MASTER Net MASTER Database: GRB210824.18 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 SWIFT GRB210824.18
Trignum 1070157
Trigger time 2021-08-24 04:15:22
Notice time 2021-08-24 04:19:00.804758
Coord, eb (15h 28m 25.20s , +11d 09m 07.2s) , 0.002
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)

All alerts for this trigger
id noticetime coord2000 satel errorbox type trigger seq trig_type links
2657307 2024-11-02 17:11:47.76321 15h 28m 31.68s +11d 08m 06.0s SWIFT 0.05 retraction 1070157 1 4044 retraction
1698432 2021-08-24 04:15:59.723269 15h 28m 34.22s +11d 08m 43.8s SWIFT 0 alert 1070157 2 68 alert
1698438 2021-08-24 04:19:07.335385 15h 28m 25.20s +11d 09m 07.2s SWIFT 0.002 alert 1070157 1 67 alert
1698420 2021-08-24 04:10:47.948611 15h 28m 31.68s +11d 08m 06.0s SWIFT 0.05 alert 1070157 1 61 alert

DAYS:

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

Synchronous WFC images
Distance datetime coord2000 observatory camera links
112.0 2021-08-24 04:12:59.766 22h 46m 31.00s -40d 37m 00.0s SAAO 111341 Database SAAO
Errorbox center visibility at MASTER facilities
trigger notice notice+1hr now

2021-08-24 04:15:22 (JD 2459450.677338)

Siderial time 4.942052 h

Ra 15:28:25.20 Dec 11:09:07.20
(232.105000d, 11.152000d)

Rise 2021-08-24 10:35:05

Transit 2021-08-24 17:45:32

Set 2021-08-25 00:55:58

Amur

Object: Altitude: 22.48 Azimuth: 279.85

Sun: Altitude: 49.79 Azimuth: 16.88

Moon: Altitude: -46.54 Azimuth: 165.03

Tunka

Object: Altitude: 7.20 Azimuth: 261.10

Sun: Altitude: 47.90 Azimuth: 340.17

Moon: Altitude: -37.52 Azimuth: 134.60

Kislovodsk

Object: Altitude: -29.88 Azimuth: 210.83

Sun: Altitude: 19.25 Azimuth: 272.91

Moon: Altitude: -1.54 Azimuth: 80.78

Tavrida

Object: Altitude: -31.68 Azimuth: 201.37

Sun: Altitude: 13.16 Azimuth: 267.26

Moon: Altitude: 4.21 Azimuth: 74.78

SAAO

Object: Altitude: -68.23 Azimuth: 346.07

Sun: Altitude: -10.67 Azimuth: 263.49

Moon: Altitude: 26.87 Azimuth: 98.22

IAC

Object: Altitude: -39.80 Azimuth: 137.26

Sun: Altitude: -29.82 Azimuth: 235.83

Moon: Altitude: 46.27 Azimuth: 38.40

Argentina

Object: Altitude: -10.12 Azimuth: 96.92

Sun: Altitude: -68.66 Azimuth: 15.80

Moon: Altitude: 55.11 Azimuth: 232.21

Mexico

Object: Altitude: 36.41 Azimuth: 80.59

Sun: Altitude: -28.37 Azimuth: 125.56

Moon: Altitude: 14.24 Azimuth: 288.34

Ural

Object: Altitude: -12.83 Azimuth: 224.29

Sun: Altitude: 26.97 Azimuth: 292.71

Moon: Altitude: -12.84 Azimuth: 95.65

Vostryakovo

Object: Altitude: -20.91 Azimuth: 203.40

Sun: Altitude: 15.59 Azimuth: 272.91

Moon: Altitude: -0.73 Azimuth: 77.41

Gal. latitude: 49.260725 Gal. longitude: 17.455259

Dist. to Sun: 77.348747

Dist. to Moon: 122.980396

Moon coord.: (354.325510 d, -7.720193 d)

Sun coord.: (152.981078 d, 11.144834 d)

Lunar disk: 0.965919

Lunar phase: 21.276707

Lunar bright limb: 79.095445

No SN in this field

2021-08-24 04:19:00 (JD 2459450.679861)

Siderial time 5.002773 h

Ra 15:28:25.20 Dec 11:09:07.20
(232.105000d, 11.152000d)

Rise 2021-08-24 10:35:05

Transit 2021-08-24 17:45:32

Set 2021-08-25 00:55:58

Amur

Object: Altitude: 23.06 Azimuth: 280.59

Sun: Altitude: 49.62 Azimuth: 18.23

Moon: Altitude: -46.67 Azimuth: 166.29

Tunka

Object: Altitude: 7.75 Azimuth: 261.80

Sun: Altitude: 48.09 Azimuth: 341.47

Moon: Altitude: -37.89 Azimuth: 135.60

Kislovodsk

Object: Altitude: -29.54 Azimuth: 211.78

Sun: Altitude: 19.90 Azimuth: 273.56

Moon: Altitude: -2.16 Azimuth: 81.39

Tavrida

Object: Altitude: -31.44 Azimuth: 202.38

Sun: Altitude: 13.80 Azimuth: 267.89

Moon: Altitude: 3.61 Azimuth: 75.42

SAAO

Object: Altitude: -68.03 Azimuth: 343.74

Sun: Altitude: -9.91 Azimuth: 263.02

Moon: Altitude: 26.12 Azimuth: 97.71

IAC

Object: Altitude: -40.34 Azimuth: 138.19

Sun: Altitude: -29.16 Azimuth: 236.51

Moon: Altitude: 45.80 Azimuth: 39.46

Argentina

Object: Altitude: -10.89 Azimuth: 96.46

Sun: Altitude: -68.85 Azimuth: 13.40

Moon: Altitude: 55.69 Azimuth: 231.05

Mexico

Object: Altitude: 35.64 Azimuth: 81.15

Sun: Altitude: -29.00 Azimuth: 126.28

Moon: Altitude: 14.96 Azimuth: 288.84

Ural

Object: Altitude: -12.48 Azimuth: 225.14

Sun: Altitude: 27.42 Azimuth: 293.57

Moon: Altitude: -13.31 Azimuth: 96.40

Vostryakovo

Object: Altitude: -20.70 Azimuth: 204.33

Sun: Altitude: 16.10 Azimuth: 273.67

Moon: Altitude: -1.21 Azimuth: 78.14

Gal. latitude: 49.260725 Gal. longitude: 17.455259

Dist. to Sun: 77.346637

Dist. to Moon: 123.008026

Moon coord.: (354.355726 d, -7.706400 d)

Sun coord.: (152.983396 d, 11.143972 d)

Lunar disk: 0.965826

Lunar phase: 21.306280

Lunar bright limb: 79.072797

No SN in this field

2021-08-24 05:19:00 (JD 2459450.721528)

Siderial time 6.005511 h

Ra 15:28:25.20 Dec 11:09:07.20
(232.105000d, 11.152000d)

Rise 2021-08-24 10:35:05

Transit 2021-08-24 17:45:32

Set 2021-08-25 00:55:58

Amur

Object: Altitude: 32.22 Azimuth: 293.68

Sun: Altitude: 45.00 Azimuth: 38.93

Moon: Altitude: -46.95 Azimuth: 187.41

Tunka

Object: Altitude: 17.03 Azimuth: 273.57

Sun: Altitude: 49.27 Azimuth: 3.77

Moon: Altitude: -42.90 Azimuth: 153.39

Kislovodsk

Object: Altitude: -22.68 Azimuth: 226.35

Sun: Altitude: 30.58 Azimuth: 284.79

Moon: Altitude: -12.48 Azimuth: 91.56

Tavrida

Object: Altitude: -26.05 Azimuth: 218.07

Sun: Altitude: 24.42 Azimuth: 278.70

Moon: Altitude: -6.41 Azimuth: 85.81

SAAO

Object: Altitude: -61.19 Azimuth: 312.67

Sun: Altitude: 2.53 Azimuth: 255.12

Moon: Altitude: 13.75 Azimuth: 89.80

IAC

Object: Altitude: -47.57 Azimuth: 156.14

Sun: Altitude: -17.55 Azimuth: 246.41

Moon: Altitude: 36.59 Azimuth: 54.27

Argentina

Object: Altitude: -23.65 Azimuth: 88.67

Sun: Altitude: -67.32 Azimuth: 333.46

Moon: Altitude: 63.34 Azimuth: 206.66

Mexico

Object: Altitude: 22.80 Azimuth: 89.53

Sun: Altitude: -38.42 Azimuth: 139.92

Moon: Altitude: 26.53 Azimuth: 298.06

Ural

Object: Altitude: -6.05 Azimuth: 238.60

Sun: Altitude: 34.39 Azimuth: 308.71

Moon: Altitude: -20.82 Azimuth: 109.29

Vostryakovo

Object: Altitude: -16.20 Azimuth: 219.15

Sun: Altitude: 24.46 Azimuth: 286.60

Moon: Altitude: -9.23 Azimuth: 90.18

Gal. latitude: 49.260725 Gal. longitude: 17.455259

Dist. to Sun: 77.311793

Dist. to Moon: 123.463518

Moon coord.: (354.854148 d, -7.478435 d)

Sun coord.: (153.021678 d, 11.129731 d)

Lunar disk: 0.964260

Lunar phase: 21.794688

Lunar bright limb: 78.707558

No SN in this field

2024-12-23 13:00:29 (JD 2460668.042002)

Siderial time 21.686815 h

Ra 15:28:25.20 Dec 11:09:07.20
(232.105000d, 11.152000d)

Rise 2024-12-25 02:30:24

Transit 2024-12-24 09:44:47

Set 2024-12-24 16:55:13

Amur

Object: Altitude: -28.47 Azimuth: 183.42

Sun: Altitude: -50.79 Azimuth: 119.49

Moon: Altitude: -28.78 Azimuth: 237.26

Tunka

Object: Altitude: -24.39 Azimuth: 156.90

Sun: Altitude: -35.82 Azimuth: 97.14

Moon: Altitude: -38.33 Azimuth: 210.10

Kislovodsk

Object: Altitude: 1.94 Azimuth: 103.62

Sun: Altitude: 4.26 Azimuth: 51.43

Moon: Altitude: -38.33 Azimuth: 129.55

Tavrida

Object: Altitude: 8.11 Azimuth: 97.69

Sun: Altitude: 8.15 Azimuth: 44.97

Moon: Altitude: -32.80 Azimuth: 121.65

SAAO

Object: Altitude: 5.24 Azimuth: 106.75

Sun: Altitude: 56.72 Azimuth: 96.20

Moon: Altitude: -23.40 Azimuth: 68.77

IAC

Object: Altitude: 49.67 Azimuth: 72.85

Sun: Altitude: 38.26 Azimuth: 359.02

Moon: Altitude: 3.73 Azimuth: 83.55

Argentina

Object: Altitude: 45.07 Azimuth: 199.28

Sun: Altitude: 42.20 Azimuth: 273.98

Moon: Altitude: 49.81 Azimuth: 127.60

Mexico

Object: Altitude: 35.75 Azimuth: 278.93

Sun: Altitude: -15.65 Azimuth: 288.27

Moon: Altitude: 53.72 Azimuth: 342.58

Ural

Object: Altitude: -3.69 Azimuth: 117.11

Sun: Altitude: -11.90 Azimuth: 65.04

Moon: Altitude: -34.48 Azimuth: 155.17

Vostryakovo

Object: Altitude: 7.25 Azimuth: 99.14

Sun: Altitude: -0.98 Azimuth: 47.52

Moon: Altitude: -28.48 Azimuth: 130.53

Gal. latitude: 49.260725 Gal. longitude: 17.455259

Dist. to Sun: 52.150948

Dist. to Moon: 46.834360

Moon coord.: (187.528019 d, -3.893986 d)

Sun coord.: (272.014486 d, -23.433965 d)

Lunar disk: 0.443834

Lunar phase: 96.449746

Lunar bright limb: 113.168660

No SN in this field
Recent coverage and limits telegrams

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

  ID = 4866
TYPE = 35
DAYS = 1


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB 210824A ( K. L. Page et al., GCN 30700) errorbox  45612 sec after notice time and 45653 sec after trigger time at 2021-08-24 16:50:54 UT, with upper limit up to  19.4 mag. Observations started at twilight.  The observations began at zenith distance = 46 deg. The sun  altitude  is -7.8 deg. 

MASTER-Tavrida robotic telescope  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the SWIFT GRB 210824A errorbox  48172 sec after notice time and 48213 sec after trigger time at 2021-08-24 17:33:34 UT, with upper limit up to  19.1 mag. Observations started at twilight.  The observations began at zenith distance = 47 deg. The sun  altitude  is -10.9 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB 210824A errorbox  50320 sec after notice time and 50361 sec after trigger time at 2021-08-24 18:09:23 UT, with upper limit up to  17.4 mag. The observations began at zenith distance = 56 deg. The sun  altitude  is -21.7 deg. 

The galactic latitude b = 49 deg., longitude l = 17 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1698420

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

   45683 |         MASTER-SAAO |   C |    60 | 16.0 |        
   45843 |         MASTER-SAAO |   C |    60 | 17.0 |        
   45922 |         MASTER-SAAO |   C |    60 | 17.2 |        
   46644 |         MASTER-SAAO |   C |    60 | 18.5 |        
   46804 |         MASTER-SAAO |   C |    60 | 18.7 |        
   46883 |         MASTER-SAAO |   C |    60 | 18.8 |        
   47601 |         MASTER-SAAO |   C |    60 | 19.4 |        
   47760 |         MASTER-SAAO |   C |    60 | 19.3 |        
   47840 |         MASTER-SAAO |   C |    60 | 19.4 |        
   48303 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   49423 |      MASTER-Tavrida |   C |   180 | 19.1 |        
   50196 |      MASTER-Tavrida |   C |    60 | 18.7 |        
   50391 |   MASTER-Kislovodsk |   C |    60 | 15.8 |        
   50572 |      MASTER-Tavrida |   C |   180 | 19.0 |        
   50630 |   MASTER-Kislovodsk |   C |   180 | 15.1 |        
   50630 |   MASTER-Kislovodsk |   C |   180 | 15.3 |        
   51345 |      MASTER-Tavrida |   C |    60 | 18.4 |        
   51799 |      MASTER-Tavrida |   C |    60 | 18.4 |        
   51878 |      MASTER-Tavrida |   C |    60 | 18.4 |        
   52400 |   MASTER-Kislovodsk |   C |    60 | 16.6 |        
   52588 |         MASTER-SAAO |   C |    60 | 18.8 |        
   52847 |      MASTER-Tavrida |   C |    60 | 18.1 |        
   52926 |      MASTER-Tavrida |   C |    60 | 18.1 |        
   53422 |   MASTER-Kislovodsk |   C |   180 | 17.1 |        
   53422 |   MASTER-Kislovodsk |   C |   180 | 17.4 |        
   53548 |         MASTER-SAAO |   C |    60 | 18.6 |        
   53563 |   MASTER-Kislovodsk |   C |    60 | 17.0 |        
   53796 |      MASTER-Tavrida |   C |    60 | 17.9 |        
   53875 |      MASTER-Tavrida |   C |    60 | 17.9 |        
   54503 |         MASTER-SAAO |   C |    60 | 18.2 |        
   54664 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
   54664 |   MASTER-Kislovodsk |   C |   180 | 17.1 |        
   54799 |      MASTER-Tavrida |   C |   180 | 18.0 |        
   54802 |         MASTER-SAAO |   C |   180 | 18.5 |        
   54938 |      MASTER-Tavrida |   C |    60 | 17.6 |        
   55885 |         MASTER-SAAO |   C |   180 | 17.0 |        
   55933 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   56152 |      MASTER-Tavrida |   C |    60 | 17.5 |        
   56810 |   MASTER-Kislovodsk |   C |    60 | 12.8 |        
   56810 |   MASTER-Kislovodsk |   C |    60 | 14.0 |        
   57044 |         MASTER-SAAO |   C |   180 | 15.9 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4865
TYPE = 35
DAYS = 0


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB 210824A ( K. L. Page et al., GCN 30700) errorbox  45612 sec after notice time and 45332 sec after trigger time at 2021-08-24 16:50:54 UT, with upper limit up to  19.4 mag. Observations started at twilight.  The observations began at zenith distance = 46 deg. The sun  altitude  is -7.8 deg. 

MASTER-Tavrida robotic telescope  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the SWIFT GRB 210824A errorbox  48172 sec after notice time and 47892 sec after trigger time at 2021-08-24 17:33:34 UT, with upper limit up to  19.1 mag. Observations started at twilight.  The observations began at zenith distance = 47 deg. The sun  altitude  is -10.9 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB 210824A errorbox  50320 sec after notice time and 50041 sec after trigger time at 2021-08-24 18:09:23 UT, with upper limit up to  17.4 mag. The observations began at zenith distance = 56 deg. The sun  altitude  is -21.7 deg. 

The galactic latitude b = 49 deg., longitude l = 17 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1698433

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

   45363 |         MASTER-SAAO |   C |    60 | 16.0 |        
   45522 |         MASTER-SAAO |   C |    60 | 17.0 |        
   45602 |         MASTER-SAAO |   C |    60 | 17.2 |        
   46324 |         MASTER-SAAO |   C |    60 | 18.5 |        
   46483 |         MASTER-SAAO |   C |    60 | 18.7 |        
   46563 |         MASTER-SAAO |   C |    60 | 18.8 |        
   47281 |         MASTER-SAAO |   C |    60 | 19.4 |        
   47440 |         MASTER-SAAO |   C |    60 | 19.3 |        
   47520 |         MASTER-SAAO |   C |    60 | 19.4 |        
   47983 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   49103 |      MASTER-Tavrida |   C |   180 | 19.1 |        
   49875 |      MASTER-Tavrida |   C |    60 | 18.7 |        
   50071 |   MASTER-Kislovodsk |   C |    60 | 15.8 |        
   50252 |      MASTER-Tavrida |   C |   180 | 19.0 |        
   50310 |   MASTER-Kislovodsk |   C |   180 | 15.1 |        
   50310 |   MASTER-Kislovodsk |   C |   180 | 15.3 |        
   51024 |      MASTER-Tavrida |   C |    60 | 18.4 |        
   51479 |      MASTER-Tavrida |   C |    60 | 18.4 |        
   51558 |      MASTER-Tavrida |   C |    60 | 18.4 |        
   52080 |   MASTER-Kislovodsk |   C |    60 | 16.6 |        
   52268 |         MASTER-SAAO |   C |    60 | 18.8 |        
   52527 |      MASTER-Tavrida |   C |    60 | 18.1 |        
   52605 |      MASTER-Tavrida |   C |    60 | 18.1 |        
   53102 |   MASTER-Kislovodsk |   C |   180 | 17.1 |        
   53102 |   MASTER-Kislovodsk |   C |   180 | 17.4 |        
   53227 |         MASTER-SAAO |   C |    60 | 18.6 |        
   53242 |   MASTER-Kislovodsk |   C |    60 | 17.0 |        
   53476 |      MASTER-Tavrida |   C |    60 | 17.9 |        
   53555 |      MASTER-Tavrida |   C |    60 | 17.9 |        
   54344 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
   54344 |   MASTER-Kislovodsk |   C |   180 | 17.1 |        
   54478 |      MASTER-Tavrida |   C |   180 | 18.0 |        
   54482 |         MASTER-SAAO |   C |   180 | 18.5 |        
   54617 |      MASTER-Tavrida |   C |    60 | 17.6 |        
   55565 |         MASTER-SAAO |   C |   180 | 17.0 |        
   55613 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   55831 |      MASTER-Tavrida |   C |    60 | 17.5 |        
   56489 |   MASTER-Kislovodsk |   C |    60 | 12.8 |        
   56489 |   MASTER-Kislovodsk |   C |    60 | 14.0 |        
   56723 |         MASTER-SAAO |   C |   180 | 15.9 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4864
TYPE = 35
DAYS = 0


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB 210824A ( K. L. Page et al., GCN 30700) errorbox  45612 sec after notice time and 45332 sec after trigger time at 2021-08-24 16:50:54 UT, with upper limit up to  19.4 mag. Observations started at twilight.  The observations began at zenith distance = 46 deg. The sun  altitude  is -7.8 deg. 

MASTER-Tavrida robotic telescope  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the SWIFT GRB 210824A errorbox  48172 sec after notice time and 47892 sec after trigger time at 2021-08-24 17:33:34 UT, with upper limit up to  19.1 mag. Observations started at twilight.  The observations began at zenith distance = 47 deg. The sun  altitude  is -10.9 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB 210824A errorbox  50320 sec after notice time and 50041 sec after trigger time at 2021-08-24 18:09:23 UT, with upper limit up to  17.4 mag. The observations began at zenith distance = 56 deg. The sun  altitude  is -21.7 deg. 

The galactic latitude b = 49 deg., longitude l = 17 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1698433

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

   45363 |         MASTER-SAAO |   C |    60 | 16.0 |        
   45522 |         MASTER-SAAO |   C |    60 | 17.0 |        
   45602 |         MASTER-SAAO |   C |    60 | 17.2 |        
   46324 |         MASTER-SAAO |   C |    60 | 18.5 |        
   46483 |         MASTER-SAAO |   C |    60 | 18.7 |        
   46563 |         MASTER-SAAO |   C |    60 | 18.8 |        
   47281 |         MASTER-SAAO |   C |    60 | 19.4 |        
   47440 |         MASTER-SAAO |   C |    60 | 19.3 |        
   47520 |         MASTER-SAAO |   C |    60 | 19.4 |        
   47983 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   49103 |      MASTER-Tavrida |   C |   180 | 19.1 |        
   49875 |      MASTER-Tavrida |   C |    60 | 18.7 |        
   50071 |   MASTER-Kislovodsk |   C |    60 | 15.8 |        
   50252 |      MASTER-Tavrida |   C |   180 | 19.0 |        
   50310 |   MASTER-Kislovodsk |   C |   180 | 15.1 |        
   50310 |   MASTER-Kislovodsk |   C |   180 | 15.3 |        
   51024 |      MASTER-Tavrida |   C |    60 | 18.4 |        
   51479 |      MASTER-Tavrida |   C |    60 | 18.4 |        
   51558 |      MASTER-Tavrida |   C |    60 | 18.4 |        
   52080 |   MASTER-Kislovodsk |   C |    60 | 16.6 |        
   52268 |         MASTER-SAAO |   C |    60 | 18.8 |        
   52527 |      MASTER-Tavrida |   C |    60 | 18.1 |        
   52605 |      MASTER-Tavrida |   C |    60 | 18.1 |        
   53102 |   MASTER-Kislovodsk |   C |   180 | 17.1 |        
   53102 |   MASTER-Kislovodsk |   C |   180 | 17.4 |        
   53227 |         MASTER-SAAO |   C |    60 | 18.6 |        
   53242 |   MASTER-Kislovodsk |   C |    60 | 17.0 |        
   53476 |      MASTER-Tavrida |   C |    60 | 17.9 |        
   53555 |      MASTER-Tavrida |   C |    60 | 17.9 |        
   54344 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
   54344 |   MASTER-Kislovodsk |   C |   180 | 17.1 |        
   54478 |      MASTER-Tavrida |   C |   180 | 18.0 |        
   54482 |         MASTER-SAAO |   C |   180 | 18.5 |        
   54617 |      MASTER-Tavrida |   C |    60 | 17.6 |        
   55565 |         MASTER-SAAO |   C |   180 | 17.0 |        
   55613 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   55831 |      MASTER-Tavrida |   C |    60 | 17.5 |        
   56489 |   MASTER-Kislovodsk |   C |    60 | 12.8 |        
   56489 |   MASTER-Kislovodsk |   C |    60 | 14.0 |        
   56723 |         MASTER-SAAO |   C |   180 | 15.9 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4863
TYPE = 34
DAYS = 0


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB 210824A ( K. L. Page et al., GCN 30700) errorbox  45612 sec after notice time and 45332 sec after trigger time at 2021-08-24 16:50:54 UT, with upper limit up to  19.4 mag. Observations started at twilight.  The observations began at zenith distance = 46 deg. The sun  altitude  is -7.8 deg. 

MASTER-Tavrida robotic telescope  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the SWIFT GRB 210824A errorbox  48172 sec after notice time and 47892 sec after trigger time at 2021-08-24 17:33:34 UT, with upper limit up to  19.1 mag. Observations started at twilight.  The observations began at zenith distance = 47 deg. The sun  altitude  is -10.9 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB 210824A errorbox  50320 sec after notice time and 50041 sec after trigger time at 2021-08-24 18:09:23 UT, with upper limit up to  17.4 mag. The observations began at zenith distance = 56 deg. The sun  altitude  is -21.7 deg. 

The galactic latitude b = 49 deg., longitude l = 17 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1698433

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

   45363 |         MASTER-SAAO |   C |    60 | 16.0 |        
   45522 |         MASTER-SAAO |   C |    60 | 17.0 |        
   45602 |         MASTER-SAAO |   C |    60 | 17.2 |        
   46324 |         MASTER-SAAO |   C |    60 | 18.5 |        
   46483 |         MASTER-SAAO |   C |    60 | 18.7 |        
   46563 |         MASTER-SAAO |   C |    60 | 18.8 |        
   47281 |         MASTER-SAAO |   C |    60 | 19.4 |        
   47440 |         MASTER-SAAO |   C |    60 | 19.3 |        
   47520 |         MASTER-SAAO |   C |    60 | 19.4 |        
   47983 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   49103 |      MASTER-Tavrida |   C |   180 | 19.1 |        
   49875 |      MASTER-Tavrida |   C |    60 | 18.7 |        
   50071 |   MASTER-Kislovodsk |   C |    60 | 15.8 |        
   50252 |      MASTER-Tavrida |   C |   180 | 19.0 |        
   50310 |   MASTER-Kislovodsk |   C |   180 | 15.1 |        
   50310 |   MASTER-Kislovodsk |   C |   180 | 15.3 |        
   51024 |      MASTER-Tavrida |   C |    60 | 18.4 |        
   51479 |      MASTER-Tavrida |   C |    60 | 18.4 |        
   51558 |      MASTER-Tavrida |   C |    60 | 18.4 |        
   52080 |   MASTER-Kislovodsk |   C |    60 | 16.6 |        
   52268 |         MASTER-SAAO |   C |    60 | 18.8 |        
   52527 |      MASTER-Tavrida |   C |    60 | 18.1 |        
   52605 |      MASTER-Tavrida |   C |    60 | 18.1 |        
   53102 |   MASTER-Kislovodsk |   C |   180 | 17.1 |        
   53102 |   MASTER-Kislovodsk |   C |   180 | 17.4 |        
   53227 |         MASTER-SAAO |   C |    60 | 18.6 |        
   53242 |   MASTER-Kislovodsk |   C |    60 | 17.0 |        
   53476 |      MASTER-Tavrida |   C |    60 | 17.9 |        
   53555 |      MASTER-Tavrida |   C |    60 | 17.9 |        
   54344 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
   54344 |   MASTER-Kislovodsk |   C |   180 | 17.1 |        
   54478 |      MASTER-Tavrida |   C |   180 | 18.0 |        
   54482 |         MASTER-SAAO |   C |   180 | 18.5 |        
   54617 |      MASTER-Tavrida |   C |    60 | 17.6 |        
   55565 |         MASTER-SAAO |   C |   180 | 17.0 |        
   55613 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   55831 |      MASTER-Tavrida |   C |    60 | 17.5 |        
   56489 |   MASTER-Kislovodsk |   C |    60 | 12.8 |        
   56489 |   MASTER-Kislovodsk |   C |    60 | 14.0 |        
   56723 |         MASTER-SAAO |   C |   180 | 15.9 |        
Filter C is a clear (unfiltred) band. 


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

MASTER, 2002-2024