Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J18425840+0958555

TCP J18425840+0958555   2023 07 21.3051*  18 42 58.40 +09 58 55.5  15.0 C             Oph       0 0

2023 07 21.3051

Discovered by B.Kumar (Golden Ears Observatory Transient Survey - GEOTS) at Golden Ears Observatory, Maple Ridge, BC, Canada, in three 30-second unfiltered exposures using a 0.36-m f/2 Schmidt-Cassegrain + CCD, with magnitude 15.0 under limiting magnitude 18.0. Nothing is visible at this position on archival images taken on 2023 July 14.4011 UT (limiting mag 18.0). Discovery and Reference images can be found here:https://www.wis-tns.org/system/files/uploaded/GEOTS/tns_2023npl_atrep_182907_GEOTS.png

2023 07 22.3118

Follow-up observations from Golden Ears Observatory shows that this transient is brightening (mag 14.6 measured at the following epoch: July 22.3118). This transient was also detected in recent ASAS-SN images. https://asas-sn.osu.edu/sky-patrol/coordinate/d6f1a8af-7621-4d1b-8b45-9568e011a6f5

2023 07 22.5424

Position end figures 58s.42, 55".3 measured with 0.35m R-COP reflector + CCD at Perth Observatory, W. Australia. J2000, Gaia DR2 positions. There's no obvious progenitor at this location in Gaia and Pan-STARRS PS1 survey catalogues. Possible faint progenitor visible on Pan-STARRS color image, however this is uncertain. Photometry using R-COP as follows: July 22.542 UT V = 15.15. Andrew Pearce, Nedlands, W. Australia.