Free Access
Astron. Astrophys. Suppl. Ser.
Volume 138, Number 3, September 1999
Gamma-Ray Bursts in the Afterglow Era Contents Rome, November 3-6, 1998
Page(s) 447 - 448
Published online 15 September 1999
DOI: 10.1051/aas:1999302

Astron. Astrophys. Suppl. Ser. 138, 447-448

The X-ray, optical and infrared counterpart to GRB 980703

P.M. Vreeswijk1 - T.J. Galama1 - A.N. Owens2 - T. Oosterbroek2 - T. Geballe3 - J. van Paradijs1,4 - C. Kouveliotou5,6 - N. Tanvir7 - E. Pian8 - E. Palazzi8 - F. Frontera8 - N. Masetti8

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 December 29, 1998; accepted March 10, 1999


We report on X-ray, optical and infrared follow-up observations of GRB980703. We detect a previously unknown X-ray source in the GRB error box; assuming a power law decline we find for its decay index $\alpha <-0.91
(3\sigma )$. 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: $\nu_{\rm c}\gt 1.3\ 10^{17}$ Hz. For this epoch we obtain an extinction of $A_V=1.50 \pm 0.11$.From the X-ray data we estimate the optical extinction to be AV = 20.2+12.3-7.3, inconsistent with the former value. Following [#!wij98!#, Wijers & Galama (1998)], we determine intrinsic fireball properties for this burst.

Key words: gamma-rays: bursts -- radiation mechanisms: non-thermal

Copyright The European Southern Observatory (ESO)

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