TITLE:   GCN CIRCULAR
NUMBER:  7999
SUBJECT: GRB 080721 : Lulin 2nd optical follow-ups
DATE:    08/07/23 03:05:45 GMT
FROM:    Yuji Urata at Saitama U  <urata@asiaa.sinica.edu.tw>

L-C Huang, T-W Chen, Y-T Chen (NCU)
K.Y Huang (ASIAA) and Y. Urata (Saitama U./ASIAA)
on behalf of the EAFON report;

"We made further optical observations for the optical afterglow of GRB
080721 (Marshall et al., GCN 7988; Chen et al., GCN 7990) using the
Lulin 1 m telescope. The single R-band image with 300 sec exposure
shows the afterglow well with R=21.3 (mid term of the exposure is
26.19 hours after the burst). Comparison with our previous report
(Chen et al. GCN 7990), the temporal decay index is ~1.0. This is
consistent with the result reported by Jakobsson et al. (GCN 7998).