Статья

Correlations of Prompt and Afterglow Emission in<i>Swift</i>Long and Short Gamma‐Ray Bursts

N. GehrelsNASA Goddard Space Flight Center, Greenbelt, MD 20771S. D. BarthelmyNASA Goddard Space Flight Center, Greenbelt, MD 20771D. N. BurrowsDepartment of Astronomy and Astrophysics, Pennsylvania State University, State College, PA 16802J. K. CannizzoCRESST/Joint Center for Astrophysics, University of Maryland, Baltimore County, Baltimore, MD 21250G. ChincariniINAF—Osservatorio Astronomico di Brera, 1-23807 Merate, ItalyE. FenimoreLos Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545C. KouveliotouNASA Marshall Space Flight Center, NSSTC, VP-62, 320 Sparkman Drive, Huntsville, AL 35805P. O’BrienDepartment of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UKD. M. PalmerLos Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545J. RacusinDepartment of Astronomy and Astrophysics, Pennsylvania State University, State College, PA 16802P. W. A. RomingDepartment of Astronomy and Astrophysics, Pennsylvania State University, State College, PA 16802T. SakamotoCRESST/Joint Center for Astrophysics, University of Maryland, Baltimore County, Baltimore, MD 21250J. TuellerNASA Goddard Space Flight Center, Greenbelt, MD 20771R. A. M. J. WijersFaculty of Science, Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, NetherlandsB. ZhangDepartment of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154

2008en

ABI

Аннотация

Correlation studies of prompt and afterglow emission from gamma-ray bursts (GRBs) between different spectral bands have been difficult to do in the past because few bursts had comprehensive and comparable afterglow measurements. In this paper we present a large and uniform data set for correlation analysis based on bursts detected by the Swift mission. For the first time, short and long bursts can be analyzed and compared. It is found for both classes that the optical, X-ray, and gamma-ray emission are linearly correlated, but with a large spread about the correlation line; stronger bursts tend to have brighter afterglow, and bursts with brighter X-ray afterglow tend to have brighter optical afterglow. Short bursts are, on average, weaker in both prompt and afterglow emission. No short bursts are seen with extremely low optical-to-X-ray ratios, as occurs for "dark" long bursts. Although statistics are still poor for short bursts, there is no evidence yet for a subgroup of short bursts with high extinction, as there is for long bursts. Long bursts are detected in the dark category in the same fraction as pre-Swift bursts. Interesting cases of long bursts that are detected in the optical, and yet have a low enough optical-to-X-ray ratio to be classified as dark, are discovered. For the prompt emission, short and long bursts have different average tracks on flux versus fluence plots. In Swift, GRB detections tend to be fluence-limited for short bursts and flux-limited for long events.

Перевод пока недоступен

Идентификаторы

DOI: 10.1086/592766

Цитирования и источники

Цитирований: 3Использованных источников: 0

Показатели — AkademScholar