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GCN Circular 8160

SGR 0501+4516: Detection of possible optical counterpart
2008-08-29T11:49:38Z (16 years ago)
Alberto Castro-Tirado at Astro. de Andalucia <>
T. Fatkhullin (SAO-RAS Nizhnij Arkhyz), A. de Ugarte Postigo (ESO 
Santiago), A. J. Castro-Tirado, J. Gorosabel and M. Jel�nek (IAA-CSIC 
Granada), V. Sokolov (SAO-RAS), S. Guziy (Nikolaev State Univ.), A. 
Pozanenko (IKI-RAS Moscow), E. Sonbas (Cukurova Univ.) and D. 
P�rez-Ram�rez (U. Leicester), on behalf of a larger collaboration, report:

"Continuing with our monitoring campaign of the field of the SGR 
0501+4516 (Holland et al. GCNC 8112, Barthelmy et al. GCNC 8113) we have 
used the 6.0m BTA telescope (equipped with SCORPIO) at the Special 
Astrophysical Observatory (SAO, Russia). A combination of exposures 
adding a total of 1530s in the I-band obtained at a mean epoch of August 
25.18468 UT shows a low S/N source consistent with the NIR object 
reported by Tanvir and Varrycatt (GCN 8126), with a magnitude of I = 
23.3 � 0.4. Taking into account the nIR magnitude reported by Rea et al. 
at about the same epoch (GCNC 8159), we derive an apparent color index 
(I-Ks) = 4.1 � 0.6, uncorrected for Galactic extinction in the line of 
sight to the source. Further observations are planned."

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