GCN Circular 21493

Subject

LIGO/Virgo G297595: Updated localization from LIGO and Virgo data

Event

Date

2017-08-16T07:02:19Z (9 years ago)

From

Leo Singer at NASA/GSFC <leo.p.singer@nasa.gov>

The LIGO Scientific Collaboration and Virgo Collaboration report:

We have re-analyzed LIGO and Virgo data around the time of the compact binary
coalescence (CBC) event candidate G297595 (GCN 21474Loading...
 
 ) 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/G297595

This is the preferred sky map at this time. The probability is
concentrated near R.A.=03h06m, Dec.=-44d36m. The 50% and 90% credible
regions span about 36 and 190 square degrees, respectively, somewhat
larger than the initial BAYESTAR sky map due to marginalizing over
calibration uncertainties. The 90% credible regions of the initial and
this updated localization have significant overlap, but the 50% credible
region is shifted east by its entire width.

[GCN OPS NOTE(17aug17): Per author's request, "We have re-analyzed LIGO data..."
was changed to "We have re-analyzed LIGO and Virgo data..."]