KRAUSS M.I., DULLIGHAN A., CHAKRABARTY D., VAN KERKWIJK M.H. and MARKWARDT C.B.
Abstract (from CDS):
M. I. Krauss, A. Dullighan, and D. Chakrabarty, Massachusetts Institute of Technology; M. H. van Kerkwijk, University of Toronto; and C. B. Markwardt, University of Maryland and Goddard Space Flight Center, report on a 9700-s observation of XTE J1814-338 (IAUC 8144) on June 20.1 UT with the Chandra X-Ray Observatory (+ ACIS-S/HETGS). The x-ray source remains active, with a 0.5-10-keV flux of approximately 15 mCrab. Its position is R.A. = 18h13m39s.03, Decl. = -33o46'22".3 (equinox 2000.0), with a 90- percent-confidence radius of 0".6. The likely optical counterpart was also observed at this position in images acquired on June 6.4 with the Magellan/Clay 6.5-m telescope in Chile, with magnitudes of B = 17.3 and R = 18.8 (uncertainties 0.1 mag). The star brightened by about 0.2 mag in both bands on June 7.4, and it was undetected in a 1989 Digitized Sky Survey image (limiting mag R > 20). Note that there is a nearby field star of similar brightness (R = 19, B = 20) located just 1".7 southeast of the proposed counterpart. Further multiwavelength observations of the pulsar as it fades are strongly encouraged.