TITLE:   GCN CIRCULAR
NUMBER:  37048
SUBJECT: Fermi GRB 240805A: Global MASTER-Net observations report
DATE:    24/08/05 17:15:29 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 240805A ( Fermi GBM team, GCN 37031) errorbox  53052 sec after notice time and 53084 sec after trigger time at 2024-08-05 16:47:04 UT, with upper limit up to  18.5 mag. Observations started at twilight.  The observations began at zenith distance = 33 deg. The sun  altitude  is -9.3 deg. 

The galactic latitude b = 10 deg., longitude l = 303 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2551244

We obtain a following upper limits.  

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

   53174 | 2024-08-05 16:47:04 |         MASTER-SAAO | (12h 43m 20.61s , -53d 36m 01.3s) |   C |   180 | 16.1 |        
   53354 | 2024-08-05 16:47:04 |         MASTER-SAAO | (12h 43m 20.63s , -53d 36m 01.3s) |   C |   540 | 17.2 |  Coadd 
   53373 | 2024-08-05 16:50:23 |         MASTER-SAAO | (12h 43m 15.26s , -53d 36m 55.1s) |   C |   180 | 16.9 |        
   53573 | 2024-08-05 16:53:42 |         MASTER-SAAO | (12h 43m 23.40s , -53d 36m 25.3s) |   C |   180 | 17.4 |        
   53772 | 2024-08-05 16:57:02 |         MASTER-SAAO | (12h 43m 20.45s , -53d 34m 46.4s) |   C |   180 | 17.9 |        
   53971 | 2024-08-05 17:00:21 |         MASTER-SAAO | (12h 43m 21.17s , -53d 36m 24.1s) |   C |   180 | 18.2 |        
   54171 | 2024-08-05 17:03:41 |         MASTER-SAAO | (12h 43m 24.63s , -53d 34m 49.4s) |   C |   180 | 18.5 |        
Filter C is a clear (unfiltred) band. 


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