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GCN Circular 2235

Subject
GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
Date
2003-05-20T01:58:52Z (21 years ago)
From
Don Lamb at U.Chicago <lamb@oddjob.uchicago.edu>
D. Lamb, G. Ricker, J-L Atteia, N. Kawai, and S. Woosley on behalf of
the HETE Science Team;

J. Doty, R. Vanderspek, G. Crew, J. Villasenor, G. Monnelly, N. Butler,
T. Cline, J. G. Jernigan, A. Levine, F. Martel, E. Morgan, G. Prigozhin,
G. Azzibrouck, J. Braga, R. Manchanda, and G. Pizzichini, on behalf of
the HETE Operations and HETE Optical-SXC Teams;

Y. Shirasaki, C. Graziani, T. Donaghy, M. Matsuoka, M. Suzuki, T.
Tamagawa, K. Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi,
T. Tavenner, Y. Nakagawa, D. Takahashi, R. Satoh, and Y. Urata, on
behalf of the HETE WXM Team;

M. Boer, J-F Olive, J-P Dezalay, C. Barraud and K. Hurley on behalf of
the HETE FREGATE Team;

write:

At 14:04:53.56 UTC (50693.56 UT) on 3 May 2003, the HETE FREGATE and
WXM instruments detected event H2716, a long, bright GRB.

The burst triggered FREGATE in the 30-400 keV energy band.  The WXM
flight software detected the GRB and calculated a location, which was
reported in a GCN Notice at 14:05:30 UT.  However, the direction of the
burst source was such that it illuminated only the Y-detector.
Consequently, the WXM flight localization was incorrect.

Ground analysis of the WXM data produced a localization that was
reported in a GCN Notice at 15:44:46 UT, 100 minutes after the burst.
The WXM ground localization SNR was 12.  The localization can be
expressed as a 90% confidence rectangle which is 24 arcminutes in width
and 4.5 degrees in length.  The coordinates of the center of the
rectangle are

WXM-Ground:  R.A. = +15h 59m 02s, Dec. = -33d 29' 18" (J2000),

and the corners of the rectangle lie at:

R.A. = 16h 09m 54s, Dec. = -33d 16' 26",
R.A. = 16h 09m 41s, Dec. = -33d 33' 40",
R.A. = 15h 48m 24s, Dec. = -33d 24' 25",
R.A. = 15h 48m 08s, Dec. = -33d 42' 43" (J2000).

The width of the rectangle corresponds to the localization of the burst
in the Y-camera, and the length of the rectangle corresponds to the
the constraints on the X location of the burst deduced from the
illumination pattern on the wires of the Y-detector.

The T_90 duration of the burst in the 30-400 keV band was > 10 s.

A light curve and skymap for GRB030519B will soon be provided at the
following URL:

http://space.mit.edu/HETE/Bursts/GRB030519B
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