TITLE:   GCN CIRCULAR
NUMBER:  42063
SUBJECT: GRB 251002A: FRAM-ORM afterglow detection
DATE:    25/10/02 21:58:23 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
to the alert of GRB251002A (Saccardi et al. GCN 42060), obtaining
a series of unfiltered images starting at 20:25:24 UT, i.e.
~10.5min post trigger. 

We clearly detect the optical transient reported by Palmerio et
al. (GCN 42061) and Turpin et al. (GCN 42062). At the combination
of 9 x 60 s images (Tmid=T0+23.5min) we measure the optical
afterglow with the brightness r = 17.8 +/- 0.2 (AB) as calibrated
against Atlas-REFCAT (Tonry et al. 2018, ApJ, 867, 105).