{
  "bibcode": "2006GCN..5541....1P",
  "body": "N.Prymak, G. Kanbach, H. Steinle, A. Stefanescu, S. Duscha, F. Schrey, \nM. Muehlegger (MPE Garching) of the\nOPTIMA-Burst Team report on optical observations of GRB060904b (BAT \ntrigger Nr. : 228006; Circ.Nr. 5505, Grupe et al.):\n\nOPTIMA-Burst at the 1.3m Skinakas Observatory, of the University of\nCrete, Greece, observed the Swift/UVOT 0.5\"-errorcircle of GRB060904b \n(GCN Circ. 5519, Oats et al.) on 2006 Sept. 04.\nRelative photometry to several close-by USNO catalog stars (referenced \nby their R magnitude) was performed for the\ndetected optical transient in our unfiltered images of 25 second \nexposure each. Results are listed:\n\n2006/Sept/04  post-BAT\n \nstart time(UT)  time(s)   R magnitude\n\n02:39:25             502   16.90+-0.12\n02:41:56             653   17.09+-0.16\n02:44:00             777   17.24+-0.19\n02:45:52             889   17.36+-0.17\n02:47:47            1004   17.44+-0.14\n02:48:56            1073   17.58+-0.14\n02:55:29            1466   17.70+-0.22\n02:56:01            1505   17.75+-0.20\n02:58:52            1669   17.94+-0.18\n03:00:14            1751   17.79+-0.21\n03:01:05            1802   17.89+-0.14\n\nSorry for the delay, we didn't have Internet connection from Sept 2.5 to \n6.7.",
  "circularId": 5541,
  "createdOn": 1157597920000,
  "email": "gok@mpe.mpg.de",
  "subject": "GRB060904b optical detections (delayed report due to internet outage)",
  "submitter": "Gottfried Kanbach at MPE  <gok@mpe.mpg.de>",
  "eventId": "GRB 060904B"
}