| Name: Anshika Gupta |
| Affiliation: Aryabhatta Research Institute of observational Sciences (ARIES), Nainital |
| Conference ID: ASI2026_657 |
| Title: Prompt and afterglow properties of the long duration GRB 210306A |
| Abstract Type: Poster |
| Abstract Category: High Energy Phenomena, Fundamental Physics and Astronomy |
| Author(s) and Co-Author(s) with Affiliation: Anshika Gupta(Aryabhatta Research Institute of Observational Sciences), Kuntal Misra(Aryabhatta Research Institute of observational Sciences), Dimple(The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom) |
| Abstract: The long-duration GRB 210306A was detected by the Swift-BAT and Fermi/GBM with a T90 duration of around 9 sec. The Fermi/LAT detected the highest energy photon of 1.2 GeV associated with the GRB event. An uncataloged X-ray and optical source was detected by the Swift XRT and UVOT telescopes. The optical afterglow was observed with several ground-based telescopes. The prompt emission spectrum was best fit with a cutoff power law function with Ep = 60.41 ± 2.54 keV. The wide energy band Fermi-GBM data were used to perform time-resolved spectroscopy during the burst phase to study the evolution of the different parameters, such as the Ep, photon index, and Band function indices (α, β). GRB 210306A follows the long GRB trend in the Amati and Yonetoku correlations. The multiwavelength afterglow evolution of the GRB was modelled using the forward shock model, incorporating Bayesian parameter estimation. The X-ray afterglow light curve shows an early break in the light curve, which is absent in the optical light curves, indicating that the break is not due to a jet break. We constrain the kinetic energy of the burst, the ambient medium density, and the
shock microphysical parameters with the multiwavelength modeling. |
