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J/A+A/607/A29       GRB 120327A afterglow colour variations    (Melandri+, 2017)

Colour variations in the GRB 120327A afterglow. Melandri A., Covino S., Zaninoni E., Campana S., Bolmer J., Cobb B.E., Gorosabel J., Kim J.-W., Kuin P., Kuroda D., Malesani D., Mundell C.G., Nappo F., Sbarufatti B., Smith R.J., Steele I.A., Topinka M., Trotter A.S., Virgili F.J., Bernardini M.G., D'Avanzo P., D'Elia V., Fugazza D., Ghirlanda G., Gomboc A., Greiner J., Guidorzi C., Haislip J.B., Hanayama H., Hanlon L., Im M., Ivarsen K.M., Japelj J., Jelinek M., Kawai N., Kobayashi S., Kopac D., LaCluyze A.P., Martin-Carrillo A., Murphy D., Reichart D.E., Salvaterra R., Salafia O.S., Tagliaferri G., Vergani S.D. <Astron. Astrophys. 607, A29 (2017)> =2017A&A...607..A29M (SIMBAD/NED BibCode)
ADC_Keywords: Gamma rays; Photometry, UBVRIJKLMNH; Photometry, ugriz; Magnitudes Keywords: gamma-ray burst: individual: GRB 120327A - dust, extinction Abstract: We present a comprehensive temporal and spectral analysis of the long Swift GRB120327A afterglow data to investigate the possible causes of the observed early time colour variations. We collected data from various instruments/telescopes in X-ray, ultra-violet, optical and near-infrared bands and determined the shapes of the afterglow early-time light curves. We studied the overall temporal behaviour and the spectral energy distributions from early to late times. The ultra-violet, optical, and near-infrared light curves can be modelled with a single power-law component between 200 and 2x104s after the burst event. The X-ray light curve shows a canonical steep-shallow-steep behaviour, typical of long gamma-ray bursts. At early times a colour variation is observed in the ultra-violet/optical bands, while at very late times a hint of a re-brightening is visible. The observed early time colour change can be explained as a variation in the intrinsic optical spectral index, rather than an evolution of the optical extinction. Description: Photometric data of GRB120327A are presented. Magnitudes are in the Vega system unless for griz filters that are in the AB system, and they are all not corrected for Galactic absorption. Errors are at 1sigma level. Objects: ---------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------- 16 27 25.00 -29 24 55.5 GRB 120327A = GRB 120327A ---------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 40 381 Photometric data for GRB120327A
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 I6 s T-T0 Delta T from the burst event (T-T0) (seconds) 8- 11 I4 s Exp Exposure length (seconds) 13- 17 F5.2 mag mag Magnitude in Band (1) 19- 22 F4.2 mag e_mag Magnitude error (1σ level) 24- 27 A4 --- Band Filter id 29- 40 A12 --- Tel Telescope name
Note (1): Magnitudes are in the Vega system unless for griz filters that are in the AB system, and they are all not corrected for Galactic absorption. Observed bands and number of observations: uvw1 (1), u (6) v (6), b (7), g (23), r (10), i (10), z (10), J (20), H (18), K (15), B (17), V (42), Rc (92), Ic (97), Y (1), C (6)
Acknowledgements: Andrea Meandri, andrea.melandri(at)brera.inaf.it
(End) Patricia Vannier [CDS] 26-Sep-2017
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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