Blog – Page 59 – Global SuperNovae Search Team

August 13, 2018

Observation: AT2018ehq

AT2018ehq, Type unknown
Discovered 2018-07-29.430 by ATLAS, mag 17.954 at discovery
R.A. = 20h14m02s.130, Decl. = +67°14’47”.54

Observer: Cedric Raguenaud, SW France
2018-07-30.972
Approx mag 17.75 ±0.02 (dmag 0.157mag on 10 reference stars from UCAC-4), ZP=29.621mag
0.25m/f4 + EQ8
QHY183C, 0.5″/pixel
4x300s, bin 1×1

August 13, 2018

Observation: AT2018dyx

AT2018dyx, Type unknown
Discovered 2018-07-15.503 by Gaia, mag 18.74 at discovery
R.A. = 21h09m23s.255, Decl. = +24°09’38”.88

Observer: Cedric Raguenaud, SW France
2018-07-30.944
Approx mag 19.81CV ±0.09 (dmag 0.091mag on 384 reference stars from UCAC-4), ZP=30.370mag
0.25m/f4 + EQ8
QHY183C, 0.5″/pixel
6x300s, bin 1×1

August 12, 2018

Possible discovery of a new Transient in LEDA 1537119

GSNST team member, Kendurkar. M reports a discovery of a possible new Astronomical Transient (AT) on 2018-08-09 in the galaxy LEDA 1537119 at magnitude 19.22 +/- 0.14.

August 10, 2018

Possible New Transient Discovery

Possible New Transient discovery by GSNST Team on 2018-08-09
Position RA = 12:51:27.908, Dec = -39:09:13.49.
Measured flux L = 19.59 +/- 0.81

August 9, 2018

Observation: 2018bsr

2018bsr, Type Ia in VII Zw 884
Discovered 2018-05-16.320 by All Sky Automated Survey for SuperNovae (ASAS-SN), mag 17.2 at discovery
R.A. = 19h27m38s.758, Decl. = +61°56’50”.07

Observer: Cedric Raguenaud, SW France
2018-07-31.065
Approx mag 16.78CV ±0.01 (dmag on 257 reference stars from UCAC-4), ZP=30.256mag
0.25m/f4, QHY183C, 0.5″/pixel
3x300s, bin 1×1

From previous observation, on 2018-07-17.896, magnitude was 16.77CV.

Note: magnitude has been stable for at least 2 weeks. The location is the core of the host galaxy but SIMBAD doesn’t provide magnitude for that galaxy. It’s therefore not possible to know when the SN magnitude falls below galaxy core’s magnitude. ASAS-SN reports a pre-discovery magnitude below limiting of 18.3 for galaxy core on 2018-05-07 08:09:36.