A Chandra HRC-I observation of IGR J00335+6126

ATel #1326; P. G. Jonker (SRON/CfA), L. Kuiper (SRON)
on 12 Dec 2007; 12:27 UT
Credential Certification: P.G. Jonker (pjonker@cfa.harvard.edu)

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We report on our analysis of a 1.1 ksec Chandra HRC-I observation of the field of IGR J00335+6126 (Kuiper et al. ATel #939 = IGR J00333+6122) obtained on Dec. 13, 2006 with the goal to determine an accurate position of the counterpart of IGR J00335+6126. Two sources are detected in the INTEGRAL error circle that coincide with the two sources detected with the Swift-XRT reported in ATel #1322 (Landi et al.). We determine the following two positions for the sources: RA1: 00 33 18.41 DEC1: 61 27 43.1 RA2: 00 33 57.71 DEC2: 61 26 33.4 Adding in quadrature the uncertainties in source localisation and in the Chandra aspect yield an overall uncertainty in the source position of 0.6 arcsec for both sources (90 per cent confidence). Landi et al. (ATel #1322) reported that the X-ray spectrum of source number 2 is soft, which is consistent with the larger number of counts in the HRC image for this source than for source 1 (190 vs. 53 counts for source 2 and 1, respectively). The soft spectrum and the absence of strong accretion disc emission lines (Masetti et al. 2006, ATel #941) implies that this source is a symbiotic X-ray binary. We further note that our improved position suggests that the NIR counterpart to source 1 is the point source 2MASSJ00331833+6127432 which has J,H, and K magnitudes of J=15.665+-0.080, H=14.379+-0.052, K=13.081+-0.037, respectively.