Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 23803

Trigger 886486: Swift detection of MAXI J1631-479
2019-01-29T10:05:05Z (5 years ago)
Kim Page at U.of Leicester <>
V. D'Elia (SSDC), A. Y. Lien (GSFC/UMBC), K. L. Page (U Leicester) report
on behalf of the Neil Gehrels Swift Observatory Team:

At 09:20:09 UT, the Swift Burst Alert Telescope (BAT) triggered and
located MAXI J1631-479 (trigger=886486).  Swift slewed immediately to the
source. The BAT on-board calculated location is
RA, Dec 247.718, -47.807 which is
   RA(J2000) = 16h 30m 52s
   Dec(J2000) = -47d 48' 23"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty).  As is usual with an image trigger, the available
BAT light curve shows no significant structure.

The XRT began observing the field at 09:22:18.0 UT, 128.4 seconds after
the BAT trigger. XRT found a bright, X-ray source located at RA, Dec
247.8086, -47.8071 which is equivalent to:
   RA(J2000)  = 16h 31m 14.06s
   Dec(J2000) = -47d 48' 25.6"
with an uncertainty of 5.2 arcseconds (radius, 90% containment),
consistent with the known the known position of MAXI J1631-479. No event
data are yet available to determine the column density using X-ray

You may have received an empty circular with this same title due to a
technical error. We apologise for the inconvenience.
Looking for U.S. government information and services? Visit