TITLE: GCN CIRCULAR NUMBER: 30048 SUBJECT: Konus-Wind detection of GRB 210514A DATE: 21/05/18 18:03:52 GMT FROM: Anna Ridnaia at Ioffe Institute A. Ridnaia, D. Frederiks, S. Golenetskii, A. Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, report: The long-duration GRB 210514A (Swift-BAT detection: Ambrosi et al., GCN 30008; Lien & Ambrosi, GCN 30009; Markwardt et al., GCN 30018; CALET-CGBM detection: Sakamoto et al., GCN 30035) triggered Konus-Wind at T0=66225.021 s UT (18:23:45.021). The burst light curve shows a multipeaked structure started at ~T0-0.3 s with a total duration of ~74.2 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/GRB210514_T66225/ As observed by Konus-Wind, the burst had a fluence of 1.97(-0.43,+0.56)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+1.168 s, of 6.70(-3.12,+3.85)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+49.408 s) is best fit in the 20 keV - 2 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.38(-0.40,+0.88), the high energy photon index beta = -2.27(-0.42,+0.23), the peak energy Ep = 118(-24,+40) keV (chi2 = 66/55 dof). The spectrum near the maximum count rate (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 2 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.42(-0.53,+1.22), the high energy photon index beta = -2.26(2.26,+0.39), the peak energy Ep = 204(-82,+113) keV (chi2 = 57/55 dof). All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.