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arXiv · 1205.6774

Identifying the Location in the Host Galaxy of the Short GRB 111117A with the Chandra Sub-arcsecond Position

T. Sakamoto·E. Troja·K. Aoki·S. Guiriec·M. Im·G. Leloudas·D. Malesani·A. Melandri·A. de Ugarte Postigo·Y. Urata·D. Xu·P. D'Avanzo·J. Gorosabel·Y. Jeon·R. Sanchez-Ramirez·M. I. Andersen·J. Bai·S. D. Barthelmy·M. S. Briggs·S. Foley·A. S. Fruchter·J. P. U. Fynbo·N. Gehrels·K. Huang·M. Jang·N. Kawai·H. Korhonen·J. Mao·J. P. Norris·R. D. Preece·J. L. Racusin·C. C. Thone·K. Vida·X. Zhao
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Abstract

We present our successful Chandra program designed to identify, with sub-arcsecond accuracy, the X-ray afterglow of the short GRB 111117A, which was discovered by Swift and Fermi. Thanks to our rapid target of opportunity request, Chandra clearly detected the X-ray afterglow, though no optical afterglow was found in deep optical observations. The host galaxy was clearly detected in the optical and near-infrared band, with the best photometric redshift of z=1.31_{-0.23}^{+0.46} (90% confidence), making it one of the highest known short GRB redshifts. Furthermore, we see an offset of 1.0 +- 0.2 arcseconds, which corresponds to 8.4 +- 1.7 kpc, between the host and the afterglow position. We discuss the importance of using Chandra for obtaining sub-arcsecond X-ray localizations of short GRB afterglows to study GRB environments.

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T. Sakamoto, E. Troja, K. Aoki, S. Guiriec, M. Im, G. Leloudas, D. Malesani, A. Melandri, A. de Ugarte Postigo, Y. Urata, D. Xu, P. D'Avanzo, J. Gorosabel, Y. Jeon, R. Sanchez-Ramirez, M. I. Andersen, J. Bai, S. D. Barthelmy, M. S. Briggs, S. Foley, A. S. Fruchter, J. P. U. Fynbo, N. Gehrels, K. Huang, M. Jang, N. Kawai, H. Korhonen, J. Mao, J. P. Norris, R. D. Preece, J. L. Racusin, C. C. Thone, K. Vida, X. Zhao. 2012-05-30. Identifying the Location in the Host Galaxy of the Short GRB 111117A with the Chandra Sub-arcsecond Position. https://doi.org/10.1088/0004-637x/766/1/41

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