[vsnet-grb-info 476] (fwd) GRB 021004: Optical observations

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

Date: Sat, 5 Oct 2002 19:15:23 +0530 (IST)
From: Tushar Prabhu <tpp@crest.ernet.in>
Subject: GRB 021004: Optical observations

G.C. Anupama, D.K. Sahu, B.C. Bhatt and T.P. Prabhu, (Indian Institute of
Astrophysics, Bangalore) report on behalf of a larger collaboration
optical observations of GRB 021004 obtained from the 2-m Himalayan Chandra
Telescope, Indian Astronomical Observatory, Hanle:

We have monitored GRB 021004 in BVRI bands and obtained spectra with a
resolution of 1.8 nm on 2002 October 4. The spectrum in the range of
500-1000 nm at October 4.883 UT shows z=1.38 and 1.60 reported in GCN
#1569 and also indicates a higher redshift of z=1.72. The absorption-lines
identified are:

Obs (A) ident (A)       z

5576    FeII 2343       1.38
6093    FeII 2343       1.60
6166    FeII 2586       1.38
6654    MgII 2796       1.38
6669    MgII 2803       1.38
6757    FeII 2599       1.60
7269    MgII 2796       1.60
7296    MgII 2803       1.60
7601    MgII 2796       1.72
7629    MgII 2803       1.72

Assuming the USNO star has R=15.64, the R magnitudes at the beginning and
end of observing run were:

2002 October 4.70 UT    R=17.44
             4.95 UT    R=18.59

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