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 23776

Trigger 885456: Swift detection of MAXI J1631-479
2019-01-24T03:34:41Z (5 years ago)
Aaron Tohuvavohu at PSU/Swift <>
V. D'Elia (SSDC), A. Y. Lien (GSFC/UMBC), K. L. Page (U Leicester),
D. M. Palmer (LANL) and A. Tohuvavohu (PSU) report on behalf of the
Neil Gehrels Swift Observatory Team:

At 03:17:21 UT, the Swift Burst Alert Telescope (BAT) triggered and
located MAXI J1631-479 (trigger=885456).  Swift slewed immediately to the target. 
The BAT on-board calculated location is 
RA, Dec 247.798, -47.808 which is 
   RA(J2000) = 16h 31m 11s
   Dec(J2000) = -47d 48' 28"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  As is typical for an image trigger, there is nothing
visible in the real-time light curve. 

The XRT began observing the field at 03:19:14.0 UT, 112.3 seconds after
the BAT trigger. XRT found a bright, uncatalogued X-ray source located
at RA, Dec 247.8092, -47.8066 which is equivalent to:
   RA(J2000)  = 16h 31m 14.21s
   Dec(J2000) = -47d 48' 23.8"
with an uncertainty of 5.3 arcseconds (radius, 90% containment), 
consistent with the known position of MAXI J1631-479. No event data 
are yet available to determine the column density using X-ray spectroscopy. 

The initial flux in the 0.1 s image was 3.90e-08 erg cm^-2 s^-1 (0.2-10
Looking for U.S. government information and services? Visit