TITLE: GCN CIRCULAR NUMBER: 10440 SUBJECT: GRB100219A Akeno and Okayama MITSuME Optical Observation DATE: 10/02/20 03:43:34 GMT FROM: Daisuke Kuroda at OAO/NAOJ D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), H. Nakajima, Y.Yatsu, Y.A.Mori, A.Endo, T. Shimokawabe, and N. Kawai(Tokyo Tech), S. Nagayama (NAOJ), M. Yoshida (Hiroshima) and K. Ohta (Kyoto) report on behalf of the MITSuME collaboration: We observed the field of GRB 100219A (Rowlinson et al. GCN 10430) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Akeno Observatory and Okayama Astrophysical Observatory. We found the afterglow at the XRT position (Holland et al. GCN 10432, Rowlinson et al. GCN 10435 and Evans et al. GCN 10437) in Rc and Ic band. The coordinates of the object are: RA(J2000.0) 10:16:48.50 (+- 0.5 arcsec) DEC(J2000.0) -12:34:00.6 (+- 0.3 arcsec) But we could not detect the optical afterglow previously reported by Holland and Rowlinson (GCN 10436) Photometric results and three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for flux calibration. Akeno Observatory: The observation started on 2010-02-19 15:17:30 UT (104s after the trigger). PDAY MID-UT T-EXP g' Rc Ic ----------------------------------------------------- 0.00471 15:22:34 540.0 19.8+-0.3 18.5+-0.3 ---------------------------------------------------- Okayama Astrophysical Observatory: The observation started on 2010-02-19 15:20:08 UT (262 sec after the trigger). PDAY MID-UT T-EXP g' Rc Ic ----------------------------------------------------- 0.00675 15:25:30 540.0 >19.1 >19.0 17.8+-0.2 0.01428 15:36:21 540.0 >19.1 >19.1 17.5+-0.1 0.02177 15:47:07 540.0 >19.1 18.4+-0.2 18.1+-0.3 0.06589 16:50:40 3000.0 >19.4 >19.7 18.9+-0.3 -----------------------------------------------------