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\title{MAGIC observation of the short nearby GRB160821B
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\author{\speaker{Koji Francesco}\\
        IFAE
 
 \\
        E-mail: \email{knoda@mppmu.mpg.de
 longofranz@gmail.com
}}

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\abstract{
  Many of the properties of Gamma Ray Bursts (GRBs) remain poorly understood, particularly for short GRBs with durations less than ~2 sec. Fermi/LAT has shown that some GRBs emit at high-energy (100 MeV - ~100 GeV) gamma-rays with a hard (index of \&lt;2) spectrum. Atmospheric Cherenkov Telescopes (IACTs) could provide information on the possible emission at very-high-energy (VHE, \&gt;100 GeV) gamma-rays. In particular MAGIC telescopes were designed to explore this particular physics case. Although no firm detection has been reported so far, the MAGIC Collaboration reported a hint of a VHE gamma-ray emissions from the short, very nearby (z=0.16) GRB 160821B. Even if it is only a hint, this creates doubts on the the standard expectations for gamma-ray emissions from GRBs: low energy (~30 GeV) over a short period (\&lt;~100 s). Moreover GRB 160821B showed a clear extended emission in the X-ray band, which can be generated by a ms pulsar after a NS-NS or NS-BH merger. In this contribution we will briefly report on the hint of the signal and on possible interpretations of the data assuming that the hint is real.
}

\FullConference{7th Fermi Symposium 2017\\
		15-20 October 2017\\
		Garmisch-Partenkirchen, Germany}


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