The long-active afterglow of GRB 210204A: detection of the most delayed flares in a gamma-ray burst

Kumar, Harsh; Gupta, Rahul; Saraogi, Divita; Ahumada, Tomás; Andreoni, Igor; Anupama, G. C.; Aryan, Amar; Barway, Sudhanshu; Bhalerao, V.; Chandra, Poonam; Coughlin, M. W.; Dimple, Dimple; Dutta, Anirban; Ghosh, Ankur; Ho, Anna Y. Q.; Kool, E. C.; Kumar, Amit; Medford, Michael S.; Misra, Kuntal; Perley, D.; Riddle, Reed; Ror, Amit Kumar; Setiadi, Jason M.; Yao, Yuhan

doi:10.1093/mnras/stac1061

Cited by 8 publications

(6 citation statements)

References 72 publications

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“…Figure 6 shows the comparison of GRB afterglow detections followed up by GIT to the Swift GRB optical afterglow population (Kann et al 2011). We see that GIT has obtained dense sampling of several GRBs (see for instance Kumar et al 2022) and that the afterglow candidates studied by GIT show similar fading characteristics as the broader sample of Swift GRBs.…”

Section: Afterglows Of Gamma-ray Burstsmentioning

confidence: 93%

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India’s First Robotic Eye for Time-domain Astrophysics: The GROWTH-India Telescope

Kumar¹,

Bhalerao²,

Anupama³

et al. 2022

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We present the design and performance of the GROWTH-India telescope, a 0.7 m robotic telescope dedicated to time-domain astronomy. The telescope is equipped with a 4k back-illuminated camera that gives a 0.°82 field of view and a sensitivity of m g′ ∼ 20.5 in 5 minute exposures. Custom software handles observatory operations: attaining high on-sky observing efficiencies (≳80%) and allowing rapid response to targets of opportunity. The data processing pipelines are capable of performing point-spread function photometry as well as image subtraction for transient searches. We also present an overview of the GROWTH-India telescope’s contributions to the studies of gamma-ray bursts, the electromagnetic counterparts to gravitational wave sources, supernovae, novae, and solar system objects.

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Section: Afterglows Of Gamma-ray Burstsmentioning

confidence: 93%

“…Another interesting GRB 210204A which showed deviations from typical synchrotron-driven afterglow emission at late times was followed up by GIT in coordination with other Indian facilities like HCT, DOT, and DFOT. A detailed study of this GRB was published in Kumar et al (2022).…”

Section: Afterglows Of Gamma-ray Burstsmentioning

confidence: 99%

India’s First Robotic Eye for Time-domain Astrophysics: The GROWTH-India Telescope

Kumar¹,

Bhalerao²,

Anupama³

et al. 2022

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“…This makes flares a common feature in GRBs despite the difference in progenitors. The majority of flares happen before a few 1000 s (Chincarini et al 2007); however, a few flares are found to occur as late as 10 6 s (Swenson et al 2010;Kumar et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Statistical Analysis of Long GRBs’ Prompt Emission and X-Ray Flares: Multivariate Clustering and Correlations

Saji,

Iyyani,

Mazde

2023

ApJS

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The extensive observations done by the X-ray Telescope on board Neil Gehrels Swift Observatory have revealed the presence of late-time flares concurrent with the decaying afterglow emission. However, the origins of these flares are elusive. In this work, we make use of the large database of Swift observations (2005–2020) of long gamma-ray bursts (GRBs) to conduct a systematic statistical study between the prompt gamma-ray emission and X-ray flares by characterizing their temporal and spectral properties of duration, quiescent period, peak flux, fluence, minimum variability timescale, and spectral power-law index. The multidimensional database of parameters thereby generated was investigated by principal component analysis, which revealed there is no evident correlation between the different parameters of the prompt emission and X-ray flares. Furthermore, the correlation studies revealed that while there is a trend of positive correlation between the minimum variability timescale of the flare and its duration, and of strong negative correlation with its peak flux, there are no such correlations observed in the prompt emission. Similarly, we find a positive correlation between the quiescent period and the flare duration, and a negative correlation with the flare peak flux, while no such correlations are observed for the prompt emission of the GRBs. Finally, among the X-ray flares, we find two dominant classes, whose variations are driven by the minimum variability timescale, peak flux, and fluence of the flares. A catalog of these different parameters characterizing the prompt and flare emissions is presented.

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“…Deeper optical photometric follow-up observations of energetic transients, such as afterglows of long and short GRBs are frequently carried out (Dimple et al, 2020;Kumar et al, 2021aKumar et al, , 2022Gupta et al, 2021cGupta et al, , d, e, 2022 using the recently commissioned largest Indian optical telescope, i.e., 3.6m DOT situated at Devasthal observatory of Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital and the back-end instruments (Ojha et al 2018;Pandey et al 2018;Kumar et al 2021b). Observations of galaxies and other objects of low-surface brightness are also carried out using the 3.6m DOT (Kumar et al 2021b;Panwar et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Photometric studies on the host galaxies of gamma-ray bursts using 3.6m Devasthal optical telescope

et al. 2022

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In this paper, we present multi-band photometric observations and analysis of the host galaxies for a sample of five interesting gamma-ray bursts (GRBs) observed using the 3.6m Devasthal optical telescope (DOT) and the back-end instruments. The host galaxy observations of GRBs provide unique opportunities to estimate the stellar mass, ages, star-formation rates and other vital properties of the burst environments and hence, progenitors. We performed a detailed spectral energy distribution (SED) modeling of the five host galaxies using an advanced tool called Prospector, a stellar population synthesis model. Furthermore, we compared the results with a larger sample of well-studied host galaxies of GRBs, supernovae and normal star-forming galaxies. Our SED modeling suggests that GRB 130603B, GRB 140102A, GRB 190829A and GRB 200826A have massive host galaxies with high star-formation rates (SFRs). On the other hand, a supernovae-connected GRB 030329 has a rare low-mass galaxy with a low star-formation rate. We also find that GRB 190829A has the highest (in our sample) amount of visual dust extinction and gas in its local environment of the host, suggesting that the observed very high-energy emission from this burst might have a unique local environment. Broadly, the five GRBs in our sample satisfy the typical correlations between host galaxies parameters and these physical parameters are more common to normal star-forming galaxies at the high-redshift Universe. Our results also demonstrate the capabilities of 3.6m DOT and the back-end instruments for the deeper photometric studies of the host galaxies of energetic transients, such as GRBs, supernovae and other transients in the long run.Keyword. Gamma-ray burst: general-galaxies: dwarf-methods: data analysis-techniques: photometric.

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The long-active afterglow of GRB 210204A: detection of the most delayed flares in a gamma-ray burst

Cited by 8 publications

References 72 publications

India’s First Robotic Eye for Time-domain Astrophysics: The GROWTH-India Telescope

India’s First Robotic Eye for Time-domain Astrophysics: The GROWTH-India Telescope

Statistical Analysis of Long GRBs’ Prompt Emission and X-Ray Flares: Multivariate Clustering and Correlations

Photometric studies on the host galaxies of gamma-ray bursts using 3.6m Devasthal optical telescope

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