Difference between revisions of "Triggers:GRBs"
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[[File:GRB-fraction.png|300px]] from [http://prola.aps.org/abstract/RMP/v76/i4/p1143_1 Piran,2005] | [[File:GRB-fraction.png|300px]] from [http://prola.aps.org/abstract/RMP/v76/i4/p1143_1 Piran,2005] | ||
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| + | Color-color (B-V vs. V-R) diagram of optical afterglows of long GRBs. The color indices were corrected for the Galactic reddening. Multiple indices of the same optical afterglow are connected by lines for convenience. Optical afterglows of the ensemble (Simon , Sim04} are denoted by open red circles. The mean colors (centroid) of the whole ensemble, including the standard deviations, are marked by the large cross. The outlying optical afterglow of GRB 060218 (closed blue circles) is not included in the calculation of the centroid. The representative reddening paths for E(B-V) = 0.5 mag are shown. Adapted from Simon et al. (2001, 2004), where a detailed information can be found. | ||
Revision as of 09:44, 8 December 2009
Very short-lived optical transients associated with enormous gamma-ray outbursts. A catalogue of GRBs is available here. Comprehensive recent review on GRBs and their physics can be found in Piran,2005
- time-scales from seconds to minutes
- in maximum can reach up to few mag, but the whole range observed
- host galaxy can be visible
from Wozniak et al. 2006
Detecting GRBs with Gaia
About 5% of GRBs is detectable by Gaia, with the highest efficiency close to the nodes. The main feature visible in the data is steady and rapid decline over AF CCDs. Time sampling at AF CCDs level is 4.4s per CCD. We also demand the transient to be visible in the second FOV (after 105 min).
from Piran,2005
Color-color (B-V vs. V-R) diagram of optical afterglows of long GRBs. The color indices were corrected for the Galactic reddening. Multiple indices of the same optical afterglow are connected by lines for convenience. Optical afterglows of the ensemble (Simon , Sim04} are denoted by open red circles. The mean colors (centroid) of the whole ensemble, including the standard deviations, are marked by the large cross. The outlying optical afterglow of GRB 060218 (closed blue circles) is not included in the calculation of the centroid. The representative reddening paths for E(B-V) = 0.5 mag are shown. Adapted from Simon et al. (2001, 2004), where a detailed information can be found.
