A. Volnova
A5089774164- Gamma-ray bursts and supernovae
- SAS software applications and methods
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Astro and Planetary Science
- Anomaly Detection Techniques and Applications
- Spectroscopy and Chemometric Analyses
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Adaptive optics and wavefront sensing
- Calibration and Measurement Techniques
- Optical Systems and Laser Technology
- Particle Accelerators and Free-Electron Lasers
- Influenza Virus Research Studies
- Computational Physics and Python Applications
- Time Series Analysis and Forecasting
- Methane Hydrates and Related Phenomena
- Nuclear Physics and Applications
- Advanced Data Processing Techniques
- Data-Driven Disease Surveillance
- Scientific Computing and Data Management
Space Research Institute
2016-2025
Russian Academy of Sciences
2024
Lomonosov Moscow State University
2009-2020
National Research University Higher School of Economics
2019
Université Clermont Auvergne
2019
Centre National de la Recherche Scientifique
2019
Central Aerohydrodynamic Institute
2019
Moscow Institute of Physics and Technology
2019
Astronomical Institute of the Slovak Academy of Sciences
2008
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...
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...
ABSTRACT We present results from applying the SNAD anomaly detection pipeline to third public data release of Zwicky Transient Facility (ZTF DR3). The is composed three stages: feature extraction, search outliers with machine learning algorithms, and identification followup by human experts. Our analysis concentrates in ZTF fields, comprising more than 2.25 million objects. A set four automatic algorithms was used identify 277 outliers, which were subsequently scrutinized an expert. From...
We present Rainbow, a physically motivated framework which enables simultaneous multi-band light curve fitting. It allows the user to construct 2-dimensional continuous surface across wavelength and time, even in situations where number of observations each filter is significantly limited. Assuming electromagnetic radiation emission from transient can be approximated by black-body, we combined an expected temperature evolution parametric function describing its bolometric curve. These three...
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 the first evidence that adaptive learning techniques can boost discovery of unusual objects within astronomical light curve data sets. Our method follows an active strategy where algorithm chooses which potentially improve learner if additional information about them is provided. This new subsequently used to update machine model, allowing its accuracy evolve with each information. For case anomaly detection, aims maximize number scientifically interesting anomalies presented...
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...
In the upcoming decade large astronomical surveys will discover millions of transients raising unprecedented data challenges in process. Only use machine learning algorithms can process such volumes. Most discovered belong to known classes objects. However, it is expected that some be rare or completely new events unknown physical nature. The task finding them framed as an anomaly detection problem. this work, we perform for first time automated analysis photometric Open Supernova Catalog...
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 We describe the SNAD Viewer , a web portal for astronomers which presents centralized view of individual objects from Zwicky Transient Facility’s (ZTF) data releases, including gathered multiple publicly available astronomical archives and sources. Initially built to enable efficient expert feedback in context adaptive machine learning applications, it has evolved into full-fledged community asset that centralizes public information provides multi-dimensional ZTF For users, we...
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...
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...
Abstract We investigate the prompt emission and afterglow properties of short-duration gamma-ray burst (sGRB) 130603B another eight sGRB events during 2012–2015, observed by several multiwavelength facilities including Gran Canarias Telescope 10.4 m telescope. Prompt high energy data were obtained INTEGRAL-SPI-ACS, Swift-BAT, Fermi-GBM satellites. The INTEGRAL in range 0.1–10 MeV for 130603B, 140606A, 140930B, 141212A, 151228A do not show any signature extended or precursor activity their...
ABSTRACT Most of the stars in Universe are M spectral class dwarfs, which known to be source bright and frequent stellar flares. In this paper, we propose new approaches discover M-dwarf flares ground-based photometric surveys. We employ two approaches: a modification traditional method parametric fit search machine learning algorithm based on active anomaly detection. The algorithms applied Zwicky Transient Facility (ZTF) data release 8, includes from ZTF high-cadence survey, allowing us...
Aims. To derive observational properties and physical parameters of the progenitor stars type IIP supernovae SN 2005ay 2005cs from their CCD photometry, to define velocity behaviour.
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...