[vsnet-grb-info 26903] GRB 201209A: FRAM-Auger optical limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29006
SUBJECT: GRB 201209A: FRAM-Auger optical limit
DATE:    20/12/09 06:50:15 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 30cm robotic telescope FRAM-Auger in Malargue (Argentina) reacted
robotically to the Swift/BAT alert of GRB201209A (Gropp et al., GCNC
29005), starting with a series of 20 s R-band images at 05:45:40 UT, i.e.
48 s post trigger.

We do not detect any new or strongly variable source at or around the
reported X-ray error box in single frames nor in a combined 20 x 20 s image
spanning the
period from 0.8 min to 11.9 min after the initial trigger. The combined
exposure has a 3-sigma limiting magnitude R(Vega) ~ 17.4.