[ Previous | Next | ADS ]

MAGIC discovers VHE gamma-ray emission from the blazar 1ES 1727+502

ATel #3774; Mose Mariotti (INFN and Univ. of Padova) on behalf of the MAGIC Collaboration
on 19 Nov 2011; 14:19 UT
Credential Certification: Mosè Mariotti (mariotti@pd.infn.it)

Subjects: Gamma Ray, >GeV, TeV, VHE, AGN, Blazar

The MAGIC Collaboration reports the discovery of Very High Energy (VHE; E>100 GeV) gamma-ray emission from the BL Lac object 1ES 1727+502 (also known as OT546) with redshift z=0.055. The source was selected from the compilation of Costamante, L. & Ghisellini, G. 2002, A&A, 384, 56. Previous observations with the single MAGIC-I telescope yielded an upper limit on the level of 11.8% of the Crab Nebula flux above 140 GeV (J. Aleksic et al. (MAGIC Coll.), Astrophys. J. 729 (2010) 115).

A total observation time of 12.5 hours was collected between 2011 May 6th to June 10th in stereoscopic mode with the two 17 m diameter imaging Cherenkov telescopes on La Palma, Canary Islands, Spain. The preliminary analysis of this data using the standard analysis chain yields a detection of 76 gamma-rays above 150 GeV, corresponding to a statistical significance of 5 standard deviations. The observed flux is estimated to be (1.7+/-0.6)% of the Crab Nebula flux above 150 GeV, well below the previous upper limit. Errors are statistical only.

Questions regarding the MAGIC observations should be directed to Mose Mariotti (mose.mariotti@pd.infn.it).