MASTER Net MASTER Database: GRB210824.17 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 GRB210824.17
Trignum 1070157
Trigger time 2021-08-24 04:10:01.64
Notice time 2021-08-24 04:10:47.948611
Coord, eb (15h 28m 31.68s , +11d 08m 06.0s) , 0.05
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
112.5 2021-08-24 04:09:59.764 22h 54m 12.00s -48d 10m 58.0s SAAO 111341 Database SAAO
Errorbox center visibility at MASTER facilities
trigger notice notice+1hr now

2021-08-24 04:10:01 (JD 2459450.673623)

Siderial time 4.852641 h

Ra 15:28:31.68 Dec 11:08:06.00
(232.132000d, 11.135000d)

Rise 2021-08-24 10:35:18

Transit 2021-08-24 17:45:38

Set 2021-08-25 00:55:58

Amur

Object: Altitude: 21.61 Azimuth: 278.75

Sun: Altitude: 50.03 Azimuth: 14.87

Moon: Altitude: -46.33 Azimuth: 163.19

Tunka

Object: Altitude: 6.35 Azimuth: 260.05

Sun: Altitude: 47.61 Azimuth: 338.27

Moon: Altitude: -36.96 Azimuth: 133.14

Kislovodsk

Object: Altitude: -30.39 Azimuth: 209.39

Sun: Altitude: 18.28 Azimuth: 271.97

Moon: Altitude: -0.63 Azimuth: 79.87

Tavrida

Object: Altitude: -32.04 Azimuth: 199.85

Sun: Altitude: 12.21 Azimuth: 266.33

Moon: Altitude: 5.08 Azimuth: 73.84

SAAO

Object: Altitude: -68.46 Azimuth: 349.66

Sun: Altitude: -11.80 Azimuth: 264.18

Moon: Altitude: 27.96 Azimuth: 98.98

IAC

Object: Altitude: -38.98 Azimuth: 135.88

Sun: Altitude: -30.79 Azimuth: 234.80

Moon: Altitude: 46.95 Azimuth: 36.82

Argentina

Object: Altitude: -8.96 Azimuth: 97.60

Sun: Altitude: -68.32 Azimuth: 19.26

Moon: Altitude: 54.24 Azimuth: 233.85

Mexico

Object: Altitude: 37.55 Azimuth: 79.71

Sun: Altitude: -27.43 Azimuth: 124.52

Moon: Altitude: 13.17 Azimuth: 287.60

Ural

Object: Altitude: -13.36 Azimuth: 223.03

Sun: Altitude: 26.29 Azimuth: 291.45

Moon: Altitude: -12.16 Azimuth: 94.53

Vostryakovo

Object: Altitude: -21.22 Azimuth: 202.00

Sun: Altitude: 14.83 Azimuth: 271.80

Moon: Altitude: -0.03 Azimuth: 76.33

Gal. latitude: 49.229303 Gal. longitude: 17.452438

Dist. to Sun: 77.380695

Dist. to Moon: 122.912615

Moon coord.: (354.281011 d, -7.740502 d)

Sun coord.: (152.977664 d, 11.146104 d)

Lunar disk: 0.966057

Lunar phase: 21.233162

Lunar bright limb: 79.128907

No SN in this field

2021-08-24 04:10:47 (JD 2459450.674155)

Siderial time 4.865454 h

Ra 15:28:31.68 Dec 11:08:06.00
(232.132000d, 11.135000d)

Rise 2021-08-24 10:35:18

Transit 2021-08-24 17:45:38

Set 2021-08-25 00:55:58

Amur

Object: Altitude: 21.73 Azimuth: 278.90

Sun: Altitude: 49.99 Azimuth: 15.16

Moon: Altitude: -46.36 Azimuth: 163.45

Tunka

Object: Altitude: 6.47 Azimuth: 260.20

Sun: Altitude: 47.65 Azimuth: 338.54

Moon: Altitude: -37.04 Azimuth: 133.35

Kislovodsk

Object: Altitude: -30.32 Azimuth: 209.60

Sun: Altitude: 18.42 Azimuth: 272.11

Moon: Altitude: -0.76 Azimuth: 80.00

Tavrida

Object: Altitude: -31.99 Azimuth: 200.06

Sun: Altitude: 12.34 Azimuth: 266.46

Moon: Altitude: 4.95 Azimuth: 73.97

SAAO

Object: Altitude: -68.43 Azimuth: 349.15

Sun: Altitude: -11.64 Azimuth: 264.08

Moon: Altitude: 27.80 Azimuth: 98.87

IAC

Object: Altitude: -39.10 Azimuth: 136.07

Sun: Altitude: -30.65 Azimuth: 234.95

Moon: Altitude: 46.86 Azimuth: 37.05

Argentina

Object: Altitude: -9.12 Azimuth: 97.50

Sun: Altitude: -68.37 Azimuth: 18.77

Moon: Altitude: 54.37 Azimuth: 233.62

Mexico

Object: Altitude: 37.39 Azimuth: 79.83

Sun: Altitude: -27.56 Azimuth: 124.67

Moon: Altitude: 13.33 Azimuth: 287.71

Ural

Object: Altitude: -13.29 Azimuth: 223.21

Sun: Altitude: 26.39 Azimuth: 291.63

Moon: Altitude: -12.26 Azimuth: 94.69

Vostryakovo

Object: Altitude: -21.18 Azimuth: 202.20

Sun: Altitude: 14.94 Azimuth: 271.96

Moon: Altitude: -0.13 Azimuth: 76.49

Gal. latitude: 49.229303 Gal. longitude: 17.452438

Dist. to Sun: 77.380250

Dist. to Moon: 122.918449

Moon coord.: (354.287388 d, -7.737591 d)

Sun coord.: (152.978153 d, 11.145922 d)

Lunar disk: 0.966037

Lunar phase: 21.239402

Lunar bright limb: 79.124104

No SN in this field

2021-08-24 05:10:47 (JD 2459450.715822)

Siderial time 5.868191 h

Ra 15:28:31.68 Dec 11:08:06.00
(232.132000d, 11.135000d)

Rise 2021-08-24 10:35:18

Transit 2021-08-24 17:45:38

Set 2021-08-25 00:55:58

Amur

Object: Altitude: 30.98 Azimuth: 291.77

Sun: Altitude: 45.81 Azimuth: 36.30

Moon: Altitude: -47.11 Azimuth: 184.52

Tunka

Object: Altitude: 15.73 Azimuth: 271.92

Sun: Altitude: 49.32 Azimuth: 0.68

Moon: Altitude: -42.36 Azimuth: 150.81

Kislovodsk

Object: Altitude: -23.77 Azimuth: 224.47

Sun: Altitude: 29.14 Azimuth: 283.16

Moon: Altitude: -11.06 Azimuth: 90.16

Tavrida

Object: Altitude: -26.96 Azimuth: 216.02

Sun: Altitude: 22.97 Azimuth: 277.17

Moon: Altitude: -5.02 Azimuth: 84.40

SAAO

Object: Altitude: -62.44 Azimuth: 316.11

Sun: Altitude: 0.85 Azimuth: 256.23

Moon: Altitude: 15.45 Azimuth: 90.84

IAC

Object: Altitude: -46.80 Azimuth: 153.35

Sun: Altitude: -19.20 Azimuth: 245.18

Moon: Altitude: 37.98 Azimuth: 52.51

Argentina

Object: Altitude: -21.87 Azimuth: 89.77

Sun: Altitude: -68.03 Azimuth: 338.42

Moon: Altitude: 62.56 Azimuth: 210.65

Mexico

Object: Altitude: 24.58 Azimuth: 88.42

Sun: Altitude: -37.26 Azimuth: 137.83

Moon: Altitude: 25.00 Azimuth: 296.68

Ural

Object: Altitude: -7.03 Azimuth: 236.79

Sun: Altitude: 33.50 Azimuth: 306.53

Moon: Altitude: -19.82 Azimuth: 107.48

Vostryakovo

Object: Altitude: -16.95 Azimuth: 217.16

Sun: Altitude: 23.34 Azimuth: 284.77

Moon: Altitude: -8.12 Azimuth: 88.53

Gal. latitude: 49.229303 Gal. longitude: 17.452438

Dist. to Sun: 77.345401

Dist. to Moon: 123.374244

Moon coord.: (354.785954 d, -7.509673 d)

Sun coord.: (153.016436 d, 11.131682 d)

Lunar disk: 0.964477

Lunar phase: 21.727799

Lunar bright limb: 78.756617

No SN in this field

2025-06-01 06:22:53 (JD 2460827.765891)

Siderial time 1.555577 h

Ra 15:28:31.68 Dec 11:08:06.00
(232.132000d, 11.135000d)

Rise 2025-06-01 16:05:27

Transit 2025-06-01 23:15:47

Set 2025-06-01 06:30:04

Amur

Object: Altitude: -8.89 Azimuth: 240.36

Sun: Altitude: 45.55 Azimuth: 67.11

Moon: Altitude: 50.37 Azimuth: 314.12

Tunka

Object: Altitude: -19.57 Azimuth: 218.43

Sun: Altitude: 56.58 Azimuth: 34.55

Moon: Altitude: 36.53 Azimuth: 288.62

Kislovodsk

Object: Altitude: -30.97 Azimuth: 152.39

Sun: Altitude: 50.01 Azimuth: 289.41

Moon: Altitude: -3.60 Azimuth: 240.72

Tavrida

Object: Altitude: -26.91 Azimuth: 143.87

Sun: Altitude: 43.88 Azimuth: 282.68

Moon: Altitude: -8.22 Azimuth: 234.36

SAAO

Object: Altitude: -43.09 Azimuth: 73.74

Sun: Altitude: 9.19 Azimuth: 236.43

Moon: Altitude: -47.56 Azimuth: 278.68

IAC

Object: Altitude: -0.85 Azimuth: 103.14

Sun: Altitude: 2.18 Azimuth: 246.03

Moon: Altitude: -43.17 Azimuth: 189.44

Argentina

Object: Altitude: 29.70 Azimuth: 127.97

Sun: Altitude: -63.87 Azimuth: 285.12

Moon: Altitude: -46.76 Azimuth: 82.62

Mexico

Object: Altitude: 69.86 Azimuth: 9.15

Sun: Altitude: -35.28 Azimuth: 164.34

Moon: Altitude: 6.42 Azimuth: 107.18

Ural

Object: Altitude: -21.59 Azimuth: 172.74

Sun: Altitude: 50.93 Azimuth: 323.56

Moon: Altitude: 11.47 Azimuth: 254.52

Vostryakovo

Object: Altitude: -19.30 Azimuth: 150.15

Sun: Altitude: 42.66 Azimuth: 295.86

Moon: Altitude: -0.17 Azimuth: 236.73

Gal. latitude: 49.229303 Gal. longitude: 17.452438

Dist. to Sun: 142.878569

Dist. to Moon: 86.718663

Moon coord.: (141.980530 d, 18.008688 d)

Sun coord.: (69.082850 d, 22.054349 d)

Lunar disk: 0.313381

Lunar phase: 111.915487

Lunar bright limb: 287.168278

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, 2002-2025