GCN Circular 43999

Subject
Fermi GRB 260314A: Global MASTER-Net observations report
Event
GRB 260314A
Date
2026-03-14T01:18:37Z (21 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-Kislovodsk robotic telescope  [1]  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 260314A ( Fermi GBM team, GCN 43997Loading...
 
 ) errorbox 83 sec after trigger time at 2026-03-14 01:00:13 UT, with upper limit up to  18.8 mag. The observations began at zenith distance = 28 deg. The sun  altitude  is -26.8 deg. 

The galactic latitude b = 34 deg., longitude l = 92 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3185241

We obtain a following upper limits.  

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

      93 | 2026-03-14 01:00:13 |   MASTER-Kislovodsk | (17h 29m 20.27s , +62d 52m 60.0s) |   C |    20 | 17.8 |        
     134 | 2026-03-14 01:00:54 |   MASTER-Kislovodsk | (17h 29m 20.09s , +62d 53m 03.0s) |   C |    20 | 17.8 |        
     179 | 2026-03-14 01:01:34 |   MASTER-Kislovodsk | (17h 29m 19.85s , +62d 53m 05.9s) |   C |    30 | 18.1 |        
     234 | 2026-03-14 01:02:24 |   MASTER-Kislovodsk | (17h 29m 19.53s , +62d 53m 09.3s) |   C |    40 | 18.4 |        
     300 | 2026-03-14 01:03:25 |   MASTER-Kislovodsk | (17h 29m 19.14s , +62d 53m 12.2s) |   C |    50 | 18.5 |        
     380 | 2026-03-14 01:04:35 |   MASTER-Kislovodsk | (17h 29m 18.64s , +62d 53m 15.1s) |   C |    70 | 18.8 |        
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