Astron. Astrophys. Suppl. Ser. 138, 437-438
L. Nicastro1 - L. Amati2 - L.A. Antonelli3,4 - E. Costa5 - G. Cusumano1 - M. Feroci5 - F. Frontera2,6 - E. Palazzi2 - E. Pian2 - L. Piro5
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1 - Istituto di Fisica Cosmica con Applicazioni all'Informatica, CNR, Via U. La Malfa 153, I-90146 Palermo, Italy
2 - Istituto Tecnologie e Studio Radiazione Extraterrestre, CNR, Via Gobetti 101, I-40129 Bologna, Italy
3 - Osservatorio Astronomico di Roma, Via Frascati 33, I-00040 Monteporzio Catone (RM), Italy
4 - BeppoSAX Scientific Data Center, Via Corcolle 19, I-00131 Roma, Italy
5 - Istituto Astrofisica Spaziale, CNR, Via Fosso del Cavaliere, I-00131 Roma, Italy
6 - Dipartimento di Fisica, Università di Ferrara, Via Paradiso 11, I-44100 Ferrara, Italy
Received December 29, 1998; accepted March 10, 1999
Over a total of 20 gamma-ray bursts localized with arcmin accuracies, GRB 980519 represents the 13 detected by the BeppoSAX Wide Field Cameras (WFCs). An X-ray TOO observation performed by the BeppoSAX Narrow Field Instruments (NFIs), starting about 9.5 hours after the high energy event, revealed X-ray afterglow emission in the 0.1-10 keV energy range. The flux decay was particularly fast with a power-law index of .This is the fastest decay so far measured. Signs of bursting activity are evident. The power-law spectral index of 2.8+0.6-0.5 is quite soft but not unique among GRB afterglows.
optical emission was detected as soon as 8 hours after the GRB and the power-law flux decay in all these bands were all consistent with . As for the X-ray, this is the fastest of all the 9 optically identified afterglows but GRB 980326. A candidate host galaxy with magnitude has been reported and variable radio emission detected.
Key words: gamma-rays: bursts -- gamma-rays: observation -- X-rays: bursts
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