{
  "bibcode": "2020GCN.27042....1L",
  "body": "The LIGO Scientific Collaboration and the Virgo Collaboration report:\n\nWe identified the compact binary merger candidate S200213t during\nreal-time processing of data from LIGO Hanford Observatory (H1), LIGO\nLivingston Observatory (L1), and Virgo Observatory (V1) at 2020-02-13\n04:10:40.328 UTC (GPS time: 1265602258.328). The candidate was found\nby the GstLAL [1] analysis pipeline.\n\nS200213t is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 1.8e-08 Hz, or about one in 1\nyear, 9 months. The event's properties can be found at this URL:\nhttps://gracedb.ligo.org/superevents/S200213t\n\nThe classification of the GW signal, in order of descending\nprobability, is BNS (63%), Terrestrial (37%), BBH (<1%), MassGap\n(<1%), or NSBH (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object has a mass < 3 solar masses (HasNS) is\n>99%. Using the masses and spins inferred from the signal, the\nprobability of matter outside the final compact object (HasRemnant) is\n>99%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.fits.gz,0, an initial localization generated by BAYESTAR\n[2], distributed via GCN notice about 2 minutes after the candidate\nevent time.\n * bayestar.fits.gz,1, an initial localization generated by BAYESTAR\n[2], distributed via GCN notice about 7 minutes after the candidate\nevent time.\n\nThe preferred sky map at this time is bayestar.fits.gz,1. For the\nbayestar.fits.gz,1 sky map, the 90% credible region is 2587 deg2.\nMarginalized over the whole sky, the a posteriori luminosity distance\nestimate is 224 +/- 90 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo Public Alerts User Guide\n<https://emfollow.docs.ligo.org/userguide/>.\n\n [1] Messick et al. PRD 95, 042001 (2017)\n [2] Singer & Price PRD 93, 024013 (2016)",
  "circularId": 27042,
  "createdOn": 1581568565000,
  "email": "leo.p.singer@nasa.gov",
  "subject": "LIGO/Virgo S200213t: Identification of a GW compact binary merger candidate",
  "submitter": "Leo Singer at GSFC  <leo.p.singer@nasa.gov>",
  "eventId": "LIGO/Virgo S200213t"
}