GCN Circular 6088

S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks,
and T. Cline on behalf of the Konus-Wind team,

A. von Kienlin, G. Lichti, A. Rau, D. Gotz, and S. Mereghetti,
on behalf of the INTEGRAL GRB team,

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

K. Hurley, D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, C. Wigger,
W. Hajdas, and A. Zehnder, on behalf of the RHESSI GRB team,

and

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

An extremely intense short, hard GRB triggered Konus-Wind
at 2007-02-01 T0=55390.780 s UT (15:23:10.780).
It also triggered INTEGRAL-SPI-ACS. Swift-BAT observed it at a very high 
background level while entering the SAA.
The burst was Earth-occulted to Suzaku and RHESSI,
and Mars-occulted to Odyssey. Ulysses was off.

This burst had the highest peak count rate of any cosmic
GRB observed by Konus-Wind in 12 years of operation (SGR
bursts excluded).

The burst light curve shows a main multipeaked pulse
with a duration of ~0.15 s, which was followed by a much weaker softer 
pulse with a duration of ~0.08 s.
The burst demonstrates strong spectral evolution.

It was triangulated to the Wind-INTEGRAL annulus
centered at RA=114.847 (07h 39m 23s)  Dec=+23.826 (+23d 49' 33"),
whose radius is 83.626 +/- 0.160 deg (3 sigma).
The Konus ecliptic latitude response constrains the arrival direction
to a band between ecliptic latitudes +60 and +90 degrees.
Combined with the occultation data, this
constrains the arrival direction to that portion of the
annulus between RA, Dec = 13, +37 and 350, +62 degrees.

As observed by Konus-Wind the burst had a fluence of ~2x10^-5 erg/cm2 
and a peak flux of ~1x10^-3 erg/cm2/s (both in the 20-2000 keV range).
Epeak of the time-integrated spectrum is ~300 keV.

The K-W light curve of this GRB and IPN triangulation map can be seen
at http://www.ioffe.rssi.ru/LEA/GRBs/GRB070201_T55390/

Detailed spectral parameters will be reported later.