UV/Optical Properties of GRBs with Swift UVOT P. Roming (Penn State University)

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Presentation transcript:

UV/Optical Properties of GRBs with Swift UVOT P. Roming (Penn State University)

Burst Detection Distribution 229 observed GRBs –UVOT detected ~26% (individual exposure) –UVOT detected ~40% (combined exposure) –Ground-based detected ~60% (typically redder detections) –No detections ~40%

Why Are So Many “Dark”? Late observations Rapid temporal decay Circumburst extinction High redshift Ly- α blanketing & absorption Suppression of the reverse shock Wrong part of the sky

Time-to-burst Distribution 110 s 86 s

Color Observation Distribution Observations < 2000 sObservations > 2000 s

Peak Magnitude Brightness 18.02

Multicolor Light Curves of GRBs α=1.79α=1.59 α=1.51α=1.70 α=1.96α=1.94 α=1.58

Early “Flaring” in UV/Optical

Temporal Slope Distribution Color Independent Color Dependent 0.96 KS test = 0.087

Burst Color Evolution

Optical-to-X Comparison Spearman rank correlation (p = 8.8x10 -4 )

Optical-to- γ Comparison Spearman rank correlation (p = )

Redshift Distribution

UVOT Detected BAT Bursts

Observations of GRB

Event Mode Light Curves

Conclusions UV/optical single instrument samples becoming large enough to perform statistical analysis UV/optical regime trailing the X-ray but coming of age More data needed in the sample (i.e. multi-color information, SHBs light curves)