{
  "bibcode": "2019GCN.25012....1L",
  "body": "The LIGO Scientific Collaboration and the Virgo Collaboration report:\n\nWe identified the compact binary merger candidate S190707q during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2019-07-07 09:33:26.181 UTC (GPS\ntime: 1246527224.181). The candidate was found by the MBTAOnline [1],\nCWB [2], GstLAL [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS190707q is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 5.3e-12 Hz, or about one in 1e4\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S190707q\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), 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 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[6], distributed via GCN notice about 39 minutes after the candidate\n\nFor the bayestar.fits.gz sky map, the 90% credible region is 1375\ndeg2. Marginalized over the whole sky, the a posteriori luminosity\ndistance estimate is 810 +/- 234 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] Adams et al. CQG 33, 175012 (2016)\n ��[2] Klimenko et al. PRD 93, 042004 (2016)\n ��[3] Messick et al. PRD 95, 042001 (2017)\n ��[4] Nitz et al. PRD 98, 024050 (2018)\n ��[5] Qi Chu, PhD Thesis, The University of Western Australia (2017)\n ��[6] Singer & Price PRD 93, 024013 (2016)",
  "circularId": 25012,
  "createdOn": 1562496103000,
  "email": "antier@apc.in2p3.fr",
  "subject": "LIGO/Virgo S190707q: Identification of a GW compact binary merger candidate",
  "submitter": "Sarah Antier at APC  <antier@apc.in2p3.fr>",
  "eventId": "LIGO/Virgo S190707q"
}