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