Gamma-ray Burst 180824A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN Circular #23174
  D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Kozlova, and T. Cline on behalf of the Konus-Wind team,
  K. Hurley, on behalf of the IPN,
  A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
  and
  S. Barthelmy, J. Cummings, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team, report:
  The short-duration GRB 180824A was detected by Konus-Wind, INTEGRAL (SPI-ACS), and Swift (BAT), at about 36319 s UT (10:05:19). 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:
     10.060 (00h 40m 14s) +56.619 (+56d 37' 09")
  Corners:
    357.831 (23h 51m 19s) +60.118 (+60d 07' 04")
      6.353 (00h 25m 25s) +58.199 (+58d 11' 58")
     18.977 (01h 15m 55s) +52.272 (+52d 16' 18")
     13.317 (00h 53m 16s) +54.952 (+54d 57' 07")
  ---------------------------------------------
  

  The error box area is 3.30 sq. deg, and its maximum dimension is 14.0 deg (the minimum one is 20.76 arcmin). The Sun distance was 105 deg.
  This box may be improved.
  A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB180824_T36319/IPN/
  The time history and spectrum will be given in forthcoming GCN Circulars.
• GCN Circular #23176
  V. Lipunov, E. Gorbovskoy, D. Vlasenko, N.Tiurina, V.Kornilov, A.Kuznetsov, V.Chazov, I. Gorbunov, D.Zimnukhov, D.Kuvshinov, P.Balanutsa, V.Vladimirov, Lomonosov Moscow State University,SAI
  A. Tlatov, V.Senik, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory
  D.Svinkin (Ioffe Institute, Sankt Petersburg)
  D. Buckley, South African Astronomical Observatory (SAAO)
  R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias (IAC)
  R. Podesta, F. Podesta, C. Lopez, C.Francile Observatorio Astronomico Felix Aguilar (OAFA)
  H.Levato, Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
  O. Gres, N.M.Budnev , Yu.Ishmuhametova Irkutsk State University (ISU)
  A. Gabovich, V. Yurkov, Yu. Sergienko Blagoveschensk Educational State University (BSPU)
  MASTER-Kislovodsk robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk Solar Station of the Pulkovo Observatory was starting survey on the IPN GRB180824A error-box (Svinkin et al., GCN #23174) 274 sec after notice time and 35665 sec after trigger time at 2018-08-24 19:59:44 UT. The 5-sigma upper limit on our first (180s exposure) set is about 18.9 mag .
  The galacitc latitude b = 0 deg.
  The observations made on zenit distance = 36 deg.The moon (97 % bright part) is 29 deg. above the horizon. The distance between moon and object is 87 The sun altitude is -32.9 deg. The object can be observed till sunrise at 2018-08-25 02:23:27
  There are several bright galaxy (d < 100 Mpc) in IPN error box:

      Galaxy name         |        center         | b_mag  |  dist
  -----------------------+-----------------------+--------+---------
    PGC089890             | (15.7675d , 54.0347d) | 14.178 | 88.7359
    2MASS00061177+5916507 | (1.54907d , 59.2808d) | 14.559 | 81.8258
    2MASS00095357+5859451 | (2.47322d , 58.9959d) | 14.733 | 32.3946
    2MASS00035040+5929552 | (0.96001d , 59.4987d) | 15.373 | 14.6266
  

  The MASTER-Kislovodsk cover map is available at http://www.pereplet.ru/lipunov/images/master_MAP_GRB180824A.jpg
  There is no OT detetcted.
  The message may be cited.
  
• GCN Circular #23180
  A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Lysenko, A. Kozlova and T. Cline on behalf of the Konus-Wind team, report:
  The short-duration GRB 180824A (IPN triangulation: Svinkin et al., GCN 23174) triggered Konus-Wind at T0=36319.887 s UT (10:05:19.887).
  The burst light curve shows a double-peaked structure with a total duration of ~2 s. The emission is seen up to ~1.2 MeV.
  As observed by Konus-Wind, the burst had a fluence of 1.02(-0.34,+0.41)x10^-6 erg/cm2, and a 64-ms peak energy flux, measured from T0+0.012 s, of 7.15(-3.46,+4.02)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
  The time-integrated spectrum of the main pulse (measured from T0 to T0+0.256 s) is best fit in the 20 keV - 16 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with  alpha = -0.04(-0.85,+1.65), and Ep = 375(-128,+267) keV (chi2 = 16/18 dof).
  The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB180824_T36319/
  All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.