{
  "bibcode": "2019GCN.25695....1L",
  "body": "The LIGO Scientific Collaboration and the Virgo Collaboration report:\n\nWe identified the compact binary merger candidate S190910d during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2019-09-10 01:26:19.243 UTC (GPS\ntime: 1252113997.243). The candidate was found by the SPIIR [1] and\nMBTAOnline [2] analysis pipelines.\n\nS190910d is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 3.7e-09 Hz, or about one in 8\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S190910d\n\nThe classification of the GW signal, in order of descending\nprobability, is NSBH (98%), Terrestrial (2%), BNS (<1%), BBH (<1%), or\nMassGap (<1%).\n\nAssuming the candidate is astrophysical in origin, there is strong\nevidence for the lighter compact object having a mass < 3 solar masses\n(HasNS: >99%). Using the masses and spins inferred from the signal,\nthere is strong evidence against matter outside the final compact\nobject (HasRemnant: <1%).\n\nOne sky map is available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.fits.gz, an updated localization generated by BAYESTAR\n[3], distributed via GCN notice about 6 minutes after the candidate\n\nFor the bayestar.fits.gz sky map, the 90% credible region is 3829\ndeg2. Marginalized over the whole sky, the a posteriori luminosity\ndistance estimate is 606 +/- 197 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] Qi Chu, PhD Thesis, The University of Western Australia (2017)\n [2] Adams et al. CQG 33, 175012 (2016)\n [3] Singer & Price PRD 93, 024013 (2016)",
  "circularId": 25695,
  "createdOn": 1568082545000,
  "email": "francesca.badaracco@gssi.it",
  "subject": "LIGO/Virgo S190910d: Identification of a GW compact binary merger candidate",
  "submitter": "Francesca Badaracco at GSSI, Ligo/VIRGO  <francesca.badaracco@gssi.it>",
  "eventId": "LIGO/Virgo S190910d"
}