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BeppoSAX Observations of the BL Lac Object Mkn 501 in an Intermediate State
Elena Pian, Eliana Palazzi, Lucio Chiappetti +8
The BL Lac object Mkn 501 was observed with the BeppoSAX satellite at three epochs in April-May 1998, simultaneously with the Whipple and HEGRA Cherenkov telescopes. The X-ray spec…
The absorption properties of gamma-ray burst afterglows measured by BeppoSAX
Alan Owens, M. Guainazzi, T. Oosterbroek +14
We present an analysis of the X-ray absorption properties of 6 gamma-ray burst (GRB) afterglows measured with BeppoSAX. Between 8 hrs and 20 hrs after the initial GRB trigger, indi…
An optical study of the GRB 970111 field beginning 19 hours after the Gamma-Ray Burst
J. Gorosabel, A. J. Castro-Tirado, C. Wolf +13
We present the results of the monitoring of the GRB 970111 field that started 19 hours after the event. This observation represents the fastest ground-based follow-up performed for…
Properties of the host galaxy of the gamma-ray burst 970508 and local star-forming galaxies
V. V. Sokolov, S. V. Zharikov, Yu. V. Baryshev +5
Late-time observations of GRB970508 with the SAO-RAS 6-m telescope in July-August 1998 show that the optical transient (OT) varies very little since November 1997. Here we report t…
Spectroscopy of the Host Galaxy of the Gamma--Ray Burst 980703
S. G. Djorgovski, S. R. Kulkarni, J. S. Bloom +4
We present spectroscopic observations of the host galaxy of the gamma-ray burst (GRB) 980703. Several emission and absorption features are detected, making the redshift, z = 0.966,…
Gamma-Ray Burst 980329 and its X-Ray Afterglow
J. J. M. in 't Zand, L. Amati, L. A. Antonelli +16
GRB 980329 is the brightest gamma-ray burst detected so far with the Wide Field Cameras aboard BeppoSAX, both in gamma-rays and X-rays. With respect to its fluence (2.6 X 10**-5 er…
The Fading Optical Counterpart of GRB~970228, Six Months and One Year Later
A. S. Fruchter, E. Pian, S. E. Thorsett +20
We report on observations of the fading optical counterpart of the gamma-ray burst GRB 970228, made with the Hubble Space Telescope STIS CCD approximately six months after outburst…
The Rapid Decay of the Optical Emission from GRB 980326 and its Possible Implications
Paul J. Groot, Titus J. Galama, Paul M. Vreeswijk
We report the discovery of the optical counterpart to GRB 980326. Its rapid optical decay can be characterized by a power law with exponent -2.10 +/- 0.13 and a constant underlying…
A `Hypernova' model for SN 1998bw associated with gamma-ray burst of 25 April 1998
K. Iwamoto, P. A. Mazzali, K. Nomoto +24
The discovery of the peculiar supernova (SN) 1998bw and its possible association with the gamma-ray burst (GRB) 980425 provide new clues to the understanding of the explo…
High Energy Properties of X-ray Sources observed with BeppoSAX
F. Frontera, D. Dal Fiume, G. Malaguti +6
We report on highlight results on celestial sources observed in the high energy band (>20 keV) with BeppoSAX. In particular we review the spectral properties of sources that belong…
HST/STIS Observations of the Optical Counterpart to GRB 970228
Andrew S. Fruchter, Elena Pian, Stephen E. Thorsett +14
We report on observations of the fading optical counterpart of the gamma-ray burst GRB 970228, made on 4~September~1997 using the STIS CCD on the Hubble Space Telescope. The unreso…
BeppoSAX detection of the Fe K line in the starburst galaxy NGC253
S. Mariani, M. Cappi, M. Persic +12
Preliminary results obtained from BeppoSAX observation of the starburst galaxy NGC253 are presented. X-ray emission from the object is clearly extended but most of the emission is…