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

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

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..138..447v&link_type=abstract

Astronomy and Astrophysics Supplement, v.138, p.447-448

Astronomy and Astrophysics

Astrophysics

3

Gamma-Rays: Bursts, Radiation Mechanisms: Non-Thermal

Scientific paper

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 alpha <-0.91 (3sigma ). 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_c >1.3\ 10(17) Hz. For this epoch we obtain an extinction of A_V=1.50 +/- 0.11. From the X-ray data we estimate the optical extinction to be A_V = \gpm{20.2}{12.3}{7.3}, inconsistent with the former value. Following \cite[Wijers & Galama (1998)]{wij98}, we determine intrinsic fireball properties for this burst.

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