GCN Circular 96
Subject
GRB980519 Secondary Standards
Date
1998-06-05T00:37:19Z (27 years ago)
From
Arne A Henden at USNO/USRA <aah@nofs.navy.mil>
The U. S. Naval Observatory GRB team (A. A. Henden, F. J. Vrba,
C. B. Luginbuhl, B. Canzian, S. E. Levine, H. H. Guetter, J. A. Munn)
report follow up optical photometry of the secondary standards
(see Jaunsen, et. al. GCN 78 and Bloom, et. al. GCN 87) in the field
of GRB980519. The observations were made on two photometric nights
during the past week with the USNO 1.0m telescope. Johnson BV and
Cousins RI filters were used, with an average of 32 Landolt standards
of wide color range and extinction observed on each night. The
transformations are accurate to 0.01-0.02mag per single observation.
DAOPHOT psf fitting was used in the GRB field, with magnitude
corrections to adjust the photometry to a standard aperture diameter.
Given below is the photometry, with errors based on the variance
between the two nights. More detail, including coordinates and
comparisons between other published values for these stars, can
be found on our Web site at:
http://psyche.usno.navy.mil/nofs/grb/grb980519.html
For further information contact A. A. Henden at aah@nofs.navy.mil or by
telephone at (520) 779-5132.
This GCN note can be cited.
ID B Berr V Verr R Rerr I Ierr
--------------------------------------------------------------
A 19.661 0.114 18.558 0.018 17.914 0.005 17.338 0.027
B 20.218 0.061 19.318 0.027 18.477 0.001
C 19.313 0.060 18.549 0.027 18.029 0.004 17.525 0.004
D 16.433 0.003 15.614 0.005 15.139 0.000 14.686 0.004
E 21.230 0.146 19.998 0.030 18.767 0.022
F 21.174 0.226 19.900 0.109 18.578 0.289
G 19.915 0.006 18.867 0.004 17.999 0.054
H 20.574 0.062 19.432 0.044 17.990 0.050
I 20.054 0.021 19.645 0.042 19.138 0.007
J 20.907 0.036 20.001 0.011 19.148 0.011