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Late-Time X-ray Flares during GRB Afterglows: Extended Internal Engine Activity
A. D. Falcone, D. N. Burrows, P. Romano +21
Observations of gamma ray bursts (GRBs) with Swift produced the initially surprising result that many bursts have large X-ray flares superimposed on the underlying afterglow. These…
The classification of BL Lacertae objects: the Ca H&K break
H. Landt, P. Padovani, P. Giommi
We investigate why BL Lacertae objects (BL Lacs) have values of the Ca H&K break (a stellar absorption feature) lower than low-power radio galaxies and if its use is justified to s…
The BeppoSAX High Energy Large Area Survey -V. The nature of the hard X-ray source populations and its evolution
F. La Franca, F. Fiore, C. Vignali +7
We present optical spectroscopic identifications of hard X-ray (5-10 keV) selected sources belonging to the HELLAS sample obtained with BeppoSAX down to a 5-10 keV flux limit of f_…
BeppoSAX Observations of 1 Jy BL Lacertae Objects. I
P. Padovani, L. Costamante, P. Giommi +6
We present new BeppoSAX observations of seven BL Lacertae objects selected from the 1 Jy sample plus one additional source. The collected data cover the energy range 0.1 - 10 keV (…
The Deep X-ray Radio Blazar Survey (DXRBS). II. New Identifications
H. Landt, P. Padovani, E. Perlman +3
We have searched the archived, pointed ROSAT Position Sensitive Proportional Counter data for blazars by correlating the WGACAT X-ray database with several publicly available radio…
BeppoSAX Observations of Markarian 501 in June 1999
E. Pian, L. Chiappetti, P. Giommi +19
We present the preliminary results of a long BeppoSAX observation of the BL Lac object Mkn501 carried out in June 1999. The source was fainter than found during the BeppoSAX pointi…
BeppoSAX spectrum of GRB971214: evidence of a substantial energy output during afterglow
D. Dal Fiume, L. Amati, L. A. Antonelli +18
We report the X/gamma-ray spectrum of GRB971214 and of its afterglow. The afterglow was measured few hours after the main event and for an elapsed time of more than two days. The m…
Spectral Evolution of PKS 2155-304 observed with BeppoSAX during an Active Gamma-ray Phase
L. Chiappetti, L. Maraschi, F. Tavecchio +9
We present the results of BeppoSAX observations of PKS 2155-304 during an intense gamma-ray flare. The source was in a high X-ray state. A temporal analysis of the data reveals a t…
The viscous disk of GRS 1915+105
T. Belloni, M. Mendez, A. R. King +2
GRS 1915+105, one of the two known galactic microquasars, shows an extremely complex variability in the X-ray band, comparable to no other X-ray source in the sky. Making use of RX…
Initial Results from the High Energy Experiment PDS aboard BeppoSAX
F. Frontera, D. Dal Fiume, E. Costa +6
The high energy experiment PDS is one of the Narrow Field Instruments aboard the X-ray astronomy satellite BeppoSAX. It covers the energy band from 15 to 300 keV. Here we report re…
Discovery of the X-Ray Afterglow of the Gamma-Ray Burst of February 28 1997
E. Costa, F. Frontera, J. Heise +23
Here we report the discovery in the X-ray band of the first afterglow of a gamma-ray burst. It was detected and quickly positioned by the Beppo-SAX satellite on 1997 February 28 (G…