[vsnet-grb-info 26492] IceCube-201007A: No significant detection in HAWC
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Oct 10 03:11:51 JST 2020
TITLE: GCN CIRCULAR
NUMBER: 28592
SUBJECT: IceCube-201007A: No significant detection in HAWC
DATE: 20/10/09 18:10:43 GMT
FROM: Alberto Carraminana at AzTEC <alberto at inaoep.mx>
Alberto Carramiñana (INAOE) reports on behalf of the HAWC
collaboration (http://www.hawc-observatory.org/collaboration):
On 2020/10/07 22:01:49 UTC, the IceCube collaboration reported a
track-like very-high-energy event that has a high probability of
being an astrophysical neutrino, IceCube-201007A. Location is at
RA: 265.17 (+/-0.52 deg 90% PSF containment) J2000
Dec: 5.34 (+0.32/-0.23 deg 90% PSF containment) J2000
(GCN circular 28575).
We performed two types of analyses for the follow-up. The first is for
a steady source in archival data and the second is a search for a
transient source. We assume a power-law spectrum with an index of -2.3
for both analyses.
- Search for a steady source in archival data:
The archival data spans from November 2014 to June 2019. We searched
inside the reported IceCube error region.
The most significant location, with p-value 1.29e-02 (3.70e-02 post-trials),
is at RA 264.86 deg, Dec +5.23 deg (±0.15 deg 68% containment) J2000.
We set a time-integrated 95% CL upper limit on gamma rays at the
maximum position of:
E^2 dN/dE = 2.57e-13 (E/TeV)^-0.3 TeV.cm^-2.s^-1
- Search for a transient source.
The IceCube event was in our field of view at the time reported.
Data acquisition started on 2020/10/07 20:06:38 UTC and ended
2020/10/08 01:58:29 UTC.
The most significant location, with p-value 3.97e-01 (7.71e-01 post-trials),
is at RA 265.25 deg, Dec +5.34 deg (±0.27 deg 68% containment) J2000.
We set a time-integrated 95% CL upper limit at the position of
maximum significance of:
E^2 dN/dE = 6.47e-12 (E/TeV)^-0.3 TeV.cm^-2.s^-1
HAWC is a very-high-energy gamma-ray observatory operating in Central
Mexico at latitude 19 deg. north. Operating day and night with over
95% duty cycle, HAWC has an instantaneous field of view of 2 sr and
surveys 2/3 of the sky every day. It is sensitive to gamma rays from
300 GeV to 100 TeV.
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