Probing into emission mechanisms of GRB 190530A using time-resolved spectra and polarization studies: Synchrotron Origin?

Multi-pulsed GRB 190530A, detected by the GBM and LAT onboard \fermi, is the sixth most fluent GBM burst detected so far. This paper presents the timing, spectral, and polarimetric analysis of the prompt emission observed using \AstroSat and \fermi to provide insight into the prompt emission radiati...

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Published in:arXiv.org 2022-01
Main Authors: Gupta, Rahul, Gupta, S, Chattopadhyay, T, Lipunov, V, Castro-Tirado, A J, Bhattacharya, D, Pandey, S B, Oates, S R, Kumar, Amit, Y -D Hu, Valeev, A F, P Yu Minaev, Kumar, H, Vinko, J, Dimple, Sharma, V, Aryan, A, Castellón, A, Gabovich, A, Moskvitin, A, Ordasi, A, Pál, A, Pozanenko, A, B -B Zhang, Kumar, B, Svinkin, D, Saraogi, D, Vlasenko, D, Fernández-García, E, Gorbovskoy, E, Anupama, G C, Misra, K, Sárneczky, K, Kriskovics, L, Castro-Tirado, M Á, Caballero-García, M D, Tiurina, N, Balanutsa, P, Lopez, R R, Sánchez-Ramírez, R, Szakáts, R, Belkin, S, Guziy, S, Iyyani, S, Tiwari, S N, Vadawale, Santosh V, Sun, T, Bhalerao, V, Kornilov, V, Sokolov, V V
Format: Article
Language:English
Subjects:
Broadband
Cadmium zinc tellurides
Emission analysis
Gamma rays
Kinetic energy
Polarization
Red shift
Spectra
Synchrotrons
Telescopes
Time measurement
Zinc telluride
Zinc tellurides
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creator Gupta, Rahul
Gupta, S
Chattopadhyay, T
Lipunov, V
Castro-Tirado, A J
Bhattacharya, D
Pandey, S B
Oates, S R
Kumar, Amit
Y -D Hu
Valeev, A F
P Yu Minaev
Kumar, H
Vinko, J
Dimple
Sharma, V
Aryan, A
Castellón, A
Gabovich, A
Moskvitin, A
Ordasi, A
Pál, A
Pozanenko, A
B -B Zhang
Kumar, B
Svinkin, D
Saraogi, D
Vlasenko, D
Fernández-García, E
Gorbovskoy, E
Anupama, G C
Misra, K
Sárneczky, K
Kriskovics, L
Castro-Tirado, M Á
Caballero-García, M D
Tiurina, N
Balanutsa, P
Lopez, R R
Sánchez-Ramírez, R
Szakáts, R
Belkin, S
Guziy, S
Iyyani, S
Tiwari, S N
Vadawale, Santosh V
Sun, T
Bhalerao, V
Kornilov, V
Sokolov, V V
description Multi-pulsed GRB 190530A, detected by the GBM and LAT onboard \fermi, is the sixth most fluent GBM burst detected so far. This paper presents the timing, spectral, and polarimetric analysis of the prompt emission observed using \AstroSat and \fermi to provide insight into the prompt emission radiation mechanisms. The time-integrated spectrum shows conclusive proof of two breaks due to peak energy and a second lower energy break. Time-integrated (55.43 \(\pm\) 21.30 \%) as well as time-resolved polarization measurements, made by the Cadmium Zinc Telluride Imager (CZTI) onboard \AstroSat, show a hint of high degree of polarization. The presence of a hint of high degree of polarization and the values of low energy spectral index (\(\alpha_{\rm pt}\)) do not run over the synchrotron limit for the first two pulses, supporting the synchrotron origin in an ordered magnetic field. However, during the third pulse, \(\alpha_{\rm pt}\) exceeds the synchrotron line of death in few bins, and a thermal signature along with the synchrotron component in the time-resolved spectra is observed. Furthermore, we also report the earliest optical observations constraining afterglow polarization using the MASTER (P \(
doi_str_mv 10.48550/arxiv.2201.01167
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Engineering Collection</collection><collection>ProQuest Central (Alumni)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering collection</collection><jtitle>arXiv.org</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Gupta, Rahul</au><au>Gupta, S</au><au>Chattopadhyay, T</au><au>Lipunov, V</au><au>Castro-Tirado, A J</au><au>Bhattacharya, D</au><au>Pandey, S B</au><au>Oates, S R</au><au>Kumar, Amit</au><au>Y -D Hu</au><au>Valeev, A F</au><au>P Yu Minaev</au><au>Kumar, H</au><au>Vinko, J</au><au>Dimple</au><au>Sharma, V</au><au>Aryan, A</au><au>Castellón, A</au><au>Gabovich, A</au><au>Moskvitin, A</au><au>Ordasi, A</au><au>Pál, A</au><au>Pozanenko, A</au><au>B -B Zhang</au><au>Kumar, B</au><au>Svinkin, D</au><au>Saraogi, D</au><au>Vlasenko, D</au><au>Fernández-García, E</au><au>Gorbovskoy, E</au><au>Anupama, G C</au><au>Misra, K</au><au>Sárneczky, K</au><au>Kriskovics, L</au><au>Castro-Tirado, M Á</au><au>Caballero-García, M D</au><au>Tiurina, N</au><au>Balanutsa, P</au><au>Lopez, R R</au><au>Sánchez-Ramírez, R</au><au>Szakáts, R</au><au>Belkin, S</au><au>Guziy, S</au><au>Iyyani, S</au><au>Tiwari, S N</au><au>Vadawale, Santosh V</au><au>Sun, T</au><au>Bhalerao, V</au><au>Kornilov, V</au><au>Sokolov, V V</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Probing into emission mechanisms of GRB 190530A using time-resolved spectra and polarization studies: Synchrotron Origin?</atitle><jtitle>arXiv.org</jtitle><date>2022-01-04</date><risdate>2022</risdate><eissn>2331-8422</eissn><abstract>Multi-pulsed GRB 190530A, detected by the GBM and LAT onboard \fermi, is the sixth most fluent GBM burst detected so far. This paper presents the timing, spectral, and polarimetric analysis of the prompt emission observed using \AstroSat and \fermi to provide insight into the prompt emission radiation mechanisms. The time-integrated spectrum shows conclusive proof of two breaks due to peak energy and a second lower energy break. Time-integrated (55.43 \(\pm\) 21.30 \%) as well as time-resolved polarization measurements, made by the Cadmium Zinc Telluride Imager (CZTI) onboard \AstroSat, show a hint of high degree of polarization. The presence of a hint of high degree of polarization and the values of low energy spectral index (\(\alpha_{\rm pt}\)) do not run over the synchrotron limit for the first two pulses, supporting the synchrotron origin in an ordered magnetic field. However, during the third pulse, \(\alpha_{\rm pt}\) exceeds the synchrotron line of death in few bins, and a thermal signature along with the synchrotron component in the time-resolved spectra is observed. Furthermore, we also report the earliest optical observations constraining afterglow polarization using the MASTER (P \(&lt;\) 1.3 \%) and the redshift measurement (\(z\)= 0.9386) obtained with the 10.4m GTC telescopes. The broadband afterglow can be described with a forward shock model for an ISM-like medium with a wide jet opening angle. We determine a circumburst density of \(n_{0} \sim\) 7.41, kinetic energy \(E_{\rm K} \sim\) 7.24 \(\times 10^{54}\) erg, and radiated \(\gamma\)-ray energy \(E_{\rm \gamma, iso} \sim\) 6.05 \(\times 10^{54}\) erg, respectively.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.2201.01167</doi><oa>free_for_read</oa></addata></record>
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identifier EISSN: 2331-8422
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subjects Broadband
Cadmium zinc tellurides
Emission analysis
Gamma rays
Kinetic energy
Polarization
Red shift
Spectra
Synchrotrons
Telescopes
Time measurement
Zinc telluride
Zinc tellurides
title Probing into emission mechanisms of GRB 190530A using time-resolved spectra and polarization studies: Synchrotron Origin?
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