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GCN Circular 37241

Subject
Fermi GRB 240821A: Global MASTER-Net observations report
Date
2024-08-23T03:30:30Z (2 months ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik,  D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(Lomonosov Moscow State University, SAI, Physics Department),

R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),

R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),

D. Buckley
(South African Astronomical Observatory),

O.A. Gress, N.M. Budnev, O.Ershova
(Irkutsk State University, API),

L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez
(INAOE, Guillermo Haro Astrophysics Observatory),

A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),

V. Yurkov, A. Gabovich
(Blagoveschensk Educational State University)

MASTER-Tavrida robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 240821A ( Fermi GBM team, GCN 37219Not found
 
 
) errorbox  1 days 11047 sec after notice time and 1 days 11085 sec after trigger time at 2024-08-22 21:40:48 UT, with upper limit up to  17.0 mag. The observations began at zenith distance = 63 deg. The sun  altitude  is -34.5 deg. 

The galactic latitude b = -64 deg., longitude l = 59 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2570719

We obtain a following upper limits.  

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

   97516 | 2024-08-22 21:40:48 |      MASTER-Tavrida | (23h 06m 54.54s , -17d 17m 48.9s) |   C |    60 | 16.4 |        
   97516 | 2024-08-22 21:40:48 |      MASTER-Tavrida | (23h 06m 50.07s , -17d 13m 08.7s) |   C |    60 | 16.9 |        
   98446 | 2024-08-22 21:56:18 |      MASTER-Tavrida | (23h 06m 53.97s , -17d 18m 53.9s) |   C |    60 | 16.6 |        
   98446 | 2024-08-22 21:56:18 |      MASTER-Tavrida | (23h 06m 50.55s , -17d 13m 54.7s) |   C |    60 | 16.9 |        
   99379 | 2024-08-22 22:11:51 |      MASTER-Tavrida | (23h 06m 50.26s , -17d 19m 26.2s) |   C |    60 | 16.8 |        
   99379 | 2024-08-22 22:11:51 |      MASTER-Tavrida | (23h 06m 47.36s , -17d 14m 28.2s) |   C |    60 | 17.0 |        
  100157 | 2024-08-22 22:24:49 |      MASTER-Tavrida | (22h 59m 52.74s , -14d 45m 47.2s) |   C |    60 | 16.3 |        
  100157 | 2024-08-22 22:24:49 |      MASTER-Tavrida | (22h 59m 49.79s , -14d 41m 23.5s) |   C |    60 | 16.4 |        
  101080 | 2024-08-22 22:40:13 |      MASTER-Tavrida | (22h 59m 50.97s , -14d 46m 12.6s) |   C |    60 | 16.4 |        
  101081 | 2024-08-22 22:40:13 |      MASTER-Tavrida | (22h 59m 50.53s , -14d 50m 04.6s) |   C |    60 | 16.5 |        
  102011 | 2024-08-22 22:55:43 |      MASTER-Tavrida | (22h 59m 45.94s , -14d 45m 08.3s) |   C |    60 | 16.3 |        
  102011 | 2024-08-22 22:55:44 |      MASTER-Tavrida | (22h 59m 42.81s , -14d 40m 49.3s) |   C |    60 | 16.4 |        
  105751 | 2024-08-22 23:58:03 |      MASTER-Tavrida | (23h 00m 04.79s , -16d 05m 00.1s) |   C |    60 | 16.4 |        
  105751 | 2024-08-22 23:58:03 |      MASTER-Tavrida | (23h 00m 02.33s , -16d 00m 42.0s) |   C |    60 | 16.2 |        
  105827 | 2024-08-22 23:59:19 |      MASTER-Tavrida | (23h 08m 17.51s , -16d 05m 57.0s) |   C |    60 | 16.3 |        
  105827 | 2024-08-22 23:59:19 |      MASTER-Tavrida | (23h 08m 15.15s , -16d 01m 38.7s) |   C |    60 | 16.2 |        
  106685 | 2024-08-23 00:13:37 |      MASTER-Tavrida | (23h 00m 05.45s , -16d 05m 25.1s) |   C |    60 | 16.2 |        
  106685 | 2024-08-23 00:13:38 |      MASTER-Tavrida | (23h 00m 02.15s , -16d 00m 54.1s) |   C |    60 | 16.2 |        
  106761 | 2024-08-23 00:14:53 |      MASTER-Tavrida | (23h 08m 19.44s , -16d 06m 20.6s) |   C |    60 | 16.1 |        
  106761 | 2024-08-23 00:14:54 |      MASTER-Tavrida | (23h 08m 16.14s , -16d 01m 49.8s) |   C |    60 | 16.1 |        
  107031 | 2024-08-23 00:19:24 |      MASTER-Tavrida | (23h 02m 49.99s , -13d 31m 59.2s) |   C |    60 | 15.9 |        
  107032 | 2024-08-23 00:19:24 |      MASTER-Tavrida | (23h 02m 49.34s , -13d 36m 11.3s) |   C |    60 | 15.9 |        
  107704 | 2024-08-23 00:30:36 |      MASTER-Tavrida | (23h 00m 07.03s , -16d 07m 23.9s) |   C |    60 | 16.2 |        
  107704 | 2024-08-23 00:30:36 |      MASTER-Tavrida | (23h 00m 10.30s , -16d 11m 14.9s) |   C |    60 | 15.9 |        
  107779 | 2024-08-23 00:31:52 |      MASTER-Tavrida | (23h 08m 19.79s , -16d 08m 03.7s) |   C |    60 | 16.1 |        
  107780 | 2024-08-23 00:31:52 |      MASTER-Tavrida | (23h 08m 22.88s , -16d 11m 53.7s) |   C |    60 | 16.2 |        
  108039 | 2024-08-23 00:36:11 |      MASTER-Tavrida | (23h 02m 40.52s , -13d 33m 20.8s) |   C |    60 | 16.2 |        
  108039 | 2024-08-23 00:36:11 |      MASTER-Tavrida | (23h 02m 43.56s , -13d 37m 10.4s) |   C |    60 | 16.2 |        
Filter C is a clear (unfiltred) band. 


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