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Haswell, C. A.; Chaty, S.; Norton, A. J.; Chen, W. and Hynes, R. I. (1999). Multiwavelength observations of XTE J1859+226. Astronomer's Telegram.
URL: http://www.astronomerstelegram.org/?read=49
Abstract
We have scheduled further simultaneous HST and RXTE observations of the new X-ray transient XTE J1859+226, planned from October 27th 1999 19:26 to October 28th 00:02 UT. Coordinated multi-wavelength observations (simultaneous, near-simultaneous, and following the evolution over days/weeks) would be extremely helpful. If you can observe simultaneously with HST and/or XTE, high time-resolution data (< 10 seconds) will be particularly useful.