Query : 1999A&AS..138..479L

1999A&AS..138..479L - Astron. Astrophys., Suppl. Ser., 138, 479-480 (1999/September-0)

GRB 970228 and GRB 980329 and the nature of their host galaxies.


Abstract (from CDS):

We find that the local galactic extinction towards the field of gamma-ray burst GRB 970228 is AV=1.09+0.10–0.20, which implies a substantial dimming and change in the spectral slope of the intrinsic GRB 970228 afterglow. We measure a color (V606-I814)ST=-0.18+0.51–0.61 for the extended source coincident with the afterglow. Taking into account our measurement of the extinction toward this field, this color implies that the extended source is most likely a galaxy undergoing star formation, in agreement with our earlier conclusion (Castander & Lamb 1998). In a separate analysis, we find that the inferred intrinsic spectrum of the GRB 980329 afterglow is consistent with the predictions of the simplest relativistic fireball model. We also find that the intrinsic spectrum of the afterglow is extincted both by dust (source frame AV>1mag), and that the shape of the extinction curve is typical of young star-forming regions like the Orion Nebula but is not typical of older star-forming or starburst regions. The ≃2mag drop between the R and the I bands can be explained by the far-ultraviolet non-linear component of the extinction curve if 3≲z≲4, and by the 2175Å bump if z≃2; other redshifts are not consistent with the observational data, given our general model.

Abstract Copyright:

Journal keyword(s): gamma-rays: bursts

Simbad objects: 2

goto Full paper

goto View the references in ADS

Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 GRB 970228 gB 05 01 46.7 +11 46 53           ~ 634 1
2 GRB 980329 gB 07 02 41 +38 50.7           ~ 269 1

To bookmark this query, right click on this link: simbad:objects in 1999A&AS..138..479L and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact