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) | 447 - 448 | |
DOI | https://doi.org/10.1051/aas:1999302 | |
Published online | 15 September 1999 |
The X-ray, optical and infrared counterpart to GRB 980703
1
Astronomical Institute "Anton Pannekoek”, University of Amsterdam, & Center for High Energy Astrophysics, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
2
Astrophysics Division, Space Science Department of ESA, European Space Research and Technology Centre, 2200 AG Noordwijk, The Netherlands
3
Joint Astronomy Centre, 660 N. A'ohoku Place, Hilo, Hawaii 9672 0, U.S.A.
4
Physics Department, University of Alabama in Huntsville, Huntsville AL 35899, U.S.A.
5
Universities Space Research Association
6
NASA/MSFC, Code ES-84, Huntsville AL 35812, U.S.A.
7
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
8
Istituto Tecnologie e Studio Radiazioni Extraterrestri (TESRE), CNR, Via P. Gobetti 101, 40 129 Bologna, Italy
Received:
29
December
1998
Accepted:
10
March
1999
We report on X-ray, optical and infrared follow-up observations of
GRB 980703. We detect a previously unknown X-ray source in the GRB error box;
assuming a power law decline we find for its decay index . We invoke host galaxy extinction to match the observed spectral slope
with the slope expected from "fireball” models.
We find no evidence for a spectral break in the infrared to X-ray spectral
range on 1998 July 4.4, and determine a lower limit of the cooling break
frequency:
Hz. For this epoch we obtain
an extinction of
.
From
the X-ray data we estimate the optical extinction to be
AV =
, inconsistent with the former value. Following Wijers & Galama (1998), we determine intrinsic fireball properties
for this burst.
Key words: gamma-rays: bursts / radiation mechanisms: non-thermal
© European Southern Observatory (ESO), 1999