{
  "bibcode": "2007GCN..6136....1G",
  "body": "A. C. Gupta\nNational Astronomical Observatories/Yunnan Observatory \nCAS, P.O. Box 110, Kunming, Yunnan 650011, China\n\nWe observed the field of GRB 070223 (GCN 6125) with CCD detector\nat our 1.02 meter telescope of the Yunnan observatory, Kunming, \nChina. We started our observation on Feb. 23, 2006 at UT 13:21:20.\nWe took 5 image frames of 200 seconds exposure time of each in\nthe optical R passband. There is no detection of optical afterglow\ncandidate in our combined 5 images. The 5-sigma limiting magnitude\nof our observations is R ~ 20.0 mag.",
  "circularId": 6136,
  "createdOn": 1172274805000,
  "email": "alok@ynao.ac.cn",
  "eventId": "GRB 070223",
  "subject": "GRB 070223: Optical observations",
  "submitter": "Alok Chandra Gupta at Nat. Astro. Obs./Yunnan Obs  <alok@ynao.ac.cn>"
}