[vsnet-grb-info 21602] MAGIC detects the GRB 190114C in the TeV energy domain

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23701
SUBJECT: MAGIC detects the GRB 190114C in the TeV energy domain
DATE:    19/01/15 01:56:36 GMT
FROM:    Razmik Mirzoyan at MPI/MAGIC  <Razmik.Mirzoyan at mpp.mpg.de>

R. Mirzoyan (MPP Munich), K. Noda (ICRR University of Tokyo), 

E. Moretti (IFAE Barcelona), A. Berti (University and INFN Torino), 

C. Nigro (DESY Zeuthen), J. Hoang (UCM Madrid), S. Micanovic 

(University of Rijeka), M. Takahashi (ICRR University of Tokyo), 

Y. Chai (MPP Munich), A. Moralejo (IFAE Barcelona) and the MAGIC

Collaboration report:

 

On January 14, 2019, the MAGIC telescopes located at the Observatorio 

Roque de los Muchachos on the Canary island of La Palma, detected 

very-high-energy gamma-ray emission from GRB 190114C (Gropp et al., 

GCN 23688; Tyurina et al., GCN 23690, de Ugarte Postigo et al., GCN 

23692, Lipunov et al. GCN 23693, J. Selsing et al. GCN 23695). 
The observation was triggered by the Swift-BAT alert and it started about 

50s after the Swift T0: 20:57:03.19. 

The GRB data of MAGIC shows a clear excess of gamma-ray events with the 

significance >20 sigma in the first 20 min (starting at T0+50s) for energies


>300GeV. The relatively high detection threshold is due to the large zenith 

angle of observations (~60 deg.) and the presence of partial moon. After 

the first bright flash the source is quickly fading.

The MAGIC point of contact for this burst is R. Mirzoyan
(Razmik.Mirzoyan at mpp.mpg.de). 

Burst Advocate for this burst is K. Noda ( <mailto:nodak at icrr.u-tokyo.ac.jp>
nodak at icrr.u-tokyo.ac.jp)