出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present our successful program using Chandra for identifying the X-ray afterglow with subarcsecond accuracy for the short GRB 111117A discovered by Swift and Fermi. Thanks to our rapid target of opportunity request, Chandra clearly detected the X-ray afterglow, whereas no optical afterglow was found in deep optical observations. Instead, we clearly detect the host galaxy in optical and also in near-infrared bands. We found that the best fit photometric redshift of the host is z = 1.31+0.46 −0.23 (90% confidence), making it one of the highest redshift short GRBs. Furthermore, we see an offset of 1.0±0.2 arcseconds, which corresponds to 8.4±1.7 kpc assuming z=1.31, between the host and the afterglow position. We discuss the importance of using Chandra for obtaining sub-arcsecond localization of the afterglow in X-rays for short GRBs to study GRB environments in great detail.
