[vsnet-grb-info 26522] Fermi-LAT Gamma-ray Observations of IceCube-201014A
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Thu Oct 15 04:51:16 JST 2020
TITLE: GCN CIRCULAR
NUMBER: 28622
SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-201014A
DATE: 20/10/14 19:50:03 GMT
FROM: Simone Garrappa at DESY <simone.garrappa at desy.de>
S. Garrappa (DESY-Zeuthen) and S. Buson (Univ. of Wuerzburg) on behalf
of the Fermi-LAT collaboration:
We report an analysis of observations of the vicinity of the high-energy
IC201014A neutrino event (GCN 28616) with all-sky survey data from the
Large Area Telescope (LAT), on board the Fermi Gamma-ray Space
Telescope. The IceCube event was detected on 2020-10-14 at 02:13:27.53
UT (T0) with J2000 position RA = 221.22 (+1.00,-0.75) deg, Decl. = 14.44
(+0.67,-0.46) deg 90% PSF containment. No cataloged >100 MeV gamma-ray
sources (The Fourth Fermi-LAT catalog; The Fermi-LAT collaboration 2020,
ApJS, 247, 33) are located within the 90% IC201014A localization error.
We searched for intermediate (days to years) timescale emission from a
new gamma-ray transient source. Preliminary analysis indicates no
significant (> 5 sigma) new excess emission (> 100 MeV) at the
IC201014A best-fit position. Assuming a power-law spectrum (photon index
= 2.0 fixed) for a point source at the IC201014A best-fit position, the
>100 MeV flux upper limit (95% confidence) is < 5.6e-10 ph cm^-2 s^-1
for ~12-years (2008-08-04 / 2020-10-14 UTC), < 6.6e-9 (< 7.1e-8) ph
cm^-2 s^-1 for a 1-month (1-day) integration time before T0.
Since Fermi normally operates in an all-sky scanning mode, regular
monitoring of this source will continue. For these observations the
Fermi-LAT contact persons are S. Garrappa (simone.garrappa at desy.de
<http://desy.de/>) and S. Buson (sara.buson at uni-wuerzburg.de
<http://uni-wuerzburg.de/>). The Fermi-LAT is a pair conversion
telescope designed to cover the energy band from 20 MeV to greater than
300 GeV. It is the product of an international collaboration between
NASA and DOE in the U.S. and many scientific institutions across France,
Italy, Japan and Sweden.
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