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Optical measurements of HETE J1900.1-2455 with the Large Binocular Telescope

ATEL # 1110; Peter Garnavich (Department of Physics, University of Notre Dame), Paul Callanan, Patrick Elebert and Mark Reynolds (Department of Physics, University College Cork)
on 14 Jun 2007; 21:41 UT
Password Certification: Paul Callanan (

Subjects: Optical, Binaries, Neutron Stars

We acquired a series of 200 s r-band images of the optical counterpart of HETE J1900.1-2455 beginning 2007 June 13 09:37 UT with the Large Binocular Camera (Blue), mounted on the 8.4 m Large Binocular Telescope, Mt. Graham, Arizona. PSF photometry yielded a Sloan R-band magnitude of 18.64 +/- 0.02, or 18.54 +/- 0.02 mag in Johnson-Cousins R-band. This is consistent with previous reports that the X-ray flux has increased again (Degenaar et al. 2007, ATel #1106), and that the object has returned (more or less) to its outburst state. In the R-band, it is currently ~1.7 mag brighter than the measurements from 2 weeks ago (Torres et al. 2007, ATel #1090), and only ~0.5 mag fainter than its previous outburst magnitude (Steeghs et al. 2005, ATel #543).

The LBT is an international collaboration among institutions in the United States, Italy and Germany. The LBT Corporation partners are: * The University of Arizona on behalf of the Arizona university system * Istituto Nazionale di Astrofisica, Italy * LBT Beteiligungsgesellschaft, Germany, representing the Max Planck Society, the Astrophysical Institute Potsdam, and Heidelberg University * The Ohio State University * The Research Corporation, on behalf of The University of Notre Dame, University of Minnesota and University of Virginia

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