Konus-Wind detection of GRB 240513A

The long-duration GRB 240513A (AstroSat CZTI detection: Joshi et al., GCN 36455; Fermi-LAT detection: Cutini et al., GCN 36462; Fermi-GBM observation: Bissaldi & Meegan, GCN 36479) triggered Konus-Wind at T0=26527.128 s UT (07:22:07.128). The burst light curve shows a multipeaked structure which started at ~T0-5.3 s and had a total duration of ~7.8 s. KW triggered on the second of two emission episodes reported in GCN 36479, this episode had a total duration of ~2.6 s. The emission is seen up to ~6 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB240513_T26527/ As observed by Konus-Wind, the burst had a fluence of 3.42(-0.39,+2.50)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0-0.066 s, of 5.12(-0.78,+2.09)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). Since the brightest part of the burst emission was detected before the trigger, the spectral analysis was performed using the KW 3-channel light curve data. Modelling the KW 3-channel time-integrated spectrum (measured from T0-5.339 s to T0+2.512 s) by a power law with exponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep), yields alpha = -1.00(-0.22,+0.26) and Ep = 732(-249,+745) keV. All the quoted errors are at the 68% confidence level. All the quoted values are preliminary.