Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 8646

IPN triangulation of short hard GRB 081209
2008-12-10T16:36:58Z (15 years ago)
Valentin Pal'shin at Ioffe Inst <>
S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and K. 
Hurley on behalf of the Konus-Wind team,

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

M. Marisaldi, F. Fuschino, E. Del Monte, Y. Evangelista, I. Lapshov, M. 
Rapisarda, and A. Giuliani, on behalf of the AGILE Team,

AGILE-MCAL, Swift-BAT, and Konus-Wind observed the short-duration hard 
spectrum GRB 081209 at about 23:31:56 UT (corresponds to the Fermi/GBM 
trigger 250558317). The burst was outside the coded field of view of the 
BAT and SuperAGILE. The burst light curve shows a single peak with a 
duration of ~0.2 sec.

Triangulation gives an annulus centered at RA(2000)=77.269 (05h 09m 05s) 
  Dec(2000)=+17.346 (+17d 20' 47"), whose radius is 48.435 +/- 0.181 deg 
(3sigma).  This intersects the GBM error circle (the Fermi-GBM ground 
position is RA(2000), Dec(2000) = 88.980d (+05h 55m 55s), +71.450d (+71d 
27' 00")) assuming its 3sigma uncertainty of 11.8 deg (7.8deg stat + 
3deg syst)) to form a long 3sigma error box whose corners are at
        RA(2000)                 Dec(2000)
  104.995 (06h 59m 59s)   +61.438 (+61d 26' 16")
  105.760 (07h 03m 02s)   +61.616 (+61d 36' 58")
   62.128 (04h 08m 31s)   +64.879 (+64d 52' 43")
   62.813 (04h 11m 15s)   +64.597 (+64d 35' 47") 

This error box may be improved.

Preliminary analysis of the Konus-Wind data yields
a burst fluence of ~2x10^-6 erg/cm2 (in the 20 keV - 3 MeV range),
and an Epeak of the time-integrated spectrum of ~1 MeV.

Detailed spectral parameters will be reported later.

The K-W light curve of this GRB and IPN triangulation map is
available at
Looking for U.S. government information and services? Visit