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Improved X-ray position for SAXJ1753.5-2349

ATEL # 1814; R. Starling and P. Evans (University of Leicester)
on 26 Oct 2008; 16:55 UT
Password Certification: Rhaana Starling (

Subjects: Optical, X-ray, Transients

We report an improved position for the X-ray burster SAXJJ1753.5-2349 (e.g. Markwardt, Krimm & Swank, ATEL #1799) using Swift data from the recent target-of-opportunity observations on 2008 October 23.

Using 182 s of XRT Photon Counting mode data and 1 UVOT image, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue) of RA, Dec = 268.38290, -23.82130 deg which is equivalent to:
RA (J2000): 17 53 31.90
Dec (J2000): -23 49 16.7
with an uncertainty of 2.3 arcsec (radius, 90% confidence). Position enhancement is described by Goad et al. (2007, A&A, 476, 1401); the current algorithm is an extension of this method. This is 4.5 arcsec from, and consistent with, the previously reported X-ray position (Degenaar & Wijnands, ATEL #1809).

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