18.4 |        
   54133 | 2021-09-12 22:29:50 |      MASTER-Tavrida | (19h 57m 42.39s , +17d 57m 37.0s) |   C |    60 | 17.9 |        
   54338 | 2021-09-12 22:33:15 |   MASTER-Kislovodsk | (20h 03m 07.81s , +11d 02m 02.8s) |   C |    60 | 17.3 |        
   54854 | 2021-09-12 22:41:51 |      MASTER-Tavrida | (20h 01m 17.76s , +16d 04m 10.7s) |   C |    60 | 18.2 |        
   55012 | 2021-09-12 22:44:29 |      MASTER-Tavrida | (20h 06m 01.60s , +14d 09m 18.1s) |   C |    60 | 18.2 |        
   55170 | 2021-09-12 22:47:07 |      MASTER-Tavrida | (19h 57m 46.08s , +17d 57m 08.1s) |   C |    60 | 17.7 |        
   56425 | 2021-09-12 23:08:02 |      MASTER-Tavrida | (19h 34m 37.02s , +14d 10m 23.1s) |   C |    60 | 12.5 |        
   56504 | 2021-09-12 23:09:21 |      MASTER-Tavrida | (19h 42m 52.72s , +14d 08m 47.0s) |   C |    60 | 13.9 |        
   56741 | 2021-09-12 23:13:18 |      MASTER-Tavrida | (19h 55m 30.29s , +19d 52m 30.9s) |   C |    60 | 17.7 |        
   56820 | 2021-09-12 23:14:37 |      MASTER-Tavrida | (19h 50m 16.38s , +14d 08m 13.2s) |   C |    60 | 16.9 |        
   56899 | 2021-09-12 23:15:56 |      MASTER-Tavrida | (19h 58m 38.12s , +14d 08m 12.0s) |   C |    60 | 17.4 |        
   57517 | 2021-09-12 23:26:14 |      MASTER-Tavrida | (19h 34m 38.70s , +14d 08m 19.5s) |   C |    60 | 13.1 |        
   57597 | 2021-09-12 23:27:34 |      MASTER-Tavrida | (19h 42m 51.28s , +14d 09m 31.2s) |   C |    60 | 17.0 |        
   57676 | 2021-09-12 23:28:53 |      MASTER-Tavrida | (19h 55m 31.59s , +19d 50m 18.6s) |   C |    60 | 17.4 |        
   57755 | 2021-09-12 23:30:12 |      MASTER-Tavrida | (19h 50m 21.36s , +14d 09m 22.5s) |   C |    60 | 17.2 |        
   57834 | 2021-09-12 23:31:31 |      MASTER-Tavrida | (19h 58m 29.58s , +14d 08m 45.6s) |   C |    60 | 12.8 |        
   58582 | 2021-09-12 23:43:59 |      MASTER-Tavrida | (19h 40m 43.66s , +12d 13m 31.8s) |   C |    60 | 13.4 |        
   58678 | 2021-09-12 23:45:35 |      MASTER-Tavrida | (19h 49m 02.94s , +12d 13m 49.9s) |   C |    60 | 14.8 |        
   58757 | 2021-09-12 23:46:54 |      MASTER-Tavrida | (19h 34m 32.35s , +14d 09m 38.1s) |   C |    60 | 17.2 |        
   58836 | 2021-09-12 23:48:13 |      MASTER-Tavrida | (19h 42m 48.91s , +14d 07m 41.9s) |   C |    60 | 17.0 |        
   58915 | 2021-09-12 23:49:32 |      MASTER-Tavrida | (19h 50m 17.74s , +14d 09m 19.5s) |   C |    60 | 17.4 |        
   58994 | 2021-09-12 23:50:51 |      MASTER-Tavrida | (19h 58m 28.23s , +14d 08m 20.4s) |   C |    60 | 17.6 |        
   59915 | 2021-09-13 00:06:12 |      MASTER-Tavrida | (19h 53m 44.54s , +16d 03m 01.6s) |   C |    60 | 17.4 |        
   59994 | 2021-09-13 00:07:31 |      MASTER-Tavrida | (19h 56m 16.39s , +12d 15m 06.4s) |   C |    60 | 15.6 |        
   60083 | 2021-09-13 00:08:59 |      MASTER-Tavrida | (20h 04m 35.43s , +12d 13m 56.2s) |   C |    60 | 14.2 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.



#######################################################################################
#######################################################################################

  ID = 5037
TYPE = 35
DAYS = 0


MASTER-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the FERMI GRB210912.31 (trigger No 653124492,19h 37m 24.00s , +14d 11m 24.0s, R=5.57) errorbox  33104 sec after notice time and 33347 sec after trigger time at 2021-09-12 16:43:55 UT, with upper limit up to  16.7 mag. Observations started at twilight.  The observations began at zenith distance = 26 deg. The sun  altitude  is -14.6 deg. 

The galactic latitude b = -4 deg., longitude l = 51 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1718336

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   33378 | 2021-09-12 16:43:55 |   MASTER-Kislovodsk | (19h 43m 31.87s , +18d 28m 39.5s) |   C |    60 | 16.4 |        
   33378 | 2021-09-12 16:43:55 |   MASTER-Kislovodsk | (19h 48m 16.06s , +18d 04m 09.4s) |   C |    60 | 16.3 |        
   33628 | 2021-09-12 16:48:05 |   MASTER-Kislovodsk | (19h 41m 05.91s , +20d 21m 52.7s) |   C |    60 | 16.3 |        
   33628 | 2021-09-12 16:48:05 |   MASTER-Kislovodsk | (19h 45m 53.81s , +19d 57m 19.9s) |   C |    60 | 15.5 |        
   33708 | 2021-09-12 16:49:25 |   MASTER-Kislovodsk | (19h 47m 07.26s , +16d 34m 45.7s) |   C |    60 | 16.5 |        
   33708 | 2021-09-12 16:49:25 |   MASTER-Kislovodsk | (19h 51m 48.08s , +16d 10m 15.5s) |   C |    60 | 16.7 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.



#######################################################################################
#######################################################################################

  ID = 5036
TYPE = 35
DAYS = 0


MASTER-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the FERMI GRB210912.31 (trigger No 653124492,19h 37m 24.00s , +14d 11m 24.0s, R=5.57) errorbox  33104 sec after notice time and 33347 sec after trigger time at 2021-09-12 16:43:55 UT, with upper limit up to  16.7 mag. Observations started at twilight.  The observations began at zenith distance = 26 deg. The sun  altitude  is -14.6 deg. 

The galactic latitude b = -4 deg., longitude l = 51 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1718336

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   33378 | 2021-09-12 16:43:55 |   MASTER-Kislovodsk | (19h 43m 31.87s , +18d 28m 39.5s) |   C |    60 | 16.4 |        
   33378 | 2021-09-12 16:43:55 |   MASTER-Kislovodsk | (19h 48m 16.06s , +18d 04m 09.4s) |   C |    60 | 16.3 |        
   33628 | 2021-09-12 16:48:05 |   MASTER-Kislovodsk | (19h 41m 05.91s , +20d 21m 52.7s) |   C |    60 | 16.3 |        
   33628 | 2021-09-12 16:48:05 |   MASTER-Kislovodsk | (19h 45m 53.81s , +19d 57m 19.9s) |   C |    60 | 15.5 |        
   33708 | 2021-09-12 16:49:25 |   MASTER-Kislovodsk | (19h 47m 07.26s , +16d 34m 45.7s) |   C |    60 | 16.5 |        
   33708 | 2021-09-12 16:49:25 |   MASTER-Kislovodsk | (19h 51m 48.08s , +16d 10m 15.5s) |   C |    60 | 16.7 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.



#######################################################################################
#######################################################################################

  ID = 5035
TYPE = 34
DAYS = 0


MASTER-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the FERMI GRB210912.31 (trigger No 653124492,19h 37m 24.00s , +14d 11m 24.0s, R=5.57) errorbox  33104 sec after notice time and 33347 sec after trigger time at 2021-09-12 16:43:55 UT, with upper limit up to  16.7 mag. Observations started at twilight.  The observations began at zenith distance = 26 deg. The sun  altitude  is -14.6 deg. 

The galactic latitude b = -4 deg., longitude l = 51 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1718336

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   33378 | 2021-09-12 16:43:55 |   MASTER-Kislovodsk | (19h 43m 31.87s , +18d 28m 39.5s) |   C |    60 | 16.4 |        
   33378 | 2021-09-12 16:43:55 |   MASTER-Kislovodsk | (19h 48m 16.06s , +18d 04m 09.4s) |   C |    60 | 16.3 |        
   33628 | 2021-09-12 16:48:05 |   MASTER-Kislovodsk | (19h 41m 05.91s , +20d 21m 52.7s) |   C |    60 | 16.3 |        
   33628 | 2021-09-12 16:48:05 |   MASTER-Kislovodsk | (19h 45m 53.81s , +19d 57m 19.9s) |   C |    60 | 15.5 |        
   33708 | 2021-09-12 16:49:25 |   MASTER-Kislovodsk | (19h 47m 07.26s , +16d 34m 45.7s) |   C |    60 | 16.5 |        
   33708 | 2021-09-12 16:49:25 |   MASTER-Kislovodsk | (19h 51m 48.08s , +16d 10m 15.5s) |   C |    60 | 16.7 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.

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