IGR J17091-3624 undergoes 'heartbeat' oscillations similar to those of GRS 1915+105
We report on the follow up observations after the report of ~10 mHz quasi-periodic oscillations (QPO -- ATel #3225) in the X-ray light curve of the ongoing...
We have identified IGR J17303-0601 (1RXS J173021.5-055933) as an intermediate polar (IP). The optical counterpart is USNOA2.0 0825_10606993 (RA=17h30m21.9s Dec=...
The INTEGRAL/EINSTEIN/ROSAT/NVSS objects IGR J17418-12122, 2E 1739.1-1210, 1RXS J174155.3-121157 and NVSS J174155-121201 have recently been suggested to be the...
Image quality and active optics for the Gran Telescopio Canarias
The conceptual design of the Gran Telescopio Canarias (GTC) has been completed. One of the challenges facing the GTC Project is to obtain excellent image...
A multi-mission image search tool has been created through a collaboration between Google and NASA Ames Research Center, using Google Earth as a virtual...
Image sharpening algorithm at low light level. On-line reduction.
The authors study the behaviour of a family of algorithms with different weight functions in an approach to algorithms working in real time. The behaviour of...