GCN Circular 5027
Subject
GRB 060428B: KAIT observations
Date
2006-04-28T17:18:35Z (18 years ago)
From
Weidong Li at UC Berkeley KAIT/LOSS <weidong@astron.berkeley.edu>
From alex@wormhole.Berkeley.EDU Fri Apr 28 10:07:14 2006
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Date: Fri, 28 Apr 2006 10:07:13 -0700 (PDT)
From: Alex Filippenko <alex@astro.berkeley.edu>
Message-Id: <200604281707.k3SH7D222376@wormhole.Berkeley.EDU>
To: Weidong Li<wli@astro.berkeley.edu>
Subject: here it is, slightly edited
Status: R
Content-Length: 2096
W. Li, R. Chornock, N. Butler, J. Bloom, and A. V. Filippenko (University of
California, Berkeley), on behalf of the KAIT GRB team, report:
The robotic 0.76-m Katzman Automatic Imaging Telescope (KAIT)
at Lick Observatory observed GRB 060428B, detected with Swift
(Trigger 207399; Campana et al. GCN 5017). The automatic sequence
started at 08:57:50, 192 s after the burst. In a 15 s unfiltered
image, no afterglow candidate is detected to a limiting magnitude
of 18.7 (from comparison with the USNO B1.0 catalog). Our real-time
image processing software detected the optical afterglow candidate
reported by Price et al. (GCN 5019) in a 60 s unfiltered image started
at 642 s after the burst, with the following precise (+/- 0.3") position:
RA = 15:41:25.63 Dec = +62:01:30.3 (J2000.)
A table of photometry (3-sigma limits and detections) is reported
below. The photometry of the afterglow candidate suggests a flat
luminosity evolution from 10 to 35 minutes after the burst, but
we caution that the photometry may suffer larger uncertainties than
reported due to relatively poor detections and the contamination of a
nearby source.
======================================================================
Start UT t(GRB) exposure(s) Filter 3sigma-limit detection
08:57:50 192s 15.0 clear 18.7
08:58:27 229s 15.0 V 16.9
08:58:57 259s 15.0 I 17.2
08:59:28 290s 20.0 clear 19.0
09:00:04 326s 45.0 V 17.7
09:01:04 386s 45.0 I 18.3
09:02:05 427s 45.0 clear 19.2
09:03:07 489s 60.0 V 17.9
09:04:23 565s 60.0 I 18.3
09:05:40 642s 60.0 clear 19.58 +/- 0.13
09:10:51 953s 120.0 clear 19.64 +/- 0.13
09:18:51 1433s 240.0 clear 19.40 +/- 0.11
09:30:55 2157s 360.0 clear 19.52 +/- 0.11
========================================================================