[vsnet-grb-info 5330] GRB071025: Optical+NIR observations
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Tue Oct 30 08:02:11 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 7018
SUBJECT: GRB071025: Optical+NIR observations
DATE: 07/10/29 23:02:05 GMT
FROM: Paul Price at IfA,UH <price at ifa.hawaii.edu>
T. Minezaki (IoA, Tokyo), P.A. Price (IfA, Hawaii), Y. Yoshii (IoA,
Tokyo), L. Cowie (IfA, Hawaii) and Y. Kakazu (IfA, Hawaii) report:
We observed the optical afterglow of GRB071025 with the robotic MAGNUM
telescope + MIPS dual-beam imager. We find a fading source in each of
the RIYJHK bands at the position reported by Bloom et al. (GCN 6989):
Filter midtime(UTC) Exp. time magnitude/upper limits
J 2007-10-25 06:59 10 17.73 +- 0.06
R 2007-10-25 07:01 10 21.5 +- 0.4
Y 2007-10-25 07:21 9 detected
I 2007-10-25 07:21 10 19.97 +- 0.13
K 2007-10-25 07:43 8 16.67 +- 0.07
R 2007-10-25 07:43 10 > 20.9
H 2007-10-25 08:04 9 17.59 +- 0.08
I 2007-10-25 08:04 10 20.3 +- 0.2
J 2007-10-25 08:25 9 18.29 +- 0.10
R 2007-10-25 08:25 10 > 21.0
Y 2007-10-25 08:44 9 marginally detected
I 2007-10-25 08:44 10 20.5 +- 0.3
The magnitude and the 3-sigma upper limits were derived using the
USNO-B1.0 and 2MASS catalogues. The magnitude error does not include the
error of the calibration source. The Y-band observations have not been
calibrated.
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