HAWC detection of a candidate TeV transient event from 2FHL J1037.6+5710
ATel #11806; Thomas Weisgarber (UW-Madison) for the HAWC Collaboration
on 2 Jul 2018; 21:50 UT
Credential Certification: Colas Riviere (riviere@umd.edu)
Subjects: Gamma Ray, TeV, AGN, Blazar, Variables
The HAWC observatory reports a candidate very high energy gamma-ray transient event coincident with the position of 2FHL J1037.6+5710, a BL Lac object located at (RA, Dec) = (159.414, 57.172) degrees in J2000 coordinates. This event was detected by the HAWC real-time flare monitor (ApJ 843, 116) and has an associated false alarm rate of 0.02 events per year. The corresponding significance of this event has been steadily increasing since UTC 2018-06-29 21:59:00 and reached its present maximum value at UTC 2018-07-01 21:03:18. Although the source is located at an unfavorable declination for HAWC, the low false alarm rate suggests potentially strong VHE transient activity. HAWC will continue to monitor this source. Multiwavelength observations to clarify the nature of the activity are encouraged.
HAWC is a TeV gamma ray water Cherenkov array located in the state of Puebla, Mexico, that monitors two thirds of the sky every day with a field of view of ~2 sr. The HAWC real-time flare monitor searches for transients on time scales from 2 minutes to 2 days from a predefined set of 187 objects that includes TeVCat and 2FHL sources between the declinations of -21 and +59 degrees.
