TITLE:   GCN CIRCULAR
NUMBER:  29469
SUBJECT: GRB 210210A: FRAM-ORM afterglow detection
DATE:    21/02/11 07:35:59 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 alert of GRB210210A (Palmer et al GCNC 29444, Goad et al. GCNC
29448, D'Elia et al. GCNC 29452, and Lien et al GCNC 29467), obtaining a
set of 30 x 60 s R-band images starting at 03:37:09.2 UT, i.e. ~97min post
trigger.

We clearly detect the source reported by other telescopes (Lipunov et al.
GCN 29447, Fernandez-Garcia et al. GCNC 28763, de Ugarte Postigo et al GCNC
29450, Breeveld & Laha GCNC 29457, and Strausbaugh & Cucchiara GCNC 29459).
At the sum of all available images (Tmid=T0+113.2min) we measure the
optical afterglow with the brightness R=17.6+-0.2 (Vega) as calibrated
against the Atlas catalogue and Lupton transformations.