Discovery certificate for object 2015cw
TNS Astronomical Transient Report No. 35591 [ 2019TNSTR.827....1M ]

Date Received (UTC): 2019-05-22 07:12:07
Sender: Ms. Melina Thévenot
Source Group: None

Michael Mojstrovich, Ine Theunissen report/s the discovery of a new astronomical transient.

IAU Designation: AT 2015cw
Coordinates (J2000): RA = 11:53:22.008 (178.3417) DEC = -00:18:49.32 (-0.3137)
Discovery date: 2015-04-11 03:03:29 (JD=2457123.627419)

Potential host galaxy: 2MASX J11532200-0018507
Host redshift: 0.134287

Remarks: This transient was first discovered by Michael Mojstrovich on the galaxy zoo website, see discussion:


Discovery (first detection):
Discovery date: 2015-04-11 03:03:29
Flux: 19.93 ABMag
Filter: g-Sloan
Instrument: DECAM
Telescope: CTIO - 4-m Victor M. Blanco Telescope

Remarks: The Apparent Magnitude was calculated with APT by Melina Thévenot, using SDSS J115326.35-001813.2, see An Absolute Magnitude of -19.01 was also calculated. The transient also appears in HSC images at a later date (2015-05-19 Y-band, 2015-05-23 z-band), but it is very faint in these images and measuring the flux is difficult for these images.

Last non-detection:
Archival info: SDSS

Details of the new object can be viewed here: