[vsnet-grb-info 5212] GRB 071011: Optical Limit after 13.95hrs
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Sat Oct 13 10:54:59 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 6905
SUBJECT: GRB 071011: Optical Limit after 13.95hrs
DATE: 07/10/13 01:54:53 GMT
FROM: Myungshin Im at Seoul Nat U <mim at astro.snu.ac.kr>
M. Im, I. Lee (Seoul National University), and Y. Urata
(Saitama University) on behalf of the EAFON team:
Using the Mt. Lemmon (Arizona, US) 1.0m telescope
operated by the Korea Astronomy Space Science Institute,
we observed the field of GRB071011 (GCN 6882,
Barthelmy et al.) beginning at 02:37:30 UT on Oct 12,
or 13.95 hrs after the trigger.
A stacked image of 11, 5 min frames in the R-band
does not show the OT reported by Cenko et al. (6895),
Perley et al. (6898), Pandey et al. (6899), Iizuka
et al. (6900), and Xin et al. (6904).
Using USNO B1.0 R2mag of stars for photometric calibration,
we place the upper limit of the OT as R > 21.9 mag
(3-sigma, 6" aperture mag) 13.95 hrs after the trigger.
It appears that the OT faded beyond the R limit.
t_start (UT) Filter exp (sec) R-mag
-----------------------------------------------------
02:37:30 R 11x300 > 21.9mag (3-sigma)
We will report later, a more careful analysis of the BVRI
images taken during the same period.
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