New X-ray transient Swift J162315.0-175233: a possible counterpart to Fermi J1623-1752
Abstract
Following the announcement by Fermi-LAT of a new gamma-ray source Fermi J1623-1752 (Rani et al., ATel #14939), with an error region encompassing the recurrent nova U Sco, Swift performed a ~5 ks Target of Opportunity observation of the field of U Sco between 2021 September 28 20:40 UT and September 29 03:17 UT. No X-ray source is detected at the location of U Sco by the XRT, to a 3-sigma upper limit of 2.2x10-3 count s-1. The UVOT measures magnitudes of u = 18.95 +/- 0.25, uvw1 = 19.60 +/- 0.32, uvm2 = 19.81 +/- 0.18 and uvw2 = 19.36 +/- 0.30.
- Publication:
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The Astronomer's Telegram
- Pub Date:
- September 2021
- Bibcode:
- 2021ATel14945....1P
- Keywords:
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- Transient