GRB 020603

K. Hurley and T. Cline, on behalf of the Ulysses, Mars Odyssey, 
and Konus GRB teams,

I. Mitrofanov, D. Anfimov, A. Kozyrev, M. Litvak and A. Sanin on behalf of the
HEND/Odyssey GRB team,

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

W. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr, on behalf of
the GRS/Odyssey GRB team, report:

Ulysses, Konus-Wind, and HEND observed this burst at 64234 s.
As observed by Ulysses, it had a duration of ~1.5 s, which
probably places it in the short-duration, hard spectrum GRB category.
Its 25-100 keV fluence was ~6E-6 erg/cm^2, and its peak flux over
0.5 s was ~1.4E-6 erg/cm^2 s.  We have triangulated it to a
preliminary, 3 sigma error box whose area is ~ 25 square arcminutes,
whose coordinates are:

    RA(2000)                 DEC(2000)
 19 h 31 m 15.61 s      4 o 55 '   6.19 "  (CENTER)
 19 h 31 m 52.52 s      4 o 58 '  39.23 "  (CORNER)
 19 h 30 m 51.29 s      4 o 54 '   1.77 "  (CORNER)
 19 h 31 m 39.88 s      4 o 56 '  10.05 "  (CORNER)
 19 h 30 m 38.55 s      4 o 51 '  31.67 "  (CORNER)

This error box may be improved.

P.A. Price, B.P. Schmidt (RSAA, ANU) and T.S. Axelrod (Steward Obs, 
Arizona) report:

We have observed the error-box of GRB 020603 (Hurley et al., GCN #1409
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 )
with the robotic 50-inch telescope at Mount Stromlo Observatory,
commencing at 2002 June 5.69 UT.  Exposures consisted of 3x300 sec
integrations in MACHO_R, and cover the entire error box to a limiting
magnitude of R ~ 19 mag.  We do not find any optical afterglow candidate
within the error box on visual comparison with the second Digitised Sky
Survey.

This message may be cited.

K. Hurley and T. Cline, on behalf of the Ulysses, Mars Odyssey, 
and Konus GRB teams,

I. Mitrofanov, D. Anfimov, A. Kozyrev, M. Litvak and A. Sanin on behalf of the
HEND/Odyssey GRB team,

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

D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, C. Wigger, W. Hajdas,
and A. Zehnder, on behalf of the RHESSI GRB team, and

W. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr, on behalf of
the GRS/Odyssey GRB team, report:

The initial triangulation of this burst, given in GCN 1409
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 , was based
on the data of the only three spacecraft available at that time, and
therefore gave two alternate positions, one of which appeared to be
ruled out based on its ecliptic latitude.  However, this burst was also
observed by RHESSI.  The addition of this fourth spacecraft to the
triangulation indicates that the burst in fact must have originated
from the alternate error box.  The area of this error box is
approximately 19 square arcminutes and its coordinates are:

    RA(2000)                 DEC(2000)
 15 h 46 m 35.53 s    -22 o 15 '  12.95 "  (CENTER)
 15 h 46 m  2.21 s    -22 o 18 '  52.67 "  (CORNER)
 15 h 46 m 22.37 s    -22 o 18 '   4.94 "  (CORNER)
 15 h 46 m 48.71 s    -22 o 12 '  20.76 "  (CORNER)
 15 h 47 m  8.96 s    -22 o 11 '  32.14 "  (CORNER)

The other properties of the burst given in GCN 1409
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  have not
changed.

We regret the inconvenience which this error may have caused.

GRB 020603, R-band observation
-------------------------

J. M. Castro Cerón, ROA (San Fernando),
M. Pedani, TNG (La Palma)
J. Gorosabel and A. J. Castro-Tirado, IAA-CSIC (Granada)

report:

"We have imaged the central part of the updated IPN error box for
GRB 020603 (Hurley et al., GCN 1412
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 ) with the 3.58-m Telescope
Nazionale Galileo (+ DOLORES, 9.4' x 9.4' FOV) at La Palma.
A single R-band frame (300-s exposure time) was obtained on
Jun 6.135 UT (i.e. 57 hours after the GRB).  No new objects are
seen within the fraction of the error box imaged (about 80 %)
down to the DSS-2 (R-band) limiting magnitude."

This message is citeable

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

We observed the entire ~19 square arcminute error box of the ~1.5 second
duration GRB 020603 (GCN 1409
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 , 1412
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 ) with the 0.6 meter Morehead Observatory
telescope beginning 2.36 days after the burst.  We integrated without filter
for ~2800 seconds per pointing x 2 pointings through scattered cirrus and
relatively high airmass.

Visual comparison with the DSS reveals no transients down to our limiting
magnitude, which we estimate to be V ~ 18.5 mag.

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

We have acquired BVRcIc all-sky photometry for
an 11x11 arcmin field centered at the IPN coordinates
for the short/hard burst GRB020603 (Hurley et al., GCN 1409
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 )
with the USNOFS 1.0-m telescope on one photometric night.  Stars
brighter than V=14.0 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/grb020603.dat
The astrometry in this file is based on linear plate solutions
with respect to UCAC2.  The external errors are less than 100mas.
The photometry has potential zeropoint error of about 0.02mag.