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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27006
Title: Behind the dust curtain: the spectacular case of GRB 160623A
Authors: Pintore, Fabio 
Tiengo, A.
MEREGHETTI, Sandro 
Vianello, G.
SALVATERRA, Ruben 
Esposito, P.
Costantini, E.
GIULIANI, ANDREA 
Bosnjak, Z.
Issue Date: 2017
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 472
Issue: 2
First Page: 1465
Abstract: We report on the X-ray dust-scattering features observed around the afterglow of the gamma-ray burst GRB 160623A. With an XMM-Newton observation carried out ∼2 d after the burst, we found evidence of at least six rings, with angular size expanding between ∼2 and 9 arcmin, as expected for X-ray scattering of the prompt gamma-ray burst (GRB) emission by dust clouds in our Galaxy. From the expansion rate of the rings, we measured the distances of the dust layers with extraordinary precision: 528.1 ± 1.2, 679.2 ± 1.9, 789.0 ± 2.8, 952 ± 5, 1539 ± 20 and 5079 ± 64 pc. A spectral analysis of the ring spectra, based on an appropriate dust-scattering model (BARE-GR-B) and the estimated burst fluence, allowed us to derive the column density of the individual dust layers, which are in the range 7 × 10<SUP>20</SUP>-1.5 × 10<SUP>22</SUP> cm<SUP>-2</SUP>. The farthest dust layer (i.e. the one responsible for the smallest ring) is also the one with the lowest column density and it is possibly very extended, indicating a diffuse dust region. The properties derived for the six dust layers (distance, thickness and optical depth) are generally in good agreement with independent information on the reddening along this line of sight and on the distribution of molecular and atomic gas.
URI: http://hdl.handle.net/20.500.12386/27006
URL: https://academic.oup.com/mnras/article/472/2/1465/4082223
ISSN: 0035-8711
DOI: 10.1093/mnras/stx2062
Bibcode ADS: 2017MNRAS.472.1465P
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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