A 3.2 hr candidate orbital period for SWIFT J1753.5-0127

Zurita, C.; Torres, M. A. P.; Durant, M.; Shahbaz, T.; Peralta, H. H.; Casares, J.; Steeghs, D.
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The Astronomer's Telegram, #1130

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We report time-resolved photometry of the optical counterpart to the black hole candidate SWIFT J1753.5-0127 (Palmer et al. 2005, ATel #546: Halpern et al. 2005, ATel #549). After its discovery, this source has remained in the low/hard state and bright at optical/IR wavelengths. Our analysis indicates that this X-ray transient is a short orbital period X-ray binary. We obtained time-series photometry on 2007 Jun 3, 4, 5, 7 and 8 UT with the 1.5-m telescope and from 2007 Jun 27 to Jul 1 UT with the 0.84-m telescope, both at the Mexican Observatorio de San Pedro Martir.