TITLE:   GCN CIRCULAR
NUMBER:  37145
SUBJECT: Fermi GRB 240810A: Global MASTER-Net observations report
DATE:    24/08/12 06:30:30 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

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-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) started inspect of the Fermi GRB 240810A ( Fermi GBM team, GCN 37133) errorbox  1 days 25680 sec after notice time and 1 days 25712 sec after trigger time at 2024-08-12 04:15:52 UT, with upper limit up to  17.2 mag. Observations started at twilight.  The observations began at zenith distance = 72 deg. The sun  altitude  is -13.6 deg. 

The galactic latitude b =  6 deg., longitude l = 266 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2557980

We obtain a following upper limits.  

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

  112143 | 2024-08-12 04:15:52 |         MASTER-SAAO | (09h 11m 37.13s , -40d 27m 07.6s) |   C |    60 | 17.2 |        
  112222 | 2024-08-12 04:17:12 |         MASTER-SAAO | (09h 22m 09.16s , -40d 27m 47.6s) |   C |    60 | 16.9 |        
  112301 | 2024-08-12 04:18:31 |         MASTER-SAAO | (09h 07m 31.92s , -42d 21m 54.8s) |   C |    60 | 17.2 |        
  112381 | 2024-08-12 04:19:50 |         MASTER-SAAO | (09h 18m 21.27s , -42d 20m 29.2s) |   C |    60 | 16.9 |        
  112460 | 2024-08-12 04:21:10 |         MASTER-SAAO | (09h 16m 00.63s , -38d 34m 42.0s) |   C |    60 | 16.7 |        
  112539 | 2024-08-12 04:22:29 |         MASTER-SAAO | (09h 26m 21.55s , -38d 34m 07.1s) |   C |    60 | 16.5 |        
  112619 | 2024-08-12 04:23:48 |         MASTER-SAAO | (09h 28m 10.31s , -42d 22m 01.6s) |   C |    60 | 16.8 |        
  112698 | 2024-08-12 04:25:08 |         MASTER-SAAO | (09h 39m 04.60s , -42d 20m 06.3s) |   C |    60 | 16.5 |        
Filter C is a clear (unfiltred) band. 


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