//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 10354 SUBJECT: GRB 100122A: MASTER-Net optical observations DATE: 10/01/22 16:50:16 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs 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 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 10355 SUBJECT: GRB 100122A: Fermi GBM detection DATE: 10/01/23 02:32:50 GMT FROM: Narayana Bhat at U Alabama/Huntsville/GBM 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."