{
  "bibcode": "2020GCN.27278....1L",
  "body": "The LIGO Scientific Collaboration and the Virgo Collaboration report:\n\nWe identified the compact binary merger candidate S200302c during\nreal-time processing of data from LIGO Hanford Observatory\n(H1) and Virgo Observatory (V1) at 2020-03-02 01:58:11.519 UTC (GPS\ntime: 1267149509.519). The candidate was found by the GstLAL [1]\nanalysis pipeline.\n\nS200302c is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 9.3e-09 Hz, or about one in 3\nyears. The event's properties can be found at this URL:\nhttps://gracedb.ligo.org/superevents/S200302c\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (89%), Terrestrial (11%), BNS (<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<1%. Using the masses and spins inferred from the signal, the\nprobability of matter outside the final compact object (HasRemnant) is\n<1%.\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 a minute after the candidate\nevent time.\n * bayestar.fits.gz,1, distributed via GCN notice about 7 minutes after\nthe candidate event time.  (This is identical to bayestar.fits.gz,0 )\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 6704 deg2.\nMarginalized over the whole sky, the a posteriori luminosity distance\nestimate is 1737 +/- 500 Mpc (a posteriori mean +/- standard\ndeviation).\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": 27278,
  "createdOn": 1583115613000,
  "email": "pshawhan@umd.edu",
  "subject": "LIGO/Virgo S200302c: Identification of a GW compact binary merger candidate",
  "submitter": "Peter Shawhan at U of Maryland/LSC  <pshawhan@umd.edu>",
  "eventId": "LIGO/Virgo S200302c"
}