A. Pozanenko
A5059863753- Gamma-ray bursts and supernovae
- SAS software applications and methods
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Statistical and numerical algorithms
- Nuclear Physics and Applications
- Particle Detector Development and Performance
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Spectroscopy and Chemometric Analyses
- Planetary Science and Exploration
- Calibration and Measurement Techniques
- Advanced X-ray and CT Imaging
- Geomagnetism and Paleomagnetism Studies
- Particle Accelerators and Free-Electron Lasers
- Medical Imaging Techniques and Applications
- Methane Hydrates and Related Phenomena
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Earthquake Detection and Analysis
Space Research Institute
2016-2025
National Research University Higher School of Economics
2018-2025
Moscow Institute of Physics and Technology
2016-2025
Russian Academy of Sciences
2008-2024
Moscow Power Engineering Institute
2024
Moscow Aviation Institute
2024
Moscow Engineering Physics Institute
2015-2020
Space Research Institute
2017-2018
Institute of Applied Astronomy
2011
Institute for Nuclear Research
2011
We have gathered optical photometry data from the literature on a large sample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up to September 2009, for total 76 GRBs, and present an additional three pre-Swift not included in earlier sample. Furthermore, we publish 840 new points 42 GRB afterglows, sets 050319, 050408, 050802, 050820A, 050922C, 060418, 080413A 080810. analyzed light curves all derived spectral energy distributions with best quality, allowing us estimate host...
We present multiwavelength observations of the afterglow GRB 130427A, brightest (in total fluence) gamma-ray burst (GRB) past 29 yr. Optical spectroscopy from Gemini-North reveals redshift to be z = 0.340, indicating that its unprecedented brightness is primarily result relatively close proximity Earth; intrinsic luminosities both and are not extreme in comparison other bright GRBs. a large suite spanning 300 s 130 days after demonstrate shows simple, smooth evolution at all frequencies,...
Abstract Gamma-ray bursts (GRBs) are classified into long and short events. Long GRBs (LGRBs) associated with the end states of very massive stars, while (SGRBs) linked to merger compact objects. GRB 200826A was a peculiar event, because by definition it an SGRB, rest-frame duration ∼0.5 s. However, this event energetic soft, which is consistent LGRBs. The relatively low redshift ( z = 0.7486) motivated comprehensive, multiwavelength follow-up campaign characterize its host, search for...
This paper describes outstanding issues in astrophysics and cosmology that can be solved by astronomical observations a broad spectral range from far infrared to millimeter wavelengths.The discussed problems related the formation of stars planets, galaxies interstellar medium, studies black holes development cosmological model addressed planned space observatory Millimetron (the "Spectr-M" project) equipped with cooled 10-m mirror.Millimetron operate both as single-dish telescope part...
We present the most extensive sample of 45 type I (short) and 275 II (long) gamma-ray bursts (GRB) with known redshift to investigate correlation between rest frame peak energy, Ep,i total isotropic equivalent Eiso prompt emission (Amati relation). The - for is found be well-distinguished from one constructed has a similar power-law index value, = 0.4, which possibly indicates same mechanism both GRB types. show that initial pulse complex (IPC) an extended regular follow correlation. obtain...
The optical afterglow spectrum of GRB050401 (at z=2.8992+/-0.0004) shows the presence a DLA, with log(nHI)=22.6+/-0.3. This is highest column density ever observed in and about five times larger than strongest DLA detected so far any QSO spectrum. From spectrum, we also find very large Zn density, allowing us to infer an abundance [Zn/H]=-1.0+/-0.4. These columns are supported by X-ray from Swift-XRT which (in excess Galactic) log(nH)=22.21^{+0.06}_{-0.08} assuming solar abundances z=2.9)....
We present optical and near-infrared (NIR) photometry for three gamma-ray burst supernovae (GRB-SNe): GRB 120729A, 130215A / SN 2013ez 130831A 2013fu. In the case of 2013ez, we also spectroscopy at t-t0=16.1 d, which covers rest-frame 3000-6250 Angstroms. Based on Fe II (5169) Si (II) (6355), our spectrum indicates an unusually low expansion velocity 4000-6350 km/s, lowest ever measured a GRB-SN. Additionally, determined brightness shape each accompanying relative to template supernova (SN...
We present our observations of electromagnetic transients associated with GW170817/GRB 170817A using optical telescopes Chilescope observatory and Big Scanning Antenna (BSA) Pushchino Radio Astronomy Observatory at 110MHz. The detected an transient $\sim19^m$ on the third day in outskirts galaxy NGC 4993; we continued following its rapid decrease. put upper limit $1.5\times10^{4}$ Jy any radio source a duration 10-60 s which may be 170817A. prompt gamma-ray emission consists two distinctive...
We present a detailed study of the prompt and afterglow emission from Swift GRB 061126 using BAT, XRT, UVOT data multi-color optical imaging ten ground-based telescopes. was long burst (T_90=191 s) with four overlapping peaks in its gamma-ray light curve. The X-ray afterglow, observed 26 min to 20 days after burst, shows simple power-law decay alpha_X=1.290 \pm 0.008. Optical observations presented here cover time range 258 s (Faulkes Telescope North) 15 (Gemini burst; rate steep-to-shallow...
The existence of extended emission (EE) is an intriguing property short-duration gamma-ray bursts, because the nature EE still unclear. It might be a rising X-ray afterglow, or it could manifestation prolonged activity central engine. We consider emphasizing common properties both short bursts and with EE. Assuming that broad dynamic range we propose two jet model which can describe main episode hard spectra emission, specific for softer by different off axis position observer. involves jet,...
We present ground-based and HST optical observations of the transients (OTs) long-duration Gamma Ray Bursts (GRBs) 060729 090618, both at a redshift z = 0.54. For GRB 060729, bumps are seen in light curves (LCs), late-time broadband spectral energy distributions (SEDs) OT resemble those local type Ic supernovae (SNe). dense sampling our has allowed us to detect well-defined LCs, as well change colour, that indicative coming from core-collapse SN. The accompanying SNe for events individually...
ABSTRACT We present the largest optical photometry compilation of gamma-ray bursts (GRBs) with redshifts (z). include 64813 observations 535 events (including upper limits) from 28 February 1997 to 18 August 2023. also a user-friendly web tool grbLC which allows users visualize photometry, coordinates, redshift, host galaxy extinction, and spectral indices for each event in our database. Furthermore, we have added Gamma-ray Coordinate Network (GCN) scraper that can be used collect data by...
Abstract Since August 2014, a monitoring survey at frequency of 111 MHz has been conducted on the Large Phased Array (LPA) radio telescope P.N. Lebedev Physical Institute (LPI). We report discovery bright pulse having dispersion measure ( DM ) equal to 134.4 ± 2 pc cm –3 , peak flux density Sp 20 4 Jy and half-width 211 6 ms. The excessive pulse, after taking into account MilkyWay contribution, is 114 that indicates its extragalactic origin. Such value corresponds luminosity distance 713...
We present optical observations of SN 2013dx, related to the Fermi burst GRB 130702A occurred at a redshift z = 0.145. It is second-best sampled GRB-SN after SN~1998bw: observational light curves contain more than 280 data points in uBgrRiz filters until 88 day burst, and were collected from our collaboration (Maidanak Observatory, Abastumani Crimean Astrophysical Mondy National Observatory Turkey, Observatorio del Roque de los Muchachos) literature. model numerically multicolour using...
Abstract Multi-pulsed GRB 190530A, detected by the GBM and LAT onboard Fermi, is sixth most fluent burst so far. This paper presents timing, spectral, polarimetric analysis of prompt emission observed using AstroSat Fermi to provide insight into radiation mechanisms. The time-integrated spectrum shows conclusive proof two breaks due peak energy a second lower break. Time-integrated (55.43 ± 21.30 %) as well time-resolved polarization measurements, made Cadmium Zinc Telluride Imager (CZTI)...
We present comprehensive photometric R-band observations of the fading optical afterglow X-Ray Flash XRF050824, from 11 minutes to 104 days after burst. The lightcurve resembles lightcurves long duration Gamma-Ray Bursts (GRBs), i.e., a power-law albeit with rather shallow slope alpha=0.6. Our late images reveal host galaxy rest-frame B-band luminosity corresponding roughly 0.5 Lstar. star-formation rate as determined [O II] emission line is about 1.8 Msun per year. When accounting for...
We present a comprehensive analysis of bright, long duration (T90 ~ 257 s) GRB 110205A at redshift z= 2.22. The optical prompt emission was detected by Swift/UVOT, ROTSE-IIIb and BOOTES telescopes when the still radiating in gamma-ray band. Nearly 200 s observations were obtained simultaneously from optical, X-ray to gamma-ray, which makes it one exceptional cases study broadband spectral energy distribution across 6 orders magnitude during phase. By fitting time resolved spectra, we clearly...