TITLE: GCN CIRCULAR NUMBER: 36677 SUBJECT: Konus-Wind detection of GRB 240615A (short/hard) DATE: 24/06/16 16:36:40 GMT FROM: Dmitry Frederiks at Ioffe Institute fred@mail.ioffe.ru
D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report:
The short GRB 240615A (The Fermi GBM team, GCN 36671; Swift/BAT-GUANO arcminute localization: DeLaunay et al., GCN 36672). triggered Konus-Wind (KW) at T0=64306.225 s UT (17:51:46.225).
The burst light curve shows a single pulse, which starts at ~T0-0.02 s and has a duration of ~0.1 s. The emission is seen up to ~2 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB240615_T64306/
As observed by Konus-Wind, the burst had the total fluence of 1.85(-0.49,+0.65)x10^-6 erg/cm^2 and a 16-ms peak energy flux, measured from T0, of 3.21(-0.89,+1.15)x10^-5 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst (measured from T0 to T0+0.128 s) is best fit in the 20 keV - 15 MeV range by a power law with exponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.55(-0.27,+0.37) and Ep = 878(-281,+441) keV (chi2 = 24.4/28 dof). Fitting this spectrum by a Band function yields the same values of alpha and Ep, and an upper limit on the high energy photon index beta of -2.15 (chi2 = 24.5/27 dof).
All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary.
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