{
  "bibcode": "2020GCN.27388....1L",
  "body": "The LIGO Scientific Collaboration and the Virgo Collaboration report:\n\nWe identified the compact binary merger candidate S200316bj during\nreal-time processing of data from LIGO Hanford Observatory (H1), LIGO\nLivingston Observatory (L1), and Virgo Observatory (V1) at 2020-03-16\n21:57:56.157 UTC (GPS time: 1268431094.157). The candidate was found\nby the GstLAL [1], MBTAOnline [2], and SPIIR [3] analysis pipelines.\n\nS200316bj is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 7.1e-11 Hz, or about one in 1e3\nyears. The event's properties can be found at this URL:\nhttps://gracedb.ligo.org/superevents/S200316bj\n\nThe classification of the GW signal, in order of descending\nprobability, is MassGap (>99%), Terrestrial (<1%), BNS (<1%), BBH\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[4], distributed via GCN notice about 3 minutes after the candidate\nevent time.\n * bayestar.fits.gz,1, an initial localization generated by BAYESTAR\n[4], distributed via GCN notice about 9 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 1117 deg2.\nMarginalized over the whole sky, the a posteriori luminosity distance\nestimate is 1222 +/- 340 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] Adams et al. CQG 33, 175012 (2016)\n [3] Qi Chu, PhD Thesis, The University of Western Australia (2017)\n [4] Singer & Price PRD 93, 024013 (2016)",
  "circularId": 27388,
  "createdOn": 1584397686000,
  "email": "deep@uwm.edu",
  "subject": "LIGO/Virgo S200316bj: Identification of a GW compact binary merger candidate",
  "submitter": "Deep Chatterjee at University of Wisconsin, Milwaukee  <deep@uwm.edu>",
  "eventId": "LIGO/Virgo S200316bj"
}