TITLE: GCN CIRCULAR NUMBER: 6088 SUBJECT: IPN localization of very intense short GRB 070201 DATE: 07/02/09 19:53:47 GMT FROM: Valentin Pal'shin at Ioffe Inst 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.