Study of the colors of GRBs and their host galaxies

Details Study of the colors of GRBs and their host galaxies Study of the colors of GRBs and their host galaxies

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.459..441s&link_type=abstract

In: Exploring the gamma-ray universe. Proceedings of the Fourth INTEGRAL Workshop, 4-8 September 2000, Alicante, Spain. Editor:

Computer Science

2

Gamma-Ray Bursts, Host Galaxies

Scientific paper

We show that the color variations of the optical afterglows (OAs) of GRBs during the decline are relatively small and allow a comparison among them, especially for t-T0 < 10 days. The colors in the observer's frame, corrected for the Galactic reddening, concentrate at (V-R)0 = 0.39+/-0.12, (R-I)0 = 0.42+/-0.15, (B-V)0 = 0.45+/-0.18 and suggest that both the slope of the spectrum and the intrinsic reddening must be quite similar for all OAs. Most host galaxies lie within z = 0.43 to 1.6. The absolute brightnesses of the host galaxies in the observer's frame range from MR0 = -21.5 to -17.7. (R-I)0 tends to decrease towards the more luminous galaxies while (B-V)0 does not change significantly for largely different MR0 of the galaxies with similar z.

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