GCN Circular 23800
Subject
Swift Trigger 886157: Swift detection of a new transient Swift J1728.9-3613
Date
2019-01-28T01:47:01Z (6 years ago)
From
Jamie A. Kennea at PSU/Swift-XRT <kennea@swift.psu.edu>
S. D. Barthelmy (GSFC), A. D'Ai (INAF-IASFPA), V. D'Elia (SSDC),
J. A. Kennea (PSU), 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 01:22:25 UT, the Swift Burst Alert Telescope (BAT) triggered and
located a new transient which we name Swift J1728.9-3613 (trigger=886157).
The BAT on-board calculated location is
RA, Dec 262.232, -36.237 which is
RA(J2000) = 17h 28m 56s
Dec(J2000) = -36d 14' 13"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). As is normal for an image trigger, the onboard
light-curve showed no significant structure.
Due to a Sun observing constraint, Swift cannot slew to the BAT
position until 09:11 UT on 2019 January 29. There will thus be no XRT
or UVOT data for this trigger before this time.
The rise of this transient was seen by the BAT transient monitor
(Krimm et al., 2013), with the first detection on 2019 January 25. The BAT
light-curve can found at the following link:
https://swift.gsfc.nasa.gov/results/transients/weak/SWIFTJ1728.9-3613/SWIFTJ1728.9-3613.html