Observation of cosmic gamma-ray bursts and solar flares in the ''RELEC'' experiment on the ''VERNOV'' satellite

Gamma-Ray Bursts (GRBs) The time profile of GRB A in gamma and optical ranges recorded by INTEGRAL The time profile of GRB A in gamma and optical ranges recorded by INTEGRAL. The location on the celestial sphere of 2074 gamma-ray sources detected by BATSE. GRB energy release is erg. GRB energy release is erg. Energy range: hard X-rays and gamma-rays. Energy range: hard X-rays and gamma-rays. Types: short (T 90 2с). Types: short (T 90 2с).

The ''VERNOV'' satellite was launched on the 8 July Data are available from to The orbital parameters: Apogee – 819 km Apogee – 819 km Perigee – 621 km Perigee – 621 km Inclination – 98,4° Inclination – 98,4° Orbital period – 99,2 min Orbital period – 99,2 min

The main scientific objectives of ''RELEC'' are: observation of transient phenomena in the atmosphere observation of transient phenomena in the atmosphere study of processes of magnetospheric electrons acceleration and precipitations study of processes of magnetospheric electrons acceleration and precipitations observation of GRBs and solar flares observation of GRBs and solar flares An additional objective is: 1.DRGE-1,2 - X-ray and gamma-ray spectrometers, 2.DRGE axis detector for electrons, 3.DUV - detector of ultraviolet and red radiation, 4.Telescope-T - fast optical imager, 5.NChA, RFA - low-frequency and radio-frequency analyzers of electromagnetic field and waves, 6. BE – data and control unit. Instruments:

DRGE-1 и DRGE-2 Two identical spectrometers for X-rays and gamma-rays, each containing of two independent scintillator phosvich-detectors. Two identical spectrometers for X-rays and gamma-rays, each containing of two independent scintillator phosvich-detectors. Total effective area: Total effective area: 500 cm 2 (for 100 keV). 500 cm 2 (for 100 keV). Energy range: Energy range: keV keV. Time resolution: 15 mcs in event mode. Time resolution: 15 mcs in event mode. input window cover PMT 130

DRGE-3 A spectrometer of charged particles containing of 3 orthogonally directed scintillator detectors. A spectrometer of charged particles containing of 3 orthogonally directed scintillator detectors. Energy range: Energy range: 0, MeV (for electrons). 0, MeV (for electrons). Sensitive area of each detector ~3 cm 2. Sensitive area of each detector ~3 cm 2.

Statistics of GCN notices in period of ''Vernov'' data ( ) All notices 288 All events 248 Impossible to analyze (no data, radiation belts, etc) 144 High background 49 Events with auspicious conditions of observation 55 Events registered by RELEC 6 (~11%)

Table of registered events. DateTime Missions which also registered these events :59: :59:33.48KonusFermi :49:04.72Konus :46: :46:20.36KonusFermi :01: :01:37.66KonusINTEGRAL :49:12.21Konus :03:19.51Konus 1,3,6 - GRBs, 2,4 – solar flares, 5 – GRB candidate.

GRBs DRGE DRGE-3 Seconds from Counts per 2ms Time, hh:mm:ss DRGE 1-1 DRGE 1-2 DRGE 2-2 Sum

GRB candidate DRGE-3 Time, hh:mm:ss

Solar flare

Time profile Time, hh:mm:ss N(>E), 1/sec

Integral spectra of energy release N(>E), 1/sec

Solar flare Time from 13:00:00 Count rate, 1/sec DRGE-11, NaI DRGE-22, NaI

Solar flares (green lines) and (blue lines). Count rate, 1/sec Seconds from 13:00:00 for flare at and from 17:47:30 for flare at

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