Issue |
Astron. Astrophys. Suppl. Ser.
Volume 138, Number 3, September 1999
Gamma-Ray Bursts in the Afterglow Era Contents Rome, November 3-6, 1998
|
|
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Page(s) | 463 - 464 | |
DOI | https://doi.org/10.1051/aas:1999310 | |
Published online | 15 September 1999 |
BeppoSAX detection and follow-up of GRB 980425
1
Istituto Te.S.R.E., CNR, via Gobetti 101, I-40129 Bologna, Italy
2
Osservatorio Astronomico di Roma, sede di Monteporzio Catone, Via Frascati 33, 00040 Monteporzio Catone, Italy
3
Agenzia Spaziale Italiana, Viale Regina Margherita 120, Roma, Italy
4
I.A.S., C.N.R., Via Fosso del Cavaliere, Area della Ricerca di Tor Vergata, I-00131 Rome, Italy
5
I.F.C.A.I., CNR, via Ugo La Malfa 153, I-90146 Palermo, Italy
6
Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, I-34131 Trieste, Italy
7
BeppoSAX Scientific Data Center, Via Corcolle 19, I-00131 Rome, Italy
8
Dip. di Fisica, Univ. di Ferrara, Via Paradiso 11, I-44100 Ferrara, Italy
9
Astrophysics Division, SSD of ESA, ESTEC, P.O. Box 299, 2200 AG Noordwijk, The Netherlands
10
IAA-CSIC, Granada, Spain and LAEFF-INTA, Madrid, Spain
11
Space Research Organization Netherlands, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
Received:
16
March
1999
Accepted:
5
July
1999
We present BeppoSAX GRBM and WFC light curves of GRB 980425 and
NFI follow-up data
taken in 1998 April, May, and November. The first NFI observation has
detected within the radius error box of the GRB an
X-ray source positionally consistent with the supernova SN 1998bw,
exploded within a day of GRB 980425, and a fainter X-ray source, not
consistent with the position of the supernova. The former source is
detected in the following NFI pointings and exhibits a decline of a
factor of two in six months. If it is associated with SN 1998bw, this
is the first detection of hard X-ray emission from a Type I
supernova.
The latter source exhibits only marginally significant variability.
Based on these data, it is not possible to select either
source as a firm candidate for the GRB counterpart.
Key words: gamma-rays: bursts
© European Southern Observatory (ESO), 1999