GCN Circular 12014
Subject
GRB 110503A optical observation
Event
Date
2011-05-16T15:06:57Z (15 years ago)
From
AAVSO GRB Network at AAVSO <matthewt@aavso.org>
Andrea Tasselli (Lincoln, Lincolnshire, UK) reports to the AAVSO
International High Energy Network the following optical observation of GRB
110503A (GCN Circ. #11991, Stamatikos et al.):
A. Tasselli (Lincoln, Lincolnshire, UK) reports a detection of GRB 110503A
at an unfiltered, Sloan r-derived magnitude of cr = 19.1 +/- 0.1 on 2011
May 05.9167 (JD 2455685.4167; midpoint of exposures), approximately 4
hours after the Swift trigger (GCN Circ. #11991, Stamatikos et al.).
Tasselli obtained 30 unfiltered images of 120 seconds exposure for a total
of 3600 seconds. Tasselli used a 0.2-meter Maksutov-Cassegrain (f/6.8)
with a Starlight SXV-H9 CCD camera. Photometry of the OT was done using
the Iris photometry package with an ensemble of six SDSS stars:
SDSS J085118.11+521119.2, r=14.756;
SDSS J085118.96+521055.4, r=15.565;
SDSS J085110.02+521104.6, r=17.177;
SDSS J085119.59+521406.2, r=13.871;
SDSS J085131.83+521343.8, r=13.893; and
SDSS J085110.53+521301.8, r=17.749.
The position of the OT was measured using the Astrometrica package with 55
UCAC3 reference stars, and was found to be
RA(J2000) = 08 51 06.2
Dec(J2000) = +52 12 30
in good agreement with other measurements.
The AAVSO International High Energy Network was made possible through
grants from the Charles Curry Foundation and NASA.