TITLE:   GCN CIRCULAR
NUMBER:  38037
SUBJECT: GRB 241101A: FRAM-ORM optical limit
DATE:    24/11/02 00:15:14 GMT
FROM:    Martin Jelinek at Astro.Inst-AVCR,Ondrejov <martin.jelinek@asu.cas.cz>

Martin Jelinek and Jan Strobl (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 25cm robotic telescope FRAM-ORM at La Palma (Spain) reacted robotically to the Swift/BAT alert of GRB241101A (Parsotan et al., GCNC 38025, Lien et al., GCNC 38033), obtaining a series of unfiltered images starting at 05:42:20.6 UT, i.e. 35s post trigger.

The observation sequence consisted of 40x20s exposures followed by 30x60s exposures, covering a field of view of 30 arcmin centered on the BAT position. We do not detect any new or strongly variable source in single or combined images. A deep combined image of all data taken during the first hour of follow-up (characteristic time T0+1.4ks), calibrated against Gaia DR3, reaches a 3-sigma limiting magnitude of G > 20.2 (AB).