[vsnet-grb-info 8050] GRB 090626: IPN localization

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9588
SUBJECT: GRB 090626:  IPN localization
DATE:    09/06/29 03:20:25 GMT
FROM:    Valerie Connaughton at MSFC  <valerie at nasa.gov>

S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P.
Oleynik, M. Ulanov, and D. Svinkin on behalf of the 
Konus-Wind and Konus-RF teams, and T. Cline on behalf of the Konus-Wind
team,

I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin,
on behalf of the HEND-Odyssey GRB team,

K. Yamaoka, M. Ohno, Y. Fukazawa, T. Takahashi, M. Tashiro, Y. Terada,
T. Murakami, K. Makishima, and Y. Hanabata on behalf of the Suzaku-WAM 
team,

A. von Kienlin, G. Lichti, and A. Rau on behalf of the
INTEGRAL SPI-ACS GRB team,

K. Hurley, on behalf of the INTEGRAL and Odyssey teams,

J. Cummings, D. Palmer, H. Krimm, S. Barthelmy, and N. Gehrels on behalf 
of the Swift-BAT team,  and

V. Connaughton, M.S. Briggs and C.A. Meegan on behalf of the Fermi 
GBM team


report: 

Suzaku-WAM, Konus-Wind, Konus-RF, Swift-BAT, Odyssey-HEND,
and INTEGRAL-SPI-ACS observed the long GRB 
090626 at about 04:32:08 UT (corresponding to the Fermi/GBM
trigger 267683530/ 090626: von Kienlin, GCN 9579; also detected by 
Fermi/LAT: Piron et al., GCN 9584).  The burst was outside the 
coded field-of-view of the Swift BAT.

Triangulation gives various annuli which are shown in the 
figure at:

ftp://ftp.nsstc.org/outgoing/mbriggs/ipn_090626/GRB090626_IPN_v2.png.

The Konus-Wind-GBM annulus is centered at 
RA(2000)=257.678 (17h 10m 43s)  Dec(2000)=-27.309 (-27d 18' 34"), with a
radius of 73.391 ± 0.246 deg (3 sigma).  The Konus-Wind-Odyssey
annulus is centered at RA(2000)=226.080 (15h 04m 19s) 
Dec(2000)=-16.554 (-16d 33' 13"), with a radius of 52.513 ± 0.163 deg 
(3 sigma).

These annuli intersect to form the following 
3-sigma error box:

-----------------------------------------------
   RA(2000), deg               Dec(2000), deg
-----------------------------------------------
Center:
  170.419 (11h 21m 41s)   -33.051 (-33d 03' 04")
Corners:
  170.543 (11h 22m 10s)   -32.147 (-32d 08' 48")
  170.207 (11h 20m 50s)   -32.836 (-32d 50' 11")
  170.305 (11h 21m 13s)   -33.942 (-33d 56' 31")
  170.633 (11h 22m 32s)   -33.264 (-33d 15' 51")

-----------------------------------------------

The error box area is 0.363 sq. deg (1307.6 sq. arcmin).
This error box may be improved.


The box contains the LAT location (Piron et al., GCN 9584),
so that the IPN localization confirms the LAT location 
and narrows it to a much smaller region.

The Konus-Wind-GBM and Konus-Wind-Odyssey IPN triangulation 
map superimposed with the LAT location (95% CL 
error, statistical only) is available at 

ftp://ftp.nsstc.org/outgoing/mbriggs/ipn_090626/loc_090626_ipn_teeny.gif.

We encourage follow-up observations of the overlapping region 
between the IPN box and the LAT error circle.