Exceptionally bright optical emission from a rare and distant $γ-$ray burst

Oganesyan, G.; Karpov, S. N.; Jelínek, M.; Beskin, G. M.; Ronchini, S.; Banerjee, B.; Branchesi, M.; Štrobl, J.; Polasek, C.; Hudec, R.; Ivanov, Eugeny; Katkova, E.; Perkov, Alexey; Biryukov, A. V.; Lyapshina, Nadezhda; Sasyuk, V.; Mašek, M.; Janeček, Petr; Ebr, Jan; Jurýšek, Jakub; Cunniffe, R.; Prouza, M.

doi:10.48550/arxiv.2109.00010

Cited by 7 publications

(13 citation statements)

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“…We noticed that these values are well in agreement with the observed values (𝛼 𝑥 = 0.95 ± 0.01 and 𝛼 𝑜 = 0.61 ± 0.04). However Oganesyan et al (2021) considered similar values (without host galaxy reddening correction) of optical/X-ray spectral indices (𝛽 𝑥 =𝛽 𝑜 =0.9) and claimed that at least before the jet break phase the observed 𝜈 𝑐 is above the X-ray band, which is inconsistent with our findings and are ruled out by our SED fitting (see § 4.2.2). Additionally we also implemented the "closure relations" post jet break phase and noticed that 𝜈 𝑐 follows the typical evolution predicted post jet break phase (i.e.…”

Section: Closure Relations and Cooling Break Frequencycontrasting

confidence: 80%

“…The broadband afterglow behaviour of GRBs could be understood either indirectly through empirical fitting constraining the temporal and spectral indices (closure relationship) or directly through external shock fireball modelling. Here, we have explored the empirical fitting method to understand the nature of the late-time broadband afterglow emission of GRB 210619B and have compared it with the afterglow results reported by Oganesyan et al (2021).…”

Section: Broadband Afterglowmentioning

confidence: 99%

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Multi-wavelength study of the luminous GRB 210619B observed with Fermi and ASIM

Caballero‐García¹,

Gupta²,

Pandey³

et al. 2022

Preprint

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We report detailed prompt emission observations and analysis of the very bright and long GRB 210619B, detected by the Atmosphere-Space Interactions Monitor (ASIM) installed on the International Space Station (ISS) and the Gamma-ray Burst Monitor (GBM) on-board the Fermi mission. Our main goal is to understand the radiation mechanisms and jet composition of GRB 210619B. With a measured redshift of 𝑧 = 1.937 we find that GRB 210619B falls within the 10 most luminous bursts observed by Fermi so far. The energy-resolved prompt emission light curve of GRB 210619B exhibits an extremely bright hard emission pulse followed by softer/longer emission pulses. The low-energy photon indices (𝛼 pt ) values obtained using the time-resolved spectral analysis of the burst reveal a transition between the thermal (during harder pulse) to non-thermal (during softer pulse) outflow. We examine the correlation between spectral parameters and find that both peak energy and 𝛼 pt exhibit the flux tracking pattern. The late time broadband photometric dataset can be explained within the framework of the external forward shock model with 𝜈 𝑚 < 𝜈 𝑐 < 𝜈 𝑥 (where 𝜈 𝑚 , 𝜈 𝑐 , and 𝜈 𝑥 are the synchrotron peak, cooling-break, and X-ray frequencies, respectively) spectral regime supporting a rarely observed hard electron energy index (𝑝 < 2). We find moderate values of host extinction of E(B-V) = 0.14 ± 0.01 for the Small Magellanic Cloud (SMC) extinction law. In addition, we also report late-time optical observations with the 10.4 m GTC placing deep upper limits for the host galaxy (located at 𝑧=1.937), favouring a faint, dwarf host for the burst.

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Section: Closure Relations and Cooling Break Frequencycontrasting

confidence: 80%

Section: Broadband Afterglowmentioning

confidence: 99%

Multi-wavelength study of the luminous GRB 210619B observed with Fermi and ASIM

Caballero‐García¹,

Gupta²,

Pandey³

et al. 2022

Preprint

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“…Atteia (2021) noted the probability of a lensed visible afterglow in the following months due to this intervening system. Oganesyan et al (2021) combined multifilter optical observations together with X-ray and γ-ray data to model the emission of the GRB. They disentangled the contributions of the reverse and forward shocks and argued that the GRB multiwavelength emission is produced by a narrow, highly magnetized jet propagating in a sparse environment, with an approximate jet-break time at ∼10 4 s. A comparison between the optical and X-ray data shows evidence of a secondary component of radiation in the jet wings.…”

Section: Introductionmentioning

confidence: 99%

GRB 210619B optical afterglow polarization

Mandarakas

Blinov

Aguilera-Dena

et al. 2023

A&A

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Aims. We report on the follow-up of the extremely bright long gamma-ray burst (GRB) GRB 210619B with optical polarimetry. Methods. We conducted optopolarimetric observations of the optical afterglow of GRB 210619B in the SDSS-r band in the time window ∼5967 − 8245 s after the burst, using the RoboPol instrument at the Skinakas observatory. Results. We report a 5σ detection of polarization P = 1.5 ± 0.3 at polarization angle EVPA = 8 ± 6°. We find that during our observations, the polarization is likely constant. These values have been corrected for polarization induced by the interstellar medium of the Milky Way and host-induced polarization is likely negligible. Thus the polarization we quote is intrinsic to the GRB afterglow.

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“…Observations were carried out synchronously in four channels with the temporal resolutions of 1, 5, 10 and 30 s in the B,V bands and in white light. The scientific details on this discovery are presented in our special study [29].…”

Section: Resultsmentioning

confidence: 97%

EXPLANATION: Exoplanet and Transient Event Investigation Project—Optical Facilities and Solutions

et al. 2022

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Over the past decades, the achievements in astronomical instrumentation have given rise to a number of novel advanced studies related to the analysis of large arrays of observational data. One of the most famous of these studies is a study of transient events in the near and far space and a search for exoplanets. The main requirements for such kinds of projects are a simultaneous coverage of the largest possible field of view with the highest possible detection limits and temporal resolution. In this study, we present a similar project aimed at creating an extensive, continuously updated survey of transient events and exoplanets. To date, the core of the project incorporates several 0.07–2.5 m optical telescopes and the 6-m BTA telescope of the Special Astrophysical Observatory of RAS (Russia), a number of other Russian observatories and the Bonhyunsan observatory of the Korea Astronomy and Space Science Institute (South Korea). Our attention is mainly focused on the description of two groups of small, wide-angle optical telescopes for primary detection. All the telescopes are originally designed for the goals of the project and may be of interest to the scientific community. A description is also given for a new, high-precision optical spectrograph for the Doppler studies of transient and exoplanet events detected within the project. We present here the philosophy, expectations and first results obtained during the first year of running the project.

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Exceptionally bright optical emission from a rare and distant $γ-$ray burst

Cited by 7 publications

References 0 publications

Multi-wavelength study of the luminous GRB 210619B observed with Fermi and ASIM

Multi-wavelength study of the luminous GRB 210619B observed with Fermi and ASIM

GRB 210619B optical afterglow polarization

EXPLANATION: Exoplanet and Transient Event Investigation Project—Optical Facilities and Solutions

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