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Time-Resolved CCD Photometry of the Optical Counterpart of Swift J2319.4+2619

ATEL # 1318; A. Shafter, E. Marin, and N. Sreenivasamurthy (SDSU)
on 4 Dec 2007; 4:45 UT
Password Certification: Allen W. Shafter (

Subjects: Optical, Cataclysmic Variables

We report the results of time-resolved CCD photometry of the Swift polar candidate recently identified by Mukai et al. (ATel#1309). A five-hour time series of V-band photometry at ~1 min time resolution was obtained with the Mount Laguna Observatory 1-m reflector during the interval 2007 Dec. 03.08 - 03.29 UT. These data reveal a strong, nearly sinusoidal modulation in the light curve with a period of ~0.12 day, and a peak-to-peak amplitude of ~1 mag (ranging from V~17.5 to V~16.5). It is likely that the observed modulation reflects the orbital period of the system, but time-resolved spectroscopic and/or polarimetric observations will be required to confirm this possibility.

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