TITLE: GCN CIRCULAR NUMBER: 21239 SUBJECT: LIGO/Virgo G288732: Updated sky map from gravitational-wave data DATE: 17/06/10 00:50:16 GMT FROM: Eve Chase at Northwestern U./LIGO The LIGO Scientific Collaboration and Virgo Collaboration report: We have re-analyzed LIGO data around the time of the compact binary coalescence (CBC) event candidate G288732 (GCN 21221) taking into account our current understanding of calibration uncertainties. Parameter estimation has been performed using LALInference (Veitch et al., PRD 91, 042003) and a new sky map, LALInference.fits.gz, is available for retrieval from the GraceDB event page: https://gracedb.ligo.org/events/G288732 This is the preferred sky map at this time. This map spans one arc in the Northern hemisphere in nearly the same position as the original BAYESTAR sky map but the region with the highest probability has shifted further north. The 50% and 90% credible regions span about 340 and 1090 square degrees, respectively, which are somewhat larger than the initial BAYESTAR sky map due to marginalizing over calibration uncertainties. We will recalculate the sky map once the full recalibration is complete and will share it at that time, but that is likely at least a few weeks away.