| Title: |
Multiwavelength observations of GRB 140629A: a long burst with an achromatic jet break in the optical and X-ray afterglow |
| Authors: |
Hu, YD; Oates, S.R.; Lipunov, V. M.; Zhang, BB; Castro-Tirado, Alberto J.; Jeong, S.; Sánchez Ramírez, Rubén; Tello, J. C.; Cunniffe, R.; Gorbovskoy, E; Caballero-García, María Dolores; Pandey, Shashi Bhushan; Kornilov, V. G.; Tyurina, NV; Kuznetsov, AS; Balanutsa, PV; Gress, OA; Gorbunov, I.; Vlasenko, DM; Vladimirov, VV; Budnev, NM; Balakin, F; Ershova, O.; Krushinski, VV; Gabovich, A.; Yurkov, VV; Gorosabel, Javier; Moskvitin, AS; Burenin, RA; Sokolov, Vladimir V.; Delgado, I.; Guziy, Sergey; Fernández-García, E.; Park, I. H. |
| Contributors: |
China Scholarship Council; Ministerio de Economía y Competitividad (España); European Commission; Leverhulme Trust; Agenzia Spaziale Italiana; Ministry of Education and Science of the Russian Federation; National Key Research and Development Program (China); Consejo Superior de Investigaciones Científicas https://ror.org/02gfc7t72 |
| Publisher Information: |
EDP Sciences |
| Publication Year: |
2019 |
| Collection: |
Digital.CSIC (Consejo Superior de Investigaciones Científicas / Spanish National Research Council) |
| Subject Terms: |
gamma-ray burst; General; Individual; GRB 140629A |
| Description: |
We investigate the long gamma-ray burst (GRB) 140629A through multiwavelength observations to derive the properties of the dominant jet and its host galaxy. Methods. The afterglow and host galaxy observations were taken in the optical (Swift/UVOT and various facilities worldwide), infrared (Spitzer), and X-rays (Swift/XRT) between 40 s and 3 yr after the burst trigger. Results. Polarisation observations by the MASTER telescope indicate that this burst is weakly polarised. The optical spectrum contains absorption features, from which we confirm the redshift of the GRB as originating at z=2.276 +/- 0.001. We performed spectral fitting of the X-rays to optical afterglow data and find there is no strong spectral evolution. We determine the hydrogen column density N-H to be 7.2 x 10(21) cm(-2) along the line of sight. The afterglow in this burst can be explained by a blast wave jet with a long-lasting central engine expanding into a uniform medium in the slow cooling regime. At the end of energy injection, a normal decay phase is observed in both the optical and X-ray bands. An achromatic jet break is also found in the afterglow light curves similar to 0.4 d after trigger. We fit the multiwavelength data simultaneously with a model based on a numerical simulation and find that the observations can be explained by a narrow uniform jet in a dense environment with an opening angle of 6.7 degrees viewed 3.8 degrees off-axis, which released a total energy of 1.4 x 10(54) erg. Using the redshift and opening angle, we find GRB 140629A follows both the Ghirlanda and Amati relations. From the peak time of the light curve, identified as the onset of the forward shock (181s after trigger), the initial Lorentz factor (Gamma(0)) is constrained in the range 82-118. Fitting the host galaxy photometry, we find the host to be a low mass, star-forming galaxy with a star formation rate of log (SFR) 1.1(-0.4)(+0.9) M(circle dot)log(SFR)=1.1-0.4+0.9M circle dot$ \log\mathrm{(SFR)}=1.1_{-0.4}{+0.9}\,M_\odot $ yr(-1). We obtain a ... |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
#PLACEHOLDER_PARENT_METADATA_VALUE#; info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2015-71718-R; info:eu-repo/grantAgreement/EC/H2020/654215; http://dx.doi.org/10.1051/0004-6361/201834959; Sí; Astronomy and Astrophysics 632: A100 (2019); https://hdl.handle.net/10261/203612; http://dx.doi.org/10.13039/501100000780; http://dx.doi.org/10.13039/501100000275; http://dx.doi.org/10.13039/501100003329; http://dx.doi.org/10.13039/501100003443; http://dx.doi.org/10.13039/501100003981; http://dx.doi.org/10.13039/501100004543 |
| DOI: |
10.1051/0004-6361/201834959 |
| DOI: |
10.13039/501100000780 |
| DOI: |
10.13039/501100000275 |
| DOI: |
10.13039/501100003329 |
| DOI: |
10.13039/501100003443 |
| DOI: |
10.13039/501100003981 |
| DOI: |
10.13039/501100004543 |
| Availability: |
https://hdl.handle.net/10261/203612; https://doi.org/10.1051/0004-6361/201834959; https://doi.org/10.13039/501100000780; https://doi.org/10.13039/501100000275; https://doi.org/10.13039/501100003329; https://doi.org/10.13039/501100003443; https://doi.org/10.13039/501100003981; https://doi.org/10.13039/501100004543 |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.7F9D9EE4 |
| Database: |
BASE |