{
  "createdOn": 1744203164937,
  "submittedHow": "web",
  "circularId": 40128,
  "format": "text/plain",
  "bibcode": "2025GCN.40128....1A",
  "subject": "AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-250409A",
  "submitter": "Hugo Ayala at Pennsylvania State University <hgayala@psu.edu>",
  "body": "The AMON,  IceCube, and HAWC collaborations report:\n\nThe AMON NuEm stream channel found a coincidence alert from the\nIceCube online neutrino selection + HAWC daily monitoring analysis.\nThe analysis looks for IceCube neutrino events -mostly atmospheric\nin origin- around the position and transit time of a HAWC cluster of\nlikely gamma rays, as identified in the integrated observations from\na single transit, in this case having a duration of 6.06 hours.\n\nThe HAWC transit interval starts from 2025/04/09 04:21:14 UT  to\n2025/04/09 10:39:53 UT. A total of 6.3 hrs of integrated HAWC time. \n\n\nThe location of the coincidence is reported as\nRA (J2000): 212.8 deg\nDec (J2000): 17.2 deg\nLocation uncertainty (50% containment): 0.25 deg (statistical only).\nLocation uncertainty (90% containment): 0.46 deg (statistical only).\n\nThe false alarm rate (FAR) of this coincidence is 1.05 per year.\nWe encourage follow-up observations of the alert region contingent on\nthe availability of resources and interest, given the quoted FAR.\n\nThe source 4FGL J1406.9+1643 is the closest to the best position \nof the coincidence, with a distance of around 1deg. \n\nAMON seeks to perform a real-time correlation analysis of the\nhigh-energy signals across all known astronomical messengers. More\ninformation about AMON can be found in https://www.amon.psu.edu/\nInformation on the IceCube collaboration: http://icecube.wisc.edu/\nInformation on the HAWC collaboration: https://www.hawc-observatory.org\n"
}