{
  "bibcode": "2017GCN.21683....1M",
  "body": "I. Martinez-Castellanos (University of Maryland, College Park) and\nA.J. Smith (University of Maryland, College Park) on behalf of the\nHAWC Collaboration:\n\nHAWC Collaboration performed a follow-up of LIGO trigger G298048. At the\ntime of the trigger no portion of the LV contour was visible to HAWC, so\nno prompt follow-up was possible.\n\nAbout 9hrs after the trigger the LV region transited through the HAWC FOV\n(95% of the probability was covered), albeit with a large zenith angle,\nwhich limits the sensitivity of our observations. There were no >5 sigma\npoints observed during this transit. For a single transit, the 5 sigma\nsensitivity to a power law spectrum with a -2.5 index ranges from\n~2e-11 >1TeV cm^-2 s^-1 (~3 Crab units) at dec=-12 to about 6 times higher\nat the edge of our FOV, dec=-25.\n\nAt the point of the optical counterpart candidate SSS17a/DLT17ck\n(RA=13:09:48.09 DEC=-23:22:53.35) reported by Coulter et al. (LVC GCN\n21529), Allam et al. (LVC GCN 21530), Yang et al. (LVC GCN 21531),\nMelandri et al. (LVC GCN 21532), we obtain an 95% confidence level upper\nlimit for >1TeV assuming a -2.5 spectrum of 1.0e-10 cm^-2 s^-1. These\nobservations were made on 2017-08-17 between 19:57 UT and 23:25 UT with\nculmination 9:00 hrs after the LV trigger.\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\n~2 sr.",
  "circularId": 21683,
  "createdOn": 1503603319000,
  "email": "imc@umd.edu",
  "subject": "LIGO/Virgo G298048: HAWC follow-up",
  "submitter": "Israel Martinez-Castellanos at UMD/HAWC  <imc@umd.edu>",
  "eventId": "LIGO/Virgo G298048"
}