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GCN Circular 34875

Subject
Fermi trigger No 719846439: Global MASTER-Net observations report
Date
2023-10-24T18:00:53Z (7 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 GRB231024.56 (trigger No 719846439,01h 01m 28.80s , -14d 03m 00.0s, R=12.61) errorbox  15849 sec after notice time and 15886 sec after trigger time at 2023-10-24 17:45:20 UT, with upper limit up to  17.1 mag. The observations began at zenith distance = 67 deg. The sun  altitude  is -32.8 deg. 

The galactic latitude b = -76 deg., longitude l = 136 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2290597

We obtain a following upper limits.  

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

   15916 | 2023-10-24 17:45:20 |      MASTER-Tavrida | (00h 55m 13.90s , -12d 02m 35.2s) |   C |    60 | 15.8 |        
   15988 | 2023-10-24 17:46:32 |      MASTER-Tavrida | (00h 56m 07.17s , -15d 50m 17.9s) |   C |    60 | 13.2 |        
   16063 | 2023-10-24 17:47:47 |      MASTER-Tavrida | (00h 54m 46.43s , -10d 07m 45.2s) |   C |    60 | 16.5 |        
   16211 | 2023-10-24 17:50:15 |      MASTER-Tavrida | (01h 10m 46.64s , -12d 02m 39.5s) |   C |    60 | 15.1 |        
   16284 | 2023-10-24 17:51:28 |      MASTER-Tavrida | (00h 54m 31.58s , -08d 14m 43.3s) |   C |    60 | 17.1 |        
   16433 | 2023-10-24 17:53:57 |      MASTER-Tavrida | (01h 10m 19.74s , -10d 07m 48.6s) |   C |    60 | 16.5 |        
Filter C is a clear (unfiltred) band. 


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