Fermi/LAT search for counterpart to the IceCube event 67093193 (run 127853)
ATel #9008; G. Vianello (Stanford), J. D. Magill (UMD/GSFC), N. Omodei (Stanford), D. Kocevski (NASA/Goddard), M. Ajello (Clemson), S. Buson (NASA/GSFC), F. Krauss (ECAP/FAU), J. Chiang (SLAC/Kipac)
on 28 Apr 2016; 22:34 UT
Credential Certification: Giacomo Vianello (firstname.lastname@example.org)
Subjects: Gamma Ray, >GeV, Neutrinos, AGN, Transient
on behalf of the Fermi-LAT team:
We have searched the Fermi Large Area Telescope data for a high-energy gamma-ray counterpart for
the IceCube High Energy Starting Event (HESE) 67093193, detected in run 127853 on 2016-04-27
05:52:32.00 UT (AMON GCN notice rev. 2, http://gcn.gsfc.nasa.gov/notices_amon/67093193_127853.amon . See http://gcn.gsfc.nasa.gov/doc/Public_Doc_AMON_IceCube_GCN_Alerts_v2.pdf for a description of
HESE events and related GCN notices).
The localization region was outside the LAT field of view at the time of the detection by IceCube
(T0). It entered the LAT FoV at ~T0 + 6140 s and exited again at ~T0 + 8420 s. We ran the standard
GRB search (Vianello et al. 2015) plus an ad-hoc search for a counterpart in this time interval
and in 10 h intervals before and after the event. We found no significant transient candidate
associated with the neutrino event.
The Automated Science Processing search, which looks for variation in flux from known sources
and for new transients on different time scales (Chiang 2012), did not detect any transient
or flaring source consistent with the IceCube event position during the six-hour
intervals before and after the neutrino detection time, nor during the day before and after the
The Fermi All-Sky Variability Analysis (FAVA), a photometric analysis currently designed to
detect variable sources on one-week timescales, did not find any excess emission consistent with
the most current localization. Likewise, an examination of previous weeks analyzed by this
technique reveals no long timecale flaring sources compatible with the localization region.
The 90% containment provided by IceCube, which is ~36 arcmin wide, contains no LAT source from
the Fermi Point Source catalog (3FGL, Acero et al. 2015). The 5 closest sources are all blazars:
|Source name||Distance||Association||Blazar Type|
|3FGL J1603.7+1106||108'||MG1 J160340+1106||BL Lac|
|3FGL J1608.6+1029||117'||4C +10.45||FSRQ|
|3FGL J1555.7+1111||147'||PG 1553+113||BL Lac|
|3FGL J1552.1+0852||153'||TXS 1549+089||BL Lac|
|3FGL J1546.0+0818||249'||1RXS J154604.6+081912||BL Lac|
We note in particular that PG 1553+113 has been detected in high state on 2016-04-27 in the 0.3-10
keV band by the Swift X-ray Telescope (B. Kapanadze, ATel #8998), although we do not detect any significant change in flux above 100 MeV.
The Fermi-LAT points of contact for this event are Giacomo Vianello (Burst Advocate, email@example.com) and Jeffrey D Magill (Flare Advocate, firstname.lastname@example.org).
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.