[vsnet-grb-info 698] GRB 030115: Further IR observations with IRSF/SIRIUS

[GCN Circulars <gcncirc@lheawww.gsfc.nasa.gov>]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  1830
SUBJECT: GRB 030115: Further IR observations with IRSF/SIRIUS
DATE:    03/01/21 05:17:19 GMT
FROM:    Nobuyuki Kawai at Tokyo Tech  <nkawai-grbs.4.hete2@ezweb.ne.jp>

D. Kato and T. Nagata (Nagoya U.) on behalf of the IRSF/SIRIUS team
(Nagoya U., NAOJ), and N. Kawai (Tokyo Tech) report:

We have made further imaging of the IR afterglow candidate (Levan et
al. GCN 1818) of GRB030115 (Kawai et al. GCN 1816) at J, H, and Ks
with IRSF/SIRIUS on 2003 Jan 17.1 UT, and confirmed fading of this
object in the three bands since the previous night (Kato et al. GCN
1825).

The photometry results on Jan 16 (revised from GCN 1825) and Jan 17
are:

2003   Jan 16.0 UT     Jan 17.1 UT

J      20.4 +- 0.2     21.5 +- 0.5
H      19.9 +- 0.3     20.4 +- 0.4
Ks     18.5 +- 0.2     19.1 +- 0.2

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