{
  "bibcode": "2019GCN.24047....1A",
  "body": "R. Adachi, M. Niwano, K. Iida, K. L. Murata, M. Oeda,\nK. Shiraishi, Y. Yatsu, and N. Kawai (Tokyo Tech)\nreport on behalf of the MITSuME collaboration:\n\nWe performed tiling observation for the error region of GRB 190330A\n(B. Biltzinger et al., GCN Circular #24026)\nwith an optical tri-color (g', Rc, and Ic) camera attached to\nthe MITSuME 50cm telescopes at Akeno Observatory\nand Okayama Astrophysical Observatory, in Japan.\n\nThe follow up observation started at 2019-03-31 10:14:29 UT, 63,297\nsec after the trigger.\nOur tiling observation covered almost 100% of the Fermi-GBM Ground\nPosition error circle\n(GCN Notices Trigger num.=575656777, record num.=58).\nCompared our co-added images with GSC2.3 catalog,\nwe found no bright optical transient in the observed region.\nBecause the elevation of the target field had dropped from 50 deg to 10 deg\nduring the observations and the sky condition was unstable,\nthe obtained upper limits are different for each field.\nThe 5-sigma upper limits of the co-added images are listed below.\n\nField num.   center position(R.A., Dec.)   size of field(R.A.(arcmin)\nx Dec.(arcmin))   5-sigma upper limit   start observation time(UT)\n-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------\nField 0    6:03:09, +16:37:06   25.5 x 25.7   g' > 18.4, Rc > 18.2, Ic\n> 17.4   10:14:29  31 March\nField 1    6:04:43, +16:36:23   25.4 x 25.7   g' > 18.6, Rc > 18.2, Ic\n> 17.4   11:16:01  31 March\nField 2    6:03:13, +17:01:38   23.4 x 23.6   g' > 17.2, Rc > 16.7, Ic\n> 16.4   10:58:11  31 March\nField 3    6:04:46, +17:00:37   25.5 x 25.8   g' > 18.8, Rc > 18.4, Ic\n> 17.4   10:55:30  31 March\nField 4    6:03:12, +16:13:33   23.6 x 23.8   g' > 17.2, Rc > 16.8, Ic\n> 16.2   10:37:03  31 March\nField 5    6:01:26, +16:36:42   25.7 x 25.8   g' > 18.1, Rc > 16.7, Ic\n> 16.3   10:35:00  31 March\nField 6    6:04:51, +16:13:42   23.6 x 23.8   g' > 16.9, Rc > 16.5, Ic\n> 16.7   12:01:41  31 March\nField 7    6:01:23, +17:01:33   24.1 x 24.6   g' > 17.6, Rc > 17.2, Ic\n> 16.3   11:57:02  31 March\nField 8    6:06:33, +16:37:22   23.3 x 23.7   g' > 17.0, Rc > 16.4, Ic\n> 16.1   11:40:32  31 March\nField 9    6:03:01, +17:24:00   25.3 x 25.8   g' > 18.4, Rc > 17.9, Ic\n> 17.0   11:36:32  31 March\nField 10  6:01:30, +16:13:18   22.6 x 23.8   g' > 17.1, Rc > 16.7, Ic\n> 16.8   11:19:19  31 March\nField 11  6:06:19, +17:01:13   21.8 x 23.6   g' > 18.1, Rc > 17.8, Ic\n> 16.8   12:58:58  31 March\nField 12  6:04:53, +17:25:24   23.6 x 23.6   g' > 16.9, Rc > 16.1, Ic\n> 16.6   12:44:02  31 March\nField 13  6:06:19, +16:13:18   22.9 x 23.9   g' > 18.1, Rc > 17.5, Ic\n> 16.8   12:38:20  31 March\nField 14  6:01:30, +17:25:24   22.9 x 23.7   g' > 17.0, Rc > 16.3, Ic\n> 16.8   12:22:51  31 March\nField 15  6:02:59, +15:49:25   23.8 x 24.4   g' > 17.5, Rc > 17.0, Ic\n> 16.5   12:17:41  31 March\nField 16  5:59:51, +16:37:12   23.2 x 24.1   g' > 15.5, Rc > 15.5, Ic\n> 15.6   13:47:37  31 March\nField 17  6:04:32, +15:48:43   19.7 x 23.0   g' > 16.7, Rc > 16.7, Ic\n> 16.1   13:40:16  31 March\nField 18  5:59:51, +16:37:12   23.2 x 23.7   g' > 16.1, Rc > 15.9, Ic\n> 16.2   13:26:25  31 March\nField 19  6:06:18, +17:25:00   21.2 x 23.4   g' > 17.5, Rc > 16.9, Ic\n> 16.1   13:19:37  31 March\nField 20  6:01:30, +15:49:24   23.2 x 23.7   g' > 16.4, Rc > 16.1, Ic\n> 16.4   13:05:12  31 March\nField 21  5:59:52, +16:13:44   23.4 x 23.8   g' > 16.6, Rc > 16.4, Ic\n> 16.6   10:24:38    1 April\nField 22  6:08:11, +16:37:38   23.6 x 23.7   g' > 16.6, Rc > 16.5, Ic\n> 16.8   10:45:45    1 April\nField 23  6:03:13, +17:49:19   23.5 x 23.7   g' > 15.5, Rc > 15.2, Ic\n> 15.2   14:08:53  31 March\nField 24  6:08:14, +17:01:33   23.3 x 23.7   g' > 16.6, Rc > 16.5, Ic\n> 16.7   11:06:53    1 April\nField 25  6:04:33, +17:48:39   19.1 x 22.7   g' > 17.0, Rc > 17.0, Ic\n> 16.4   13:51:43  31 March\n-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------\n\nWe used GSC2.3 and UCAC4 catalog for flux calibration.",
  "circularId": 24047,
  "createdOn": 1554385896000,
  "email": "adachi@hp.phys.titech.ac.jp",
  "subject": "GRB 190330A: MITSuME Akeno and Okayama optical upper limits",
  "submitter": "Adachi Ryo at Tokyo Institute of Tech  <adachi@hp.phys.titech.ac.jp>",
  "eventId": "GRB 190330A"
}