{
  "bibcode": "2008GCN..7172....1O",
  "body": "E. O. Ofek, S. R. Kulkarni, M. M. Kasliwal, A. Rau, S. B. Cenko (Caltech),\nD. B. Fox (Penn State) on behalf of a larger collaboration.\n\nWe inspected the Swift X-ray observations of the X-ray transient\nassociated with NGC 2770 (Berger & Soderberg 2008; ATel 1353; GCN 7159).\nWe looked for periodicity in the X-ray data that may hint\non association with a fast rotating object.\nWe do not identify any (non-instrumental) periodicity in the\ndata, below the sampling frequency of 0.4 Hz.\nWe estimate that the fraction of photons that are modulated\nperiodically (if at all) is smaller than 10%.\n\nThe X-ray event started approximately at the beginning\nof the XRT observation at UTC 2008 Jan 09.5652. Peak flux (in 10 s\nintervals) was achieved about 65 s later.\n\nWe note that the analysis is based on 697 photons, within 20 pixels from the\ntransient location and detected within 1000 s of the\nbeginning of the XRT observation.",
  "circularId": 7172,
  "createdOn": 1200090103000,
  "email": "eran@wise1.tau.ac.il",
  "subject": "XRF in NGC 2770: Search for X-ray periodicity",
  "submitter": "Eran Ofek at Tel Aviv U.  <eran@wise1.tau.ac.il>"
}