GRB 970228 and GRB 980329 and the Nature of Their Host Galaxie

Details GRB 970228 and GRB 980329 and the Nature of Their Host Galaxie GRB 970228 and GRB 980329 and the Nature of Their Host Galaxie

1999-09-01

arxiv.org/abs/astro-ph/9909027v1

Astronomy and Astrophysics

Astrophysics

Proceedings of Gamma-Ray Bursts in the Afterglow Era, Nov. 1998, Rome, F. Frontera & L. Piro eds., A&A Suppl. Ser., in press

Scientific paper

10.1051/aas:1999318

We find that the local galactic extinction towards the field of gamma-ray burst GRB970228 is $A_V=1.09^{+0.10}_{-0.20}$, which implies a substantial dimming and change in the spectral slope of the intrinsic GRB970228 afterglow. We measure a color $(V_{606}-I_{814})_{ST} = -0.18^{+0.51}_{-0.61}$ 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 (\cite{CL98}). 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 $A_V \ga 1$ mag), 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 $\approx$ 2 mag drop between the $R$ and the $I$ bands can be explained by the far-ultraviolet non-linear component of the extinction curve if $3 \la z \la 4$, and by the 2175 \AA\ bump if $z \approx 2$; other redshifts are not consistent with the observational data, given our general model.

Affiliated with

Also associated with

No associations

Rating

GRB 970228 and GRB 980329 and the Nature of Their Host Galaxie does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with GRB 970228 and GRB 980329 and the Nature of Their Host Galaxie, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and GRB 970228 and GRB 980329 and the Nature of Their Host Galaxie will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-506345