Identification of the optical counterpart of 1RXS J190141.0+012618 and a search for the optical counterpart of XTE J1901+014

Powell, C.R.; Norton, A.J.; Haswell, C.A.; Wolters, S.D.; Green, S.F.; Morales-Rueda, L.; Charles, P.A. and Worters, H. (2002). Identification of the optical counterpart of 1RXS J190141.0+012618 and a search for the optical counterpart of XTE J1901+014. Astronomer's Telegram.

URL: http://www.astronomerstelegram.org/?read=93

Abstract

The RXTE error circle of X-ray transient XTE J1901+014, reported in IAUC # 7880 , includes the much smaller error circle of ROSAT source 1RXS J190141.0+012618, HRI position 19h01m40.1s, +1 26' 30" (J2000) uncertainty 10" (ATEL #89). We obtained Jacobus Kaptyn Telescope B, V, R, I images of the field on 2002 April 18 04:15 - 04:30, the same filters at the IAC80 Telescope (Instituto de Astrofísica de Canarias, Tenerife) on the same night 04:30 - 04:50, and R on the JKT on 2002 April 28 04:45. We find a source at 19h01m39.90s, +01 26' 39.2", coincident with the HRI position, with V=18.72, B-V=2.44, V-R=-0.93, R-I=1.64. The V magnitude is calibrated against the Guide Star Catalog owing to lack of standard observations. Plots of B-V vs. R and B-R vs. I show this to be the only significantly blue object in the field. No variability was detected, so we cannot confirm identification with the RXTE object, nor find an alternative candidate, and no objects were visibly different from the Digitised Sky Survey. Photometry of JKT20020418 for 354 objects is tabulated at http://physics.open.ac.uk/~crpowell/J1901_014/JKT20020418BVRI.html. The candidate is star #346, ordered by I magnitude, and is indicated by the purple cross on the image at http://physics.open.ac.uk/~crpowell/J1901_014/JKT20020418.html.

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