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GCN Circular 35965

Subject

GRB 240317B: Swift/BAT-GUANO Angular Error Correction

Date

2024-03-19T19:07:34Z (8 months ago)

From

Jimmy DeLaunay at Penn State <delauj2@gmail.com>

Via

Web form

James DeLaunay (PSU), Aaron Tohuvavohu (U Toronto), Samuele Ronchini (PSU), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC)  report:

During the detection of GRB 240317B, Swift was in safe point mode and had an unstable pointing. Due to this, the angular error is larger than previously reported (GCN 35948Not found
 
 
). We have performed an imaging analysis at the time of the GRB and found Cyg X-1 at an angular offset of ~1 deg. We also attempt to approximately correct the best fit position. 

The updated BAT position and error is,
RA, Dec = 271.95, +38.4 deg which is
   RA(J2000)  = 18h 07m 48.0s
   Dec(J2000) = +38d 24′ 00.0″
with an estimated uncertainty of ~1 deg radius