{
  "bibcode": "2017GCN.21759....1M",
  "body": "I. Martinez-Castellanos (University of Maryland, College Park) and A.J.\nSmith (University of Maryland, College Park) on behalf of the HAWC\nCollaboration:\n\nThe HAWC Collaboration performed a follow-up of LIGO trigger G299232. At\nthe time of the trigger the HAWC local zenith was oriented toward (��, ��) =\n(75.0��, 19.0��), so the LV contour had just set in our field of view and no\nprompt follow-up was possible.\n\nWe searched for long time scale emission during the following transit. The\nobservations ranged from T0+28ks to T0+87ks. In total 70% of the\nprobability space was covered. There were no >5 sigma points observed. For\na single transit, the 5 sigma sensitivity to a power law spectrum with a\n-2.5 index ranges from ~1.9e-11 >1TeV cm^-2 s^-1 (~1 Crab unit) at dec=-19\nto about 10 times higher at the edge of our FOV (45�� from zenith).\n\nAt the point of the source reported by Swift/UVOT (RA=01h40m08.55s\nDEC=+34d34'03.6\", LVC GCN 21733) we obtain an 95% confidence level upper\nlimit for >1TeV assuming a -2.5 spectrum of 4.3e-12 cm^-2 s^-1. These\nobservations were made from T0+62ks to T0+85ks.\n\nWe found no significant excess on the error radius corresponding to the\nneutrino reported by IceCube (RA=28.2�� DEC= 44.8��, LVC GCN 21698). For the\nlocation of maximum excess in the error radius we obtain an 95% confidence\nlevel upper limit for >1TeV assuming a -2.5 spectrum of 2.8e-11 cm^-2 s^-1.\nThese observations were made from T0+64ks to T0+86ks.\n\nHAWC is a TeV gamma ray water Cherenkov array located in the state of\nPuebla, Mexico. It is sensitive to the energy range ~0.5-100TeV, and\nmonitors 2/3 of the sky every day with an instantaneous field-of-view of ~2\nsr.",
  "circularId": 21759,
  "createdOn": 1504058606000,
  "email": "imc@umd.edu",
  "subject": "LIGO/Virgo G299232: HAWC follow-up",
  "submitter": "Israel Martinez-Castellanos at UMD/HAWC  <imc@umd.edu>",
  "eventId": "LIGO/Virgo G299232"
}