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We present our extensive observational campaign on the Swift-discoveredGRB141121A, al- most ten years after its launch. Our observations covers radiothrough X-rays, and extends for more than 30 days after discovery. The promptphase 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 promptduration, GRB141121A falls into the recently discovered class of UL-GRBs.Peculiar features of this burst are a flat early-time optical light curve and aradio-to-X-ray rebrightening around 3 days after the burst. The latter isfollowed 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, wecomment on the puzzling early-time (t ~3 d) behavior of GRB 141121A, andsuggest that its interpretation may require a two-component jet model. Overall,our analysis confirms that the class of UL-GRBs represents our best opportunityto firmly establish the prominent emission mechanisms in action during powerfulGRB explosions, and future missions (like SVOM, XTiDE, or ISS-Lobster) willprovide many more of such objects.

Happy Birthday Swift: Ultra-long GRB141121A and its broad-band Afterglow