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GRB Flares: A New Detection Algorithm, Previously Undetected Flares, and Implications on GRB Physics | C. A. Swenson
; P. W. A. Roming
; | Date: |
21 Aug 2013 | Abstract: | Flares in GRB light curves have been observed since shortly after the
discovery of the first GRB afterglow. However, it was not until the launch of
the Swift satellite that it was realized how common flares are, appearing in
nearly 50% of all X-ray afterglows as observed by the XRT instrument. The
majority of these observed X-ray flares are easily distinguishable by eye and
have been measured to have up to as much fluence as the original prompt
emission. Through studying large numbers of these X-ray flares it has been
determined that they likely result from a distinct emission source different
than that powering the GRB afterglow. These findings could be confirmed if
similar results were found using flares in other energy ranges. However, until
now, the UVOT instrument on Swift seemed to have observed far fewer flares in
the UV/optical than were seen in the X-ray. This was primarily due to poor
sampling and data being spread across multiple filters, but a new optimal
co-addition and normalization of the UVOT data has allowed us to search for
flares in the UV/optical that have previously gone undetected. Using a flare
finding algorithm based on the Bayesian Information Criterion, we have analyzed
the light curves in the Second UVOT GRB Catalog and present the finding of at
least 118 unique flares detected in 68 GRB afterglows. | Source: | arXiv, 1308.4600 | Services: | Forum | Review | PDF | Favorites |
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