{
  "bibcode": "2020GCN.27744....1N",
  "body": "N. Nakamura, R. Hosokawa, R. Adachi, K. L. Murata, M. Niwano, F.\nOgawa, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the\nMITSuME collaboration:\n\nWe performed tiling observation for the MAXI/GSC error region of GRB\n200514A (Y. Okamoto et al., GCN Circular #27735; Ricciarini et al.,\nGCN Circular #27743) with an optical tri-color (g', Rc, and Ic) camera\nattached to the MITSuME 50cm telescopes at Akeno Observatory in Japan.\n\nThe follow up observation started at 2020-05-14 10:36:15 UT, 495\nminutes after the trigger.\n\nOur tiling observation covered almost ~65% of the MAXI/GSC error\nregion (GCN Circular #27735). Compared our co-added images with the\nGSC2.3 and UCAC4 catalogs, we found no bright optical transient in the\nobserved region except a high proper motion star (R.A.=11:20:26.73,\nDec.=+19:53:14) listed in the NEOWISE/AllWISE high proper motion\nobjects (Schneider et al. 2016). Because the elevation of the target\nfield had dropped from 75 deg to 16 deg during the observations and\nthe sky condition was unstable, the obtained upper limits are\ndifferent for each field. The 5-sigma upper limits of the co-added\nimages are listed below.\n\nField num. | center position(R.A., Dec.) | size of field(R.A.(arcmin)\nx Dec.(arcmin)) | 5-sigma upper limit | MID-UT(UT) | exposure\ntime(sec)\n-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------\nField 0 | 11:21:03, +19:43:24 | 24.9 x 25.9 | g' > 18.4, Rc > 18.2, Ic\n> 16.5 | 12:24:50 14 May | 870\nField 1 | 11:19:53, +19:52:19 | 25.6 x 26.1 | g' > 18.0, Rc > 17.7, Ic\n> 16.9 | 12:35:31 14 May | 480\nField 2 | 11:20:25, +19:26:36 | 25.8 x 25.9 | g' > 16.8, Rc > 16.7, Ic\n> 16.1 | 12:44:04 14 May | 1170\nField 3 | 11:19:15, +19:35:00 | 25.7 x 26.0 | g' > 18.3, Rc > 17.9, Ic\n> 17.1 | 12:05:44 14 May | 660\nField 4 | 11:21:41, +19:59:30 | 25.6 x 26.1 | g' > 17.8, Rc > 17.6, Ic\n> 16.7 | 11:18:32 14 May | 360\nField 5 | 11:20:30, +20:08:15 | 25.6 x 25.9 | g' > 18.0, Rc > 17.4, Ic\n> 16.8 | 12:33:09 14 May | 570\nField 6 | 11:19:49, +19:09:39 | 25.7 x 25.9 | g' > 18.7, Rc > 18.3, Ic\n> 17.5 | 12:11:34 14 May | 660\nField 7 | 11:18:42, +19:18:54 | 25.7 x 26.1 | g' > 18.0, Rc > 17.6, Ic\n> 16.8 | 11:26:50 14 May | 210\nField 8 | 11:21:55, +20:24:47 | 25.9 x 26.0 | g' > 17.1, Rc > 17.0, Ic\n> 15.9 | 16:21:30 14 May | 150\n-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------\nWe used the UCAC4 catalog for the flux calibration. The magnitudes are\nexpressed in the AB system. The images were processed in real-time\nthrough the MITSuME GPU reduction pipeline (Niwano et al., in prep;\nhttps://github.com/MNiwano/Eclair).",
  "circularId": 27744,
  "createdOn": 1589556939000,
  "email": "adachi@hp.phys.titech.ac.jp",
  "subject": "GRB 200514A: MITSuME Akeno optical upper limits",
  "submitter": "Adachi Ryo at Tokyo Institute of Tech  <adachi@hp.phys.titech.ac.jp>",
  "eventId": "GRB 200514A"
}