GCN Circular 44609

Subject
Fermi GRB 260514A: Global MASTER-Net observations report
Event
GRB 260514A
Date
2026-05-14T11:15:36Z (6 days ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, 
G.Antipov,  A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU),
O.Gress, N.Budnev (ISU),
C.Francile,  F. Podesta, R.Podesta, E. Gonzalez  (Observatorio Astronomico Felix Aguilar (OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A.Sosnovskij (CrAO),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity),
D.Buckley (SAAO),
R.Rebolo (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) 

MASTER-OAFA robotic telescope  [1]  located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 260514A ( Fermi GBM team, GCN 44604Loading...
 
 ) errorbox  19843 sec after notice time and 19904 sec after trigger time at 2026-05-14 10:28:25 UT, with upper limit up to  17.1 mag. Observations started at twilight.  The observations began at zenith distance = 71 deg. The sun  altitude  is -10.0 deg. 

The galactic latitude b = 15 deg., longitude l = 334 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3313250

We obtain a following upper limits.  

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

   19935 | 2026-05-14 10:28:25 |         MASTER-OAFA | (15h 23m 20.52s , -37d 30m 31.8s) |   C |    60 | 16.6 |        
   20013 | 2026-05-14 10:29:43 |         MASTER-OAFA | (15h 23m 26.39s , -37d 31m 33.2s) |   C |    60 | 17.1 |        
   20088 | 2026-05-14 10:30:58 |         MASTER-OAFA | (15h 23m 19.45s , -39d 52m 36.3s) |   C |    60 | 17.1 |        
   20165 | 2026-05-14 10:32:15 |         MASTER-OAFA | (15h 23m 25.28s , -39d 52m 31.6s) |   C |    60 | 17.1 |        
   20244 | 2026-05-14 10:33:34 |         MASTER-OAFA | (15h 23m 24.08s , -34d 50m 45.0s) |   C |    60 | 16.9 |        
Filter C is a clear (unfiltred) band. 


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

[1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023,  Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp.
http : // www.pereplet.ru/lipunov/625.html