[vsnet-grb-info 42460] EP260417a: Global MASTER-Net observations report

18 Apr 2026

      TITLE:   GCN CIRCULAR
NUMBER:  44338
SUBJECT: EP260417a: Global MASTER-Net observations report
DATE:    26/04/18 09:45:27 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

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) was pointed to the EP260417a ( EP Team et al., GCN 44325) errorbox 12831 sec after trigger time at 2026-04-17 03:56:53 UT, with upper limit up to  19.9 mag. The observations began at zenith distance = 45 deg. The sun  altitude  is -67.6 deg. 

MASTER-OAGH robotic telescope  located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) was pointed to the EP260417a errorbox  78480 sec after notice time and 1 days 33084 sec after trigger time at 2026-04-18 09:34:26 UT, with upper limit up to  19.2 mag. The observations began at zenith distance = 53 deg. The sun  altitude  is -36.9 deg. 

The galactic latitude b = 19 deg., longitude l = 355 deg.

Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3256324

We obtain a following upper limits.  

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

    4312 | 2026-04-17 01:34:24 |             MASTER- | (16h 25m 32.78s , -22d 27m 07.0s) |   C |    60 | 16.8 |        
   12861 | 2026-04-17 03:56:53 |         MASTER-OAFA | (16h 22m 03.10s , -23d 33m 17.7s) |   C |    60 | 18.9 |        
   12921 | 2026-04-17 03:56:53 |         MASTER-OAFA | (16h 22m 03.09s , -23d 33m 17.9s) |   C |   180 | 19.7 |  Coadd 
   13013 | 2026-04-17 03:59:24 |         MASTER-OAFA | (16h 22m 05.31s , -23d 31m 13.7s) |   C |    60 | 19.5 |        
   13243 | 2026-04-17 04:03:14 |         MASTER-OAFA | (16h 22m 01.68s , -23d 31m 04.9s) |   C |    60 | 19.4 |        
   13395 | 2026-04-17 04:05:46 |         MASTER-OAFA | (16h 22m 02.65s , -23d 33m 00.6s) |   C |    60 | 19.5 |        
   13455 | 2026-04-17 04:05:46 |         MASTER-OAFA | (16h 22m 02.65s , -23d 33m 00.5s) |   C |   180 | 19.9 |  Coadd 
   15146 | 2026-04-17 04:34:57 |         MASTER-OAFA | (16h 22m 04.82s , -23d 30m 29.9s) |   C |    60 | 19.6 |        
   15221 | 2026-04-17 04:36:12 |         MASTER-OAFA | (16h 22m 04.76s , -23d 32m 06.6s) |   C |    60 | 19.7 |        
   15297 | 2026-04-17 04:37:28 |         MASTER-OAFA | (16h 22m 07.64s , -23d 30m 28.6s) |   C |    60 | 19.6 |        
   15357 | 2026-04-17 04:37:28 |         MASTER-OAFA | (16h 22m 07.64s , -23d 30m 28.6s) |   C |   180 | 19.9 |  Coadd 
   15613 | 2026-04-17 04:42:44 |         MASTER-OAFA | (16h 22m 02.17s , -23d 31m 58.9s) |   C |    60 | 19.5 |        
   15688 | 2026-04-17 04:43:59 |         MASTER-OAFA | (16h 22m 07.18s , -23d 31m 53.2s) |   C |    60 | 19.5 |        
   15766 | 2026-04-17 04:45:17 |         MASTER-OAFA | (16h 22m 04.70s , -23d 30m 07.5s) |   C |    60 | 19.4 |        
   15826 | 2026-04-17 04:45:17 |         MASTER-OAFA | (16h 22m 04.69s , -23d 30m 07.5s) |   C |   180 | 19.9 |  Coadd 
   17894 | 2026-04-17 05:20:45 |         MASTER-OAFA | (16h 22m 01.37s , -23d 29m 11.6s) |   C |    60 | 19.6 |        
   17967 | 2026-04-17 05:21:59 |         MASTER-OAFA | (16h 22m 07.83s , -23d 30m 10.7s) |   C |    60 | 19.6 |        
   18047 | 2026-04-17 05:23:18 |         MASTER-OAFA | (16h 22m 00.60s , -23d 31m 09.3s) |   C |    60 | 19.6 |        
   18107 | 2026-04-17 05:23:18 |         MASTER-OAFA | (16h 22m 00.60s , -23d 31m 09.3s) |   C |   180 | 19.5 |  Coadd 
   18354 | 2026-04-17 05:28:26 |         MASTER-OAFA | (16h 22m 07.10s , -23d 29m 32.0s) |   C |    60 | 19.2 |        
   18433 | 2026-04-17 05:29:44 |         MASTER-OAFA | (16h 22m 02.40s , -23d 30m 03.3s) |   C |    60 | 18.9 |        
   18509 | 2026-04-17 05:31:00 |         MASTER-OAFA | (16h 22m 00.62s , -23d 29m 01.8s) |   C |    60 | 18.9 |        
   18569 | 2026-04-17 05:31:00 |         MASTER-OAFA | (16h 22m 00.62s , -23d 29m 01.9s) |   C |   180 | 19.4 |  Coadd 
   21141 | 2026-04-17 06:14:52 |         MASTER-OAFA | (16h 22m 06.99s , -23d 29m 57.4s) |   C |    60 | 19.3 |        
   21216 | 2026-04-17 06:16:08 |         MASTER-OAFA | (16h 22m 01.94s , -23d 30m 56.8s) |   C |    60 | 19.2 |        
   21290 | 2026-04-17 06:17:21 |         MASTER-OAFA | (16h 22m 08.44s , -23d 30m 33.6s) |   C |    60 | 19.3 |        
   21350 | 2026-04-17 06:17:21 |         MASTER-OAFA | (16h 22m 08.45s , -23d 30m 33.6s) |   C |   180 | 19.6 |  Coadd 
   21365 | 2026-04-17 06:18:36 |         MASTER-OAFA | (16h 22m 04.86s , -23d 29m 08.6s) |   C |    60 | 19.2 |        
   21439 | 2026-04-17 06:19:50 |         MASTER-OAFA | (16h 22m 04.87s , -23d 30m 41.6s) |   C |    60 | 18.7 |        
   21515 | 2026-04-17 06:21:07 |         MASTER-OAFA | (16h 22m 08.53s , -23d 29m 14.9s) |   C |    60 | 19.4 |        
   74895 | 2026-04-17 21:10:46 |             MASTER- | (16h 16m 30.79s , -20d 56m 12.9s) |   C |    60 | 13.1 |        
  110797 | 2026-04-18 07:09:09 |         MASTER-OAFA | (16h 17m 04.14s , -21d 44m 07.5s) |   C |    60 | 19.4 |        
  110874 | 2026-04-18 07:10:25 |         MASTER-OAFA | (16h 25m 34.38s , -21d 45m 27.4s) |   C |    60 | 19.5 |        
  110950 | 2026-04-18 07:11:42 |         MASTER-OAFA | (16h 16m 57.59s , -21d 43m 52.3s) |   C |    60 | 19.5 |        
  111028 | 2026-04-18 07:12:59 |         MASTER-OAFA | (16h 25m 40.71s , -21d 45m 23.9s) |   C |    60 | 19.5 |        
  111103 | 2026-04-18 07:14:15 |         MASTER-OAFA | (16h 16m 57.41s , -21d 45m 48.8s) |   C |    60 | 19.5 |        
  119575 | 2026-04-18 09:34:26 |         MASTER-OAGH | (16h 20m 52.34s , -22d 05m 17.1s) |   C |   180 | 19.2 |        
  119575 | 2026-04-18 09:34:26 |         MASTER-OAGH | (16h 22m 13.44s , -22d 38m 32.3s) |   C |   180 | 19.2 |        
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

View this GCN Circular online at https://gcn.nasa.gov/circulars/44338.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...

GCN Circulars

tags

participants (1)