X-ray brightening of V1716 Sco

ATel #16150; K. L. Page (U. Leicester)
on 25 Jul 2023; 13:36 UT
Credential Certification: Kim Page (kpa@star.le.ac.uk)

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The Neil Gehrels Swift Observatory has been monitoring V1716 Sco (PNV J17224490-4137160; Nova Sco 2023) since the day after its discovery by Pearce on 2023-April-20.678 UT (CBET #5245).

In ATel #16069 we reported the appearance of a new, weak soft X-ray component on 2023-05-31, on day 41 after the initial optical discovery. After this time, the X-ray count rate remained close to constant, around 0.037 +/- 0.003 count s^-1, until 2023-July-18. The next observation, on 21/22 July, showed a notably stronger soft component, with the X-ray count rate increasing to 0.46 +/- 0.02 count s^-1; on 24 July, this has increased further, to 1.59 +/- 0.06 count s^-1. All count rates are over 0.3-10 keV, and consider grade 0 (single pixel) events only. Using an atmosphere grid to approximate the temperature of the soft component, we find a consistent temperature for both of these most recent observations, with kT = (7.3 +0.1/-0.2)x10 K (63 +1/-2 eV).

Further monitoring by Swift is planned to follow this brightening component. We thank the Swift PI for approving these observations, and the Swift operations team for implementing them.