{
  "bibcode": "2004GCN..2819....1T",
  "body": "K. Torii and Yuuichi Fukazawa (Osaka University) report:\n\n We have further analyzed the data reported in GCN #2813 and derived\nthe following limits on the optical afterglow of GRB 041016 (HETE\nTrigger #3578). We made two pointings\nand obtained 12 x 300-s frames for each pointing. The 12 frames from\neach pointing was stacked to yield a single frame and compared with\nthe USNO-A2.0 (R) catalog. We found no new source brighter than the\nlimiting magnitude of each frame as given below.\n\n The first pointing (07:14 UT - 08:26 UT) \nwas 24x24 arcmin field centered at \n(RA, Dec.) = (01 44 53, -04 17 12) (J2000). The limiting magnitude\nof the stacked frame was 18.4.\n\n The second pointing (08:36 UT - 09:48 UT)\nwas 24x24 arcmin field centered at \n(RA, Dec.) = (01 44 48, -04 24 21) (J2000). \nThe limiting magnitude of the stacked frame was 18.7.\n\n Starting at 11:54 UT on 2004 October 16, a part of the GRB 041016\nerror region was also observed at Osaka University with the 14-inch\ntelescope and unfiltered CCD. We stacked the first 60 frames of 60-s\nexposure and compared it with the USNO-A2.0 (R) catalog. No new source\nbrighter than 18.2 mag was found in the 25x25 arcmin field centered at\n(RA, Dec.) = (01 44 39, -04 12 13) (J2000).\n\n===",
  "circularId": 2819,
  "createdOn": 1098000898000,
  "email": "torii@crab.riken.go.jp",
  "subject": "GRB 041016: Optical limits",
  "submitter": "Ken ichi Torii at RIKEN  <torii@crab.riken.go.jp>",
  "eventId": "GRB 041016"
}