GRB 051022 (=H3950): SXC Flight Localization is Valid
K. Tanaka, G. Ricker, J-L. Atteia, N. Kawai, D. Lamb, and S. Woosley,
on behalf of the HETE Science Team;
M. Arimoto, T. Donaghy, E. Fenimore, M. Galassi, C. Graziani, N.
Ishikawa, A. Kobayashi, J. Kotoku, M. Maetou, M. Matsuoka, Y.
Nakagawa, T. Sakamoto, R. Sato, T. Shimokawabe, Y. Shirasaki, S.
Sugita, M. Suzuki, T. Tamagawa, and A. Yoshida, on behalf of the HETE
N. Butler, G. Crew, J. Doty, 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;
M. Boer, J-F Olive, J-P Dezalay, and K. Hurley, on behalf of the HETE
The HETE team, after reviewing the the real-time messages from HETE
regarding GRB 051022(=H3950), believes that the SXC real-time
localization of this burst is valid. As reported in GCN Notices
beginning 118 seconds after the initial trigger and in GCN Circular
4131, the SXC real-time localization can be described as a circle
RA = 23h 56m 00s, DEC = +19d 35' 51" (J2000)
with a 90% confidence error radius of 2.5 arcminutes.
This SXC localization corresponds not only to the highest correlation
peak in the WXM error circle, but also to the highest correlation
peak in the entire SXC field-of-view. Therefore GRB 051022 was
sufficiently bright in soft X-rays that the SXC position was
determined independently of the WXM result.
In addition, there is good reason to believe that the duration of GRB
051022 is > 2-4 minutes and that there are periods of low emission
during the X-ray prompt emission. These indications, combined with
the upper limit of R > 20 by Cenko et al (GCN 4134), suggest that
searches at NIR and infrared wavelengths for a high redshift object
in the SXC error region would be of interest.