Probing the Circumburst Environment & Jet of GRB 091018A : Modeling the Synchrotron Peak - Cooling Break Cross Over

Details Probing the Circumburst Environment & Jet of GRB 091018A : Modeling the Synchrotron Peak - Cooling Break Cross Over Probing the Circumburst Environment & Jet of GRB 091018A : Modeling the Synchrotron Peak - Cooling Break Cross Over

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21944209o&link_type=abstract

American Astronomical Society, AAS Meeting #219, #442.09

Astronomy and Astrophysics

Astronomy

Scientific paper

We focus on continuing the modeling of Gamma-ray Burst (GRB) 091018. Our data is mostly collected across 4 bands (BVRI) from PROMPT (Panchromatic Robotic Optical Monitoring and Polarimetry Telescopes) approximately 4.1 hours after the trigger. We have added NIR, UVOT, X-ray, and more optical points to our datasets. Our baseline fit has accurately modeled the shocks in the jet, attributed to either energy injection or density variation. After rejecting the original assertion of dust evolution in the early BVRI bands by linking extinction parameters with Galapagos (a software that employs genetic algorithms to output the best fit model with our circumburst GRB parameters), we have settled on a model with the circumburst density index k at -2.87 which suggests a wind-blown medium of k=-2. In addition to k, the results of our baseline fit indicate that we have localized the cooling break - synchrotron peak crossover during early UVOT times. This cross-over will yield interesting physical information about the circumburst medium and jet of the GRB at early times. With the unique linking capability in Galapagos, we have furthered our analysis to test variance in our k value across time slices. The host galaxy will be modeled after observation using the 9.2 m telescope SALT. We acknowledge and appreciate the support of the NASA Space Grant and NSF to carry out this research.

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