GCN Circular 16238
Subject
VHE gamma-ray observations by MAGIC of SWIFT Trigger 596958
Date
2014-05-09T16:22:01Z (11 years ago)
From
Razmik Mirzoyan at MPI/MAGIC <Razmik.Mirzoyan@mpp.mpg.de>
On 23th April 2014 at 21:08:26 UT, the MAGIC telescopes received a
GRB-like event alert from Swift (D'Elia et al., GCN16158). It was
later pointed out that this event was probably not due to a GRB but
to a flaring star (Xu et al., GCN16159; Drake et al., ATel 6121).
The MAGIC telescopes started observations of the transient event at
21:08:54 UT, about 30s after the alert was received, and
kept collecting data for the next 3.3h.
Data were taken in dark-night and under excellent weather conditions,
at medium-low zenith angles (below 45deg).
A preliminary analysis gave an integral flux upper limit of 1.2e-11 cm-2 s-1
above E>200 GeV at 95% c.l., corresponding to 5.3% of the Crab Nebula flux
above 200 GeV, assuming a Crab-like spectral index. The intra-minute light-curve
above 200 GeV did not show any hint of transient signal.
The MAGIC collaboration is open to collaborate with other teams on this
observation.
MAGIC is a system of two 17m-diameter Imaging Atmospheric Cherenkov
Telescopes located at the Canary island of La Palma, Spain, and
designed to perform gamma-ray astronomy in the energy range from 50
GeV to more than 50 TeV. Questions regarding the MAGIC observations
should be directed to Razmik Mirzoyan ([1]Razmik.Mirzoyan@mpp.mpg.de)
or Alessandro Carosi ([2]alessandro.carosi@oa-roma.inaf.it) and
Saverio Lombardi ([3]saverio.lombardi@pd.infn.it).
This message is quotable in publications
-Razmik Mirzoyan, on behalf of the MAGIC Collaboration