TITLE:   GCN CIRCULAR
NUMBER:  13770
SUBJECT: GRB 120913B: FRAM early follow up and detection
DATE:    12/09/14 13:49:57 GMT
FROM:    Martin Jelinek at Inst.Astrophys.Andalucia,Granada  <mates@iaa.es>

Martin Jelinek (IAA Granada, Spain),
Petr Kubanek, Martin Masek, Jakub Cerny, Jan Ebr and
Michael Prouza (FZU Praha, Czech Rep.)
on behalf of the FRAM team, coordinated by FZU Praha

report:

The 30cm FRAM telescope, located at Pierre Auger
observatory in Malargue, Argentina, followed the GRB
120913B (Helder et al. GCNC13763, Swift trigger
#533613). Observations started 24.4s after the GRB
trigger.

10s R-band (lambda_eff = 640nm) images with a limit of
~16.0 were obtained. We identify the optical transient
reported by LaCluyze et al. (GCNC13764) and Klotz et
al. (GCNC13765) with a magnitude R = 16.3 +/- 0.2 on a
sum of 8x10s images obtained between 271 and 364s after
the GRB.

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