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GCN Circular 1868

IPN triangulation of GRB030215A and GRB030215B (annuli)
2003-02-17T18:56:08Z (21 years ago)
Kevin Hurley at UCBerkeley/SSL <>
K. Hurley and T. Cline, on behalf of the Ulysses and HETE GRB teams, 

A. von Kienlin, G. Lichti, and A. Rau, on behalf of the

G. Ricker, J-L Atteia, N. Kawai, D. Lamb, S. Woosley, J. Doty, R. Vanderspek, 
J. Villasenor, G. Crew, G. Monnelly, N. Butler, J.G. Jernigan, A. Levine, 
F. Martel, E. Morgan, G. Prigozhin, J. Braga, R. Manchanda, G. Pizzichini,
Y. Shirasaki, C. Graziani, M. Matsuoka, T. Tamagawa, K. Torii,
T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, T. Tavenner, T. Donaghy,
M. Boer, J-F Olive, and J-P Dezalay, on behalf of the HETE GRB team, report:

These two bursts were detected by the IPN at 40412 s 40588 s.
Their localizations are consistent with a common origin, although
given the uncertainties, this may be due to chance.

The first event was observed by INTEGRAL (SPI-ACS) and HETE-FREGATE.  Its
duration was approximately 30 seconds.  We have triangulated it to a
circle centered at RA, Decl (2000)= 260.895, +26.835 degrees, whose
radius is approximately 90 degrees.

Ulysses, INTEGRAL (SPI-ACS), and HETE-FREGATE  observed the second
event.  As observed by Ulysses, it had a duration of approximately 40
seconds, a 25-100 keV fluence of approximately  2E-05 erg/cm2, and a
peak flux of approximately  8.6E-07 erg/cm2 s over 0.50 seconds.

We have triangulated it to a preliminary annulus centered  at RA,
Decl(2000)= 172.201, +41.659 degrees, whose radius is 63.183 +/-  0.044
degrees (3 sigma ).

These localizations can be improved and/or constrained, but it is not
known at this point whether small error boxes can be derived for these
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