Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J18595064+0605336

TCP J18595064+0605336   2024 03 26.7381*  18 59 50.64 +06 05 33.6  11.2  U            Aql       3 1

2024 03 26.7349

Discovered by Seiji Ueda, Kushiro, Hokkaido, Japan, on six frames (mag=11.2, limiting mag 13.1, 6-s exp.) using Canon EOS 6D digital camera + 200-mm F/3.2 lens. On 2024 Mar. 26.7705 UT, mag=13.6 (limiting mag 14.7, 7-s exp.), position end figures 50.63s, 35.5" using 0.25-m F/6.3 Schmidt Cassegrain reflector + Nikon D5000 digital camera. Nothing is visible at this location on the frames taken on 2024 Mar. 25.7730 UT (limiting mag.= 12.9). --- Seiichiro Naito and Isao Endoh (NAOJ)

2024 03 25.9646

The object was fainter than the unfiltered magnitude CV=13.0 at the NMW ( https://scan.sai.msu.ru/nmw/ ) images obtained on 2024-03-25.9646 UT, 0.77 days prior to discovery. The reported position of the transient coincides with a red dwarf star Gaia DR3 4282562266517007104 (Gmag= 14.47, Plx= 13.356 +/-0.037 mas.) and the X-ray source 1RXS J185950.5+060545 suggesting the event might have been a chromospheric flare on the previously unknown UV Ceti type variable. ---- Stanislav Korotkiy (Astroverty, Ka-Dar), Kirill Sokolovsky (UIUC, SAI MSU), Nikolay Potapov, Sergei Ostapenko

2024 03 26.8278

Yuji Nakamura, Kameyama, Mie, Japan reported to NAOJ. Nothing is visible at this location on 2024 Mar. 26.8278 UT (6-s exp. limiting mag 13.0) using 135-mm F/4.0 lens + unfiltered CMOS camera. --- Isao Endoh (NAOJ)