ar X iv : a st ro - p h / 04 01 62 1 v 1 2 9 Ja n 20 04 Small - scale variations in the radiating surface of the GRB 011211 jet

/ 04 01 62 1 v 1 2 9 Ja n 20 04 Small - scale variations in the radiating surface of the GRB 011211 jet

We report the discovery of the afterglow of the X-ray rich, long-duration gamma-ray burst GRB 011211 and present evidence for oscillatory behaviour in its early optical light curve. The time-scale of the fluctuations, ∼1 hour, is much smaller than the time of the observations, ∼12 hours from the onset of the gamma-ray burst. The character and strength of the fluctuations are unprecedented and a...

ar X iv : a st ro - p h / 04 01 12 2 v 2 1 9 Ja n 20 04 High Energy Gamma - Ray Astronomy

The physics results of high energy γ-ray astronomy are reported, emphasizing recent achievements with ground-based detectors. This includes some of the instrumental developments and latest projects. The fundamental contribution of the field to the question of Cosmic Ray origin is highlighted.

ar X iv : a st ro - p h / 04 01 29 1 v 1 1 5 Ja n 20 04 INTEGRAL Spectrometer Analysis of GRB 030227 & GRB 030131

The spectrometer SPI on board INTEGRAL is capable of high-resolution spectroscopic studies in the energy range 20 keV to 8 MeV for GRBs which occur within the fully coded field of view (16 • corner to corner). Six GRBs occurred within the SPI field of view between October 2002 and November 2003. We present results of the analysis of the first two GRBs detected by SPI after the payload performan...

ar X iv : a st ro - p h / 04 06 56 7 v 1 2 4 Ju n 20 04 1

ar X iv : a st ro - p h / 97 01 22 8 v 1 2 9 Ja n 19 97 Large - scale Structures revealed by Wavelet Decomposition 1