{
  "bibcode": "2006GCN..5160....1K",
  "body": "M. Kuwahara (TUS/RIKEN), M. Tashiro, Y. Urata, K. Abe, K. Onda,\nN. Kodaka, K. Masuno (Saitama-U), F. Usui (ISAS/JAXA), T. Tamagawa\n(RIKEN) on behalf of the WIDGET collaboration report: \n\n\"We have observed the entire error region of the Swift GRB 060413\n(Pagani et al., GCN 4957, 4959) with the very wide-field camera,\nWIDGET, located at Akeno, Japan.  WIDGET has continuously monitored\nthe Swift Field-of-View with repeat of unfiltered 5-second exposures\nbetween 26 seconds before and 335 seconds after the burst. The 1-sigma\nlimiting magnitude of each frame derived by the Tycho-2 catalog was\naround V=10 mag. There was no significant emission from the X-ray\nafterglow position up to the limiting magnitudes.\" \n\nThis message may be cited.",
  "circularId": 5160,
  "createdOn": 1148459192000,
  "email": "tamagawa@riken.jp",
  "subject": "GRB 060413 : WIDGET simultaneous optical observations",
  "submitter": "Toru Tamagawa at RIKEN  <tamagawa@riken.jp>",
  "eventId": "GRB 060413"
}