{
  "bibcode": "2019GCN.25715....1H",
  "body": "The HAWC Collaboration (https://www.hawc-observatory.org) reports:\n\nThe HAWC Collaboration performed a follow-up of the gravitational wave\ntrigger S190910h (GCN #25707). At the time of the trigger the HAWC\nlocal zenith was oriented towards (RA, Dec) = (19.0 deg, 18.9 deg).\n31% of the GW candidate sky location probability fell within our\nobservable field of view (0-45 deg zenith angle).\n\nWe performed a search for a short timescale emission using 6 sliding\ntime windows (dt = 0.3s, 1s, 3s, 10s, 30s and  100s), shifted forward\nin time by 20% of their width. We searched the 95% probability\ncontainment area in a timescale-dependent time period, from t0-5dt to\nt0+10dt, where t0 is the time of the GW trigger.\n\nNo significant gamma-ray detection above the background was observed.\n\nThe sensitivity of this analysis is greatly dependent on zenith angle,\nranging from 0 deg to 45 deg for the area searched in this\nanalysis. The 5sigma detection sensitivity to a 1s (100s) burst in the\n80-800GeV energy range goes from 1.2e-6 erg/cm^2 to 1.1e-4 erg/cm^2\n(6.4e-6 erg/cm^2 to 5.0e-4 erg/cm^2), depending on the zenith\nangle.\n\nHAWC is a TeV gamma ray water Cherenkov array located in the state of\nPuebla, Mexico. It is sensitive to the energy range ~0.1-100TeV, and\nmonitors 2/3 of the sky every day with an instantaneous field-of-view\nof ~2 sr.",
  "circularId": 25715,
  "createdOn": 1568119800000,
  "email": "imc@umd.edu",
  "subject": "LIGO/Virgo S190910h: No counterpart candidates in HAWC observations",
  "submitter": "Israel Martinez-Castellanos at UMD/HAWC  <imc@umd.edu>",
  "eventId": "LIGO/Virgo S190910h"
}