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GCN Circular 35863

Subject

Swift Trigger 1218645: Another detection of Swift J151857.0-572147

Date

2024-03-04T18:39:12Z (2 months ago)

From

Jamie Kennea at Penn State <jak51@psu.edu>

Via


E. Ambrosi (INAF-IASFPA), J. A. Kennea (PSU), A. Y. Lien (U Tampa),
M. J. Moss (GSFC), K. L. Page (U Leicester), M. H. Siegel (PSU) and
M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift
Observatory Team:

At 18:26:54 UT, the Swift Burst Alert Telescope (BAT) triggered and
located Swift J151857.0-572147 (trigger=1218645).  Swift slewed 
immediately to the source. 
The BAT on-board calculated location is 
RA, Dec 229.720, -57.363 which is 
   RA(J2000) = 15h 18m 53s
   Dec(J2000) = -57d 21' 47"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty). 

This is the third BAT trigger on Swift J151857.0-572147 (GCN #35849, 
GCN #35853, GCN #35858). Repeated triggers indicate that the source
is continuing to brighten.