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MAGIC follow-up observations of IceCube neutrino event 160731A

The MAGIC collaboration reports results from the follow-up observations of IceCube neutrino HESE/EHE 160731A (AMON GCN notice ; http://gcn.gsfc.nasa.gov/notices_amon/6888376_128290.amon ). Follow up observations from other observatories have been reported (ATels: #9294, #9295, #9298, #9301, #9303, GCN: #19743, #19752, #19758, #19760). MAGIC received the AMON GCN alert on Sun Jul 31 01:55:59 2016 UTC, when the reported sky location was not visible from La Palma. The initial EHE alert coordinates were observed by MAGIC on Sun Jul 31 21:25 - 22:47 UTC, at high zenith angle, 45-65 deg. Because of the 3.5 deg. field of view of the MAGIC cameras, these observations encompassed both the initial and revised IceCube alert positions (as reported in the HESE/EHE AMON GCN alert from Mon 01 Aug 16 02:35:54 UT). No significant VHE gamma-ray emission above 600 GeV was detected within the quoted IceCube 50% containment circle, neither from the initial, nor the revised HESE/EHE alert positions. The energy threshold of the analysis performed was higher than expected for this range of zenith angle because of the presence of a sand layer from the Saharan desert (calima), which somewhat deteriorated the atmospheric conditions during the MAGIC observations. The MAGIC contact persons for these observations are R. Mirzoyan (Razmik.Mirzoyan@mpp.mpg.de), K.Satalecka (konstancja.satalecka@desy.de) and D. Glawion (Dorit.Glawion@astro.uni-wuerzburg.de). 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 greater than 50 TeV.

Gamma Ray ; TeV ; VHE ; Neutrinos ; Transient

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