GCN Circular 7172
E. O. Ofek, S. R. Kulkarni, M. M. Kasliwal, A. Rau, S. B. Cenko (Caltech), D. B. Fox (Penn State) on behalf of a larger collaboration. We inspected the Swift X-ray observations of the X-ray transient associated with NGC 2770 (Berger & Soderberg 2008; ATel 1353; GCN 7159). We looked for periodicity in the X-ray data that may hint on association with a fast rotating object. We do not identify any (non-instrumental) periodicity in the data, below the sampling frequency of 0.4 Hz. We estimate that the fraction of photons that are modulated periodically (if at all) is smaller than 10%. The X-ray event started approximately at the beginning of the XRT observation at UTC 2008 Jan 09.5652. Peak flux (in 10 s intervals) was achieved about 65 s later. We note that the analysis is based on 697 photons, within 20 pixels from the transient location and detected within 1000 s of the beginning of the XRT observation.