GCN Circular 3747
Subject
GCN GRB observation 050713A
Date
2005-08-03T19:30:58Z (19 years ago)
From
Alessandro De Angelis at INFNandUdineU. <deangeli@fisica.uniud.it>
TITLE: GCN GRB OBSERVATION REPORT
SUBJECT: GRB 050713A: Observation at very high energy by MAGIC
N. Galante and Stamerra (INFN/Siena)
D. Bastieri, M. Fagiolini, M. Gaug, M. Garczarczyk, T. Lenisa, F. Longo,
K. Mannheim, S. Mizobuchi, A. Moralejo, R. Paoletti, L. Peruzzo, A Piccioli, S. Shore
on behalf of the MAGIC Collaboration:
"The MAGIC Cherenkov telescope in La Palma has observed GRB050713A 40s after T0.
This observation, started 20 seconds after the alert given
by Swift (Trigger #145675; Falcone et al., GCN Circ 3581), thanks to the
capability of fast pointing by MAGIC and to the prompt reaction by the operators; it
overlapped for around 30 seconds with Swift during the main burst,
and lasted 2400 s. The first look at the MAGIC data did not reveal strong gamma ray
emission above 175GeV. The flux limit derived at very
high energies by MAGIC is 2-3 orders of magnitude lower than the extrapolation from
the X band [1]. A detailed analysis is in progress. To our knowledge, this is the first
simultaneous observation of a GRB in the X band and in the HE gamma region."
[1] A. Falcone, private communication.