TITLE: GCN CIRCULAR NUMBER: 36109 SUBJECT: GRB 240415A: Prompt Swift-XRT observations DATE: 24/04/15 08:00:44 GMT FROM: P.A. Evans at U. Leicester <pae9@leicester.ac.uk> P.A. Evans (U. Leicester), K.L. Page (U. Leicester) and M. J. Moss (GSFC) report on behalf of the Swift-XRT team: The automated Swift slew to GRB 240415A (BAT trigger 1221874; Moss et al., GCN Circ. 36108) was delayed due to an Earth limb constraint. The XRT began observing the field at 07:21:58.2 UT, 3305 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 129.19096 73.14608 which is equivalent to: RA(J2000) = 08h 36m 45.83s Dec(J2000) = +73d 08' 45.9" with an uncertainty of 3.6 arcseconds (radius, 90% containment). This is 105 arcseconds from the BAT position, inside the BAT error circle. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (2.49 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 6.5 (+3.49/-2.94) x 10^21 cm^-2 (90% confidence). View this GCN Circular online at https://gcn.nasa.gov/circulars/36109. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...