PESSTO constraints on the explosion time of DLT16am (=AT2016ija)

ATel #9784; K. W. Smith (QUB), O. Rodriguez, K. Takats (MAS, UNAB), K. Maguire (QUB), J. Anderson (ESO), L. Galbany, C. Inserra (QUB), E. Kankare (QUB), S. J. Smartt (QUB), M. Sullivan (Southampton), S. Valenti (UC Davis), O. Yaron (Weizmann), D. Young (QUB), I. Manulis (Weizmann)
on 23 Nov 2016; 17:33 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ken Smith (k.w.smith@qub.ac.uk)

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The transient DLT16am (=AT2016ija) which was discovered by Tartaglia, Sand & Valenti (ATel #9782) on 2016 11 21.19 is in the nearby host galaxy NGC1532 which also hosted the recent supernova ATLAS16dvr (=SN2016aie) discovered on 2016 11 07.47 (Tonry et al. ATel 9754). If DLT16am is confirmed as a supernova, as seems likely from the rapid rise then there are two currently active supernovae in the same galaxy.

The new transient is 43.3 arcsec from SN2016iae. PESSTO (www.pessto.org) has been regularly observing the type Ic SN2016aie and three recent acquisition images with the NTT help constrain the explosion epoch of the new transient AT2016ija. The DLT detection is likely within 24-48hrs of explosion. All images were with the V-band EFOSC2 filter

2016 11 18.26 V>21 no detection
2016 11 19.26 V>21 no detection
2016 11 20.10 V ~ 21 (marginal detection)
2016 11 21.10 V= 20.4 +/- 0.2
2016 11 21.19 R=20.1 DLT discovery (Tartaglia et al. Atel #9782)
2016 11 22.04 R=18.6 (Tartaglia et al. Atel #9782)
2016 11 23.17 R=18.3 (Tartaglia et al. Atel #9782)