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20 April 2024 |
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Happy Birthday Swift: Ultra-long GRB141121A and its broad-band Afterglow | | A. Cucchiara
; P. Veres
; A. Corsi
; S. B. Cenko
; D. A. Perley
; A. Lien F. E. Marshall
; C. Pagani
; V. L. Toy
; J. I. Capone
; D. A. Frail
; A. Horesh
; M. Modjaz
; N. R. Butler
; O. M. Littlejohns
; A. M. Watson
; A. S. Kutyrev
; W. H. Lee
; M. G. Richer
; C. R. Klein
; O. D. Fox
; J. X. Prochaska
; J. S. Bloom
; E. Troja
; E. Ramirez-Ruiz
; J. A. de Diego
; L. Georgiev
; J. Gonzalez
; C. G. Roman-Zuniga
; N. Gehrels
; H. Moseley
; | | Date: |
5 Oct 2015 | | Abstract: | We present our extensive observational campaign on the Swift-discovered
GRB141121A, al- most ten years after its launch. Our observations covers radio
through X-rays, and extends for more than 30 days after discovery. The prompt
phase of GRB 141121A lasted 1410 s and, at the derived redshift of z = 1.469,
the isotropic energy is E{gamma},iso = 8.0x10^52 erg. Due to the long prompt
duration, GRB141121A falls into the recently discovered class of UL-GRBs.
Peculiar features of this burst are a flat early-time optical light curve and a
radio-to-X-ray rebrightening around 3 days after the burst. The latter is
followed by a steep optical-to-X-ray decay and a much shallower radio fading.
We analyze GRB 141121A in the context of the standard forward-reverse shock
(FS,RS) scenario and we disentangle the FS and RS contributions. Finally, we
comment on the puzzling early-time (t ~3 d) behavior of GRB 141121A, and
suggest that its interpretation may require a two-component jet model. Overall,
our analysis confirms that the class of UL-GRBs represents our best opportunity
to firmly establish the prominent emission mechanisms in action during powerful
GRB explosions, and future missions (like SVOM, XTiDE, or ISS-Lobster) will
provide many more of such objects. | | Source: | arXiv, 1510.0996 | | Services: | Forum | Review | PDF | Favorites | |
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