GCN Circular 44012

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 GRB260314.53 (trigger No 795185313,14h 23m 00.00s , -11d 19m 58.8s, R=50) errorbox  48826 sec after notice time and 48862 sec after trigger time at 2026-03-15 02:22:50 UT, with upper limit up to  20.4 mag. The observations began at zenith distance = 45 deg. The sun  altitude  is -42.8 deg. 

The galactic latitude b = 45 deg., longitude l = 337 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3186061

We obtain a following upper limits.  

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

   48883 | 2026-03-15 02:22:50 |         MASTER-OAFA | (11h 42m 55.30s , -01d 47m 48.0s) |   C |    40 | 19.7 |        
   48943 | 2026-03-15 02:22:50 |         MASTER-OAFA | (11h 42m 55.30s , -01d 47m 48.0s) |   C |   160 | 20.4 |  Coadd 
   48934 | 2026-03-15 02:23:36 |         MASTER-OAFA | (11h 42m 55.23s , -01d 47m 46.9s) |   C |    50 | 19.8 |        
   48999 | 2026-03-15 02:24:32 |         MASTER-OAFA | (11h 42m 55.19s , -01d 47m 45.7s) |   C |    70 | 19.9 |        
   49081 | 2026-03-15 02:25:48 |         MASTER-OAFA | (11h 42m 55.10s , -01d 47m 45.0s) |   C |    80 | 19.9 |        
   49191 | 2026-03-15 02:25:48 |         MASTER-OAFA | (11h 42m 55.10s , -01d 47m 45.0s) |   C |   300 | 20.0 |  Coadd 
   49177 | 2026-03-15 02:27:15 |         MASTER-OAFA | (11h 42m 54.96s , -01d 47m 43.8s) |   C |   100 | 20.0 |        
   49293 | 2026-03-15 02:29:01 |         MASTER-OAFA | (11h 42m 54.80s , -01d 47m 42.7s) |   C |   120 | 20.1 |        
   49429 | 2026-03-15 02:31:07 |         MASTER-OAFA | (11h 42m 54.61s , -01d 47m 41.6s) |   C |   140 | 20.2 |        
   49544 | 2026-03-15 02:31:07 |         MASTER-OAFA | (11h 42m 54.61s , -01d 47m 41.6s) |   C |   370 | 20.0 |  Coadd 
   49590 | 2026-03-15 02:33:33 |         MASTER-OAFA | (11h 42m 54.38s , -01d 47m 40.7s) |   C |   170 | 20.3 |        
   49711 | 2026-03-15 02:36:29 |         MASTER-OAFA | (11h 42m 54.21s , -01d 47m 40.3s) |   C |    60 | 19.8 |        
   49777 | 2026-03-15 02:37:35 |         MASTER-OAFA | (11h 42m 54.10s , -01d 47m 40.2s) |   C |    60 | 19.9 |        
   49837 | 2026-03-15 02:37:35 |         MASTER-OAFA | (11h 42m 54.10s , -01d 47m 40.1s) |   C |   180 | 20.4 |  Coadd 
   49843 | 2026-03-15 02:38:40 |         MASTER-OAFA | (11h 42m 54.00s , -01d 47m 39.9s) |   C |    60 | 19.9 |        
   49909 | 2026-03-15 02:39:47 |         MASTER-OAFA | (11h 42m 53.89s , -01d 47m 39.7s) |   C |    60 | 19.9 |        
   49974 | 2026-03-15 02:40:52 |         MASTER-OAFA | (11h 42m 53.81s , -01d 47m 39.7s) |   C |    60 | 19.9 |        
   50034 | 2026-03-15 02:40:52 |         MASTER-OAFA | (11h 42m 53.81s , -01d 47m 39.7s) |   C |   180 | 20.4 |  Coadd 
   50040 | 2026-03-15 02:41:57 |         MASTER-OAFA | (11h 42m 53.70s , -01d 47m 39.5s) |   C |    60 | 19.8 |        
   50106 | 2026-03-15 02:43:04 |         MASTER-OAFA | (11h 42m 53.59s , -01d 47m 39.7s) |   C |    60 | 19.9 |        
   50172 | 2026-03-15 02:44:10 |         MASTER-OAFA | (11h 42m 53.49s , -01d 47m 39.9s) |   C |    60 | 19.9 |        
   50232 | 2026-03-15 02:44:10 |         MASTER-OAFA | (11h 42m 53.49s , -01d 47m 39.9s) |   C |   180 | 20.4 |  Coadd 
   50237 | 2026-03-15 02:45:15 |         MASTER-OAFA | (11h 42m 53.37s , -01d 47m 40.1s) |   C |    60 | 19.9 |        
   50304 | 2026-03-15 02:46:21 |         MASTER-OAFA | (11h 42m 53.26s , -01d 47m 40.2s) |   C |    60 | 19.8 |        
   50369 | 2026-03-15 02:47:27 |         MASTER-OAFA | (11h 42m 53.14s , -01d 47m 40.1s) |   C |    60 | 19.9 |        
   50429 | 2026-03-15 02:47:27 |         MASTER-OAFA | (11h 42m 53.14s , -01d 47m 40.1s) |   C |   180 | 20.0 |  Coadd 
   50434 | 2026-03-15 02:48:32 |         MASTER-OAFA | (11h 42m 53.02s , -01d 47m 40.5s) |   C |    60 | 19.9 |        
   50500 | 2026-03-15 02:49:38 |         MASTER-OAFA | (11h 42m 52.89s , -01d 47m 40.4s) |   C |    60 | 19.9 |        
   50566 | 2026-03-15 02:50:44 |         MASTER-OAFA | (11h 42m 52.77s , -01d 47m 40.4s) |   C |    60 | 19.9 |        
   50626 | 2026-03-15 02:50:44 |         MASTER-OAFA | (11h 42m 52.77s , -01d 47m 40.4s) |   C |   180 | 20.4 |  Coadd 
   50632 | 2026-03-15 02:51:49 |         MASTER-OAFA | (11h 42m 52.64s , -01d 47m 40.6s) |   C |    60 | 19.9 |        
   50698 | 2026-03-15 02:52:56 |         MASTER-OAFA | (11h 42m 52.47s , -01d 47m 40.8s) |   C |    60 | 19.9 |        
   50764 | 2026-03-15 02:54:02 |         MASTER-OAFA | (11h 42m 52.36s , -01d 47m 41.4s) |   C |    60 | 19.9 |        
   50824 | 2026-03-15 02:54:02 |         MASTER-OAFA | (11h 42m 52.36s , -01d 47m 41.4s) |   C |   180 | 20.0 |  Coadd 
   50829 | 2026-03-15 02:55:07 |         MASTER-OAFA | (11h 42m 52.22s , -01d 47m 41.7s) |   C |    60 | 19.9 |        
   50896 | 2026-03-15 02:56:13 |         MASTER-OAFA | (11h 42m 52.09s , -01d 47m 42.1s) |   C |    60 | 19.9 |        
   50961 | 2026-03-15 02:57:19 |         MASTER-OAFA | (11h 42m 51.92s , -01d 47m 42.9s) |   C |    60 | 19.9 |        
   51021 | 2026-03-15 02:57:19 |         MASTER-OAFA | (11h 42m 51.92s , -01d 47m 42.9s) |   C |   180 | 20.0 |  Coadd 
   51027 | 2026-03-15 02:58:24 |         MASTER-OAFA | (11h 42m 51.79s , -01d 47m 43.3s) |   C |    60 | 19.9 |        
   51093 | 2026-03-15 02:59:31 |         MASTER-OAFA | (11h 42m 51.62s , -01d 47m 43.7s) |   C |    60 | 19.9 |        
   51159 | 2026-03-15 03:00:36 |         MASTER-OAFA | (11h 42m 51.50s , -01d 47m 44.1s) |   C |    60 | 19.9 |        
   51219 | 2026-03-15 03:00:36 |         MASTER-OAFA | (11h 42m 51.50s , -01d 47m 44.0s) |   C |   180 | 20.0 |  Coadd 
   51224 | 2026-03-15 03:01:42 |         MASTER-OAFA | (11h 42m 51.36s , -01d 47m 44.9s) |   C |    60 | 19.9 |        
   51291 | 2026-03-15 03:02:48 |         MASTER-OAFA | (11h 42m 51.20s , -01d 47m 45.9s) |   C |    60 | 19.9 |        
   51356 | 2026-03-15 03:03:54 |         MASTER-OAFA | (11h 42m 51.07s , -01d 47m 46.3s) |   C |    60 | 19.9 |        
   51416 | 2026-03-15 03:03:54 |         MASTER-OAFA | (11h 42m 51.07s , -01d 47m 46.3s) |   C |   180 | 20.0 |  Coadd 
   51421 | 2026-03-15 03:04:59 |         MASTER-OAFA | (11h 42m 50.89s , -01d 47m 46.6s) |   C |    60 | 20.0 |        
   51488 | 2026-03-15 03:06:06 |         MASTER-OAFA | (11h 42m 50.76s , -01d 47m 47.3s) |   C |    60 | 19.9 |        
   51553 | 2026-03-15 03:07:11 |         MASTER-OAFA | (11h 42m 50.58s , -01d 47m 48.2s) |   C |    60 | 19.9 |        
   51613 | 2026-03-15 03:07:11 |         MASTER-OAFA | (11h 42m 50.58s , -01d 47m 48.2s) |   C |   180 | 20.0 |  Coadd 
   51619 | 2026-03-15 03:08:17 |         MASTER-OAFA | (11h 42m 50.44s , -01d 47m 49.1s) |   C |    60 | 19.9 |        
   51686 | 2026-03-15 03:09:24 |         MASTER-OAFA | (11h 42m 50.31s , -01d 47m 49.8s) |   C |    60 | 19.9 |        
   51751 | 2026-03-15 03:10:29 |         MASTER-OAFA | (11h 42m 50.15s , -01d 47m 50.8s) |   C |    60 | 19.9 |        
   51811 | 2026-03-15 03:10:29 |         MASTER-OAFA | (11h 42m 50.15s , -01d 47m 50.8s) |   C |   180 | 20.0 |  Coadd 
   51816 | 2026-03-15 03:11:34 |         MASTER-OAFA | (11h 42m 50.01s , -01d 47m 51.7s) |   C |    60 | 19.9 |        
   51883 | 2026-03-15 03:12:40 |         MASTER-OAFA | (11h 42m 49.85s , -01d 47m 53.2s) |   C |    60 | 19.9 |        
   51948 | 2026-03-15 03:13:46 |         MASTER-OAFA | (11h 42m 49.69s , -01d 47m 53.9s) |   C |    60 | 19.9 |        
   52008 | 2026-03-15 03:13:46 |         MASTER-OAFA | (11h 42m 49.69s , -01d 47m 53.9s) |   C |   180 | 20.0 |  Coadd 
   52014 | 2026-03-15 03:14:51 |         MASTER-OAFA | (11h 42m 49.52s , -01d 47m 54.8s) |   C |    60 | 19.9 |        
   52080 | 2026-03-15 03:15:58 |         MASTER-OAFA | (11h 42m 49.36s , -01d 47m 55.6s) |   C |    60 | 19.9 |        
   52146 | 2026-03-15 03:17:03 |         MASTER-OAFA | (11h 42m 49.19s , -01d 47m 56.2s) |   C |    60 | 19.9 |        
   52206 | 2026-03-15 03:17:03 |         MASTER-OAFA | (11h 42m 49.19s , -01d 47m 56.2s) |   C |   180 | 20.0 |  Coadd 
   52211 | 2026-03-15 03:18:09 |         MASTER-OAFA | (11h 42m 49.02s , -01d 47m 57.7s) |   C |    60 | 19.9 |        
   52277 | 2026-03-15 03:19:14 |         MASTER-OAFA | (11h 42m 48.86s , -01d 47m 58.8s) |   C |    60 | 19.9 |        
   52342 | 2026-03-15 03:20:20 |         MASTER-OAFA | (11h 42m 48.71s , -01d 48m 00.4s) |   C |    60 | 19.9 |        
   52408 | 2026-03-15 03:21:26 |         MASTER-OAFA | (11h 42m 48.52s , -01d 48m 01.7s) |   C |    60 | 19.9 |        
   52474 | 2026-03-15 03:22:32 |         MASTER-OAFA | (11h 42m 48.36s , -01d 48m 02.8s) |   C |    60 | 19.9 |        
   52540 | 2026-03-15 03:23:37 |         MASTER-OAFA | (11h 42m 48.20s , -01d 48m 04.0s) |   C |    60 | 19.9 |        
   52605 | 2026-03-15 03:24:43 |         MASTER-OAFA | (11h 42m 48.01s , -01d 48m 05.0s) |   C |    60 | 19.9 |        
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