An accurate position of a new nearby ULX in NGC 4945
Abstract
On February 8th, we discovered a new ULX in the galaxy NGC 4945 (http://www.astronomerstelegram.org/?read=14380). The new ULX was detected serendipitously in a Swift/XRT observation of the galaxy, and no X-ray source has been reported at or near this position before despite numerous previous Swift, Chandra, XMM-Newton, and NuSTAR observations. We have continued to follow the source with Swift, finding that the source continues to be active, and here we request to follow up with a Chandra observation. The Chandra data will provide an accurate position of the source, which will in turn allow a search for a potential optical counterpart. We already have a candidate counterpart in the 2.7" Swift positional error circle, but Chandra is needed to confirm this. We request a 10-ks exposure, which is required to detect enough X-ray sources in the field of view to carry out the astrometric correction.
- Publication:
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Chandra Proposal
- Pub Date:
- March 2020
- Bibcode:
- 2020cxo..prop.6029B
- Keywords:
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- Chandra Proposal ID #22408769