[vsnet-grb-info 5302] GRB071021 : CFHT Ks-band observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6993
SUBJECT: GRB071021 : CFHT Ks-band observation
DATE:    07/10/25 06:55:17 GMT
FROM:    Yuji Urata at Saitama U  <urata at crystal.heal.phy.saitama-u.ac.jp>

Y. Urata (Saitama Univ.), K.Y. Huang (ASIAA), W.H. Ip (NCU), and 
L. Albert (CFHT/UH) on behalf of EAFON team:

"We have observed the field of GRB 071021 (Sakamoto et al., GCN 6958)
in Ks-band using the WIRCam instrument on the CFHT telescope.  We
marginally detected the afterglow (Castro-Tirado et al. GCNs 6968,
6971, Malesani et al. GCN 6972, Terada et al GCN 6976, Piranomonte et
al. GCN 6985).  The brightness derived from 2MASS stars is about Ks~21
at the mid time of the stacked image (2007-10-23-05:42). This result
suggests that the NIR afterglow show shallow decay between October 22
and 23. Further analysis and observations are in progress."

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