V. Rumyantsev
A5006969434- Gamma-ray bursts and supernovae
- SAS software applications and methods
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Space Satellite Systems and Control
- Isotope Analysis in Ecology
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Calibration and Measurement Techniques
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Nuclear Physics and Applications
- CCD and CMOS Imaging Sensors
- GNSS positioning and interference
- Laser-induced spectroscopy and plasma
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Algebraic Geometry and Number Theory
- Advanced Topics in Algebra
- Spectroscopy and Chemometric Analyses
- Optical Systems and Laser Technology
Special Astrophysical Observatory
2007-2023
Crimean Astrophysical Observatory
2008-2021
Taras Shevchenko National University of Kyiv
2014
Space Research Institute
2013
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...
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 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...
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...
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 report the detection of a faint optical flash by 2-m Faulkes Telescope North simultaneously with second two prompt gamma-ray pulses in INTEGRAL burst (GRB) 080603A, beginning at t_rest = 37 s after onset GRB. This appears to be distinct from subsequent emerging afterglow emission, for which we present comprehensive broadband radio X-ray light curves 13 days post-burst and rigorously test standard fireball model. The intrinsic extinction toward GRB 080603A is high (A_V,z 0.8 mag),...
Gamma-ray bursts (GRBs) are the most luminous explosions in Universe, yet nature and physical properties of their energy sources far from understood. Very important clues, however, can be inferred by studying afterglows these events. We present optical X-ray observations GRB 130831A obtained Swift, Chandra, Skynet, Reionization And Transients Infra-Red camera, Maidanak, International Scientific Optical-Observation Network, Nordic Optical Telescope, Liverpool Telescope Gran Telescopio...
Aims: With this paper we want to investigate the highly variable afterglow light curve and environment of gamma-ray burst (GRB) 060526 at $z=3.221$. Methods: We present one largest photometric datasets ever obtained for a GRB afterglow, consisting multi-color data from ultraviolet near infrared. The set contains 412 points in total which add additional literature. Furthermore, low-resolution high signal-to-noise spectra afterglow. is modeled with both an analytical model using broken power...
The ejecta composition is an open question in gamma-ray bursts (GRB) physics. Some GRBs possess a quasi-thermal spectral component the time-resolved analysis, suggesting hot fireball origin. Others show featureless non-thermal spectrum known as "Band" function, consistent with synchrotron radiation origin and that jet Poynting-flux-dominated at central engine likely emission region well. There are also showing sub-dominant thermal dominant hybrid composition. Here we report extraordinarily...
We present observations of the dark gamma-ray burst GRB 051008 provided by Swift/BAT, Swift/XRT, Konus-WIND, INTEGRAL/SPI-ACS in high-energy domain and Shajn, Swift/UVOT, Tautenburg, NOT, Gemini Keck I telescopes optical near-infrared bands. The was detected only gamma- X-rays neither a prompt nor radio afterglow down to deep limits. identified host galaxy burst, which is typical Lyman-break (LBG) with R-magnitude 24.06 ± 0.10 mag. A redshift |$z = 2.77_{-0.20}^{+0.15}$| measured...
The rotation state of small asteroids is affected by the Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect, which a net torque caused solar radiation directly reflected and thermally reemitted from surface. Due to this period slowly changes, can be most easily measured in light curves because shift phase accumulates over time quadratically. We collected archived carried out new photometric observations for (10115) 1992 SK, (1620) Geographos, (1685) Toro. applied method curve inversion fit...
Events such as GRB130606A at z=5.91, offer an exciting new window into pre-galactic metal enrichment in these very high redshift host galaxies. We study the environment and galaxy of GRB 130606A, a high-z event, context population GRBs. have obtained multiwavelength observations from radio to gamma-ray, concentrating particularly on X-ray evolution well optical photometric spectroscopic data analysis. With initial Lorentz bulk factor range Γ_0 ~ 65-220, afterglow can be explained by...
The Swift Gamma-Ray Burst Explorer performed its first autonomous, X-ray follow-up to a newly detected GRB on 2005 January 17, within 193 seconds of the burst trigger by Alert Telescope. While was still in progress, Telescope obtained position and an image for un-catalogued source; simultaneous with gamma-ray observation. XRT observed flux during prompt emission 1.1 x 10^{-8} ergs cm^{-2} s^{-1} 0.5-10 keV energy band. band decreased three orders magnitude 700 seconds, following emission....
Aims. We studied the rotational properties of dwarf planet Makemake. Methods. The photometric observations were carried out at different telescopes between 2006 and 2017. Most measurements acquired in BVRI broad-band filters a standard Johnson-Cousins system. Results. found that Makemake rotates more slowly than was previously reported. A possible lightcurve asymmetry suggests double-peaked period P = 22.8266 ± 0.0001 h. small peak-to-peak amplitude R -filter 0.032 0.005 mag implies an...
<i>Context. <i/>The detection of bright optical emission measured with good temporal resolution during the prompt phase GRB 060111Bmakes this a rare event that is especially useful for constraining theories emission. <i>Aims. <i/>For reason an extended multi-wavelength campaign was performed to further constrain physical interpretation observations. <i>Methods. <i/>In work, we present results obtained from our campaign, as well public Swift/BAT, XRT, and UVOT data.<i>Results. <i/>We...