Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J17490276-2324066

TCP J17490276-2324066   2024 07 20.4552*  17 49 02.76 -23 24 06.6  11.0 U             Sgr       I 0

2024 07 20.476

Mag=10.6 http://k-itagaki.jp/images/sgr-2024-0720.jpg

2024 07 20.5495

Photometry results were B=13.02, V=11.38, Ic=9.25. position end figures 02s.74, 05".5 using 0.20-m f/8 Ritchey-Chretien + CMOS + f/5.4 focal Reducer; P87 Hirao Observatory. An image at http://orange.zero.jp/k-yoshimoto/TCP-J17490276-2324066_20240720.jpg observed by K. Yoshimoto, Yamaguchi, Japan,

2024 07 20.747

Position end figures 02s.73, 5.5" measured with 0.10m f/5 refractor + CCD at Skygems Observatory, Namibia. J2000, Gaia DR2 positions. Transient position within 0.3" of Gaia 4068578577794283776 (magnitude 20.8 G). Photometry - magnitude 10.9 unfiltered. Andrew Pearce, Nedlands, Western Australia

2024 07 16.495

Transient not visible on patrol image taken on July 16.495 UT down to a limiting magnitude of 11.8 with an 85mm f/1.2 lens. ATel 16727 reports the transient was detected by the ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) as ASASSN-24fb on July 17.05 UT at V magnitude 12.43, thus constraining the time of outburst. Andrew Pearce, Nedlands, W. Australia.

2024 07 20.4779

Y. Nakamura, Mie, Japan, reports (on July 20.588 UT) his detection of this object (mag about 11.3) on the images taken with f.l. 135-mm F4.0 lens + chilled CMOS camera. It was dimmer than mag 13.0 on the images taken on July 12.6184 UT with the same instruments. H. Yamaoka (NAOJ)