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GCN Circular 37898

Subject
Fermi GRB 241026A: Global MASTER-Net observations report
Date
2024-10-27T00:15:44Z (5 days 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 GRB 241026A ( Fermi GBM team, GCN 37894Not found
 
 
) errorbox  4286 sec after notice time and 4328 sec after trigger time at 2024-10-26 23:54:39 UT, with upper limit up to  18.2 mag. The observations began at zenith distance = 73 deg. The sun  altitude  is -45.5 deg. 

The galactic latitude b = 12 deg., longitude l = 87 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2650323

We obtain a following upper limits.  

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

    4359 | 2024-10-26 23:54:39 |      MASTER-Tavrida | (20h 07m 36.82s , +52d 57m 11.3s) |   C |    60 | 18.0 |        
    4433 | 2024-10-26 23:55:54 |      MASTER-Tavrida | (20h 20m 49.18s , +52d 54m 37.7s) |   C |    60 | 18.2 |        
    4507 | 2024-10-26 23:57:07 |      MASTER-Tavrida | (20h 07m 40.76s , +52d 57m 13.9s) |   C |    60 | 18.1 |        
    4581 | 2024-10-26 23:58:22 |      MASTER-Tavrida | (20h 20m 46.46s , +52d 55m 30.2s) |   C |    60 | 18.1 |        
    4655 | 2024-10-26 23:59:36 |      MASTER-Tavrida | (20h 07m 35.14s , +52d 57m 18.3s) |   C |    60 | 18.0 |        
    4828 | 2024-10-27 00:02:29 |      MASTER-Tavrida | (19h 50m 33.53s , +52d 56m 55.0s) |   C |    60 | 17.8 |        
    4904 | 2024-10-27 00:03:45 |      MASTER-Tavrida | (20h 03m 42.29s , +52d 57m 18.0s) |   C |    60 | 17.9 |        
    4978 | 2024-10-27 00:04:59 |      MASTER-Tavrida | (19h 50m 30.27s , +52d 56m 43.4s) |   C |    60 | 17.8 |        
    5052 | 2024-10-27 00:06:13 |      MASTER-Tavrida | (20h 03m 46.20s , +52d 57m 34.6s) |   C |    60 | 17.9 |        
    5127 | 2024-10-27 00:07:28 |      MASTER-Tavrida | (19h 50m 27.44s , +52d 57m 29.3s) |   C |    60 | 17.7 |        
    5298 | 2024-10-27 00:10:19 |      MASTER-Tavrida | (20h 06m 14.97s , +51d 37m 50.6s) |   C |    60 | 17.8 |        
Filter C is a clear (unfiltred) band. 


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