Bulletin de la Société Royale des Sciences de Liège Bulletin de la Société Royale des Sciences de Liège -  Volume 93 - Année 2024  No 2 - Proceeedings of the 3rd BINA Workshop on the Scientific Potential of the Indo-Belgian Cooperation 

Magnetar Central Engine Powering the Energetic GRB 210610B?

Amit Kumar Ror
Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital-263002, India and Department of Applied Physics, Mahatma Jyotiba Phule Rohilkhand University, Bareilly-243006, India. Corresponding author: amitror@aries.res.in
Shashi Bhushan Pandey
Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital-263002, India
Rahul Gupta
Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital-263002, India and Department of Physics, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur-273009, India
Amar Aryan
Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital-263002, India and Department of Physics, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur-273009, India

Abstract

The bright GRB 210610B was discovered simultaneously by Fermi and Swift missions at redshift 1.13. We utilized broadband Fermi-GBM observations to perform a detailed prompt emission spectral analysis and to understand the radiation physics of the burst. Our analysis displayed that the low energy spectral index (αpt) exceeds boundaries expected from the typical synchrotron emission spectrum (-1.5,-0.67), suggesting additional emission signature. We added an additional thermal model with the typical Band or CPL function and found that CPL + BB function is better fitting to the data, suggesting a hybrid jet composition for the burst. Further, we found that the beaming corrected energy (Eγ,θj = 1.06 × 1051 erg) of the burst is less than the total energy budget of the magnetar. Additionally, the X-ray afterglow light curve of this burst exhibits achromatic plateaus, adding another layer of complexity to the explosion’s behavior. Interestingly, we noted that the X-ray energy release during the plateau phase (EX,iso = 1.94 × 1051 erg) is also less than the total energy budget of the magnetar. Our results indicate the possibility that a magnetar could be the central engine for this burst.

Keywords : Gamma-ray burst, Synchrotron, Thermal, Magnetar

Pour citer cet article

Amit Kumar Ror, Shashi Bhushan Pandey, Rahul Gupta & Amar Aryan, «Magnetar Central Engine Powering the Energetic GRB 210610B?», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 93 - Année 2024, No 2 - Proceeedings of the 3rd BINA Workshop on the Scientific Potential of the Indo-Belgian Cooperation, 709-718 URL : http://popups.ulg.be/0037-9565/index.php?id=11848.