A refined position catalogue of the Swift XRT afterglows

被引：39

作者：

Moretti, A

Perri, M

Capalbi, M

Angelini, L

Hill, JE

Campana, S

Burrows, DN

Osborne, JP

Tagliaferri, G

Cusumano, G

Giommi, P

Romano, P

Mineo, T

Kennea, J

Morris, D

Nousek, J

Pagani, C

Racusin, J

Abbey, AF

Beardmore, AP

Godet, O

Goad, MR

Page, KL

Wells, AA

Chincarini, G

机构：

[1] Osserv Astron Brera, INAF, I-23807 Merate, LC, Italy

[2] ASI Sci Data Ctr, I-00044 Frascati, Italy

[3] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[4] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[5] Univ Space Res Assoc, Columbia, MD 21044 USA

[6] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[7] Univ Leicester, Dept Phys & Astron, Xray Observat Astron Grp, Leicester LE1 7RH, Leics, England

[8] Inst Astrofis Spaziale & Fis Cosmica Sez Palermo, INAF, I-90146 Palermo, Italy

[9] Univ Milano Bicocca, Dipartimento Fis, I-20126 Milan, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2006年 / 448卷 / 02期

关键词：

D O I：

10.1051/0004-6361:200600007

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a catalogue of refined positions of 68 gamma ray burst (GRB) afterglows observed by the Swift X-ray Telescope (XRT) from the launch up to 2005 Oct. 16. This is a result of the refinement of the XRT boresight calibration. We tested this correction by means of a systematic study of a large sample of X-ray sources observed by XRT with well established optical counterparts. We found that we can reduce the systematic error radius of the measurements by a factor of two, from 6.5 '' to 3.2 '' (90% of confidence). We corrected all the positions of the afterglows observed by XRT in the first 11 months of the Swift mission. This is particularly important for the 37 X-ray afterglows without optical counterpart. Optical follow-up of dark GRBs, in fact, will be more efficient with the use of the more accurate XRT positions.

引用

页码：L9 / U13

页数：6

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