Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PSN J12060084+2036183

PSN J12060084+2036183   2015 04 25.19  *  12 06 00.84 +20 36 18.3  18.9 U   43W   4S  N4098     D 0

2015 04 26.153

PSN J12060084+2036183 = SNhunt287. This transient was confirmed on 2015 04 26.153 on stack of 84 x 20-second unfiltered exposures with Celestron 0.28m f/5 SCT and Orion StarShoot Deep-Space Mononchrome Imager III. The transient measured 18.7 +/- 0.1 with V as reference. Comparison stars are from SDSS whose g and r data were used to determine V. Image: https://www.flickr.com/photos/watchingthesky/16652205183. S. Howerton

2015 04 26.349

This probable supernova in NGC 4098 was detected with 3 x 10 min images using a clear filter Photometry: Mag 18.88 +/- 0.67 C (V for ref; USNOA2) Astrometry: RA 12 06 00.85 Dec +20 36 18.0 These data were collected remotely by Joseph Brimacombe, Coral Towers Observatory, Cairns, Australia. Link to image and further information: https://www.flickr.com/photos/43846774@N02/17282477782/

2015 04 28.94797

This transient was observed on 2015 04 28.94797 by G. Masi, remotely using the 17"-f/6.8 robotic unit part of the Virtual Telescope Project facility, at Bellatrix Astronomical Observatory in Ceccano, Italy. 120-seconds exposures, unfiltered, show the source at mag. 17.8 (R mags for the reference stars from UCAC-4). We also performed astrometry, getting the following end figures: 00.85; 17.8 (J2000.0, mean residuals of 0.1" on both axes).

2015 05 02.244

2015 05 02.244. Transient measured 17.6R +/- 0.4 under intense moonlight on 3 x 180-second filtered exposures with robotic telescope T21 (0.43-m f/6.8 astrograph + CCD + f/4.5 focal reducer) in Mayhill, NM. There is a correction on the time for my image on 2015 04 26 as it should be 2015 04 26.176 not 26.153. S. Howerton.