//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27374 SUBJECT: GRB 200313A: Fermi GBM Final Real-time Localization DATE: 20/03/13 01:51:55 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 01:41:36 UT on 13 Mar 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200313A (trigger 605756501.620896 / 200313071). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 75.8, Dec = 20.9 (J2000 degrees, equivalent to J2000 05h 03m, 20d 53'), with a statistical uncertainty of 1.0 degrees. The angle from the Fermi LAT boresight is 103.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200313071/quicklook/glg_skymap_all_bn200313071.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/bn200313071/quicklook/glg_healpix_all_bn200313071.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200313071/quicklook/glg_lc_medres34_bn200313071.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27377 SUBJECT: GRB 200313A: BALROG localization (Fermi Trigger 605756501 / GRB 200313071) DATE: 20/03/13 02:46:49 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 605756501 at 01:41:36 on 13 March 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) = 76.4+/-0.4 deg Decl.(2000.0) = 21.7+/-0.3 deg We estimate an additional systematic error of 2 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB200313071/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB200313071/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB200313071/json //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27383 SUBJECT: GRB 200313A: Fermi GBM detection DATE: 20/03/13 19:20:45 GMT FROM: Stephen Lesage at Fermi-GBM Team S. Lesage (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 01:41:36.62 UT on 13 March 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 200313A (trigger 605756501 / 200313071). The location for this GRB was reported in the Fermi GBM Final Real-time Localization GCN (GCN 27374). The GBM light curve shows a single broad peak with a duration (T90) of about 13.6 s (50-300 keV). The time-averaged spectrum from T0 s to T0+22.5 s is best fit by a Band function with Epeak = 279 +/- 10 keV, alpha = -0.64 +/- 0.02, and beta = -1.84 +/- 0.02. The event fluence (10-1000 keV) in this time interval is (7.37 +/- 0.05)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+2.4 s in the 10-1000 keV band is 57.0 +/- 0.7 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: 27385 SUBJECT: IPN triangulation of GRB 200313A DATE: 20/03/15 16:56:10 GMT FROM: Dmitry Svinkin at Ioffe Institute K. Hurley, on behalf of the IPN, I. G. Mitrofanov, D. V. Golovin, A. S. Kozyrev, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team, D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team, A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM team, A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB 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 GRB 200313A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 27374; Lesage and C. Meegan, GCN Circ. 27383; BALROG localization: Biltzinger et al., GCN Circ. 27377) has been detected by Fermi (GBM trigger 605756501), Konus-Wind, INTEGRAL (SPI-ACS), and Mars-Odyssey (HEND), so far, at about 6097 s UT (01:41:37). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 73.028 (04h 52m 06s) +24.623 (+24d 37' 24") Corners: 73.480 (04h 53m 55s) +29.123 (+29d 07' 21") 73.078 (04h 52m 19s) +35.837 (+35d 50' 13") 72.077 (04h 48m 18s) +29.401 (+29d 24' 04") 72.972 (04h 51m 53s) +19.772 (+19d 46' 18") 74.907 (04h 59m 38s) +13.551 (+13d 33' 02") 74.212 (04h 56m 51s) +20.241 (+20d 14' 26") --------------------------------------------- The error box area is 18.9 sq. deg, and its maximum dimension is 22 deg (the minimum one is 1.2 deg). The Sun distance was 81 deg. This box may be improved. The localization is consistent with, but reduces the area of, the final Fermi-GBM (GCN Circ. 27374) and BALROG (GCN Circ. 27377) localizations. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB200313_T06098/IPN/ The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27399 SUBJECT: Konus-Wind observation of GRB 200313A DATE: 20/03/17 13:49:15 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 200313A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 27374; Lesage and C. Meegan, GCN Circ. 27383; BALROG localization: Biltzinger et al., GCN Circ. 27377; IPN triangulation: Hurley et al., GCN Circ. 27385) triggered Konus-Wind at T0=6098.088 s UT (01:41:38.088). The burst light curve shows a multipeaked structure which starts at ~T0-0.4 s and has a total duration of ~43 s. The emission is seen up to ~6 MeV. As observed by Konus-Wind, the burst had a fluence of 1.46(-0.14,+0.15)x10^-4 erg/cm2, and a 64-ms peak flux, measured from T0+2.528 s, of 3.42(-0.52,+0.53)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+45.824 s) is best fit in the 20 keV - 6 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.88(-0.10,+0.12), the high energy photon index beta = -2.07(-0.17,+0.12), the peak energy Ep = 442(-66,+77) keV (chi2 = 70/75 dof). The spectrum near the maximum count rate (measured from T0+2.048 to T0+3.072 s) is best fit in the 20 keV - 6 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.69(-0.13,+0.17), the high energy photon index beta = -2.24(-0.21,+0.16), the peak energy Ep = 424(-69,+70) keV (chi2 = 61/58 dof). The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB200313_T06098/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.