The host-galaxy response to the afterglow of GRB 100901A

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The host-galaxy response to the afterglow of GRB 100901A

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Title: The host-galaxy response to the afterglow of GRB 100901A
Author: Hartoog, O. E.; Wiersema, K.; Vreeswijk, P. M.; Kaper, L.; Tanvir, N. R.; Savaglio, S.; Berger, Edo; Chornock, R; Covino, S.; D, V.; Flores, H.; Fynbo, J. P. U.; Goldoni, P.; Gomboc, A.; Melandri, A.; Pozanenko, A.; Schaye, J.; Postigo, A. d. U.; Wijers, R. A. M. J.

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Citation: Hartoog, O. E., K. Wiersema, P. M. Vreeswijk, L. Kaper, N. R. Tanvir, S. Savaglio, E. Berger, et al. 2013. The Host-Galaxy Response to the Afterglow of GRB 100901A. Monthly Notices of the Royal Astronomical Society 430, no. 4: 2739–2754. doi:10.1093/mnras/stt078.
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Abstract: For Gamma-Ray Burst 100901A, we have obtained Gemini-North and Very Large Telescope optical afterglow spectra at four epochs: one hour, one day, three days and one week after the burst, thanks to the afterglow remaining unusually bright at late times. Apart from a wealth of metal resonance lines, we also detect lines arising from fine-structure levels of the ground state of Fe ii, and from metastable levels of Fe ii and Ni ii at the host redshift (z = 1.4084). These lines are found to vary significantly in time. The combination of the data and modelling results shows that we detect the fall of the Ni ii 4F9/2 metastable level population, which to date has not been observed. Assuming that the population of the excited states is due to the UV-radiation of the afterglow, we estimate an absorber distance of a few hundred pc. This appears to be a typical value when compared to similar studies. We detect two intervening absorbers (z = 1.3147, 1.3179). Despite the wide temporal range of the data, we do not see significant variation in the absorption lines of these two intervening systems.
Published Version: doi:10.1093/mnras/stt078
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