GRB 041006
GCN Circular 2832
Subject
GRB 041006: GETS Optical Afterglow Observation
Date
2004-11-05T04:25:03Z (21 years ago)
From
Kenzo Kinugasa at Gunma Astro. Obs/Japan <kinugasa@astron.pref.gunma.jp>
K. Kinugasa (Gunma Astronomical Observatory) and K. Torii (Osaka U.)
report:
Starting at 12:50:19 UT on 2004 October 6 (32 minutes after the burst
trigger), the sky area of GRB041006 (Galassi, et al. GCN 2770) was
observed with the GETS (0.25-m robotic telescope equipped with
unfiltered CCD in the Gunma Astronomical Observatory). The observation
continued for 6.5 hours and 30-s exposure frames were obtained.
We stacked 20 original frames into a single frame and find that the
optical afterglow (Da Costa, et al. GCN 2765) is detected in the
stacked frames. Between 12:57 and 14:55 UT (mean epoch), we obtained
10 independent measurements and the afterglow faded from Rc=17.8 to
Rc=18.7 by using a comparison star from Henden's calibration (GCN 2801).
After 15:02 UT, intermittent clouds came to cover the field of view and
the afterglow was not detected.
GCN Circular 2830
Subject
GRB 041006: Optical Observations
Date
2004-11-04T06:28:19Z (21 years ago)
From
Grant Williams at Steward Observatory <gwilliams@as.arizona.edu>
G. Williams, X. Fan, A. Diamond-Stanic, M. Bayliss, D. Reichart, S. Shaw,
A. Homewood, D. H. Hartmann, and M. Schwartz report on behalf of the MMTO,
U. North Carolina, and SARA GRB teams of the FUN GRB collaboration:
We observed the afterglow location (Da Costa et al., GCN 2765) of GRB
041006 (Galassi et al., GCN 2770) in Bg'VRc beginning 14.9 hours after the
burst. Using the field calibration of Henden (GCN 2801