Gamma-ray Burst 200907A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN Circular #28378
  A. Ursi (INAF/IAPS), 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, C. Pittori (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani (INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:
  The AGILE Mini-CALorimeter (MCAL) detected a short burst at T0 = 2020-09-07 14:24:24.73 +/- 0.01 s (UTC).
  The event lasted about 1.6 s and released a total number of ~350 counts in the detector (in the 0.4-100 MeV energy range), above an average background rate of 680 Hz.
  The light curve shows a single sharp peak and it can be found at http://www.agilescienceapp.it/notices/GRB_069464_526573464.733762.png .
  The event is also clearly visible in the AGILE Scientific Ratemeters of the SuperAGILE [SA; 18-60 keV], MiniCALorimeter [MCAL; 0.4-100 MeV], and AntiCoincidence [AC; 50-200 keV] detectors.
  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. Automatic MCAL GRB alert Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html.
• GCN Circular #28409
  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,
  A. Ridnaia, S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin, 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, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team,
  A. Ursi, F. Verrecchia, M. Tavani, N. Parmiggiani, C. Pittori, A. Bulgarelli, on behalf of the AGILE Team, and
  W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report:
  The short-duration GRB 200907A (AGILE/MCAL detection: Ursi et al., GCN 28378) was detected by AGILE (MCAL), Konus-Wind, INTEGRAL (SPI-ACS), Mars-Odyssey (HEND), and Swift (BAT) at about 51860 s UT (14:24:20). 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:
    141.475 (09h 25m 54s)  -1.433 ( -1d 26' 00")
   Corners:
    141.200 (09h 24m 48s)  -1.061 ( -1d 03' 41")
    141.151 (09h 24m 36s)  -1.497 ( -1d 29' 48")
    141.752 (09h 27m 01s)  -1.796 ( -1d 47' 45")
    141.799 (09h 27m 12s)  -1.366 ( -1d 21' 58")
   ---------------------------------------------
  

  The error box area is 986 sq. arcmin, and its maximum dimension is 55 arcmin (the minimum one is 24.5 arcmin). The Sun distance was 26 deg.
  This box may be improved.
  A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB200907_T51859/IPN
  The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.