{
  "bibcode": "2019GCN.24598....1L",
  "body": "The LIGO Scientific Collaboration and the Virgo Collaboration report:\n\nWe identified the compact binary merger candidate S190519bj during\nreal-time processing of data from LIGO Hanford Observatory (H1), LIGO\nLivingston Observatory (L1), and Virgo Observatory (V1) at 2019-05-19\n15:35:44.398 UTC (GPS time: 1242315362.398). The candidate was found\nby the PyCBC Live [1], CWB [2], GstLAL [3], MBTAOnline [4], and SPIIR\n[5] analysis pipelines.\n\nS190519bj is an event of interest because its false alarm rate, as\ndetermined by the online analysis, is 5.7e-09 Hz, or about one in 5\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S190519bj\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (96%), Terrestrial (4%), BNS (<1%), NSBH (<1%),\nor MassGap (<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 * bayestar.fits.gz, an updated localization generated by BAYESTAR\n[6], distributed via GCN notice about 59 minutes after the candidate\n\nFor the bayestar.fits.gz skymap, the 90% credible region is 967 deg2.\nMarginalized over the whole sky, the a posteriori luminosity distance\nestimate is 3154 +/- 791 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] Nitz et al. PRD 98, 024050 (2018)\n[2] Klimenko et al. PRD 93, 042004 (2016)\n[3] Messick et al. PRD 95, 042001 (2017)\n[4] Adams et al. CQG 33, 175012 (2016)\n[5] Qi Chu, PhD Thesis, The University of Western Australia (2017)\n[6] Singer & Price PRD 93, 024013 (2016)\n\n\nFirma il tuo 5 per mille all'Universit? di Parma e aiuta cos? i nostri studenti che vogliono realizzare un'esperienza di studio all'estero - Indica 00308780345 nella tua denuncia dei redditi.",
  "circularId": 24598,
  "createdOn": 1558285782000,
  "email": "roberto.depietri@unipr.it",
  "subject": "LIGO/Virgo S190519bj: Identification of a GW compact binary merger candidate",
  "submitter": "Roberto De Pietri at LIGO/Virgo  <roberto.depietri@unipr.it>",
  "eventId": "LIGO/Virgo S190519bj"
}