Journal
ASTRONOMY & ASTROPHYSICS
Volume 529, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201015324
Keywords
gamma-ray burst: individual: GRB 080928
Categories
Funding
- DFG [K1 766/11-3, K1 766/16-1, HA 1850/28-1]
- BLANCEFLOR Boncompagni-Ludovisi, nee Bildt foundation
- Thuringer Landessternwarte Tautenburg, Germany
- Icelandic Research Fund
- Science and Technology Facilities Council [ST/H00243X/1, PP/C002229/1, ST/H004157/1, ST/H004165/1] Funding Source: researchfish
- STFC [ST/H004157/1, ST/H004165/1, PP/C002229/1] Funding Source: UKRI
- Direct For Mathematical & Physical Scien
- Division Of Physics [801007] Funding Source: National Science Foundation
Ask authors/readers for more resources
We present the results of a comprehensive study of the gamma-ray burst 080928 and of its afterglow. GRB 080928 was a long burst detected by Swift/BAT and Fermi/GBM. It is one of the exceptional cases where optical emission had already been detected when the GRB itself was still radiating in the gamma-ray band. For nearly 100 s simultaneous optical, X-ray and gamma-ray data provide a coverage of the spectral energy distribution of the transient source from about 1 eV to 150 keV. In particular, we show that the SED during the main prompt emission phase agrees with synchrotron radiation. We constructed the optical/near-infrared light curve and the spectral energy distribution based on Swift/UVOT, ROTSE-IIIa (Australia), and GROND (La Silla) data and compared it to the X-ray light curve retrieved from the Swift/XRT repository. We show that its bumpy shape can be modeled by multiple energy-injections into the forward shock. Furthermore, we investigate whether the temporal and spectral evolution of the tail emission of the first strong flare seen in the early X-ray light curve can be explained by large-angle emission (LAE). We find that a nonstandard LAE model is required to explain the observations. Finally, we report on the results of our search for the GRB host galaxy, for which only a deep upper limit can be provided.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available