О. Бурхонов
A5021534163- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Planetary Science and Exploration
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Nuclear Physics and Applications
- Astrophysics and Star Formation Studies
- Space Satellite Systems and Control
- Cosmology and Gravitation Theories
- Relativity and Gravitational Theory
- Calibration and Measurement Techniques
- Statistical and numerical algorithms
- Musicology and Musical Analysis
- Advanced Research in Science and Engineering
- Space Exploration and Technology
- Solar and Space Plasma Dynamics
Ulugh Beg Astronomical Institute
2015-2024
National University of Uzbekistan
2008-2024
Academy of Sciences Republic of Uzbekistan
2005-2024
Samarkand State University named after Sharof Rashidov
2024
Astronomical Institute of the Slovak Academy of Sciences
2014
Isaac Newton Institute
2005
ABSTRACT GRANDMA (Global Rapid Advanced Network Devoted to the Multi-messenger Addicts) is a network of 25 telescopes different sizes, including both photometric and spectroscopic facilities. The aims coordinate follow-up observations gravitational-wave (GW) candidate alerts, especially those with large localization uncertainties, reduce delay between initial detection optical confirmation. In this paper, we detail GRANDMA’s observational performance during LIGO/Advanced Virgo Observing Run...
GRB 221009A is the brightest Gamma-Ray Burst (GRB) detected in more than 50 years of study. In this paper, we present observations X-ray and optical domains after obtained by GRANDMA Collaboration (which includes from 30 professional amateur telescopes) Insight-HXMT Collaboration. We study afterglow with empirical fitting GRANDMA+HXMT data, augmented data literature up to 60 days. then model numerically, using a Bayesian approach, HXMT-LE observations, that augment Swift-XRT additional...
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 the Global Rapid Advanced Network Devoted to Multi-messenger Addicts (GRANDMA). The network consists of 21 telescopes with both photometric and spectroscopic facilities. They are connected together thanks a dedicated infrastructure. aims at coordinating observations large sky position estimates transient events enhance their follow-up reduce delay between initial detection optical confirmation. GRANDMA program mainly focuses on gravitational-wave alerts find characterise...
Abstract On 2022 September 26, the Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, satellite of binary near-Earth asteroid (65803) Didymos. This demonstrated efficacy a kinetic impactor for planetary defense by changing orbital period Dimorphos 33 minutes. Measuring change relied heavily on coordinated campaign lightcurve photometry designed to detect mutual events (occultations and eclipses) as direct probe satellite’s period. A total 28 telescopes contributed 224...
Abstract The Stellar Abundances and Galactic Evolution Survey (SAGES) of the northern sky is a specifically designed multiband photometric survey aiming to provide reliable stellar parameters with accuracy comparable those from low-resolution optical spectra. It was carried out 2.3 m Bok telescope Steward Observatory three other telescopes. observations in u s v passband produced over 36,092 frames images total, covering area ∼9960 deg 2 . median completenesses all observing fields for two...
The spin state of small asteroids can change on a long timescale by the Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect, net torque that arises from anisotropically scattered sunlight and proper thermal radiation an irregularly-shaped asteroid. secular in rotation period caused YORP effect be detected analysis asteroid photometric lightcurves. We analyzed lightcurves near-Earth (1865) Cerberus, (2100) Ra-Shalom, (3103) Eger with aim to detect possible deviations constant effect. carried...
ABSTRACT GRB 230812B is a bright and relatively nearby (z = 0.36) long gamma-ray burst (GRB) that has generated significant interest in the community thus been observed over entire electromagnetic spectrum. We report 80 observations X-ray, ultraviolet, optical, infrared, submillimetre bands from GRANDMA (Global Rapid Advanced Network for Multimessenger Addicts) network of observatories observational partners. Adding complementary data literature, we then derive essential physical parameters...
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...
The discovery rate of near-Earth asteroids (NEAs) has steadily increased over the past three decades, yet physical characterization these objects not kept pace. In an effort to help address this gap, we combined targeted photometric observations, archival data, and sparse data from Asteroid Terrestrial-impact Last Alert System (ATLAS) survey extract as much information possible about NEAs' rotation rates, spin-axis orientations, shapes. We selected 17 NEAs with a potential for shape...
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...
We present new brightness monitoring observations of the 4 components gravitationally lensed system Q2237+0305, which show detection an intrinsic quasar fluctuation at a time subdued microlensing activity, between June 27 and October 12, 2003. These data were used to determine delays arrivals four images. The measured are , h, so they confirm that long history has produced significant microlensing. However error bars associated with delays, order 2 days, too large discriminate competing...
Main belt asteroids (6070) Rheinland and (54827) 2001 NQ8 belong to a small population of couples bodies that reside in very similar heliocentric orbits. Vokrouhlický & Nesvorný promoted the term "asteroid pairs," pointing out their common origin within past tens hundreds kyr. Previous attempts reconstruct initial configuration at time separation have led prediction Rheinland's rotation should be retrograde. Here, we report extensive photometric observations this asteroid use light curve...
The near-Earth asteroid 3200 Phaethon (1983 TB) is an attractive object not only from a scientific viewpoint but also because of JAXA's DESTINY+ target. rotational lightcurve and spin properties were investigated based on the data obtained in ground-based observation campaign Phaethon. We aim to refine lightcurves shape model using all available datasets via optical observation, as well our time-series 2017 apparition. Using eight 1-2-m telescopes imager, we acquired derived parameters...
We present our follow-up observations with GRANDMA of transient sources revealed by the Zwicky Transient Facility (ZTF). Over a period six months, all ZTF triggers were examined in real time dedicated science module implemented Fink broker, which will be used for data processing Vera C. Rubin Observatory. In this article, we three selection methods to identify kilonova candidates. Out more than 35 million candidates, hundred have passed criteria. Six then followed-up (by both professional...
Abstract The nuclear transient AT2019cuk/Tick Tock/SDSS J1430+2303 has been suggested to harbor a supermassive black hole (SMBH) binary near coalescence. We report results from high-cadence NICER X-ray monitoring with multiple visits per day 2022 January August, as well continued optical during the same time period. find no evidence of periodic/quasiperiodic modulation in X-ray, UV, or bands; however, we do observe exotic hard variability that is unusual for typical active galactic nuclei...
Aims.The time delays between the components of a lensed quasar are basic tools for analysing expansion Universe and structure main lens galaxy halo. In this paper, we focus on variability delay double system SBS 0909+532A,B as well behaviour field stars.
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...
We present the results of a monitoring campaign double quasar SBS 1520+530 at Maidanak observatory from April 2003 to August 2004. obtained light curves in V and R filters that show small-amplitude mag intrinsic variations on time scales about 100 days. The data set is consistent with previously determined delay days by Burud et al. (2002, A&A, 391, 481). find corrected magnitude difference between images now larger than during observations (2002). This confirms presence gravitational...