M. Jelínek
A5021922849- 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
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Atmospheric Ozone and Climate
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Solar and Space Plasma Dynamics
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Spectroscopy and Chemometric Analyses
- Astrophysics and Star Formation Studies
- Calibration and Measurement Techniques
- Particle Detector Development and Performance
- Microbial Metabolites in Food Biotechnology
- Methane Hydrates and Related Phenomena
- Dark Matter and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Spacecraft Design and Technology
- Particle Accelerators and Free-Electron Lasers
Czech Academy of Sciences, Astronomical Institute
2015-2024
Masaryk University
2003-2024
Instituto de Astrofísica de Andalucía
2013-2023
National Academy of Sciences of Ukraine
2023
University of Geneva
2023
Charles University
2003-2023
Czech Academy of Sciences, Institute of Physics
2023
Czech Academy of Sciences
2023
Institute of Astronomy
2009-2019
Institute of Applied Astronomy
2019
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...
ABSTRACT OJ 287 is a quasi-periodic quasar with roughly 12 year optical cycles. It displays prominent outbursts that are predictable in binary black hole model. The model predicted major outburst 2015 December. We found the did occur within expected time range, peaking on December 5 at magnitude 12.9 R -band. Based Swift /XRT satellite measurements and polarization data, we find it included thermal component. Its timing provides an accurate estimate for spin of primary hole, . present also...
ABSTRACT We present results from a multi-chord Pluto stellar occultation observed on 2015 June 29 New Zealand and Australia. This occurred only two weeks before the NASA Horizons flyby of system serves as useful comparison between ground-based space results. find that Pluto's atmosphere is still expanding, with significant pressure increase 5 ± 2% since 2013 factor almost three 1988. trend rules out, today, an atmospheric collapse associated recession Sun. A central flash, rare occurrence,...
Abstract Results from regular monitoring of relativistic compact binaries like PSR 1913+16 are consistent with the dominant (quadrupole) order emission gravitational waves (GWs). We show that observations associated binary black hole (BBH) central engine blazar OJ 287 demand inclusion radiation reaction effects beyond quadrupolar order. It turns out even certain hereditary contributions to GW required predict impact flare timings 287. develop an approach incorporates this effect into BBH...
Abstract This is the first in a collection of three papers introducing science with an ultra-violet (UV) space telescope on approximately 130 kg small satellite moderately fast re-pointing capability and real-time alert communication system approved for Czech national mission. The mission, called Quick Ultra-Violet Kilonova surveyor—QUVIK , will provide key follow-up capabilities to increase discovery potential gravitational wave observatories future wide-field multi-wavelength surveys....
Aims. Since the CGRO operation in 1991–2000, one of primary unresolved questions about blazar γ-ray emission has been its possible correlation with low-energy (in particular optical) emission. To help answer this problem, Whole Earth Blazar Telescope (WEBT) consortium organized GLAST-AGILE Support Program (GASP) to provide optical-to-radio monitoring data be compared detections by AGILE and GLAST satellites. This new WEBT project started early September 2007, just before a strong detection...
We study SN 2006oz, a newly-recognized member of the class H-poor, super-luminous supernovae. present multi-color light curves from SDSS-II Survey, that cover rise time, as well an optical spectrum shows explosion occurred at z~0.376. fitted black body functions to estimate temperature and radius evolution photosphere used parametrized code SYNOW model spectrum. constructed bolometric curve compared it with models. The very early show dip in g- r-bands possible initial cooling phase u-band...
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...
Abstract We report the study of a huge optical intraday flare on 2021 November 12 at 2 a.m. UT in blazar OJ 287. In binary black hole model, it is associated with an impact secondary accretion disk primary. Our multifrequency observing campaign was set up to search for such signature based prediction made 8 yr earlier. The first I -band results have already been reported by Kishore et al. (2024). Here we combine these data our monitoring R -band. There big change – spectral index 1.0 ± 0.1...
We present optical and near-infrared observations of the afterglow gamma-ray burst GRB 050904. derive a photometric redshift z = 6.3, estimated from presence Lyman break falling between I J filters. This is by far most distant known to date. Its isotropic-equivalent energy 3.4x10^53 erg in rest-frame 110-1100 keV band. Despite high redshift, both prompt emission are not peculiar with respect other GRBs. find J-band light curve at t_b 2.6 +- 1.0 d (observer frame). If we assume this jet...
The bright blazar OJ~287 routinely parades high brightness bremsstrahlung flares, which are explained as being a result of secondary supermassive black hole (SMBH) impacting the accretion disc more massive primary SMBH in binary system. is not rigid but rather bends calculable way due to tidal influence secondary. Below we refer this phenomenon variable level. We begin by showing that these flares occur at times predicted simple analytical formula, based on general relativity inspired...
We observed an optical afterglow of GRB200131A obtaining the first photometric point 63 s after satellite trigger. This early observation shows a steep decay, suggesting either internal engine activity or reverse shock. By fitting this data set, we show that fit well as shock component GRB modeled thin shell expanding into constant density interstellar matter. The also good agreement with catalogued Milky Way galactic extinction and leaves little room for further in host galaxy. judging...
The quasar 3C 279 was the target of an extensive multiwavelength monitoring campaign from 2006 January through April. An optical-IR-radio by Whole Earth Blazar Telescope (WEBT) collaboration organized around target-of-opportunity X-ray and soft γ-ray observations with Chandra INTEGRAL in mid-January, additional coverage RXTE Swift XRT. In this paper we focus on results WEBT campaign. source exhibited substantial variability optical flux spectral shape, a characteristic timescale few days....
<i>Context. <i/>BL Lacertae is the prototype of blazar subclass named after it. Yet, it has occasionally shown a peculiar behaviour that questioned simple interpretation its broad-band emission in terms synchrotron plus self-Compton (SSC) radiation.<i>Aims. <i/>In 2007–2008 observing season we carried out new multiwavelength campaign Whole Earth Blazar Telescope (WEBT) on BL Lacertae, involving three pointings by XMM-Newton satellite July and December 2007, January 2008, to study properties,...
We present results of the prompt, early, and afterglow optical observations five gamma-ray bursts, GRBs 100901A, 100902A, 100905A, 100906A, 101020A, made with Mobile Astronomical System TElescope-Robots in Russia (MASTER-II net), 1.5-m telescope Sierra-Nevada Observatory, 2.56-m Nordic Optical Telescope. For two sources, GRB 100901A we detected counterparts obtained light curves starting before cessation emission, at 113 s 48 after trigger, respectively. Observations 100906A were conducted...
We use a sample of 19 Gamma Ray Bursts (GRBs) that exhibit single-peaked optical light curves to test the standard fireball model by investigating relationship between time onset afterglow and temporal rising index. Our includes GRBs X-ray flashes for which we derive wide range initial Lorentz factors ($40 < \Gamma 450$). Using plausible parameters typical frequency forward shock is expected lie close band; within this low framework, data constrain $\epsilon_e$ show values derived from early...
Context. Pluto's tenuous nitrogen (N2) atmosphere undergoes strong seasonal effects due to high obliquity and orbital eccentricity, has been recently (July 2015) observed by the New Horizons spacecraft. Goals are (i) construct a well calibrated record of evolution surface pressure on Pluto (ii) constrain structure lower using central flash in 2015. Method: eleven stellar occultations between 2002 2016 used retrieve atmospheric profiles (density, pressure, temperature) $\sim$5 km $\sim$380...