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2013ApJ...766...41S - Astrophys. J., 766, 41 (2013/March-3)

Identifying the location in the host galaxy of the short GRB 111117A with the Chandra subarcsecond position.

SAKAMOTO T., TROJA E., AOKI K., GUIRIEC S., IM M., LELOUDAS G., MALESANI D., MELANDRI A., DE UGARTE POSTIGO A., URATA Y., XU D., D'AVANZO P., GOROSABEL J., JEON Y., SANCHEZ-RAMIREZ R., ANDERSEN M.I., BAI J., BARTHELMY S.D., BRIGGS M.S., FOLEY S., FRUCHTER A.S., FYNBO J.P.U., GEHRELS N., HUANG K., JANG M., KAWAI N., KORHONEN H., MAO J., NORRIS J.P., PREECE R.D., RACUSIN J.L., THONE C.C., VIDA K. and ZHAO X.

Abstract (from CDS):

We present our successful Chandra program designed to identify, with subarcsecond 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+0.46–0.23 (90% confidence), making it one of the highest known short gamma-ray burst (GRB) redshifts. Furthermore, we see an offset of 1.0±0.2 arcsec, which corresponds to 8.4±1.7 kpc, between the host and the afterglow position. We discuss the importance of using Chandra for obtaining subarcsecond X-ray localizations of short GRB afterglows to study GRB environments.

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Journal keyword(s): gamma-ray burst: individual: GRB 111117A

Simbad objects: 36

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