[vsnet-grb-info 24755] GRB 200122A: FRAM-ORM optical limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26854
SUBJECT: GRB 200122A: FRAM-ORM optical limit
DATE:    20/01/22 15:58:16 GMT
FROM:    Martin Jelinek at Astro.Inst-AVCR,Ondrejov  <martin.jelinek at asu.cas.cz>

Martin Jelinek, Jan Strobl (ASU CAS Ondrejov, CZ),
Martin Masek, Petr Janecek, Sergey Karpov, Jakub Jurysek,
Jan Ebr, Ronan Cunniffe, Petr Travnicek and Michael Prouza
(Institute of Physics, Prague, CZ)

report:

The 25cm robotic telescope FRAM-ORM at La Palma (Spain)
reacted robotically to the alert of GRB200122A (Sonbas et
al, GCNC 26844), obtaining a series of 20s unfiltered images
starting at 01:41:33.0UT, i.e. 32.6s post trigger.

We do not detect any new source in comparison to USNO-B2.0
catalog neither in single images (3-sigma limit R>~17.4)
nor in a combined 40x20s frame (mean exp time 551s post
trigger, 3-sigma limit R>~19.3).