//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27363 SUBJECT: GRB 200311A: Fermi GBM Final Real-time Localization DATE: 20/03/11 15:24:19 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 15:16:12 UT on 11 Mar 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200311A (trigger 605632577.928052 / 200311636). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 204.0, Dec = -49.7 (J2000 degrees, equivalent to J2000 13h 35m, -49d 42'), with a statistical uncertainty of 1.0 degrees. The angle from the Fermi LAT boresight is 122.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200311636/quicklook/glg_skymap_all_bn200311636.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/bn200311636/quicklook/glg_healpix_all_bn200311636.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200311636/quicklook/glg_lc_medres34_bn200311636.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27365 SUBJECT: GRB 200311A: AGILE/MCAL and scientific ratemeters observations DATE: 20/03/11 18:54:28 GMT FROM: Alessandro Ursi at INAF/IAPS A. Ursi (INAF/IAPS), F. Longo (Univ. Trieste and INFN Trieste), M. Pilia (INAF/OA-Cagliari), C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, G. Piano (INAF/IAPS), F. Lucarelli (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani (INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team: The AGILE satellite detected the long burst GRB 200311A reported by Fermi/GBM (GCN #27363), that also triggered the automatic AGILE Mini-CALorimeter (MCAL) GRB alert Notice (ID 511024575), published at: https://gcn.gsfc.nasa.gov/agile_mcal.html. The event is visible in the scientific ratemeters (RMs) of the Anti-Coincidence (AC, 50-200 keV) and MCAL (0.4-100 MeV) detectors. The burst light curve shows a multi-peaked profile, lasting ~25 s and releasing ~33000 counts in the MCAL RMs. The ratemeters light curves can be found at http://www.agilescienceapp.it/notices/GRB_066883_511024575.756958_RM.png. The event also triggered an MCAL data acquisition at T0 = 2020-03-11 15:16:15.75 +/- 0.01 s (UTC), lasting ~10 s and releasing a total number of ~7550 counts in the detector, above a background rate of ~700 Hz. The MCAL light curve can be found at: http://www.agilescienceapp.it/notices/GRB_066883_511024575.756958.png. The AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive in the energy range 0.4-100 MeV. Additional analysis of AGILE data is in progress. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27371 SUBJECT: GRB 200311A: AstroSat CZTI detection DATE: 20/03/12 08:29:18 GMT FROM: Soumya Gupta at IUCAA/ASTROSAT S. Gupta, V. Sharma, A. Vibhute and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data showed the detection of a GRB 200311A, which was also detected by Fermi GBM (GCN #27363), AGILE/MCAL (Ursi A. et al., GCN #27365) and Global MASTER-Net (Lipunov V. et al., GCN #27370). The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with the strongest peak at 2020-03-11 15:16:13.516 UT. The measured peak count rate associated with the burst is 958 +/- 38.4 cts/s above the background in the combined data of four quadrants, with a total of 10660 +/- 42.9 cts. The local mean background count rate was 532 +/- 1.0 cts/s. Using cumulative rates, we measure a T90 of 30.5 +/- 0.03 s. In preliminary analysis, we find that 1186 Compton events are associated with this event. It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. 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: 27381 SUBJECT: IPN triangulation of GRB 200311A DATE: 20/03/13 12:49:49 GMT FROM: Dmitry Svinkin at Ioffe Institute IPN triangulation of GRB 200311A D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team, K. Hurley, on behalf of the IPN, A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM team, and A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, report: The long-duration GRB 200311A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 27363; AGILE-MCAL detection: Ursi et al., GCN Circ. 27365; AstroSat-CZTI detection: Gupta et al., GCN Circ. 27371) was detected by Fermi (GBM trigger 605632577), Konus-Wind, INTEGRAL (SPI-ACS), AGILE-MCAL, and AstroSat-CZTI at about 54973 s UT (15:16:13). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 209.245 (13h 56m 59s) -50.054 (-50d 03' 15") Corners: 206.898 (13h 47m 35s) -52.496 (-52d 29' 46") 211.898 (14h 07m 35s) -47.578 (-47d 34' 42") 211.296 (14h 05m 11s) -47.578 (-47d 34' 39") 206.215 (13h 44m 52s) -52.473 (-52d 28' 23") --------------------------------------------- The error box area is 2.0 sq. deg, and its maximum dimension is 6.1 deg (the minimum one is 21 arcmin). The Sun distance was 117 deg. This box may be improved. The IPN localization is consistent with, but reduces the area of, the Fermi-GBM final position (GCN Circ. 27363). A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB200311_T54974/IPN The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27398 SUBJECT: Konus-Wind observation of GRB 200311A DATE: 20/03/17 11:51:37 GMT FROM: Anna Ridnaia at Ioffe Institute A. Ridnaia, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report: The long-duration GRB 200311A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 27363; AGILE-MCAL detection: Ursi et al., GCN Circ. 27365; AstroSat-CZTI detection: Gupta et al., GCN Circ. 27371; IPN triangulation: Svinkin et al., GCN Circ. 27381) triggered Konus-Wind at T0=54974.737 s UT (15:16:14.737). The burst light curve shows a multipeaked structure which starts at ~T0-0.8 s and has a total duration of ~65.2 s. The emission is seen up to ~8 MeV. As observed by Konus-Wind, the burst had a fluence of 8.84(-0.76,+0.89)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+1.792 s, of 1.56(-0.28,+0.28)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+64.512 s) is best fit in the 20 keV - 8 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.93(-0.07,+0.08) and Ep = 854(-112,+142) keV (chi2 = 113/81 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.1 (chi2 = 112/80 dof). The spectrum near the maximum count rate (measured from T0+0.256 to T0+7.168 s) is best fit in the 20 keV - 8 MeV range by a power law with exponential cutoff model with alpha = -0.57(-0.08,+0.09) and Ep = 957(-98,+114) keV (chi2 = 88/80 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.2 (chi2 = 86/79 dof). The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB200311_T54974/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.