Rossi, A.A.RossiPiranomonte, S.S.PiranomonteSavaglio, S.S.SavaglioD'Elia, ValerioValerioD'Elia2020-09-172020-09-172014-08-01https://hdl.handle.net/20.500.13025/3920eprint arXiv 1409.0017Long-duration gamma-ray bursts (LGRBs) are produced by the collapse of very massive stars. Due to the short lifetime of their progenitors, LGRBs pinpoint star-forming galaxies. We present here a multi-band search for the host galaxy of the long dark GRB 050219A within the enhanced Swift/XRT error circle. We used spectroscopic observations acquired with VLT/X-shooter to determine the redshift and star-formation rate of the putative host galaxy. We compared the results with the optical/IR spectral energy distribution obtained with different facilities. Surprisingly, the host galaxy is a old and quiescent early-type galaxy at z = 0.211 characterised by an unprecedentedly low specific star-formation rate. It is the first LGRB host to be also an early-type post-starburst galaxy. This is further evidence that GRBs can explode in all kind of galaxies, with the only requirement being an episode of star-formation.Astrophysics - High Energy Astrophysical Phenomena Comment 11 pageshttp://adsabs.harvard.edu/abs/2014arXiv1409.0017R2014arXiv1409.0017R