[vsnet-grb-info 23938] Alert from the HAWC Burst Monitor HAWC-191019A

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26037
SUBJECT: Alert from the HAWC Burst Monitor HAWC-191019A
DATE:    19/10/19 20:45:38 GMT
FROM:    Hugo Ayala at Pennsylvania State University  <hgayala at psu.edu>

The HAWC Collaboration (http://www.hawc-observatory.org/collaboration/)
reports:

On October 19, 2019, at 20:11:06.18 UT, HAWC detected a burst signal
from its Burst Monitoring named HAWC-191019A.
This monitor system looks for excesses above the expected background
in time windows of 0.2, 1, 10 and 100 seconds.
This event was found in the 0.2-second time window starting at
the reported trigger time.

The position of the alert is
RA (J200): 217.501deg
Dec (J2000): 25.81 deg
Location uncertainty (68% containment): 0.80 deg (statistical only).

The monitor system found that this alert has a false alarm rate
of 4.6e-3 alert(s) per year. We strongly encourage follow-up
observations of the HAWC alert region.

The initial automated alert is recorded in here:
https://gcn.gsfc.nasa.gov/notices_amon_hawc/8991_1097.amon

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.