GRB 000727
GCN Circular 754
Subject
IPN localization of GRB000727
Date
2000-07-28T18:15:17Z (25 years ago)
From
Kevin Hurley at UCBerkeley/SSL <khurley@sunspot.ssl.berkeley.edu>
K. Hurley, on behalf of the Ulysses GRB team, E. Mazets and S. Golenetskii,
on behalf of the Konus-Wind GRB team, and T. Cline, on behalf of the
NEAR and Konus-Wind GRB teams, report:
Ulysses, Konus-Wind, and NEAR detected this burst at 70956 s UT.
As observed by Ulysses, it had a duration of ~10 s, a 25-150 keV
fluence of 2.6 x 10^-6 erg/cm^2, and a peak flux over 0.5 s
of 4.3 x 10^-6 erg/cm^2 s^-1. We have localized it to a
preliminary 3 sigma error box whose area is ~25 sq. arcmin. and
whose coordinates are:
RA(2000) DEC(2000)
11 h 45 m 10.54 s 17 o 24 ' 34.44 " (CENTER)
11 h 45 m 14.07 s 17 o 25 ' 11.88 " (CORNER)
11 h 44 m 35.46 s 17 o 31 ' 24.63 " (CORNER)
11 h 45 m 45.47 s 17 o 17 ' 43.53 " (CORNER)
11 h 45 m 7.01 s 17 o 23 ' 56.99 " (CORNER)
This error box can be refined.
(NOTE: Ulysses and NEAR have had very high background rates
for the past several weeks due to solar protons, which explains
the the recent decrease in the IPN event rate. Both instruments
have now returned to their normal background rates.)
GCN Circular 755
Subject
GRB 000727, optical observations
Date
2000-07-29T20:08:47Z (25 years ago)
From
Arne A. Henden at USNO/USRA <aah@nofs.navy.mil>
A. Henden (USRA/USNO) reports on behalf of the USNO GRB team:
We have imaged the entire IPN error box (Hurley, et al. GCN 754)
for GRB 000727 with the NOFS 1.0-m telescope with a
Tektronix 2048x2048 CCD and Cousins R filter. Conditions
were marginal with poor seeing, bright sky and light cirrus.
Compared against the POSS-II red plate, we reach approximately
the same depth. Only one, very marginal, object appears on
our frame but does not appear on the POSS-II scan. This
object is likely just a red star, but is reported here for
completeness. The J2000 coordinates and USNO-A2.0 red
magnitude are:
11:45:26.90 +17:22:20.9 20.7 +/- 0.3
The magnitude is based on the bright star just to the south
at J2000 position and USNO-A2.0 red magnitude of:
11:45:27.84 +17:21:33.1 15.70
A 4.5x4.5 arcmin finding chart for this object is
embarrassingly given at:
ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb000727.jpg