ASAS-SN Prediscovery Limits for SPIRITS16tn
ATel #9446; B. J. Shappee (Hubble Fellow, Carnegie Observatories), K. Z. Stanek, C. S. Kochanek, T .W.-S. Holoien (Ohio State), J. L. Prieto (Diego Portales; MAS)
on 1 Sep 2016; 19:46 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Benjamin Shappee (bshappee@obs.carnegiescience.edu)
Subjects: Optical, Supernovae
Following the discovery of SPIRITS16tn (ATel #9434), a possible supernova discovered with Spitzer in Messier 108 (NGC 3556), we analyzed prediscovery ASAS-SN data at its reported location. SPIRITS16tn was not detected in images obtained on UT 2016-06-10.262 and before. Our prediscovery limits are as follows:
JD UT Date V-Band Limit
2457524.797 2016-05-16.297 >17.59
2457528.782 2016-05-20.282 >17.22
2457532.810 2016-05-24.311 >17.48
2457537.789 2016-05-29.289 >17.93
2457542.779 2016-06-03.279 >17.76
2457545.792 2016-06-06.292 >17.80
2457547.758 2016-06-08.258 >17.85
2457549.762 2016-06-10.262 >17.81
It is currently not clear if these limits constrain the explosion date because SPIRITS16tn is likely heavily extinguished (ATel #9441).
We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported by NSF grant AST-1515927, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, the Mt. Cuba Astronomical Foundation, George Skestos, and the Robert Martin Ayers Sciences Fund. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.
