MASTER Net MASTER Database: GRB210520.80 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 GRB210520.80
Trignum 643230427
Trigger time 2021-05-20 19:07:02.94
Notice time 2021-05-20 20:40:52.20166
Coord, eb (09h 06m 12.00s , -68d 37m 48.0s) , 2.29
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You are viewing outdated information, relevant error box is here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
2268053 2023-09-09 20:21:44.025215 09h 06m 12.00s -68d 37m 48.0s FERMI 2.29 retraction 643230427 1 4044 retraction
1617942 2021-05-20 20:40:52.20166 09h 06m 12.00s -68d 37m 48.0s FERMI 2.29 alert 643230427 2 115 alert
1617807 2021-05-20 19:09:10.723599 09h 56m 50.40s -68d 03m 36.0s FERMI 2.29 alert 643230427 2 112 alert
1617797 2021-05-20 19:08:42.033164 07h 08m 43.92s -62d 40m 58.8s FERMI 12.85 alert 643230427 2 111 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

2021-05-20 19:07:02 (JD 2459355.296551)

Siderial time 13.535708 h

Ra 09:06:12.00 Dec -68:37:48.00
(136.550000d, -68.630000d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: -68.41 Azimuth: 23.40

Sun: Altitude: -4.37 Azimuth: 230.84

Moon: Altitude: -12.73 Azimuth: 127.15

Tunka

Object: Altitude: -61.94 Azimuth: 35.19

Sun: Altitude: -13.17 Azimuth: 209.78

Moon: Altitude: 1.52 Azimuth: 107.48

Kislovodsk

Object: Altitude: -34.05 Azimuth: 24.63

Sun: Altitude: -20.65 Azimuth: 150.33

Moon: Altitude: 41.65 Azimuth: 62.05

Tavrida

Object: Altitude: -32.51 Azimuth: 22.62

Sun: Altitude: -16.48 Azimuth: 142.86

Moon: Altitude: 46.23 Azimuth: 52.12

SAAO

Object: Altitude: 44.25 Azimuth: 22.82

Sun: Altitude: -42.86 Azimuth: 88.07

Moon: Altitude: 41.48 Azimuth: 152.49

IAC

Object: Altitude: -7.36 Azimuth: 4.51

Sun: Altitude: 8.19 Azimuth: 108.46

Moon: Altitude: 67.44 Azimuth: 313.21

Argentina

Object: Altitude: 46.58 Azimuth: 339.88

Sun: Altitude: 26.28 Azimuth: 139.20

Moon: Altitude: 10.57 Azimuth: 248.72

Mexico

Object: Altitude: -25.74 Azimuth: 336.42

Sun: Altitude: 78.81 Azimuth: 348.02

Moon: Altitude: -10.77 Azimuth: 248.91

Ural

Object: Altitude: -50.88 Azimuth: 35.26

Sun: Altitude: -12.16 Azimuth: 167.97

Moon: Altitude: 26.35 Azimuth: 70.10

Vostryakovo

Object: Altitude: -43.19 Azimuth: 27.32

Sun: Altitude: -9.11 Azimuth: 147.62

Moon: Altitude: 37.57 Azimuth: 49.03

Gal. latitude: -14.255896 Gal. longitude: 284.905473

Dist. to Sun: 104.766893

Dist. to Moon: 83.128274

Moon coord.: (165.516417 d, 11.916429 d)

Sun coord.: (57.490972 d, 20.087438 d)

Lunar disk: 0.607822

Lunar phase: 77.546693

Lunar bright limb: 293.932168

No SN in this field

2021-05-20 20:40:52 (JD 2459355.361713)

Siderial time 15.103879 h

Ra 09:06:12.00 Dec -68:37:48.00
(136.550000d, -68.630000d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: -71.69 Azimuth: 0.15

Sun: Altitude: 8.55 Azimuth: 248.71

Moon: Altitude: -22.82 Azimuth: 147.98

Tunka

Object: Altitude: -69.53 Azimuth: 25.65

Sun: Altitude: -3.87 Azimuth: 229.98

Moon: Altitude: -11.27 Azimuth: 125.74

Kislovodsk

Object: Altitude: -41.80 Azimuth: 29.14

Sun: Altitude: -25.91 Azimuth: 173.64

Moon: Altitude: 25.88 Azimuth: 81.04

Tavrida

Object: Altitude: -39.73 Azimuth: 28.22

Sun: Altitude: -23.81 Azimuth: 165.01

Moon: Altitude: 31.61 Azimuth: 73.85

SAAO

Object: Altitude: 35.99 Azimuth: 25.54

Sun: Altitude: -62.32 Azimuth: 70.56

Moon: Altitude: 29.58 Azimuth: 129.28

IAC

Object: Altitude: -10.46 Azimuth: 12.54

Sun: Altitude: -10.65 Azimuth: 119.90

Moon: Altitude: 72.33 Azimuth: 20.00

Argentina

Object: Altitude: 51.91 Azimuth: 350.09

Sun: Altitude: 11.12 Azimuth: 122.28

Moon: Altitude: 27.71 Azimuth: 233.68

Mexico

Object: Altitude: -18.36 Azimuth: 341.00

Sun: Altitude: 68.18 Azimuth: 64.88

Moon: Altitude: 7.80 Azimuth: 261.15

Ural

Object: Altitude: -58.80 Azimuth: 40.73

Sun: Altitude: -12.32 Azimuth: 190.50

Moon: Altitude: 13.96 Azimuth: 89.80

Vostryakovo

Object: Altitude: -50.09 Azimuth: 34.61

Sun: Altitude: -13.96 Azimuth: 169.55

Moon: Altitude: 26.10 Azimuth: 71.55

Gal. latitude: -14.255896 Gal. longitude: 284.905473

Dist. to Sun: 104.756683

Dist. to Moon: 82.935348

Moon coord.: (166.347622 d, 11.571284 d)

Sun coord.: (57.556187 d, 20.100835 d)

Lunar disk: 0.614804

Lunar phase: 76.725969

Lunar bright limb: 294.098022

No SN in this field

2021-05-20 21:40:52 (JD 2459355.403380)

Siderial time 16.106616 h

Ra 09:06:12.00 Dec -68:37:48.00
(136.550000d, -68.630000d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: -70.31 Azimuth: 343.84

Sun: Altitude: 17.76 Azimuth: 259.67

Moon: Altitude: -26.88 Azimuth: 163.01

Tunka

Object: Altitude: -72.58 Azimuth: 11.59

Sun: Altitude: 3.81 Azimuth: 241.79

Moon: Altitude: -18.11 Azimuth: 138.64

Kislovodsk

Object: Altitude: -47.20 Azimuth: 30.27

Sun: Altitude: -25.62 Azimuth: 189.28

Moon: Altitude: 15.28 Azimuth: 91.19

Tavrida

Object: Altitude: -44.97 Azimuth: 30.32

Sun: Altitude: -25.16 Azimuth: 180.41

Moon: Altitude: 21.34 Azimuth: 84.86

SAAO

Object: Altitude: 30.54 Azimuth: 25.02

Sun: Altitude: -73.22 Azimuth: 46.14

Moon: Altitude: 19.54 Azimuth: 118.18

IAC

Object: Altitude: -13.84 Azimuth: 16.94

Sun: Altitude: -21.53 Azimuth: 129.22

Moon: Altitude: 64.34 Azimuth: 52.79

Argentina

Object: Altitude: 53.16 Azimuth: 358.85

Sun: Altitude: -0.14 Azimuth: 113.77

Moon: Altitude: 36.96 Azimuth: 220.86

Mexico

Object: Altitude: -14.59 Azimuth: 345.13

Sun: Altitude: 55.91 Azimuth: 80.00

Moon: Altitude: 20.07 Azimuth: 268.59

Ural

Object: Altitude: -64.23 Azimuth: 42.04

Sun: Altitude: -9.85 Azimuth: 204.62

Moon: Altitude: 5.93 Azimuth: 101.73

Vostryakovo

Object: Altitude: -55.16 Azimuth: 37.99

Sun: Altitude: -14.42 Azimuth: 184.06

Moon: Altitude: 17.87 Azimuth: 84.08

Gal. latitude: -14.255896 Gal. longitude: 284.905473

Dist. to Sun: 104.750146

Dist. to Moon: 82.812618

Moon coord.: (166.878945 d, 11.348964 d)

Sun coord.: (57.597892 d, 20.109389 d)

Lunar disk: 0.619265

Lunar phase: 76.200210

Lunar bright limb: 294.201571

No SN in this field

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

Siderial time 2.567980 h

Ra 09:06:12.00 Dec -68:37:48.00
(136.550000d, -68.630000d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: -29.10 Azimuth: 356.60

Sun: Altitude: -24.36 Azimuth: 122.10

Moon: Altitude: -26.54 Azimuth: 275.61

Tunka

Object: Altitude: -32.83 Azimuth: 346.50

Sun: Altitude: -9.64 Azimuth: 101.66

Moon: Altitude: -41.64 Azimuth: 254.63

Kislovodsk

Object: Altitude: -41.17 Azimuth: 331.10

Sun: Altitude: 30.61 Azimuth: 54.57

Moon: Altitude: -68.58 Azimuth: 157.65

Tavrida

Object: Altitude: -45.04 Azimuth: 329.66

Sun: Altitude: 34.66 Azimuth: 45.64

Moon: Altitude: -64.60 Azimuth: 140.75

SAAO

Object: Altitude: 21.68 Azimuth: 339.15

Sun: Altitude: 51.52 Azimuth: 141.44

Moon: Altitude: -26.97 Azimuth: 31.39

IAC

Object: Altitude: -46.48 Azimuth: 345.69

Sun: Altitude: 58.04 Azimuth: 331.77

Moon: Altitude: -29.68 Azimuth: 77.55

Argentina

Object: Altitude: 12.12 Azimuth: 9.05

Sun: Altitude: 19.40 Azimuth: 258.00

Moon: Altitude: 37.36 Azimuth: 83.21

Mexico

Object: Altitude: -37.38 Azimuth: 24.77

Sun: Altitude: -15.92 Azimuth: 260.70

Moon: Altitude: 32.62 Azimuth: 20.07

Ural

Object: Altitude: -47.20 Azimuth: 328.63

Sun: Altitude: 14.61 Azimuth: 65.31

Moon: Altitude: -55.98 Azimuth: 193.69

Vostryakovo

Object: Altitude: -52.62 Azimuth: 323.52

Sun: Altitude: 25.43 Azimuth: 45.16

Moon: Altitude: -56.66 Azimuth: 157.21

Gal. latitude: -14.255896 Gal. longitude: 284.905473

Dist. to Sun: 105.160417

Dist. to Moon: 70.143322

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 = 4303
TYPE = 35
DAYS = 2


MASTER-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) started inspect of the FERMI GRB 210520A ( Fermi GBM team, GCN 30059) errorbox  12138 sec after notice time and 12187 sec after trigger time at 2021-05-20 22:30:10 UT, with upper limit up to  18.1 mag. Observations started at twilight.  The observations began at zenith distance = 39 deg. The sun  altitude  is -10.0 deg. 

MASTER-SAAO robotic telescope  located in South Africa (South African Astronomical Observatory) started inspect of the FERMI GRB 210520A errorbox  1 days 76587 sec after notice time and 1 days 76635 sec after trigger time at 2021-05-22 16:24:18 UT, with upper limit up to  18.8 mag. Observations started at twilight.  The observations began at zenith distance = 35 deg. The sun  altitude  is -8.4 deg. 

The galactic latitude b = -14 deg., longitude l = 285 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1617933

We obtain a following upper limits.  

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

   12218 | 2021-05-20 22:30:10 |         MASTER-OAFA | (09h 02m 19.62s , -69d 42m 16.2s) |   C |    60 | 16.8 |        
   12297 | 2021-05-20 22:31:29 |         MASTER-OAFA | (09h 24m 33.57s , -69d 42m 48.7s) |   C |    60 | 17.0 |        
   12376 | 2021-05-20 22:32:49 |         MASTER-OAFA | (08h 58m 19.03s , -67d 47m 42.0s) |   C |    60 | 17.0 |        
   12456 | 2021-05-20 22:34:08 |         MASTER-OAFA | (09h 18m 52.88s , -67d 48m 52.0s) |   C |    60 | 17.1 |        
   12536 | 2021-05-20 22:35:28 |         MASTER-OAFA | (08h 19m 48.16s , -69d 43m 36.4s) |   C |    60 | 17.2 |        
   12615 | 2021-05-20 22:36:48 |         MASTER-OAFA | (08h 42m 08.16s , -69d 42m 03.1s) |   C |    60 | 17.3 |        
   12694 | 2021-05-20 22:38:07 |         MASTER-OAFA | (08h 55m 26.14s , -65d 55m 38.1s) |   C |    60 | 17.2 |        
   12774 | 2021-05-20 22:39:26 |         MASTER-OAFA | (09h 14m 37.75s , -65d 55m 00.7s) |   C |    60 | 17.4 |        
   12934 | 2021-05-20 22:42:07 |         MASTER-OAFA | (08h 39m 52.51s , -67d 48m 36.6s) |   C |    60 | 17.6 |        
   13014 | 2021-05-20 22:43:27 |         MASTER-OAFA | (09h 37m 20.48s , -67d 46m 44.0s) |   C |    60 | 17.7 |        
   13173 | 2021-05-20 22:46:05 |         MASTER-OAFA | (09h 02m 13.32s , -69d 43m 37.7s) |   C |    60 | 17.7 |        
   13252 | 2021-05-20 22:47:25 |         MASTER-OAFA | (09h 24m 39.53s , -69d 43m 07.0s) |   C |    60 | 17.9 |        
   13332 | 2021-05-20 22:48:44 |         MASTER-OAFA | (08h 58m 19.08s , -67d 47m 59.9s) |   C |    60 | 17.8 |        
   13411 | 2021-05-20 22:50:04 |         MASTER-OAFA | (09h 18m 52.85s , -67d 48m 45.9s) |   C |    60 | 17.9 |        
   13491 | 2021-05-20 22:51:23 |         MASTER-OAFA | (08h 19m 53.85s , -69d 43m 07.9s) |   C |    60 | 18.0 |        
   13570 | 2021-05-20 22:52:42 |         MASTER-OAFA | (08h 42m 07.95s , -69d 43m 08.3s) |   C |    60 | 18.0 |        
   13650 | 2021-05-20 22:54:02 |         MASTER-OAFA | (08h 55m 26.34s , -65d 53m 42.8s) |   C |    60 | 17.8 |        
   13729 | 2021-05-20 22:55:21 |         MASTER-OAFA | (09h 14m 36.82s , -65d 54m 14.8s) |   C |    60 | 17.9 |        
   13888 | 2021-05-20 22:58:00 |         MASTER-OAFA | (08h 39m 52.81s , -67d 50m 04.7s) |   C |    60 | 17.9 |        
   13968 | 2021-05-20 22:59:20 |         MASTER-OAFA | (09h 37m 22.44s , -67d 47m 05.3s) |   C |    60 | 17.9 |        
   14133 | 2021-05-20 23:02:05 |         MASTER-OAFA | (09h 02m 19.35s , -69d 41m 45.5s) |   C |    60 | 17.9 |        
   14213 | 2021-05-20 23:03:25 |         MASTER-OAFA | (09h 24m 33.49s , -69d 42m 09.2s) |   C |    60 | 18.0 |        
   14292 | 2021-05-20 23:04:45 |         MASTER-OAFA | (08h 58m 16.51s , -67d 47m 43.7s) |   C |    60 | 17.9 |        
   14372 | 2021-05-20 23:06:04 |         MASTER-OAFA | (09h 18m 56.26s , -67d 48m 13.8s) |   C |    60 | 18.0 |        
   14451 | 2021-05-20 23:07:24 |         MASTER-OAFA | (08h 19m 48.44s , -69d 44m 42.9s) |   C |    60 | 18.1 |        
   14531 | 2021-05-20 23:08:43 |         MASTER-OAFA | (08h 42m 15.57s , -69d 44m 02.7s) |   C |    60 | 18.1 |        
   14610 | 2021-05-20 23:10:03 |         MASTER-OAFA | (08h 55m 29.27s , -65d 53m 54.3s) |   C |    60 | 17.9 |        
   14690 | 2021-05-20 23:11:22 |         MASTER-OAFA | (09h 14m 33.64s , -65d 54m 51.6s) |   C |    60 | 18.0 |        
   14849 | 2021-05-20 23:14:01 |         MASTER-OAFA | (08h 39m 46.21s , -67d 49m 10.2s) |   C |    60 | 17.9 |        
   14929 | 2021-05-20 23:15:21 |         MASTER-OAFA | (09h 37m 19.28s , -67d 46m 50.2s) |   C |    60 | 18.0 |        
   15087 | 2021-05-20 23:18:00 |         MASTER-OAFA | (09h 44m 44.41s , -69d 42m 33.6s) |   C |    60 | 17.9 |        
   15247 | 2021-05-20 23:20:39 |         MASTER-OAFA | (09h 31m 46.55s , -65d 53m 16.2s) |   C |    60 | 18.0 |        
   15486 | 2021-05-20 23:24:38 |         MASTER-OAFA | (08h 38m 15.52s , -65d 56m 12.0s) |   C |    60 | 17.9 |        
   16045 | 2021-05-20 23:33:58 |         MASTER-OAFA | (09h 44m 40.95s , -69d 41m 04.3s) |   C |    60 | 17.9 |        
   17260 | 2021-05-20 23:54:12 |         MASTER-OAFA | (09h 44m 35.25s , -68d 18m 15.1s) |   C |    60 | 17.9 |        
  163066 | 2021-05-22 16:24:18 |         MASTER-SAAO | (09h 36m 57.25s , -67d 11m 51.3s) |   C |    60 | 16.8 |        
  163225 | 2021-05-22 16:26:58 |         MASTER-SAAO | (09h 44m 13.82s , -69d 05m 48.3s) |   C |    60 | 17.0 |        
  163384 | 2021-05-22 16:29:37 |         MASTER-SAAO | (09h 31m 25.44s , -65d 15m 57.1s) |   C |    60 | 17.3 |        
  165449 | 2021-05-22 17:04:01 |         MASTER-SAAO | (09h 37m 17.32s , -67d 09m 59.1s) |   C |    60 | 18.2 |        
  165608 | 2021-05-22 17:06:40 |         MASTER-SAAO | (09h 44m 30.51s , -69d 04m 42.3s) |   C |    60 | 18.4 |        
  165767 | 2021-05-22 17:09:19 |         MASTER-SAAO | (09h 31m 45.26s , -65d 16m 40.5s) |   C |    60 | 18.5 |        
  166636 | 2021-05-22 17:23:49 |         MASTER-SAAO | (09h 37m 19.31s , -67d 09m 29.4s) |   C |    60 | 18.4 |        
  166796 | 2021-05-22 17:26:29 |         MASTER-SAAO | (09h 44m 39.42s , -69d 03m 31.4s) |   C |    60 | 18.6 |        
  166956 | 2021-05-22 17:29:08 |         MASTER-SAAO | (09h 31m 54.83s , -65d 16m 18.7s) |   C |    60 | 18.6 |        
  168141 | 2021-05-22 17:48:53 |         MASTER-SAAO | (09h 02m 34.66s , -69d 03m 19.2s) |   C |    60 | 18.6 |        
  168221 | 2021-05-22 17:50:13 |         MASTER-SAAO | (09h 24m 52.78s , -69d 02m 01.0s) |   C |    60 | 18.7 |        
  168300 | 2021-05-22 17:51:33 |         MASTER-SAAO | (08h 58m 38.90s , -67d 07m 38.5s) |   C |    60 | 18.5 |        
  168380 | 2021-05-22 17:52:52 |         MASTER-SAAO | (09h 19m 14.81s , -67d 08m 43.1s) |   C |    60 | 18.6 |        
  169323 | 2021-05-22 18:08:35 |         MASTER-SAAO | (09h 02m 41.12s , -69d 02m 42.1s) |   C |    60 | 18.6 |        
  169402 | 2021-05-22 18:09:55 |         MASTER-SAAO | (09h 24m 53.62s , -69d 01m 31.4s) |   C |    60 | 18.7 |        
  169482 | 2021-05-22 18:11:14 |         MASTER-SAAO | (08h 58m 45.49s , -67d 08m 56.8s) |   C |    60 | 18.5 |        
  169562 | 2021-05-22 18:12:34 |         MASTER-SAAO | (09h 19m 18.49s , -67d 07m 40.1s) |   C |    60 | 18.6 |        
  170282 | 2021-05-22 18:24:34 |         MASTER-SAAO | (09h 02m 34.31s , -69d 00m 44.2s) |   C |    60 | 18.6 |        
  170361 | 2021-05-22 18:25:54 |         MASTER-SAAO | (09h 24m 59.32s , -69d 01m 51.2s) |   C |    60 | 18.8 |        
  170441 | 2021-05-22 18:27:14 |         MASTER-SAAO | (08h 58m 44.40s , -67d 08m 39.6s) |   C |    60 | 18.5 |        
  170521 | 2021-05-22 18:28:33 |         MASTER-SAAO | (09h 19m 21.36s , -67d 08m 36.8s) |   C |    60 | 18.7 |        
  170760 | 2021-05-22 18:32:33 |         MASTER-SAAO | (09h 07m 50.20s , -70d 54m 27.9s) |   C |    60 | 18.7 |        
  170840 | 2021-05-22 18:33:52 |         MASTER-SAAO | (09h 32m 21.54s , -70d 55m 38.2s) |   C |    60 | 18.8 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4295
TYPE = 35
DAYS = 0


MASTER-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) started inspect of the FERMI GRB 210520A ( Fermi GBM team, GCN 30059) errorbox  12138 sec after notice time and 12187 sec after trigger time at 2021-05-20 22:30:10 UT, with upper limit up to  17.0 mag. Observations started at twilight.  The observations began at zenith distance = 39 deg. The sun  altitude  is -10.0 deg. 

The galactic latitude b = -14 deg., longitude l = 285 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1617942

We obtain a following upper limits.  

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

   12218 | 2021-05-20 22:30:10 |         MASTER-OAFA | (09h 02m 19.62s , -69d 42m 16.2s) |   C |    60 | 16.8 |        
   12297 | 2021-05-20 22:31:29 |         MASTER-OAFA | (09h 24m 33.57s , -69d 42m 48.7s) |   C |    60 | 17.0 |        
   12376 | 2021-05-20 22:32:49 |         MASTER-OAFA | (08h 58m 19.03s , -67d 47m 42.0s) |   C |    60 | 17.0 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4294
TYPE = 35
DAYS = 0


MASTER-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) started inspect of the FERMI GRB 210520A ( Fermi GBM team, GCN 30059) errorbox  12138 sec after notice time and 12187 sec after trigger time at 2021-05-20 22:30:10 UT, with upper limit up to  17.0 mag. Observations started at twilight.  The observations began at zenith distance = 39 deg. The sun  altitude  is -10.0 deg. 

The galactic latitude b = -14 deg., longitude l = 285 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1617942

We obtain a following upper limits.  

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

   12218 | 2021-05-20 22:30:10 |         MASTER-OAFA | (09h 02m 19.62s , -69d 42m 16.2s) |   C |    60 | 16.8 |        
   12297 | 2021-05-20 22:31:29 |         MASTER-OAFA | (09h 24m 33.57s , -69d 42m 48.7s) |   C |    60 | 17.0 |        
   12376 | 2021-05-20 22:32:49 |         MASTER-OAFA | (08h 58m 19.03s , -67d 47m 42.0s) |   C |    60 | 17.0 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4293
TYPE = 34
DAYS = 0


MASTER-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) started inspect of the FERMI GRB 210520A ( Fermi GBM team, GCN 30059) errorbox  12138 sec after notice time and 12187 sec after trigger time at 2021-05-20 22:30:10 UT, with upper limit up to  17.0 mag. Observations started at twilight.  The observations began at zenith distance = 39 deg. The sun  altitude  is -10.0 deg. 

The galactic latitude b = -14 deg., longitude l = 285 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1617942

We obtain a following upper limits.  

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

   12218 | 2021-05-20 22:30:10 |         MASTER-OAFA | (09h 02m 19.62s , -69d 42m 16.2s) |   C |    60 | 16.8 |        
   12297 | 2021-05-20 22:31:29 |         MASTER-OAFA | (09h 24m 33.57s , -69d 42m 48.7s) |   C |    60 | 17.0 |        
   12376 | 2021-05-20 22:32:49 |         MASTER-OAFA | (08h 58m 19.03s , -67d 47m 42.0s) |   C |    60 | 17.0 |        
Filter C is a clear (unfiltred) band. 


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

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