TITLE: GCN CIRCULAR NUMBER: 38479 SUBJECT: GRB 241209A: Prompt enhanced Swift-XRT position DATE: 24/12/09 06:41:12 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.

Using promptly downlinked XRT event data for GRB 241209A, we find a fading X-ray source with an enhanced position: RA,Dec = 155.39704, 6.32828 (degrees) which is equivalent to:

RA (J2000.0) = 10 21 35.29 DEC (J2000.0) = +06 19 41.8

with an uncertainty of 1.9 arcsec (radius, 90% containment). This location is 87.3 arcseconds from the BAT onboard position, inside the BAT error circle. Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/1273071 .

Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).

This circular is an official product of the Swift-XRT team.

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