GRB 000429

K. Hurley, on behalf of the Ulysses GRB Team, S. Barthelmy and
R. M. Kippen on behalf of the BATSE GRB Team, T. Cline and E.
Mazets, on behalf of the NEAR and KONUS-WIND GRB Teams, and
F. Frontera, C. Guidorzi and E. Montanari, on behalf of the
BeppoSAX GRBM Team, report:

Ulysses, BATSE, Konus, NEAR, and the BeppoSAX GRBM observed
GRB000429 (BATSE 8087) at 36430 s UT.  As observed by Ulysses,
this burst had a duration of ~50 s, a 25-100 keV fluence of
~4 x 10^-6 erg/cm^2, and a 0.25 s peak flux of ~6 x 10^-7 erg/
cm^2 s.  We have localized this burst to a preliminary 3 sigma
error box with an area of ~90 sq. arcmin with the following
coordinates:

    RA(2000)                 DEC(2000)
  6 h 33 m 20.80 s     -4 o 24 '  49.24 "  (CENTER)
  6 h 32 m 49.24 s     -4 o 27 '   6.45 "  (CORNER)
  6 h 33 m 32.66 s     -4 o 18 '  40.36 "  (CORNER)
  6 h 33 m  8.98 s     -4 o 30 '  58.52 "  (CORNER)
  6 h 33 m 52.44 s     -4 o 22 '  32.36 "  (CORNER)

This error box can be refined considerably.

A. Henden (USRA/USNO) reports on behalf of the USNO GRB team:

We have acquired preliminary shallow UBVRcIc all-sky photometry for
an 11x11 arcmin field that covers the majority of the
error box for GRB000429 with the USNOFS 1.0-m telescope on one
marginally photometric night.  Stars brighter than
V=12 are saturated and should be used with care.
We have placed the photometric data on our anonymous ftp site:
ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb000429.dat
The current photometry has a potential external zero-point
error of about three percent.  The astrometry in this file
is based on linear plate solutions with respect to USNO-A2.0.
The internal errors are less than 100mas.
  Further calibration of this field will be performed if
an optical afterglow is identified.

A. Henden (USRA/USNO) reports on behalf of the USNO GRB Team:

We have imaged the IPN error box for GRB 000429
(Hurley et al. GCN #657
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 ) with the NOFS 1.0-m telescope on
000430.15 UT.  Since a CCD with 11x11arcmin field of view was
used with a single pointing, the extreme corners of the error
box were not imaged.  Conditions were marginal, with poor seeing,
low altitude and twilight sky.  A composite 20-minute I-band image
was examined against the POSS-II red plate.  No new objects are
seen down to the CCD frame limit of approximately I=19.0.