Discovery certificate for object 2017htp
TNS Astronomical Transient Report No. 14429 [ 2017TNSTR1207....1P ]

Date Received (UTC): 2017-11-03 18:03:54
Sender: Daniele Malesani
Source Group: STARGATE

Antonio de Ugarte Postigo (HETH/IAA-CSIC), Jonatan Selsing (DARK/NBI), Daniele Malesani (DARK/NBI) report/s the discovery of a new astronomical transient.

IAU Designation: SN 2017htp
Discoverer internal name: GRB171010A SN
Coordinates (J2000): RA = 04:26:19.460 (66.581083) DEC = -10:27:45.90 (-10.46275)
Discovery date: 2017-11-01 06:00:00 (JD=2458058.75)

Potential host galaxy: PSOJ042619.553-102745.801
Host redshift: 0.328

Remarks: Optical counterpart of the long GRB 171010A (detected by Fermi GBM and LAT on 2017 October 10 at 19:00:50.58 UT; Omodei et al., GCN 21985). The optical afterglow was initially discovered by Thorstensen & Halpern (GCN 21897) on 2017 October 11 at 08:31 UT. Spectroscopic signatures of the associated SN were discovered by our group on 2017 November 1.

Photometry

Discovery (first detection):
Discovery date: 2017-11-01 06:00:00
Flux: 21.8 VegaMag
Filter: R-Cousins
Instrument: VIMOS
Telescope: The Very Large Telescope - UT3

Remarks: This photometry is probably heavily contaminated by the host (maybe 50/50); subtraction not possible at the present time.

Last non-detection:
Archival info: Other
Remarks: Host galaxy detected in the Pan-STARRS survey.

Details of the new object can be viewed here: https://wis-tns.weizmann.ac.il/object/2017htp