Paper

Magnetar central engine powering the energetic GRB 210610B ?

Ror, Amit Kumar, Gupta, Rahul, Amar Aryan, Pandey, Shashi B

2024

Overview

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 (\\(\\alpha_{\\rm pt}\\)) 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 (E\\(_{\\rm \\gamma, \\theta_{j}}\\) = 1.06 \\(\\times\\) 10\\(^{51}\\) 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 (E\\(_{\\rm X,iso}\\) = 1.94 \\(\\times\\) 10\\(^{51}\\) 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.

• Publisher: Cornell University Library, arXiv.org
• Subject: Afterglows / Broadband / Emission analysis / Energy budget / Light curve / Magnetars / Red shift / Spectrum analysis / Thermal analysis