[AAVSO-HEN] GRB071112C: Errata of MITSuME Ic band photometry

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  7091
SUBJECT: GRB071112C: Errata of MITSuME Ic band photometry
DATE:    07/11/15 01:05:31 GMT
FROM:    Michitoshi Yoshida at Okayama Astrophysical Obs  <yoshida at oao.nao.ac.jp>

M. Yoshida, K. Yanagisawa, Y. Shimizu, S. Nagayama, H. Toda (OAO, NAOJ)
and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:

The Ic band photometry results reported in GCN 7082 are not correct.
The correct values are 1.5 magnitude brighter than those in GCN 7082.
We made a mistake in calculating the zero point magnitudes of our Ic
band frames. We also checked the results of other two bands (g' and Rc)
photometry carefully and found they are correct.

Please discard the results of GCN 7082. The reviced data are following.

Observation date: 2007-11-12 UT

start-UT  end-UT    mid-UT     exp-T  g'         Rc         Ic
---------------------------------------------------------------------
18:35:34  18:36:34  18:36:04   1min  17.1+-0.1  17.0+-0.1  16.4+-0.1
18:35:34  18:39:00  18:37:17   3min  17.2+-0.1  17.2+-0.1  16.5+-0.1
18:39:12  18:45:09  18:42:10   5min  17.9+-0.1  18.0+-0.1  17.1+-0.1
18:45:19  18:56:20  18:50:49   7min  18.8+-0.2  18.5+-0.2  18.1+-0.2
18:56:30  19:08:46  18:32:38  10min  19.3+-0.4  19.0+-0.2  >18.3
19:08:56  19:57:01  19:32:58  40min  >19.5      19.6+-0.2  >18.5
---------------------------------------------------------------------