{
  "bibcode": "2019GCN.26441....1L",
  "body": "The LIGO Scientific Collaboration and the Virgo Collaboration report:\n\nWe identified the compact binary merger candidate S191215w during\nreal-time processing of data from LIGO Hanford Observatory (H1), LIGO\nLivingston Observatory (L1), and Virgo Observatory (V1) at 2019-12-15\n22:30:52.333 UTC (GPS time: 1260484270.333). The candidate was found\nby the GstLAL [1], CWB [2], MBTAOnline [3], and PyCBC Live [4]\nanalysis pipelines.\n\nS191215w is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 1e-09 Hz, or about one in 31\nyears. The event's properties can be found at this URL:\nhttps://gracedb.ligo.org/superevents/S191215w\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), 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[5], distributed via GCN notice about 7 minutes after the candidate\nevent time.\n  * bayestar.fits.gz,1, an initial localization generated by BAYESTAR\n[5], distributed via GCN notice about 15 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 923 deg2.\nMarginalized over the whole sky, the a posteriori luminosity distance\nestimate is 2216 +/- 590 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] Klimenko et al. PRD 93, 042004 (2016)\n  [3] Adams et al. CQG 33, 175012 (2016)\n  [4] Nitz et al. PRD 98, 024050 (2018)\n  [5] Singer & Price PRD 93, 024013 (2016)",
  "circularId": 26441,
  "createdOn": 1576451055000,
  "email": "nelson.christensen@oca.eu",
  "subject": "LIGO/Virgo S191215w: Identification of a GW compact binary merger candidate",
  "submitter": "Nelson Christensen at Obs.de la Cote dAzur,Nice  <nelson.christensen@oca.eu>",
  "eventId": "LIGO/Virgo S191215w"
}