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GCN Circular 34921

Subject
Fermi trigger No 720415645: Global MASTER-Net observations report
Date
2023-10-31T18:15:51Z (a year 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 GRB231031.14 (trigger No 720415645,10h 20m 52.80s , -77d 30m 36.0s, R=8.59) errorbox  51708 sec after notice time and 51745 sec after trigger time at 2023-10-31 17:49:46 UT, with upper limit up to  15.1 mag. Observations started at twilight.  The observations began at zenith distance = 69 deg. The sun  altitude  is -10.2 deg. 

The galactic latitude b = -17 deg., longitude l = 295 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2293539

We obtain a following upper limits.  

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

   51776 | 2023-10-31 17:49:46 |         MASTER-SAAO | (09h 52m 09.44s , -78d 30m 02.3s) |   C |    60 | 14.6 |        
   51866 | 2023-10-31 17:51:16 |         MASTER-SAAO | (10h 31m 40.28s , -78d 29m 40.8s) |   C |    60 | 13.9 |        
   52037 | 2023-10-31 17:54:07 |         MASTER-SAAO | (10h 08m 57.73s , -76d 36m 12.9s) |   C |    60 | 14.6 |        
   52128 | 2023-10-31 17:55:38 |         MASTER-SAAO | (10h 39m 45.58s , -76d 34m 21.4s) |   C |    60 | 13.6 |        
   52208 | 2023-10-31 17:56:58 |         MASTER-SAAO | (11h 09m 45.42s , -76d 32m 15.4s) |   C |    60 | 14.7 |        
   52378 | 2023-10-31 17:59:48 |         MASTER-SAAO | (10h 45m 55.31s , -74d 40m 47.5s) |   C |    60 | 14.4 |        
   52475 | 2023-10-31 18:01:25 |         MASTER-SAAO | (09h 47m 01.87s , -78d 29m 16.3s) |   C |    60 | 15.1 |        
Filter C is a clear (unfiltred) band. 


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