GRB 100122A

S.Sergienko, V.Yurkov
Blagoveschensk Educational State University, Blagoveschensk


E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, 
D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zemnukhov, 
M. Kornilov
Sternberg Astronomical Institute, Moscow State University

A. Tlatov, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory


V.Krushinski, I.Zalozhnih, T.Kopytova
Ural State University, Kourovka


K.Ivanov, S.Yazev, N.M.Budnev, E.Konstantinov, V.Lenok
Irkutsk State University


MASTER  robotic telescope (MASTER-Net: http://observ.pereplet.ru, 200
mm, FOV=8 square degrees (testing mode)) and  Very Wide Field Camera (D=50 
mm, 1000 square  degrees, 11 Mpx, 36" per pix, mounted on telescope) 
located at Blagoveschensk   was responted to the  GRB 100122A 
(Fermi-GBM  alert, TRIGGER_NUM: 285864459) 30 sec after first Notice time 
and 59 s after the GRB time . 
We have a number images with exposition from 5s to 180 s.
The image limit from telescope ~17m .
The image limit from Very Wide Filed Camera ~11.5.
Fermi GBM error box locate in   vicinity  Orion Nebula.
More accurate   error-box is required.
The image reduction is continued.

The one of the first nice images MASTER VWF camera (with Orion 
constalation and trees)  is available  at 
http://observ.pereplet.ru/images/GRB100122A/grb.html  .
The message may be cited.

mailto: lipunov@sai.msu.ru

A. von Kienlin (MPE), P. N. Bhat (UAH) and R. D. Preece (UAH)
report on behalf of the Fermi GBM Team:

"At 14:47:37.31 UT on 22 January 2010, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 100122A (trigger 285864459 / 100122616).

The on-ground calculated location, using the GBM trigger
data, is RA = 79.2 , DEC = -2.7 (J2000 degrees,
equivalent to 05h 16.8m, -2d 42'), with an uncertainty
of 1.3 degrees (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 45 degrees.

This burst was also independently detected by INTEGRAL SPI-ACS.


The GBM light curve consists of 2 pulses (a weak pulse at trigger followed
by a much larger pulse about 21 s later) with a duration (T90)
of about 6.6 s (8-1000 keV).
The time-averaged spectrum from T0-2.688 s to T0+25.984 s is
adequately fit by a Band function with Epeak = 45.6 +/- 1.5 keV,
alpha = -0.98 +/- 0.05, and beta = -2.31 +/- 0.03

(CSTAT 1673 for 478 d.o.f.).

The event fluence (8-1000 keV) in this time interval is
(1.00 +/- 0.01)E-05 erg/cm^2. The 1.0-sec peak photon flux measured
starting from T0+20.9 s in the 8-1000 keV band
is 10.44 +/- 0.07 ph/s/cm^2.

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