[vsnet-grb-info 5274] GRB 071021 : Lulin R-band limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6961
SUBJECT: GRB 071021 : Lulin R-band limit
DATE:    07/10/21 15:12:26 GMT
FROM:    Kuiyun Huang at ASIAA  <ljhuang at asiaa.sinica.edu.tw>

W.S. Hsiao, H.C. Lin , Y.H. Lee, Y. Urata, K.Y. Huang on behalf of the
EAFON team

The B,V,R band observations for GRB 071021 field with Lulin 1-m
telescope started at 1.38 hours after the burst. No source was found
at XRT position (Sakamoto et al.; GCN 6958) and optical candidate
position (Golenetskii et al.; GCN 6959) in our combined images. The
R-band limiting magnitude, compared with several USNOB stars, is about
20.4 at 1.87 hours after the burst . This result suggests that the
fading optical source reported by Golenetskii et al. (GCN 6959) is the
optical afterglow of GRB 071021.

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