[vsnet-grb-info 4296] IPN localization of very bright long hard GRB 070207

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6089
SUBJECT: IPN localization of very bright long hard GRB 070207
DATE:    07/02/09 19:55:02 GMT
FROM:    Valentin Pal'shin at Ioffe Inst  <val at mail.ioffe.ru>

S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks
on behalf of the Konus-Wind and Konus-A teams,

T. Cline on behalf of the Konus-Wind team,

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

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

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

and

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
report:

A  very bright long hard GRB was observed at 2007-02-07 21:00:44 UT
by Konus-Wind, Swift-BAT, INTEGRAL-SPI-ACS, Suzaku-WAM, and Konus-A.
The Swift satellite was slewing to a new pre-planned target at the time 
of the burst so the BAT did not trigger and was not able to provide a 
position for the burst. This burst was not observed by Odyssey, probably 
due to Mars-occultation. RHESSI and Ulysses were off.

The burst started with a short precursor (with a duration of ~0.05 sec),
followed by a main episode of emission which shows steep rise
and many sharp peaks, which transformed at T-T0 ~18 s to a smooth tail
seen up to T-T0 ~70 s.

It was triangulated to two annuli, whose coordinates are
RA, Dec, Radius =
296.570 (19h 46m 17s), -20.358 (-20d 21' 27"),
70.549 +/- 0.071,
and
299.695 (19h 58m 47s), -23.210 (-23d 12' 35")
66.501 +/- 0.178 degrees (3 sigma) .

The Konus ecliptic latitude response constrains the arrival direction
to a band between ecliptic latitudes -46 and -30 degrees.

Combining all these data, we have triangulated
this burst to a single error box, whose corners are:

     RA, deg                  Dec, deg
1: 16.578 (01h 06m 19s)   -34.714 (-34d 42' 49")
2: 14.860 (00h 59m 26s)   -28.754 (-28d 45' 13")
3: 18.478 (01h 13m 55s)   -43.139 (-43d 08' 19")
4: 18.655 (01h 14m 37s)   -43.055 (-43d 03' 18")

As observed by Konus-Wind the burst had a 20 keV-10 MeV
fluence of ~3x10^-4 erg/cm2, and a hard
time-integrated spectrum with an Epeak ~2 MeV.

The K-W light curve of this GRB and IPN triangulation map can be seen
at http://www.ioffe.rssi.ru/LEA/GRBs/GRB070207_T75644/

Detailed spectral parameters will be reported later.