DARK BURSTS IN THE SWIFT ERA: THE PALOMAR 60 INCH-SWIFT EARLY OPTICAL AFTERGLOW CATALOG

被引：100

作者：

Cenko, S. B. ^{[1
,2
]}

Kelemen, J. ^{[3
]}

Harrison, F. A. ^{[1
]}

Fox, D. B. ^{[4
]}

Kulkarni, S. R. ^{[5
]}

Kasliwal, M. M. ^{[5
]}

Ofek, E. O. ^{[5
]}

Rau, A. ^{[5
]}

Gal-Yam, A. ^{[6
]}

Frail, D. A. ^{[7
]}

Moon, D. -S. ^{[8
]}

机构：

[1] CALTECH, Space Radiat Lab, Pasadena, CA 91125 USA

[2] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[3] Konkoly Observ Budapest, H-1525 Budapest, Hungary

[4] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[5] CALTECH, Dept Astron, Pasadena, CA 91125 USA

[6] Weizmann Inst Sci, Benoziyo Ctr Astrophys, IL-76100 Rehovot, Israel

[7] Natl Radio Astron Observ, Socorro, NM 87801 USA

[8] Univ Toronto, Dept Astron & Astrophys, Toronto, ON M5S 3H4, Canada

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 693卷 / 02期

关键词：

gamma rays: bursts; GAMMA-RAY BURST; LIGHT CURVES; HOST GALAXY; REDSHIFT; DUST; IDENTIFICATION; GRB-051022; EMISSION; DENSITY; FLARES;

D O I：

10.1088/0004-637X/693/2/1484

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present multicolor optical observations of long-duration gamma-ray bursts (GRBs) made over a three-year period with the robotic Palomar 60 inch telescope (P60). Our sample consists of all 29 events discovered by Swift for which P60 began observations less than 1 hr after the burst trigger. We were able to recover 80% of the optical afterglows from this prompt sample, and we attribute this high efficiency to our red coverage. Like Melandri et al. (2008), we find that a significant fraction (approximate to 50%) of Swift events show a suppression of the optical flux with regard to the X-ray emission (the so-called "dark" bursts). Our multicolor photometry demonstrates this is likely due in large part to extinction in the host galaxy. We argue that previous studies, by selecting only the brightest and best-sampled optical afterglows, have significantly underestimated the amount of dust present in typical GRB environments.

引用

页码：1484 / 1493

页数：10

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