Gupta, Rahul and Oates, S. R. and Pandey, S. B. and Castro-Tirado, A. J. and Joshi, Jagdish C. and Hu, Y. -D. and Valeev, A. F. and Zhang, B. B. and Zhang, Z. and Kumar, Amit and Aryan, A. and Lien, A. and Kumar, B. and Cui, Ch and Wang, Ch and Dimple and Bhattacharya, D. and Sonbas, E. and Bai, J. and Tello, J. C. and Gorosabel, J. and Castro Cerón, J. M. and Porto, J. R. F. and Misra, K. and De Pasquale, M. and Caballero-García, M. D. and Jelínek, M. and Kubánek, P. and Minaev, P. Yu and Cunniffe, R. and Sánchez-Ramírez, R. and Guziy, S. and Jeong, S. and Tiwari, S. N. and Razzaque, S. and Bhalerao, V. and Pintado, V. C. and Sokolov, V. V. and Zhao, X. and Fan, Y. and Xin, Y. (2021) GRB 140102A: insight into prompt spectral evolution and early optical afterglow emission. Monthly Notices of the Royal Astronomical Society, 505 (3). pp. 4086-4105. ISSN 0035-8711
Full text not available from this repository.Abstract
We present and perform a detailed analysis of multiwavelength observations of GRB 140102A, an optical bright GRB with an observed reverse shock (RS) signature. Observations of this GRB were acquired with the BOOTES-4 robotic telescope, the Fermi, and the Swift missions. Time-resolved spectroscopy of the prompt emission shows that changes to the peak energy (Ep) tracks intensity and the low-energy spectral index seems to follow the intensity for the first episode, whereas this tracking behaviour is less clear during the second episode. The fit to the afterglow light curves shows that the early optical afterglow can be described with RS emission and is consistent with the thin shell scenario of the constant ambient medium. The late time afterglow decay is also consistent with the prediction of the external forward shock model. We determine the properties of the shocks, Lorentz factor, magnetization parameters, and ambient density of GRB 140102A, and compare these parameters with another 12 GRBs, consistent with having RS produced by thin shells in an interstellar medium like medium. The value of the magnetization parameter (RB ≍ 18) indicates a moderately magnetized baryonic dominant jet composition for GRB 140102A. We also report the host galaxy photometric observations of GRB 140102A obtained with 10.4 m GTC, 3.5 m Calar Alto Astronomical Observatory, and 3.6 m Devasthal optical telescope and find the host (photo z = $2.8^{+0.7}_{-0.9}$) to be a high-mass, star-forming galaxy with a star formation rate of $20 \pm 10 {\rm ~M_{\odot }}\, \rm yr^{-1}$....