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ATEL # 2818; J. M. Corral-Santana (IAC/ULL), P. Rodríguez-Gil (ING, IAC, ULL), J. C. Guerra (ING), J. Casares (IAC, ULL)
on 28 Aug 2010; 18:19 UT
Password Certification: P. Rodriguez-Gil (email@example.com)
Subjects: Optical, Binaries, Black Holes, Transients
We observed the black hole candidate XTE J1752-223 (ATel #2258) with the William Herschel Telescope (WHT) and the ACAM imager/spectrograph at the Observatorio del Roque de los Muchachos, La Palma, Spain.
200-s exposures were taken in the R and I bands under photometric conditions and 0.6-0.7-arcsec seeing on Aug 24.887 and Aug 24.893, respectively. The object has dropped substantially since the optical re-brightening reported in ATel #2805. Due to the good seeing conditions we are able to resolve the target from its nearby star and obtain a magnitude limit I >= 18.7, which is consistent with the i' >= 18.9 limit from Russell et al. (ATel #2775). Some residual flux is also seen at the position of the counterpart in the R-band image but an upper limit could not be derived.
R- and I-band images of XTE J1752-223: http://www.iac.es/project/binariasrayosx/jcorral/XTEJ1752-223_2.html
Previous R- and I- band images during the optical re-brightening: http://www.iac.es/project/binariasrayosx/jcorral/XTEJ1752-223.html