GRBs with no afterglow even in the Swift Era?
Abstract
Thanks to its great capability Swift succeeds detecting an afterglow more than 93% of the time BAT triggers a new event. In a few cases, mainly Short GRBs or late observations, XRT did not detect any emission. However, for at least seven Long GRBs XRT could not measure any X-afterglow either, even as early as 100 s after the BAT trigger. The detection of this new class of GRBs without any X-ray emission has raised many questions. Are these extreme naked GRB? Is this a completely new class of objects with an uncommon emission release? In this contribution we present a study on these unusual events. We analyse their peculiar behaviour in the Gamma and X-ray bands and discuss their singular origin.
- Publication:
-
Gamma-ray Burst: Sixth Huntsville Symposium
- Pub Date:
- May 2009
- DOI:
- 10.1063/1.3155877
- Bibcode:
- 2009AIPC.1133..199V
- Keywords:
-
- 98.70.Rz;
- 97.80.Jp;
- 82.33.Xj;
- gamma-ray sources;
- gamma-ray bursts;
- X-ray binaries;
- Plasma reactions