//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28636 SUBJECT: GRB 201016A: Fermi GBM Final Real-time Localization DATE: 20/10/16 00:38:14 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 00:27:49 UT on 16 Oct 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201016A (trigger 624500874.592646 / 201016019). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 174.3, Dec = -2.0 (J2000 degrees, equivalent to J2000 11h 37m, -2d 00'), with a statistical uncertainty of 1.0 degrees. The angle from the Fermi LAT boresight is 93.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201016019/quicklook/glg_skymap_all_bn201016019.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201016019/quicklook/glg_healpix_all_bn201016019.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201016019/quicklook/glg_lc_medres34_bn201016019.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28641 SUBJECT: GRB 201016A: BALROG localization (Fermi Trigger 624500874 / GRB 201016019) DATE: 20/10/16 03:30:21 GMT FROM: Jochen Greiner at MPE,Garching B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 624500874 at 00:27:49 on 16 Oct. 2020 were automatically fitted for spectrum and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427; Berlato et al. 2019, ApJ 873, 60). The best-fit position (1 sigma statistical errors) is: RA(2000.0) = 176.6+/-0.1 deg Decl.(2000.0) = -4.3+/-0.2 deg We estimate an additional systematic error of 1 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB201016019/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB201016019/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB201016019/json //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28646 SUBJECT: GRB 201016A: Fermi GBM detection DATE: 20/10/16 05:23:45 GMT FROM: Joshua Wood at MSFC/Fermi-GBM J. Wood (NASA/MSFC) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 00:27:49.59 UT on 16 October 2020, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 201016A (trigger 624500874 / 201016019). The on-ground calculated location, using the GBM trigger data, is RA = 174.3, DEC = -2.0 (J2000 degrees, equivalent to 11h 37m, -2d 00'), with an uncertainty of 1.0 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which we have characterized as a mixture of two Gaussians, one with a radius of 1.8 degrees (52% contribution) and one with a radius of 4.1 degrees (47% contribution) [A. Goldstein et al. 2020, ApJ, 895, 1] ). The angle from the Fermi LAT boresight at the GBM trigger time is 93 degrees. The GBM light curve consists of multiple pulses with a duration (T90) of about 3 s (50-300 keV). The time-averaged spectrum from T0+6.3 s to T0+9.4 s is best fit by a Band function with Epeak = 181 +/- 2 keV, alpha = -0.42 +/- 0.01, and beta = -2.75 +/- 0.03 The event fluence (10-1000 keV) in this time interval is (9.06 +/- 0.04)E-05 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+6.8 s in the 10-1000 keV band is 267.4 +/- 1.1 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/" //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28651 SUBJECT: GRB 201016A: AstroSat CZTI detection DATE: 20/10/16 11:27:57 GMT FROM: Soumya Gupta at IUCAA/ASTROSAT S. Gupta, V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (IUCAA/TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data showed detection of a bright long GRB 201016A, which was also detected by Fermi GBM Final Real-time (GCN #28636), BALROG (Biltzinger B. et al., GCN #28641) and Fermi GBM (Wood J. et al., GCN #28646). The source was clearly detected in the 40-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2020-10-16 00:27:56.500 UT. The measured peak count rate associated with the burst is 4218 +/- 68 cts/s above the background in the combined data of four quadrants, with a total of 8601 +/- 8 cts. The local mean background count rate was 488 +/- 1 cts/s. Using cumulative rates, we measure a T90 of 2.91 +/- 0.01 s. It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2020-10-16 00:27:56.000 UT. The measured peak count rate is 6766 +/- 89 cts/s above the background in the combined Veto data of four quadrants, with a total of 14638 +/- 12 cts. The local mean background count rate was 1422 +/- 1 cts/s. We measure a T90 of 3.05 +/- 0.01 s from the cumulative Veto light curve. CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28694 SUBJECT: GRB 201016A: Insight-HXMT/HE detection DATE: 20/10/20 00:41:34 GMT FROM: Ce Cai at IHEP C. Cai, C. Zheng, J. C. Liu, Q. Luo, S. Xiao, W. C. Xue, Q. B. Yi, Y. Q. Zhang, Y. Huang, C. K. Li, G. Li, X. B. Li, J. Y. Liao, X. Y. Song, S. L. Xiong, C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, A. M. Zhang, Y. F. Zhang, X. F. Lu, C. L. Zou (IHEP), Y. J. Jin, Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, M. Wu, Y. P. Xu, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team: At 2020-10-16T00:27:49.500 (T0), Insight-HXMT/HE detected GRB 201016A (trigger ID: HEB201016019) in a routine search of the data, which also triggered Fermi/GBM (Wood J. et al., GCN #28646) and AstroSat/CZTI (Gupta S. et al., GCN #28651). The Insight-HXMT/HE light curve mainly consists of multiple pulses with a duration (T90) of 3.36 s measured from T0+6.06 s. The 1-ms peak rate, measured from T0+7.47 s, is 20372 cnts/sec. The total counts from this burst is 57956 counts. URL_LC: http://twiki.ihep.ac.cn/pub/HXMT/GRBList/HEB201016019_lc.jpg All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (deposited 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. 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.