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J/MNRAS/464/4545 Gamma Ray Bursts detected by Swift (2004-2015) (Buchner+, 2017)

Galaxy gas as obscurer. I. GRBs X-ray galaxies and find an NH3 ∝ M* relation. Buchner J., Schulze S., Bauer F. <Mon. Not. R. Astron. Soc. 464, 4545 (2017)> =2017MNRAS.464.4545B (SIMBAD/NED BibCode)
ADC_Keywords: Gamma rays ; Abundances Keywords: gamma-ray burst: general - galaxies: ISM - Magellanic Clouds - galaxies: structure - X-rays: galaxies - X-rays: ISM Abstract: An important constraint for galaxy evolution models is how much gas resides in galaxies, in particular, at the peak of star formation z=1-3. We attempt a novel approach by letting long-duration gamma ray bursts (LGRBs) x-ray their host galaxies and deliver column densities to us. This requires a good understanding of the obscurer and biases introduced by incomplete follow-up observations. We analyse the X-ray afterglow of all 844 Swift LGRBs to date for their column density NH. To derive the population properties, we propagate all uncertainties in a consistent Bayesian methodology. The NH distribution covers the 1020-23%cm-2^ range and shows no evolutionary effect. Higher obscurations, e.g. Compton-thick columns, could have been detected but are not observed. The NH distribution is consistent with sources randomly populating a ellipsoidal gas cloud of major axis NHmajor=1023cm-2 with 0.22dex intrinsic scatter between objects. The unbiased SHOALS survey of afterglows and hosts allows us to constrain the relation between Spitzer-derived stellar masses and X-ray derived column densities NH. We find a well-constrained power-law relation of NH=1021.7cm-2x(M*/109.5M)1/3, with 0.5dex intrinsic scatter between objects. The Milky Way and the Magellanic clouds also follow this relation. From the geometry of the obscurer, its stellar mass dependence and comparison with local galaxies, we conclude that LGRBs are primarily obscured by galaxy-scale gas. Ray tracing of simulated Illustris galaxies reveals a relation of the same normalization, but a steeper stellar-mass dependence and mild redshift evolution. Our new approach provides valuable insight into the gas residing in high-redshift galaxies. Description: Gamma Ray Bursts (GRB) typically show intrinsic LOS column densities of 1021-23cm2. We performed a thorough statistical analysis of all available X-ray spectra of Swift-detected GRBs. In the associated paper we use sub-samples to analyse the population properties of LGRB and concluded that the obscuration is due to large-scale gas inside the GRB host galaxy, due to the shape of the column density distribution and its correlation with host stellar mass. This catalogue presents X-ray spectral analysis of all Swift-detected GRBs. It includes information about the GRB (ID, Swift Trigger ID, duration, RA/Dec in J2000, galactic coordinates, Milky Way column density). Those properties are taken from the and websites. We removed prompt emission and flares, leaving only a certain time interval for spectral extraction. We use two models to analyse X-ray spectra: TBABS and SPHERE. Both include updated abundances and cross-sections as compared to previous works. The latter includes the effects of Compton-scattering and FeKa fluorescence relevant at high column densities. Columns list the posterior mean, standard deviation, 10% and 90% quantiles. Note that the column densities are converted to hydrogen assuming local ISM abundances, but are derived primarily from photo-electric absorption of e.g. Fe and O, and therefore primarily measure metal gas. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file grbcat.dat 270 920 Catalog of SWIFT GRB (2004-2015) grbcat.fits 2880 88 FITS version of the catalog
See also: IX/43 : 1SXPS Swift X-ray telescope point source catalog (Evans+ 2014) J/A+A/510/A48 : Palermo Swift-BAT Hard X-ray Catalogue (Cusumano+, 2010) J/A+A/528/A122 : SwiftFT catalog (Puccetti+, 2011) J/ApJS/195/2 : The second Swift BAT GRB catalog (BAT2) (Sakamoto+, 2011) J/ApJS/201/34 : Swift-INTEGRAL X-ray (SIX) survey (Bottacini+, 2012) J/ApJS/209/20 : Swift GRB catalog with X-ray data (Grupe+, 2013) J/A+A/551/A142 : 7 year Swift-XRT point source catalog (1SWXRT) (D'Elia+, 2013) J/A+A/562/A2 : 100-month Swift catalogue of SFXTs (Romano+, 2014) Byte-by-byte Description of file: grbcat.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name GRB ID (GRB YYMMDDA) 13- 20 I8 --- Trigger Swift Trigger ID 22- 33 E12.6 s Dur ?=-1 Duration 35 I1 --- is_short [0/1] 1 if T90>2s 37- 45 F9.5 deg RAdeg Right ascension (J2000) 47- 56 F10.6 deg DEdeg Declination (J2000) 58- 66 F9.5 deg GLON Galactic longitude 68- 77 F10.6 deg GLAT Galactic latitude 79- 90 E12.6 [cm-2] NHgal Galactic column density 92- 99 F8.6 --- z Redshift 101-152 A52 s Tint Time interval(s) used for X-ray spectral extraction 154-161 F8.4 [cm-2] NHT ?=-99 Posterior mean column density derived using tbabs obscurer model 163-172 F10.6 [cm-2] e_NHT ?=-99 Standard deviation of NHT 174-181 F8.4 [cm-2] NHTq10 ?=-99 10% quantile of posterior NHT 183-190 F8.4 [cm-2] NHTq90 ?=-99 90% quantile of posterior NHT 192-200 F9.5 --- PhoIndexT ?=-99 Mean spectral slope, E 202-211 F10.6 --- e_PhoIndexT ?=-99 Standard deviation of PhoIndexT 213-220 F8.4 [cm-2] NHS ?=-99 Posterior mean column density derived using sphere obscurer model 222-231 F10.6 [cm-2] e_NHS ?=-99 Standard deviation of NHS 233-240 F8.4 [cm-2] NHSq10 ?=-99 10% quantile of posterior NHS 242-249 F8.4 [cm-2] NHSq90 ?=-99 90% quantile of posterior NHS 251-259 F9.5 --- PhoIndexS ?=-99 Mean spectral slope, E 261-270 F10.6 --- e_PhoIndexS ?=-99 Standard deviation of PhoIndexTS
Acknowledgements: Johannes Buchner, johannes.buchner.acad(at)
(End) Patricia Vannier [CDS] 16-Apr-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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