{
  "bibcode": "2019GCN.24522....1L",
  "body": "The LIGO Scientific Collaboration and the Virgo Collaboration report:\n\nWe identified the compact binary merger candidate S190513bm during\nreal-time processing of data from LIGO Hanford Observatory (H1), LIGO\nLivingston Observatory (L1), and Virgo Observatory (V1) at 2019-05-13\n20:54:28.747 UTC (GPS time: 1241816086.747). The candidate was found\nby the GstLAL [1], CWB [2], MBTAOnline [3], and spiir [4] analysis\npipelines.\n\nS190513bm is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 3.7e-13 Hz, or about one in 1e5\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S190513bm\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (94%), MassGap (5%), NSBH (<1%), Terrestrial\n(<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, there is strong\nevidence against the lighter compact object having a mass < 3 solar\nmasses (HasNS: <1%). Using the masses and spins inferred from the\nsignal, there is strong evidence against matter outside the final\ncompact object (HasRemnant: <1%).\n\nOne skymap is available at this time and can be retrieved from the\nGraceDB event page:\n\n* bayestar.fits.gz, an updated localization generated by BAYESTAR\n\n[5], distributed via GCN notice about 27 minutes after the candidate\n\nFor the bayestar.fits.gz skymap, the 90% credible region is 691 deg2.\nMarginalized over the whole sky, the a posteriori luminosity distance\nestimate is 1987 +/- 501 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] Qi Chu, PhD Thesis, The University of Western Australia (2017)\n[5] Singer & Price PRD 93, 024013 (2016)",
  "circularId": 24522,
  "createdOn": 1557783444000,
  "email": "marco.drago@gssi.it",
  "subject": "LIGO/Virgo S190513bm: Identification of a GW compact binary merger candidate",
  "submitter": "Marco Drago at GSSI  <marco.drago@gssi.it>",
  "eventId": "LIGO/Virgo S190513bm"
}