Prompt Emission and Early Optical Afterglow of Very-high-energy Detected GRB 201015A and GRB 201216C: Onset of the External Forward Shock
We present a detailed prompt emission and early optical afterglow analysis of the two very-high-energy (VHE) detected bursts GRB 201015A and GRB 201216C, and their comparison with a subset of similar bursts. Time-resolved spectral analysis of multistructured GRB 201216C using the Bayesian binning al...
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/aca414 |
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| author | Amit Kumar Ror Rahul Gupta Martin Jelínek Shashi Bhushan Pandey A. J. Castro-Tirado Y.-D. Hu Alžběta Maleňáková Jan Štrobl Christina C. Thöne René Hudec Sergey Karpov Amit Kumar A. Aryan S. R. Oates E. Fernández-García C. Pérez del Pulgar M. D. Caballero-García A. Castellón I. M. Carrasco-García I. Pérez-García A. J. Reina Terol F. Rendon |
| author_facet | Amit Kumar Ror Rahul Gupta Martin Jelínek Shashi Bhushan Pandey A. J. Castro-Tirado Y.-D. Hu Alžběta Maleňáková Jan Štrobl Christina C. Thöne René Hudec Sergey Karpov Amit Kumar A. Aryan S. R. Oates E. Fernández-García C. Pérez del Pulgar M. D. Caballero-García A. Castellón I. M. Carrasco-García I. Pérez-García A. J. Reina Terol F. Rendon |
| author_sort | Amit Kumar Ror |
| collection | DOAJ |
| description | We present a detailed prompt emission and early optical afterglow analysis of the two very-high-energy (VHE) detected bursts GRB 201015A and GRB 201216C, and their comparison with a subset of similar bursts. Time-resolved spectral analysis of multistructured GRB 201216C using the Bayesian binning algorithm revealed that during the entire duration of the burst, the low-energy spectral index ( α _pt ) remained below the limit of the synchrotron line of death. However, statistically some of the bins supported the additional thermal component. Additionally, the evolution of spectral parameters showed that both the peak energy ( E _p ) and α _pt tracked the flux. These results were further strengthened using the values of the physical parameters obtained by synchrotron modeling of the data. Our earliest optical observations of both bursts using the F/Photometric Robotic Atmospheric Monitor Observatorio del Roque de los Muchachos and Burst Observer and Optical Transient Exploring System robotic telescopes displayed a smooth bump in their early optical light curves, consistent with the onset of the afterglow due to synchrotron emission from an external forward shock. Using the observed optical peak, we constrained the initial bulk Lorentz factors of GRB 201015A and GRB 201216C to Γ _0 = 204 and Γ _0 = 310, respectively. The present early optical observations are the earliest known observations constraining outflow parameters and our analysis indicate that VHE detected bursts could have a diverse range of observed luminosity within the detectable redshift range of present VHE facilities. |
| first_indexed | 2024-03-12T04:33:42Z |
| format | Article |
| id | doaj.art-4792330b17dc4d2fa6f0555a8895da27 |
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| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:33:42Z |
| publishDate | 2023-01-01 |
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| series | The Astrophysical Journal |
| spelling | doaj.art-4792330b17dc4d2fa6f0555a8895da272023-09-03T09:58:11ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0194213410.3847/1538-4357/aca414Prompt Emission and Early Optical Afterglow of Very-high-energy Detected GRB 201015A and GRB 201216C: Onset of the External Forward ShockAmit Kumar Ror0https://orcid.org/0000-0003-3164-8056Rahul Gupta1Martin Jelínek2https://orcid.org/0000-0003-3922-7416Shashi Bhushan Pandey3A. J. Castro-Tirado4Y.-D. Hu5https://orcid.org/0000-0002-7400-4608Alžběta Maleňáková6https://orcid.org/0000-0002-0636-9138Jan Štrobl7https://orcid.org/0000-0002-4147-2878Christina C. Thöne8https://orcid.org/0000-0002-7978-7648René Hudec9Sergey Karpov10https://orcid.org/0000-0003-0035-651XAmit Kumar11https://orcid.org/0000-0002-4870-9436A. Aryan12https://orcid.org/0000-0002-9928-0369S. R. Oates13E. Fernández-García14C. Pérez del Pulgar15M. D. Caballero-García16https://orcid.org/0000-0001-7920-4564A. Castellón17https://orcid.org/0000-0003-4646-0451I. M. Carrasco-García18I. Pérez-García19A. J. Reina Terol20F. Rendon21Aryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak, Nainital-263002, India ; amitror@aries.res.in, rahulbhu.c157@gmail.com, shashi@aries.res.inAryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak, Nainital-263002, India ; amitror@aries.res.in, rahulbhu.c157@gmail.com, shashi@aries.res.in; Department of Physics, Deen Dayal Upadhyaya Gorakhpur University , Gorakhpur-273009, IndiaAstronomical Institute of the Czech Academy of Sciences (ASU-CAS) , Fričova 298, 251 65 Ondřejov, Czech RepublicAryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak, Nainital-263002, India ; amitror@aries.res.in, rahulbhu.c157@gmail.com, shashi@aries.res.inInstituto de Astrofísica de Andalucía (IAA-CSIC) , Glorieta de la Astronomía s/n, E-18008, Granada, Spain; Unidad Asociada al CSIC Departamento de Ingeniería de Sistemas y Automática, Escuela de Ingenierías, Universidad de Málaga , C. Dr. Ortiz Ramos sn, E-29071, Málaga, SpainInstituto de Astrofísica de Andalucía (IAA-CSIC) , Glorieta de la Astronomía s/n, E-18008, Granada, SpainAstronomical Institute of the Czech Academy of Sciences (ASU-CAS) , Fričova 298, 251 65 Ondřejov, Czech RepublicAstronomical Institute of the Czech Academy of Sciences (ASU-CAS) , Fričova 298, 251 65 Ondřejov, Czech RepublicAstronomical Institute of the Czech Academy of Sciences (ASU-CAS) , Fričova 298, 251 65 Ondřejov, Czech RepublicAstronomical Institute of the Czech Academy of Sciences (ASU-CAS) , Fričova 298, 251 65 Ondřejov, Czech RepublicInstitute of Physics of the Czech Academy of Sciences (FZU AV ČR) , Na Slovance 2, Praha 8, Czech RepublicAryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak, Nainital-263002, India ; amitror@aries.res.in, rahulbhu.c157@gmail.com, shashi@aries.res.in; Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, UKAryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak, Nainital-263002, India ; amitror@aries.res.in, rahulbhu.c157@gmail.com, shashi@aries.res.in; Department of Physics, Deen Dayal Upadhyaya Gorakhpur University , Gorakhpur-273009, IndiaSchool of Physics and Astronomy & Institute for Gravitational Wave Astronomy, University of Birmingham , B15 2TT, UKInstituto de Astrofísica de Andalucía (IAA-CSIC) , Glorieta de la Astronomía s/n, E-18008, Granada, SpainUnidad Asociada al CSIC Departamento de Ingeniería de Sistemas y Automática, Escuela de Ingenierías, Universidad de Málaga , C. Dr. Ortiz Ramos sn, E-29071, Málaga, SpainInstituto de Astrofísica de Andalucía (IAA-CSIC) , Glorieta de la Astronomía s/n, E-18008, Granada, SpainFacultad de Ciencias, Universidad de Málaga , E-29010 Málaga, SpainFacultad de Ciencias, Universidad de Málaga , E-29010 Málaga, SpainInstituto de Astrofísica de Andalucía (IAA-CSIC) , Glorieta de la Astronomía s/n, E-18008, Granada, SpainUnidad Asociada al CSIC Departamento de Ingeniería de Sistemas y Automática, Escuela de Ingenierías, Universidad de Málaga , C. Dr. Ortiz Ramos sn, E-29071, Málaga, SpainInstituto de Astrofísica de Andalucía (IAA-CSIC) , Glorieta de la Astronomía s/n, E-18008, Granada, SpainWe present a detailed prompt emission and early optical afterglow analysis of the two very-high-energy (VHE) detected bursts GRB 201015A and GRB 201216C, and their comparison with a subset of similar bursts. Time-resolved spectral analysis of multistructured GRB 201216C using the Bayesian binning algorithm revealed that during the entire duration of the burst, the low-energy spectral index ( α _pt ) remained below the limit of the synchrotron line of death. However, statistically some of the bins supported the additional thermal component. Additionally, the evolution of spectral parameters showed that both the peak energy ( E _p ) and α _pt tracked the flux. These results were further strengthened using the values of the physical parameters obtained by synchrotron modeling of the data. Our earliest optical observations of both bursts using the F/Photometric Robotic Atmospheric Monitor Observatorio del Roque de los Muchachos and Burst Observer and Optical Transient Exploring System robotic telescopes displayed a smooth bump in their early optical light curves, consistent with the onset of the afterglow due to synchrotron emission from an external forward shock. Using the observed optical peak, we constrained the initial bulk Lorentz factors of GRB 201015A and GRB 201216C to Γ _0 = 204 and Γ _0 = 310, respectively. The present early optical observations are the earliest known observations constraining outflow parameters and our analysis indicate that VHE detected bursts could have a diverse range of observed luminosity within the detectable redshift range of present VHE facilities.https://doi.org/10.3847/1538-4357/aca414Gamma-ray bursts |
| spellingShingle | Amit Kumar Ror Rahul Gupta Martin Jelínek Shashi Bhushan Pandey A. J. Castro-Tirado Y.-D. Hu Alžběta Maleňáková Jan Štrobl Christina C. Thöne René Hudec Sergey Karpov Amit Kumar A. Aryan S. R. Oates E. Fernández-García C. Pérez del Pulgar M. D. Caballero-García A. Castellón I. M. Carrasco-García I. Pérez-García A. J. Reina Terol F. Rendon Prompt Emission and Early Optical Afterglow of Very-high-energy Detected GRB 201015A and GRB 201216C: Onset of the External Forward Shock The Astrophysical Journal Gamma-ray bursts |
| title | Prompt Emission and Early Optical Afterglow of Very-high-energy Detected GRB 201015A and GRB 201216C: Onset of the External Forward Shock |
| title_full | Prompt Emission and Early Optical Afterglow of Very-high-energy Detected GRB 201015A and GRB 201216C: Onset of the External Forward Shock |
| title_fullStr | Prompt Emission and Early Optical Afterglow of Very-high-energy Detected GRB 201015A and GRB 201216C: Onset of the External Forward Shock |
| title_full_unstemmed | Prompt Emission and Early Optical Afterglow of Very-high-energy Detected GRB 201015A and GRB 201216C: Onset of the External Forward Shock |
| title_short | Prompt Emission and Early Optical Afterglow of Very-high-energy Detected GRB 201015A and GRB 201216C: Onset of the External Forward Shock |
| title_sort | prompt emission and early optical afterglow of very high energy detected grb 201015a and grb 201216c onset of the external forward shock |
| topic | Gamma-ray bursts |
| url | https://doi.org/10.3847/1538-4357/aca414 |
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