A Large Catalog of Homogeneous Ultra-Violet/Optical GRB Afterglows: Temporal and Spectral Evolution

Peter W.A. Roming, T. Scott Koch, Samantha R. Oates, Blair L. Porterfield, Amanda J. Bayless, Alice A. Breeveld, Caryl Gronwall, N. P.M. Kuin, Mat J. Page, Massimiliano De Pasquale, Michael H. Siegel, Craig A. Swenson, Jennifer M. Tobler

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Abstract

We present the second Swift Ultra-Violet/Optical Telescope (UVOT) gamma-ray burst (GRB) afterglow catalog, greatly expanding on the first Swift UVOT GRB afterglow catalog. The second catalog is constructed from a database containing over 120,000 independent UVOT observations of 538 GRBs first detected by Swift, the High Energy Transient Explorer 2 (HETE2), the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL), the Interplanetary Network (IPN), Fermi, and Astro-rivelatore Gamma a Immagini Leggero (AGILE). The catalog covers GRBs discovered from 2005 January 17 to 2010 December 25. Using photometric information in three UV bands, three optical bands, and a "white" or open filter, the data are optimally coadded to maximize the number of detections and normalized to one band to provide a detailed light curve. The catalog provides positional, temporal, and photometric information for each burst, as well as Swift Burst Alert Telescope and X-ray Telescope (XRT) GRB parameters. Temporal slopes are provided for each UVOT filter. The temporal slope per filter of almost half the GRBs are fit with a single power law, but one to three breaks are required in the remaining bursts. Morphological comparisons with the X-ray reveal that of the UVOT light curves are similar to one of the four morphologies identified by Evans et al. (2009). The remaining have a newly identified morphology. For many bursts, redshift- and extinction-corrected UV/optical spectral slopes are also provided at 2 × 103, 2 ×104, and 2 ×105 s.

Original languageEnglish (US)
Article number13
JournalAstrophysical Journal, Supplement Series
Volume228
Issue number2
DOIs
StatePublished - Feb 2017

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Roming, P. W. A., Koch, T. S., Oates, S. R., Porterfield, B. L., Bayless, A. J., Breeveld, A. A., Gronwall, C., Kuin, N. P. M., Page, M. J., Pasquale, M. D., Siegel, M. H., Swenson, C. A., & Tobler, J. M. (2017). A Large Catalog of Homogeneous Ultra-Violet/Optical GRB Afterglows: Temporal and Spectral Evolution. Astrophysical Journal, Supplement Series, 228(2), [13]. https://doi.org/10.3847/1538-4365/228/2/13