{
  "bibcode": "2007GCN..6492....1S",
  "body": "A. Stefanescu (1), A. Slowikowska (2)(3), G. Kanbach (1), S. Duscha (1), \nF. Schrey (1), H. Steinle (1), Z. Ioannou (4) of the OPTIMA-Burst Team \nreport the following:\n(1)=MPE, Garching, (2)=FORTH, Heraklion (3)=NCAC, Torun (4)=Univ. of Crete\n\n\"OPTIMA-Burst at the 1.3m Skinakas Observatory, of the University of\nCrete, Greece slewed to the Swift BAT-errorcircle of GRB 070610 (GCN\nCirc 6489, C. Pagani et al.) and started observations at 20:53:23UT (57s \nafter the burst, 28s after the notice).\n\nWe detected a faint transient in the BAT errorcircle. The transient was \nmarginally detected as 19+-0.4 mag in our first 10s white-light image, \nand was not detected in subsequent CCD frames. The position of the \ntransient is inside the XRT error-circle (GCN 6490, C. Pagani et al.).\n\nAt 20:57:19 (293s after the burst) observations with the fibre-fed, \nsingle-photon-counting high-time-resolution main instrument of \nOPTIMA-Burst started. A quick-look analysis of this data binned to 1s \nresolution indicates that the source is barely detectable (below the 2 \nsigma level) until 21:00:22 (476s after the burst). At that time the \nsource showed a flaring activity of about 7.5 sigma above the background \nlevel. The activity lasted about 80s and consisted of three to four \noverlapping spikes and a slow decay.\n\nFurther analysis is in progress.\"\n\nThis message may be cited.",
  "circularId": 6492,
  "createdOn": 1181521375000,
  "email": "astefan@mpe.mpg.de",
  "subject": "GRB 070610: OPTIMA-Burst high-time-resolution optical observations",
  "submitter": "Alexander Stefanescu at MPE  <astefan@mpe.mpg.de>",
  "eventId": "GRB 070610"
}