MAGIC follow-up observations of IceCube neutrino event 160731A
ATel #9315; Razmik Mirzoyan (Max-Planck-Institute for Physics, Munich), on behalf of the MAGIC collaboration
on 4 Aug 2016; 12:24 UT
Credential Certification: Razmik Mirzoyan (Razmik.Mirzoyan@mpp.mpg.de)
Subjects: Gamma Ray, TeV, VHE, Neutrinos, Transient
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.
