{
  "bibcode": "2005GCN..3233....1T",
  "body": "K. Torii (Osaka U.) reports\n\n \"The error region of GRB 050401 (Angelini, et al. GCN 3161; Barbier,\net al. GCN 3162) was observed with the ART 14-inch telescope. BVRcIc\nimaging started at 2005 April 1, 14:22:23 UT (128-s after trigger) and\n60-s exposure in each filter was repeated.\n\n The optical afterglow (McNaught & Price GCN 3163) is not detected in\nour frames and the following 3-sigma upper limits are derived relative\nto USNO-B1.0 magnitudes.\n\nMeanEpoch(UT) Magnitude Exposure\n14:22:53 >12.8Rc 60s\n14:24:02 >13.2Ic 60s\n14:27:27 >13.4Rc 60s\n14:28:34 >13.4Ic 60s\n14:32:00 >13.7Rc 60s\n14:33:07 >14.0Ic 60s\n\"",
  "circularId": 3233,
  "createdOn": 1113220668000,
  "email": "torii@crab.riken.go.jp",
  "subject": "GRB 050401: Optical limit",
  "submitter": "Ken ichi Torii at RIKEN  <torii@crab.riken.go.jp>",
  "eventId": "GRB 050401"
}