//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 21998 SUBJECT: IPN Triangulation of GRB 171011B (long/very bright) DATE: 17/10/11 22:58:57 GMT FROM: Dmitry Svinkin at Ioffe Institute 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, D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Kozlova, and T. Cline on behalf of the Konus-Wind 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, 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, very bright GRB 171011B was detected by Konus-Wind, INTEGRAL (SPI-ACS), Mars-Odyssey (HEND), and Swift (BAT) at about 3935 s UT (01:05:35). The burst was outside the coded field of view of the BAT. We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 158.860 (10h 35m 26s) +1.646 ( +1d 38' 46") Corners: 159.793 (10h 39m 10s) -2.035 ( -2d 02' 06") 158.437 (10h 33m 45s) +4.418 ( +4d 25' 05") 158.940 (10h 35m 46s) +6.060 ( +6d 03' 36") 159.687 (10h 38m 45s) -0.726 ( +0d 43' 33") --------------------------------------------- The error box area is 2.646 sq. deg, and its maximum dimension is 8.14 deg (the minimum one is 23.5 arcmin). The Sun distance was 37 deg. This box may be improved. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB171011_T03931/IPN The time history and spectrum will be given in forthcoming GCN Circulars. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 22005 SUBJECT: Konus-Wind observation of GRB 171011B DATE: 17/10/12 13:27:38 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, P. Oleynik, M. Ulanov, A. Tsvetkova, A. Lysenko, A.Kozlova, and T. Cline on behalf of the Konus-Wind team, report: The long-duration, very intense GRB 171011B (IPN triangulation: Hurley et al., GCN Circ. 21998) triggered Konus-Wind at T0=3931.430 s UT (01:05:31.430). The burst light curve shows a multipeaked structure which starts at ~T0-7.3 s and has a total duration of ~18.2 s. The emission is seen up to ~20 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB171011_T03931/ As observed by Konus-Wind, the burst had a fluence of 7.02(-0.56,+0.57)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+1.456 s, of 5.55(-0.61,+0.62)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+10.496 s) is best fit in the 20 keV - 20 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.54(-0.12,+0.14), the high energy photon index beta = -2.28(-0.16,+0.12), the peak energy Ep = 315(-33,+37) keV (chi2 = 98/97 dof). The spectrum near the maximum count rate (measured from T0+0.256 to T0+1.792 s) is best fit in the 20 keV - 20 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.51(-0.11,+0.14), the high energy photon index beta = -2.59(-0.34,+0.21), the peak energy Ep = 416(-48,+50) keV (chi2 = 78/65 dof). All the quoted errors are at the 90% confidence level. All the quoted values are preliminary. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 22022 SUBJECT: GRB 171011B CALET Gamma-Ray Burst Monitor detection DATE: 17/10/18 11:57:19 GMT FROM: Takanori Sakamoto at AGU P. S. Marrocchesi (U of Siena), A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama, Y. Yamada, A. Tezuka, S. Matsukawa (AGU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), I. Takahashi (IPMU), Y. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), W. Ishizaki (ICRR), M. L. Cherry (LSU), S. Ricciarini (U of Florence), A. V. Penacchioni (U of Siena) and the CALET collaboration: The long-duration GRB 171011B (Hurley et al., GCN Circ. 21998; Svinkin et al., GCN Circ. 22005) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 01:05:36.47 on 11 October 2017. The burst signal was seen by the all CGBM instruments. The light curve of the SGM shows a single peak. The emission starts at T0 sec and the brightest pulse peaks at T+1.5 sec. The entire emission ends at T+3.5 sec. The T90 duration measured by the SGM data is 2.0 +- 0.3 sec (40-1000 keV). The light curve is available at http://cgbm.calet.jp/cgbm_trigger/flight/1191719089/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 22026 SUBJECT: GRB 171011B: Insight-HXMT detection DATE: 17/10/19 09:45:28 GMT FROM: Juan Zhang at IHEP/CAS/POLAR J. Zhang, J. Y. Liao, C. K. Li, X. B. Li, Y. Huang, S. L. Xiong, C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, X. F. Lu, J. L. Zhao, C. L. Zou (IHEP), Y. J. Jin, Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, H. Y. Wang, M. Wu, Y. P. Xu, A. M. Zhang, Y. F. Zhang, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team: During the commissioning phase, at 2017-10-11T01:05:36 (T0), Insight-HXMT/HE detected GRB 171011B (trigger ID: HEB171011045) in a routine search of the data, which is also detected by CALET (Marrocchesi et al., GCN 22022) and INTEGRAL, etc. This burst has been localized by IPN triangulation (Hurley et al., GCN Circ. 21998). The Insight-HXMT light curve consists of multi-pulses with a duration (T90) of 1.6 s measured from T0+1.3 s to T0+2.9 s. The 20-ms peak rate, measured from T0+1.98 s, is 23852.4 cnts/sec. The total counts from this burst is 19179.3 counts. URL_LC: http://www.hxmt.org/images/GRB/HEB171011B_LC.pdf The time-averaged spectrum from T0-1 s to T0+7 s is adequately fit by a Band spectrum with alpha = 3.94 +/- 0.86, beta = -2.65 +/- 0.16 and E_peak = 339.29 +/- 19.71. The energy fluence is (5.45 +/- 0.24)E-05 erg/cm^2 in 200 - 5000 keV in this time interval. All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (record energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the telescope. The analysis results presented above are preliminary; final results will be published elsewhere. Insight-HXMT is the first Chinese space X-ray telescope, which was funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://www.hxmt.org/index.php/enhome .