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Discovery of a Transient Absorption Edge in the X-ray Spectrum of GRB 990705
L. Amati, F. Frontera, M. Vietri +18
We report the discovery of a transient equivalent hydrogen column density with an absorption edge at ~3.8 kiloelectron volts in the spectrum of the prompt x-ray emission of gamma-r…
Observation of X-ray lines from a Gamma-Ray Burst (GRB991216): Evidence of Moving Ejecta from the Progenitor
L. Piro, G. Garmire, M. Garcia +18
We report on the discovery of two emission features observed in the X-ray spectrum of the afterglow of the gamma-ray burst (GRB) of 16 Dec. 1999 by the Chandra X-Ray Observatory. T…
The Giant Flare of 1998 August 27 from SGR 1900+14: I. An Interpretive Study of BeppoSAX and Ulysses Observations
M. Feroci, K. Hurley, R. Duncan +1
The giant flare of 1998 August 27 from SGR 1900+14 was extraordinary in many ways: it was the most intense flux of gamma rays ever detected from a source outside our solar system;…
Discovery of a redshifted Iron K-line in the X-ray afterglow of GRB 000214
L. A. Antonelli, L. Piro, M. Vietri +13
We report the detection (3 sigma significance level) of a strong iron emission line in the X-ray spectrum of the afterglow of GRB 000214 (``Valentine's Day Burst'') observed by Bep…
X-ray afterglow detection of the short gamma-ray burst 991014
J. J. M. in 't Zand, L. Kuiper, L. Amati +14
GRB 991014 is one of the shortest gamma-ray bursts detected so far with the Wide Field Cameras aboard BeppoSAX, both in gamma-rays and X-rays. The duration is 9.6 sec in 2-28 keV a…
BeppoSAX Observations of the Soft Gamma-Ray Repeater SGR 1806-20
S. Mereghetti, D. Cremonesi, M. Feroci +1
We have observed with the BeppoSAX satellite the quiescent counterpart of the Soft Gamma-ray Repeater SGR 1806-20. Observations performed in October 1998 and in March 1999 showed t…