Discovery certificate for object 2013jw
TNS Astronomical Transient Report No. 18972 [ 2018TNSTR.722....1M ]

Date Received (UTC): 2018-05-30 14:20:10
Sender: Mr. Richard Nowell
Source Group: None

W. Meeussen, R. Nowell, C. Macmillan, A. Jonkeren report/s the discovery of a new astronomical transient.

IAU Designation: AT 2013jw
Coordinates (J2000): RA = 08:07:32.400 (121.885) DEC = +05:32:03.12 (5.5342)
Discovery date: 2013-01-04 07:11:07 (JD=2456296.7993866)

Potential host galaxy: SDSS J080731.98+053203.1
Host redshift: 0.031

Remarks: This transient was first noticed on the Galaxy Zoo website in a discussion begun by participant Wouter Meeussen. Other participants were: Richard Nowell, ChristineM, A.F. Jonkeren . The link to the discussion is: https://www.zooniverse.org/projects/zookeeper/galaxy-zoo/talk/subjects/20285037 . The link to the DECaLS browser where the object is visible is: http://legacysurvey.org/viewer?ra=121.8850&dec=5.5342&zoom=15&layer=decals-dr5 . Host galaxy SDSS J080731.98+053203.1 link is: http://skyserver.sdss.org/dr14/en/tools/explore/Summary.aspx?id=1237661064940945793

Photometry

Discovery (first detection):
Discovery date: 2013-01-04 07:11:07
Flux: 19.07 ABMag
Filter: R-Cousins
Instrument: DECAM
Telescope: CTIO - 4-m Victor M. Blanco Telescope

Remarks: The magnitude value was calculated using APT and r-band values. A reference star was used: SDSS J080732.42+053238.0 http://skyserver.sdss.org/dr14/en/tools/explore/Summary.aspx?id=1237661064940946153 . The flux values obtained using APT are: 13209 (star) and 17998 (transient). The original r-band DECaLS photometric value is 19.41. The photometric value given by DECaLS for the transient is 19.09 but I have chosen to use the value I calculated with reference to the star SDSS J080732.42+053238.0, which is 19.07, as above.

Last non-detection:
Archival info: SDSS
Remarks: There is no DECaLS image before January 2013 that I can find.

Details of the new object can be viewed here: https://wis-tns.weizmann.ac.il/object/2013jw