{
  "bibcode": "2015GCN.18677....1K",
  "body": "Yuki Kikuchi (U. of Tokyo), Masaomi Tanaka (NAOJ), Ryou Ohsawa,\nMakoto Ichiki, Shigeyuki Sako, Tomoki Morokuma, Mamoru Doi (U. of Tokyo),\nNozomu Tominaga (Konan U.), Motoko Serino (RIKEN), Akihiro Suzuki,\nKeiichi Maeda (Kyoto U.), and Takanori Sakamoto (AGU) report:\n\nWe performed optical non-filter imaging observations for\nthe MAXI-detected burst GRB 151205C (Nakajima et al. GCN Circ. 18666)\nwith a prototype model camera of Tomo-e Gozen (Tomo-e PM).\nTomo-e Gozen is a wide-field optical imaging camera\nwith 84 1kx2k CMOS sensors on the focal plane of\nthe 1.05-m Kiso Schmidt telescope (Sako et al. in preparation,\nhttp://www.ioa.s.u-tokyo.ac.jp/tomoe/).\nThe prototype model camera has 8 CMOS sensors along the RA direction\nwith spatial gaps of 25 arcmin between the adjacent chips.\nThe field-of-view of each chip is 39.7 arcmin (RA) x 22.4 arcmin (Dec).\nThanks to the low dark current of the sensors in room\ntemperature, we operate the CMOS sensors without coolers\nwhich enables us to make a light-weight camera system.\nBy using 1 of 8 chips of Tomo-e PM,\nmultiple regions which cover in total 95% of the localization area \n(with the following central coordinates) have been observed.\n\n RA       | Dec       | Obs. time        | t-t0*  | Exptime |\n (J2000)  | (J2000)   | (UT)             | (days) | (sec)   |\n 22:00:34 | +77:39:51 | 2015 Dec 6 14:08 | 0.59   | 150     |\n 21:58:01 | +77:41:46 | 2015 Dec 6 14:25 | 0.60   | 150     |\n 22:05:23 | +78:26:45 | 2015 Dec 7 09:12 | 1.39   | 180     |\n 22:02:51 | +78:06:14 | 2015 Dec 7 09:15 | 1.39   | 180     |\n 21:55:36 | +77:28:11 | 2015 Dec 7 09:22 | 1.39   | 180     |\n 21:58:37 | +77:45:37 | 2015 Dec 7 09:26 | 1.40   | 180     |\n 22:08:11 | +78:19:44 | 2015 Dec 8 14:22 | 2.60   | 150     |\n 22:04:56 | +78:03:18 | 2015 Dec 8 14:25 | 2.61   | 144     |\n 22:02:25 | +77:42:13 | 2015 Dec 8 14:29 | 2.61   | 144     |\n 21:58:14 | +77:22:13 | 2015 Dec 8 14:31 | 2.61   | 180     |\n 21:55:13 | +77:04:13 | 2015 Dec 8 14:34 | 2.61   | 180     |\n* time after the burst\n\nWe performed image subtraction using\nPTF R-band data taken on 2011 Jul 17 as references\n(obtained through IPAC, Law et al. 2009, PASP, 121, 1395;\nLaher et al. 2014, PASP, 126, 674).\nNo new transient objects have been found within these fields.\nThe limiting magnitudes of our data are about 20 mag\n(calibrated with USNO UCAC3 catalog, Zacharias et al. 2010, AJ, 139, 2184).",
  "circularId": 18677,
  "createdOn": 1449716406000,
  "email": "masaomi.tanaka@nao.ac.jp",
  "subject": "GRB 151205C: Optical follow-up observations at Kiso",
  "submitter": "Masaomi Tanaka at NAOJ  <masaomi.tanaka@nao.ac.jp>",
  "eventId": "GRB 151205C"
}