GRB 020525

K. Hurley, on behalf of the Ulysses GRB team,

E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team,

I. Mitrofanov, D. Anfimov, A. Kozyrev, M. Litvak, and A. Sanin, 
on behalf of the HEND/Odyssey GRB team,
 
W. Boynton, C. Fellows, K. Harshman, C. Shinohara, and R. Starr, 
on behalf of the GRS/Odyssey GRB team, and

T. Cline, on behalf of the Ulysses, Konus, and MO GRB teams, report:

Ulysses, Konus, and MO-HEND observed this burst at 20164 s.
As observed by Ulysses, it had a duration of ~25 s, a 25-100 keV
fluence of 1E-5 erg/cm^2, and a peak flux over 0.5 s of 8E-7
erg/cm^2 s.  Triangulation gives a preliminary ~25 sq. arcmin. error box
(3 sigma) whose coordinates are:

11 h 29 m 32.93 s    -20 o 21 '  05.28 " (CENTER)
11 h 29 m 28.52 s    -20 o 23 '  09.64 " (CORNER)   
11 h 29 m 57.73 s    -20 o 21 '  44.51 " (CORNER)   
11 h 29 m  8.15 s    -20 o 20 '  25.79 " (CORNER)   
11 h 29 m 37.34 s    -20 o 19 '  00.91 " (CORNER)

This error box may be improved.

A. Henden (USRA/USNO), on behalf of the USNOFS GRB team,
and P. Nelson (Ellinbank Observatory, Victoria),
on behalf of the AAVSO International GRB Network, report:

We have observed the entire IPN error box for
GRB020525 (Hurley et al., GCN 1395
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 ) using unfiltered
exposures.  The NOFS 1.0m observations were made at
relatively high airmass, with scattered cirrus and
full moon; the Ellinbank 0.3m observations had clear
conditions but with full moon interference.
   This field is at galactic coordinates
278.1d longitude and 38.6d latitude and has several
faint galaxies.  Comparing with USNO-A and the USNO PMM
scans of the southern R plate, we find no new objects
to the plate limit.  The log of observations:

  UTmid      exp     tel   mlim
020528.178   9x5min  1.0m  22
020528.518  6x20min  0.3m  19

The brightest object not on the photographic plate is
at
      11:29:30.49  -20:18:41.9  J2000

but may be non-stellar.

M. Nysewander, L. Johnson, D. Moschler, J. Richuso, J. Rose (U. North 
Carolina), and D. Reichart (Caltech) report:

We observed ~95% of the ~25 square arcminute error box of GRB 020525 (GCN 1395
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 ) 
with the 0.6-meter Morehead Observatory telescope beginning 2.95 days after the 
burst.  We integrated without filter for 2460 seconds under poor observing 
conditions (scattered cirrus, relatively high air mass, and a nearly full 
moon).

Visual comparison with the DSS reveals no transients down to our limiting 
magnitude, which we estimate to be V ~ 17 mag.  This is consistent with the 
deeper searches of Henden et al. (GCN 1397
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 ).