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GRB 060206 and the quandary of achromatic breaks in afterglow light curves
P. A. Curran, A. J. van der Horst, R. A. M. J. Wijers +20
Gamma-ray burst afterglow observations in the Swift era have a perceived lack of achromatic jet breaks compared to the BeppoSAX era. We present our multi-wavelength analysis of GRB…
On the nature of the short duration GRB 050906
A. J. Levan, N. R. Tanvir, P. Jakobsson +12
We present deep optical and infrared observations of the short duration GRB 050906. Although no X-ray or optical/IR afterglow was discovered to deep limits, the error circle of the…
What made GRBs 060505 and 060614?
P. Jakobsson, J. P. U. Fynbo
Recent observations of two nearby SN-less long-duration gamma-ray bursts (GRBs), which share no obvious characteristics in their prompt emission, suggest a new phenomenological typ…
Very different X-ray to optical column density ratios in gamma-ray burst afterglows: ionisation in GRB environments
D. Watson, J. Hjorth, J. P. U. Fynbo +4
We compare the HI column densities from Ly-alpha absorption to the metal column densities from X-ray absorption in gamma-ray burst (GRB) afterglows. Eight bursts of seventeen enter…
The nature of the X-Ray Flash of August 24 2005
J. Sollerman, J. P. U. Fynbo, J. Gorosabel +23
We present comprehensive photometric R-band observations of the fading optical afterglow of the X-Ray Flash XRF050824, from 11 minutes to 104 days after the burst. The R-band light…
The soft X-ray blast in the apparently sub-luminous GRB 031203
D. Watson, S. A. Vaughan, R. Willingale +11
GRB031203 was a very low apparent luminosity gamma-ray burst (GRB). It was also the first GRB with a dust-scattered X-ray halo. The observation of the halo allowed us to infer the…