TITLE: GCN CIRCULAR NUMBER: 38398 SUBJECT: Konus-Wind detection of GRB 241114B DATE: 24/11/30 21:32:42 GMT FROM: Dmitry Svinkin at Ioffe Institute svinkin@mail.ioffe.ru

V. Panteleeva, D. Frederiks, A. Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report:

The long-duration GRB 241114B (Insight-HXMT-HE detection: Wang et al., GCN 38284; IPN triangulation: Svinkin et al., GCN 38341) triggered Konus-Wind at T0=39903.659 s UT (11:05:03.659).

The burst light curve shows a multipeaked structure which starts at ~T0-11.7 s and has a total duration of ~45 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/GRB241114_T39903/

As observed by Konus-Wind, the burst had a fluence of 4.03(-0.38,+0.43)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+23.648 s, of 1.38(-0.22,+0.24)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range).

The time-averaged spectrum of the burst (measured from T0 to T0+32.768 s) is best fit in the 20 keV - 16 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -1.15(-0.10,+0.11), the high energy photon index beta = -3.11(-6.89,+0.49), the peak energy Ep = 258(-25,+30) keV (chi2 = 123/97 dof).

The spectrum near the maximum count rate (measured from T0+16.640 s to T0+24.576 s) is best fit in the 20 keV - 16 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.76(-0.14,+0.17), the high energy photon index beta = -3.08(-6.92,+0.46), the peak energy Ep = 272(-30,+31) keV (chi2 = 84/77 dof).

All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.

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