ESO’s VLT + X-Shooter observed AT2017gfo nightly for 10 consecutive nights after discovery providing complete spectral coverage from 3300 Angstroms to 2.5 microns. The data were published in the papers Pian et al. 2017, Nature, 551, 67 and Smartt et al. 2017, Nature, 551, 75. The ENGRAVE collaboration have fully reduced all the data in a uniform manner (data reduced by J. Selsing) and spectrophotometrically calibrated to published photometry of AT2017gfo (by J. Gillanders).
Various versions of the spectra are provided from the native dispersion of X-shooter to flux calibrated, smoothed, de-reddened versions. This compilation of spectra are available publicly and we encourage use of these data products as the definitive reductions and calibrations of the ESO X-Shooter campaign on AT2017go. The plots above and below illustrate the excellent agreement between the published photometry and the recalibrated X-Shooter spectral products and the high quality of the data products. For reference, we also include the HST spectra from Tanvir et al. (2017, ApJ, 848, L27).
These spectra represent full wavelength, daily coverage of AT2017gfo and we encourage use of these versions of the spectra as the definitive data products. They are available to download here.
Users must cite the original papers Pian et al. 2017, Nature, 551, 67 and Smartt et al. 2017, Nature, 551, 75 when using these X-Shooter data, and/or Tanvir et al. (2017, ApJ, 848, L27) when using the HST spectra. Users should check the file README.txt.
A compilation of homogenised photometry of AT2017gfo from various published sources is also provided and citations for the use of this file is included (see AT2017gfo_phot_compiled_sjs.dat).
X-Shooter and HST spectra of AT2017gfo (+5.40d - +7.40d) with accompanying photometry
X-Shooter and HST spectra of AT2017gfo (+8.40d - +10.40d) with accompanying photometry