[vsnet-grb-info 14945] MAGIC upper limit on the transient from SWIFT Trigger 596958

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16239
SUBJECT: MAGIC upper limit on the transient from SWIFT Trigger 596958
DATE:    14/05/09 16:29:45 GMT
FROM:    Razmik Mirzoyan at MPI/MAGIC  <Razmik.Mirzoyan at 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 (Razmik.Mirzoyan at mpp.mpg.de) 
or Alessandro Carosi (alessandro.carosi at oa-roma.inaf.it) and Saverio 
Lombardi (saverio.lombardi at pd.infn.it).

 

This message is quotable in publications

 

-Razmik Mirzoyan, on behalf of the MAGIC Collaboration

 

 

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Regards

                                   ---Razmik Mirzoyan--

-----------------------------------------------

There are more important things in life 

than constantly increasing its speed.

                                 Mahatma Gandhi

-----------------------------------------------

Razmik  Mirzoyan

Senior Astrophysicist

Max-Planck-Institute for Physics

(Werner-Heisenberg-Institute)

Foehringer Ring 6

80805 Munich

Germany

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