{
"subject": "LIGO/Virgo S200115j: Identification of a GW compact binary merger candidate",
"bibcode": "2020GCN.26759....1L",
"createdOn": 1579068511000,
"circularId": 26759,
"submitter": "Deep Chatterjee at University of Wisconsin, Milwaukee ",
"email": "deep@uwm.edu",
"body": "The LIGO Scientific Collaboration and the Virgo Collaboration report:\n\nWe identified the compact binary merger candidate S200115j during\nreal-time processing of data from LIGO Hanford Observatory (H1), LIGO\nLivingston Observatory (L1), and Virgo Observatory (V1) at 2020-01-15\n04:23:09.742 UTC (GPS time: 1263097407.742). The candidate was found\nby the GstLAL [1], PyCBC Live [2], MBTAOnline [3], and SPIIR [4]\nanalysis pipelines.\n\nS200115j is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 2.1e-11 Hz, or about one in 1e3\nyears. The event's properties can be found at this URL:\nhttps://gracedb.ligo.org/superevents/S200115j\n\nThe classification of the GW signal, in order of descending\nprobability, is MassGap (>99%), Terrestrial (<1%), BNS (<1%), NSBH\n(<1%), or BBH (<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>99%. Using the masses and spins inferred from the signal, the\nprobability of matter outside the final compact object (HasRemnant) is\n9%.\n\nThree sky maps are available at this time and can be retrieved from\nthe GraceDB event page:\n * bayestar.fits.gz,0, an initial localization generated by BAYESTAR\n[5], distributed via GCN notice about 6 minutes after the candidate\nevent time.\n * bayestar.fits.gz,1, an initial localization generated by BAYESTAR\n[5], distributed via GCN notice about 12 minutes after the candidate\nevent time.\n * bayestar.fits.gz,2, an initial localization generated by BAYESTAR\n[5], distributed via GCN notice about an hour after the candidate\nevent time.\n\nThe preferred sky map at this time is bayestar.fits.gz,2. For the\nbayestar.fits.gz,2 sky map, the 90% credible region is 908 deg2.\nMarginalized over the whole sky, the a posteriori luminosity distance\nestimate is 331 +/- 97 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo Public Alerts User Guide\n.\n\n [1] Messick et al. PRD 95, 042001 (2017)\n [2] Nitz et al. PRD 98, 024050 (2018)\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)"
}