GCN Circular 32873
Subject
GRB 221027B: FRAM-ORM and Ondrejov SBT optical limits
Date
2022-10-28T12:45:08Z (2 years ago)
From
Martin Jelinek at Astro.Inst-AVCR,Ondrejov <martin.jelinek@asu.cas.cz>
Martin Jelinek, Jan Strobl, Rene Hudec and Cyril Polasek
(ASU CAS Ondrejov, CZ),
Sergey Karpov, Martin Masek, Petr Janecek, Jakub Jurysek,
Jan Ebr, Ronan Cunniffe, Petr Travnicek and Michael Prouza
(Institute of Physics, Prague, CZ)
report:
The 2x20cm robotic telescope BART-SBT in Ondrejov (CZ) reacted robotically
to the Swift alert of GRB221027B (Lien et al., GCNC 32867 and Perri et al.
GCNC 32870, GCNC 29119 and 29124), obtaining a series of 12s unfiltered
frames at 19:19:46 UT, i.e. 367s post trigger.
The 25cm robotic telescope FRAM-ORM at La Palma (Spain) reacted to the same
alert, providing a series of 60s unfiltered images from 19:28:20 UT, i.e.
882s post trigger.
Similarly to Hu et al. (GCNC 32869) and Lipunov et al. (GCNC 32871), we do
not detect any new or strongly variable source neither in single or in
combined frames with the following limits:
Tel. T-T0[mid,s] Texp[s] Limit[ABmag] Note
SBT 374 12 <15.5 (similar during the following
30 min)
SBT 494 240 <17.0
SBT 674 600 <17.3
SBT 1574 2400 <17.7
FRAM 912 60 <17.0 (similar next 60 minutes)
FRAM 1238 10x60 <18.0