Astron. Astrophys. Suppl. Ser.
Volume 138, Number 3, September 1999Gamma-Ray Bursts in the Afterglow Era Contents Rome, November 3-6, 1998
|Page(s)||437 - 438|
|Published online||15 September 1999|
The X-ray afterglow of GRB 980519
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
Accepted: 10 March 1999
Over a total of 20 gamma-ray bursts localized with arcmin accuracies, GRB 980519 represents the 13th 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 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
© European Southern Observatory (ESO), 1999