TITLE: GCN CIRCULAR NUMBER: 39940 SUBJECT: GRB 250330A: Prompt Swift-XRT position DATE: 25/03/30 09:00:27 GMT FROM: K.L. Page at U Leicester klp5@leicester.ac.uk
K.L. Page and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
Because of the location of Swift with respect to the South Atlantic Anomaly at the time of the burst, XRT began collecting Photon Counting mode data for GRB 250330A (GCN Circ. 39938) around 4 ks after the trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec = 252.9515, -86.87972 which is equivalent to
RA (J2000): 16h 51m 48.36s Dec (J2000): -86d 52' 47.0"
with an uncertainty of 3.9 arcsec (radius, 90% confidence). This is 47 arcseconds from the BAT position, inside the BAT error circle.
This circular is an official product of the Swift-XRT team.
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