[vsnet-grb-info 26883] GRB 201203A: FRAM-Auger optical limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  28986
SUBJECT: GRB 201203A: FRAM-Auger optical limit
DATE:    20/12/03 08:09:11 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 30 cm robotic telescope FRAM-Auger in Malargue
(Argentina) reacted robotically to the Swift/BAT alert
of GRB201203A (Dichiara et al., GCNC 28985), starting
with a series of 20 s unfiltered images at 06:54:04 UT,
i.e. 97 s post trigger.

We do not detect any new or strongly variable source at
or around the reported gamma-ray errorbox in single
frames or a combined 20 x 20 s image taken between 1.5
min and 12.5 min after the initial trigger. The
combined exposure has a limiting magnitude r'(AB) ~
17, as calibrated against the Atlas Catalogue.