{
  "bibcode": "2013GCN.15541....1K",
  "body": "K. S. Kawabata, R. Itoh, N. Ebisuda, I. Ueno (Hiroshima Univ.) \nreport on behalf of Kanata team:\n\nWe performed a series of optical imaging (polarimetric mode) for \nthe optical afterglow of GRB 131128A (Sonbas et al., GCN 15533; \nXu et al., GCN 15535; Gorbovskoy et al, GCN 15536; Goad et al., \nGCN 15538; Sonbas et al., GCN 15540) using HOWPol attached to \nthe 1.5-m Kanata telescope at Higashi-Hiroshima Observatory, Japan. \n\nOur first 30 sec exposure began at t=360 sec since Swift/BAT trigger\nand we detected the afterglow located at 9\" west and 4\" north of the \nbright star, USNO-B 2766-00858-1 (R2 = 11.63 mag). The magnitude of \nthe afterglow is preliminarily estimated to be about R=17.5, although \nit might be still contaminated by the neaby bright star. The afterglow\nquickly decayed and became fainter than ~18 mag at t=620 sec.",
  "circularId": 15541,
  "createdOn": 1385694090000,
  "email": "kawabtkj@hiroshima-u.ac.jp",
  "subject": "GRB 131128A: Kanata/HOWPol optical observation",
  "submitter": "Koji Kawabata at HASC,Hiroshima U  <kawabtkj@hiroshima-u.ac.jp>",
  "eventId": "GRB 131128A"
}