TITLE:   GCN CIRCULAR
NUMBER:  24987
SUBJECT: LIGO/Virgo S190701ah: Updated sky localization
DATE:    19/07/05 17:26:16 GMT
FROM:    Brandon Piotrzkowski at U of Wisconsin-Milwaukee  <piotrzk3@uwm.edu>

The LIGO Scientific Collaboration and the Virgo Collaboration report:

We have conducted further analysis of the LIGO and Virgo data around
the time of the compact binary coalescence (CBC) candidate S190701ah
(GCN 24950). Parameter estimation has been performed using
LALInference [1] and a new sky map, LALInference.offline.fits.gz,
distributed via GCN Notice, is available for retrieval from the
GraceDB event page:

https://gracedb.ligo.org/superevents/S190701ah

LALInference.offline.fits.gz is the preferred sky map at this time.
The 90% credible region is 49 deg2. Marginalized over the whole sky,
the a posteriori luminosity distance estimate is 1849 +/- 446 Mpc
(a posteriori mean +/- standard deviation).

Preliminary investigations indicate that the sky localization should
not be biased on account of the scattered light in Livingston
reported in GCN 24950; analyses including and excluding the affected
low-frequency data give consistent results.

For further information about analysis methodology and the contents
of this alert, refer to the LIGO/Virgo Public Alerts User Guide
<https/emfollow.docs.ligo.org/userguide/>.

[1] Veitch et al. PRD 91, 042003 (2015)