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GCN Circular 37138

Subject
Fermi trigger No 745057312: Global MASTER-Net observations report
Date
2024-08-11T17:30:28Z (a month 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-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 GRB240811.35 (trigger No 745057312,13h 41m 00.00s , +18d 22m 01.2s, R=29.78) errorbox  30851 sec after notice time and 30873 sec after trigger time at 2024-08-11 16:56:20 UT, with upper limit up to  18.5 mag. Observations started at twilight.  The observations began at zenith distance = 61 deg. The sun  altitude  is -10.5 deg. 

The galactic latitude b = 75 deg., longitude l = 359 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2558490

We obtain a following upper limits.  

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

   30964 | 2024-08-11 16:56:20 |         MASTER-SAAO | (15h 05m 15.61s , +28d 44m 09.2s) |   C |   180 | 16.7 |        
   31144 | 2024-08-11 16:56:20 |         MASTER-SAAO | (15h 05m 15.73s , +28d 44m 09.5s) |   C |   540 | 17.9 |  Coadd 
   31163 | 2024-08-11 16:59:40 |         MASTER-SAAO | (15h 05m 14.56s , +28d 45m 33.6s) |   C |   180 | 17.3 |        
   31366 | 2024-08-11 17:03:03 |         MASTER-SAAO | (15h 05m 15.31s , +28d 44m 20.0s) |   C |   180 | 17.9 |        
   31569 | 2024-08-11 17:06:26 |         MASTER-SAAO | (15h 05m 19.71s , +28d 45m 33.5s) |   C |   180 | 18.0 |        
   31768 | 2024-08-11 17:09:45 |         MASTER-SAAO | (15h 05m 13.13s , +28d 45m 04.3s) |   C |   180 | 18.3 |        
   31968 | 2024-08-11 17:13:05 |         MASTER-SAAO | (15h 05m 14.11s , +28d 46m 10.3s) |   C |   180 | 18.0 |        
   32167 | 2024-08-11 17:16:24 |         MASTER-SAAO | (15h 05m 20.67s , +28d 45m 17.0s) |   C |   180 | 18.5 |        
   32366 | 2024-08-11 17:19:43 |         MASTER-SAAO | (15h 05m 15.35s , +28d 44m 23.6s) |   C |   180 | 18.5 |        
Filter C is a clear (unfiltred) band. 


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