GRB 060607A: A GRB with Bright Asynchronous Early $X$-ray and Optical Emissions

Details GRB 060607A: A GRB with Bright Asynchronous Early $X$-ray and Optical Emissions GRB 060607A: A GRB with Bright Asynchronous Early $X$-ray and Optical Emissions

2007-12-19

arxiv.org/abs/0712.3269v1

Mon.Not.Roy.Astron.Soc.385:453,2008

Astronomy and Astrophysics

Astrophysics

17 pages; 9 figures; Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2008.12859.x

The early optical emission of the moderately high redshift ($z=3.08$) GRB 060607A shows a remarkable broad and strong peak with a rapid rise and a relatively slow power-law decay. It is not coincident with the strong early-time flares seen in the X-ray and gamma-ray energy bands. There is weak evidence for variability superposed on this dominant component in several optical bands that can be related to flares in high energy bands. While for a small number of GRBs, well-sampled optical flares have been observed simultaneously with X-ray and gamma ray pulses, GRB 060607A is one of the few cases where the early optical emission shows no significant evidence for correlation with the prompt emission. In this work we first report in detail the broad band observations of this burst by Swift. Then by applying a simple model for the dynamics and the synchrotron radiation of a relativistic shock, we show that the dominant component of the early emissions in optical wavelengths has the same origin as the tail emission produced after the main gamma ray activity. The most plausible explanation for the peak in the optical light curve seems to be the cooling of the prompt after the main collisions, shifting the characteristic synchrotron frequency to the optical bands. It seems that the cooling process requires a steepening of the electron energy distribution and/or a break in this distribution at high energies. The sharp break in the X-ray light curve at few thousands of seconds after the trigger, is not observed in the IR/optical/UV bands, and therefore can not be a jet break. Either the X-ray break is due to a change in the spectrum of the accelerated electrons or the lack of an optical break is due to the presence of a related delayed response component (Abbreviated).

Affiliated with

Also associated with

No associations

Rating

GRB 060607A: A GRB with Bright Asynchronous Early $X$-ray and Optical Emissions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with GRB 060607A: A GRB with Bright Asynchronous Early $X$-ray and Optical Emissions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and GRB 060607A: A GRB with Bright Asynchronous Early $X$-ray and Optical Emissions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-2229