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GCN Circular 2712

GRB040916 (= H3558): A Long XRF Localized by HETE
2004-09-16T03:01:51Z (20 years ago)
Roland Vanderspek at MIT <>
GRB040916 (= H3558):  A Long XRF Localized by HETE

T. Yamazaki, G. Ricker, J-L. Atteia, N. Kawai, D. Lamb, and S. Woosley, 
on behalf of the HETE Science Team; 

T. Donaghy, E. Fenimore, M. Galassi, C. Graziani, M. Matsuoka, 
Y. Nakagawa, T. Sakamoto, R. Sato, Y. Shirasaki, M. Suzuki, 
T. Tamagawa, Y. Urata, Y. Yamamoto, and A. Yoshida, on behalf of the 

N. Butler, G. Crew, J. Doty, A. Dullighan, G. Prigozhin, R. Vanderspek, 
J. Villasenor, J. G. Jernigan, A. Levine, G. Azzibrouck, J. Braga, 
R. Manchanda, and G. Pizzichini, on behalf of the HETE Operations and 
HETE Optical-SXC Teams; 

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


At 00:03:30 UT (209 SOD) on 16 September 2004, the WXM instrument
on HETE detected GRB040916 (= H3558), a long, two-peaked XRF.  The 
burst has been localized to a circle of 18' radius centered on

  RA = 23h 01m 44s, Dec = -5d 37' 43" (J2000)

The burst consists of two peaks separated by ~250s, each ~100s in 
duration.  No formal spectral analysis has been performed using WXM
data, but the dearth of counts in bands > 10 keV in either peak is a 
strong indication that GRB040916 is an XRF.

We anticipate providing additional spectral information from this 
unusual event in a subsequent GCN Circular.

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