First Strong Constraints on the Long-Wavelength Color Evolution of an Early GRB Afterglow

Details First Strong Constraints on the Long-Wavelength Color Evolution of an Early GRB Afterglow First Strong Constraints on the Long-Wavelength Color Evolution of an Early GRB Afterglow

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...20925208p&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #252.08; Bulletin of the American Astronomical Society,

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Scientific paper

The robotic, fully-automated infrared telescope PAIRITEL began observations of GRB 061126 less than one minute after the burst trigger. The afterglow was well-detected in simultaneous J, H, and Ks imaging in individual 7.8 second exposures for more than 10 minutes, until the object faded below the detection threshold. Additional observations were acquired from the KAIT robotic telescope and other ground-based facilities, along with data from the Swift UVOT and XRT. The light curve decays throughout the observations as a broken power-law, with no evidence for large flares as seen in some other gamma-ray bursts. We constrain the possibility of color evolution and discuss implications for the nature of the energy release and environment of this GRB.

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