GRB 100701B

S. Foley (MPE)
reports on behalf of the Fermi GBM Team:

"At 11:45:23.07 UT on 01 July 2010, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 100701B (trigger 299677525 / 100701490).

The on-ground calculated location, using the GBM trigger
data, is RA = 45.49, DEC = -3.43 (J2000 degrees,
equivalent to 03 h 02 m, -03 d 26 '), with an uncertainty
of 1.0 degree (radius, 1-sigma containment,
statistical only; there is additionally a systematic
error which is currently estimated to be 2 to 3 degrees).

The angle from the Fermi LAT boresight is 107 degrees.

The GBM light curve consists of at least six main pulses
with a duration (T90) of about 27.5 (+/-0.9) s (8-1000 keV).
The time-averaged spectrum from T0-1.2 s to T0+32.7 s is
well fit by a power law function with an exponential
high energy cutoff.  The power law index is -0.99 (+/-0.02) and
the cutoff energy, parameterized as Epeak, is 1.85 (+/-0.16) MeV
(CSTAT 695.8 for 360 d.o.f.).

The event fluence (8-1000 keV) in this time interval is
(2.86 +/- 0.03)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+3.4 s in the 8-1000 keV band
is 22.6 +/- 0.3 ph/s/cm^2.

A Band function fits the spectrum equally well (CSTAT 689.8 for 359 d.o.f.)
with Epeak= 1.48 (+0.19/-0.17) MeV, alpha = -0.95 (+/-0.03) and beta =
-2.47 (+0.18/-0.25) .


The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."

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

J. Goldsten, and K. Hurley on behalf of the MESSENGER GRNS GRB team,

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

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

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, report:

The long bright GRB 100701B, seen by Fermi/GBM (Foley, GCN 10920
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 ), has 
also been detected by INTEGRAL (SPI-ACS), Suzaku (WAM),  Konus-Wind, and 
MESSENGER (GRNS) so far.

We have triangulated it to a 3 sigma error box whose coordinates are:
-----------------------------------------------
    RA(2000), deg              Dec(2000), deg
-----------------------------------------------
Center:
   43.109 (02h 52m 26s)    -2.224 (-02d 13' 25")
Corners:
   43.260 (02h 53m 02s)    -2.497 (-02d 29' 49")
   43.081 (02h 52m 19s)    -2.310 (-02d 18' 36")
   42.959 (02h 51m 50s)    -1.947 (-01d 56' 50")
   43.138 (02h 52m 33s)    -2.137 (-02d 08' 14")

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

The error box area is 149.7 sq. arcmin.
This error box may be improved.

The GBM position (Foley, GCN 10920
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 ) is 2.7 deg from the center of the box.

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

The long bright hard GRB 100701B (localized by IPN,
Golenetskii et al., GCN 10938
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 ) triggered Konus-Wind
at T0=42319.075s UT (11:45:19.075)

The burst light curve consists of several (>6) short
hard pulses with a total duration of ~15 s.
The emission is clearly seen up to 10 MeV.

The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB100701_T42319/

As observed by Konus-Wind the burst
had a fluence of 5.0(+/-0.85)x10-5 erg/cm2,
and a 256-ms peak flux measured from T0+3.584s
of 2.2+/-0.3)x10-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).

The time-integrated spectrum of the burst
(from T0 to T0+16.640 s) is best fit
in the 20 keV - 10 MeV range by the GRB (Band)
model, for which:
the low-energy photon index alpha = -0.90 (+/-0.10),
the high energy photon index beta = -2.7 ( <-2.1 ),
the peak energy Ep = 1186(-243, +294)keV (chi2 = 74.4/84 dof).

The spectrum at the maximum count rate
(measured from T0+0.256 to T0+8.848 s) is best fit
in the 20 keV - 10 MeV range by the GRB (Band)
model, for which:
the low-energy photon index alpha = -0.80 (+/-0.10),
the high energy photon index beta = -2.6 ( <-2.2 ),
the peak energy Ep = 1202(-217, +246)keV (chi2 = 90/84 dof).

All the quoted results are preliminary.
All the quoted errors are at the 90% confidence level.