GCN Circular 2063
Subject
GRB 030329: KAIT optical photometry
Date
2003-04-01T22:15:33Z (21 years ago)
From
Weidong Li at UC Berkeley KAIT/LOSS <weidong@astron.berkeley.edu>
Subject: GRB 030329: KAIT optical photometry
Weidong Li, Ryan Chornock, Saurabh Jha, and Alexei V. Filippenko (UC Berkeley)
report:
We have observed the GRB 030329 afterglow (Peterson & Price, GCN 1985) with
the Katzman Automatic Imaging Telescope (KAIT) on the nights of 2003 Mar 30
and 31 UT. 16 sets of UBVRI images were taken. Aperture photometry was
performed on the afterglow and some local standard stars in IRAF, and the
instrumental magnitudes were transformed to the standard BVRI system using
the calibration provided by Henden (GCN 2023). We have also applied color
corrections to the KAIT data based on well-measured color terms for the KAIT
filters. Due to the lack of U-band calibrations, only BVRI images were reduced.
Our R-band photometry is summarized in the table below. The errors quoted
include both the IRAF aperture photometry error and the magnitude
transformation error.
Table: KAIT R-band observations
t-t0 (hours) exptime mag err
16.5662 300.0 R 15.424 0.034
17.0989 150.0 R 15.448 0.032
17.4775 150.0 R 15.487 0.022
18.4173 150.0 R 15.618 0.028
18.7934 150.0 R 15.659 0.023
19.6814 300.0 R 15.724 0.023
20.1812 150.0 R 15.809 0.057
20.6912 150.0 R 15.825 0.016
21.0689 150.0 R 15.899 0.030
21.4514 150.0 R 15.907 0.035
21.8964 150.0 R 15.948 0.035
22.2831 150.0 R 15.965 0.037
22.6695 150.0 R 16.102 0.079
43.1320 300.0 R 16.560 0.031
44.6242 300.0 R 16.763 0.136 (observed under cloudy conditions)
45.9700 300.0 R 16.600 0.135 (observed under cloudy conditions)
This message may be cited.