Early Observations of the Possible Supernova in NGC 6908, PSN J20250386-2449133
ATel #6666; D. Sand, A. Corsi (Texas Tech), P. Brown (Texas A&M), D. Reichart, J. Haislip (UNC)
on 4 Nov 2014; 22:41 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: David Sand (dave.j.sand@gmail.com)
Subjects: Optical, Supernovae
We report early, pre-discovery imaging of the PSN in NGC 6908 (PSN
J20250386-2449133) discovered by KAIT (Atel #6659) utilizing a PROMPT
0.41m telescope located at CTIO. We report detections
of the PSN on October 28.10 (UT) with R~18.9+/-0.2 mag and Oct 31.12
(UT) with R~16.8+/-0.1 mag. Note the October 28 detection is earlier
than the initial KAIT detection on October 29.131 (UT). There is no
detection on Oct 25.05 (UT) down to a limiting magnitude of R~19. All
images were taken in a 'Clear' filter which was calibrated to an
approximate R-band magnitude using the USNO-B1 catalog, and standard
star fields.
This data was collected as part of the software commissioning phase of
the D<40 Mpc Survey (DLT40). DLT40 is a one-day cadence, pointed
search for supernovae in the nearby universe (D<40 Mpc), utilizing a
nearly dedicated PROMPT 0.41m telescope. The ultimate goal is to find
~10 supernovae per year within one day of explosion, and to have
same-night photometric and spectroscopic followup. The survey is in
an initial software commissioning phase, but once fully operational
all supernova discoveries will be made available to the community
immediately.
