//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 18852 SUBJECT: IPN Triangulation of GRB 151229B (extremely intense/long) DATE: 16/01/11 19:48:08 GMT FROM: Dmitry Svinkin at Ioffe Institute S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, K. Hurley, on behalf of the IPN, I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team, A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report: The long-duration, extremely intense GRB 151229B has been detected by Konus-Wind, Swift (BAT), and INTEGRAL (SPI-ACS), so far, at about 77063 s UT (21:24:23). The burst was outside the coded field of view of the BAT. The burst was Mars-occulted to Odyssey. We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 66.759 (04h 27m 02s) -7.167 ( -7d 10' 00") Corners: 71.595 (04h 46m 23s) -10.885 (-10d 53' 06") 67.582 (04h 30m 20s) -8.217 ( -8d 13' 00") 62.910 (04h 11m 38s) -3.557 ( -3d 33' 27") 65.994 (04h 23m 59s) -6.129 ( -6d 07' 46") --------------------------------------------- The error box area is about 3 sq. deg, and its maximum dimension is 11.3 deg (the minimum one is 27 arcmin). The Sun distance was 136 deg. This box may be improved. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB151229_T77056/IPN/ The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 18854 SUBJECT: Konus-Wind observation of GRB 151229B DATE: 16/01/12 16:33:23 GMT FROM: Anastasia Tsvetkova at Ioffe Institute S. Golenetskii, R. Aptekar, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, A. Kozlova, and T. Cline on behalf of the Konus-Wind team, report: The long-duration, extremely intense GRB 151229B (IPN triangulation: Golenetskii et al., GCN Circ. 18852) triggered Konus-Wind at T0=77056.981 s UT (21:24:16.981). The burst light curve shows a bright multi-peaked pulse with a duration of ~10 s (from ~T0+5 s to ~T0+15 s). This extremely bright phase of the event passes into a weaker decaying tail, which can be traced out to ~T0+100 s. The emission in the main pulse is seen up to ~15 MeV. As observed by Konus-Wind, the burst had a fluence of 4.2(-0.1,+0.1)x10^-4 erg/cm2, and a 64-ms peak flux, measured from T0+10.064 s, of 7.1(-0.6,+0.6)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+28.672 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.65(-0.06,+0.06), the high energy photon index beta = -2.12(-0.03,+0.03), the peak energy 262(-13,+14) keV (chi2 = 120/93 dof) The spectrum near the maximum count rate (measured from T0+9.984 to T0+10.240 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.33(-0.14,+0.16), the high energy photon index beta = -2.51(-0.18,+0.14), the peak energy 290(-30,+33) keV (chi2 = 44/54 dof) The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB151229_T77056/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.