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arXiv · 1510.00996

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
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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 Eγ,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.

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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. 2015-10-04. Happy Birthday Swift: Ultra-long GRB141121A and its broad-band Afterglow. https://doi.org/10.1088/0004-637x%2F812%2F2%2F122

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