Optical upper-limit of the ULX candidate Swift J004327.6+410452
Abstract
We have obtained optical imaging of the field of the ULX candidate in M31 (ATEL #5743,#5752). The image was taken on 10:11:48(UT) on 13 Jan. 2014. We used the 1.5-m "Kanata" telescope of Hiroshima University. The exposure time was 300 sec. The seeing size was about 2.4". We removed the contamination of the nearby star 2MASS J00432709+4104521 by fitting PSF and subtracting it. As a result, no clear optical counterpart brighter than Rc=19.4 can be seen at the position of the X-ray source reported in ATEL #5752.
- Publication:
-
The Astronomer's Telegram
- Pub Date:
- January 2014
- Bibcode:
- 2014ATel.5771....1U
- Keywords:
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- Optical;
- Black Hole;
- Transient