TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2547 SUBJECT: GRB040223, improved XMM position DATE: 04/03/17 15:08:40 GMT FROM: Andrea De Luca at IASF-CNR,Milano A. De Luca (IASF, Milan, on behalf of Progetto Swift Italia), S. Mereghetti, A. Tiengo (IASF, Milan), S. Campana (OAB-Merate) report: We have obtained an improved position for the likely afterglow of the INTEGRAL GRB 040223 (GCN 2525) Astrometry of the XMM-Newton/EPIC images was done by matching X-ray sources in the field to stars in the USNO-B1 catalogue. The refined position (J2000) for the X-ray afterglow (source XMMU J163929.9-415601, GCN 2530) is: RA:16h 39m 30.17s Dec:-41d 55' 59.7'' The 1 sigma error radius is 1.5 arcsec (including the rms error on the cross-correlation as well as systematic uncertainties in the optical catalogue). This message may be cited.