[vsnet-grb-info 6551] SGR 0501+4516: WHT observations of the possible near-infrared counterpart

Fri Aug 29 19:35:09 JST 2008

TITLE:   GCN CIRCULAR
NUMBER:  8159
SUBJECT: SGR 0501+4516: WHT observations of the possible near-infrared counterpart
DATE:    08/08/29 10:34:57 GMT
FROM:    Nanda Rea at U of Amsterdam  <nrea at science.uva.nl>

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N. Rea (U. Amsterdam), E. Rol (U. Leicester), P.A. Curran (U. =
Amsterdam), I. Skillen (Isaac Newton Group), D.M. Russell (U. =
Amsterdam), G.L. Israel (INAF) on behalf of a larger collaboration

On 2008 August 25 we observed the new Soft Gamma-ray Repeater SGR =
0501+4516 with LIRIS, the near-infrared imager on the William Herschel =
Telescope (WHT) in La Palma. The observations were performed in the Ks =
band with a total exposure time of 1.8 hours.=20

We clearly detect one object within the refined XRT error circle (GCN =
8148), at the position:

05:01:06.74  +45:16:34.1 (J2000)

with an uncertainty of 0.25 arcseconds (with respect to 2MASS =
astrometry). This is consistent with being the UKIRT suggested nIR =
counterpart (GCN 8126). We find the object at a magnitude of 19.2+/-0.2 =
(with respect to 2MASS calibration), slightly fainter than the UKIRT =
detection. We plan to take further observations from WHT in a few days =
to confirm this very tentative nIR variability.

We wish to thank Chris Benn and Rene Rutten for promptly approving our =
Target of Opportunity request.

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N. Rea (U. Amsterdam), E. Rol (U. Leicester), P.A. =
Curran (U. Amsterdam), I. Skillen (Isaac Newton Group), D.M. Russell (U. =
Amsterdam), G.L. Israel (INAF) on behalf of a larger collaboration 
 
 
On 2008 August 25 we observed the new Soft Gamma-ray Repeater SGR =
0501+4516 with LIRIS, the near-infrared imager on the William Herschel =
Telescope (WHT) in La Palma. The observations were performed in the Ks =
band with a total exposure time of 1.8 hours. 
 
We clearly detect one object within the refined XRT error circle (GCN =
8148), at the position: 
 
05:01:06.74&nbsp; +45:16:34.1 (J2000) 
 
with an uncertainty of 0.25 arcseconds (with respect to 2MASS =
astrometry). This is consistent with being the UKIRT suggested nIR =
counterpart (GCN 8126). We find the object at a magnitude of 19.2+/-0.2 =
(with respect to 2MASS calibration), slightly fainter than the UKIRT =
detection. We plan to take further observations from WHT in a few days =
to confirm this very tentative nIR variability. 
 
We wish to thank Chris Benn and Rene Rutten for promptly approving our =
Target of Opportunity request.

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