SCP16L01: discovery of an unusual transient in MOO-J1142

ATel #9125; Kyle Boone (UC Berkeley), Greg Aldering (LBNL), Rahman Amanullah (Stockholm), Kyle Barbary (LBNL), Hans Boehringer (MPI), Mark Brodwin (Missouri - Kansas City), Carlos Cunha (Stanford), Susana E. Deustua (STSCI), Sam Dixon (UC Berkeley), Peter Eisenhardt (JPL), Rene Fassbender (INAF, OA Roma), Andrew S. Fruchter (STSCI), Michael Gladders (Chicago), Anthony H. Gonzalez (Florida), Ariel Goobar (Stockholm), Brian Hayden (LBNL), Hendrik Hildebrandt (Bonn, Argelander), Matt Hilton (KwaZulu-Natal), Henk Hoekstra (Leiden), Isobel Hook (Lancaster), Xiaosheng Huang (UC Berkeley), Dragan Huterer (Michigan), Myungkook J. Jee (UC Davis), Alex G. Kim (LBNL), Marek Kowalski (Humboldt), Chris Lidman (AAO), Eric Linder (LBNL), Kyle Luther (UC Berkeley), Joshua Meyers (Stanford), Adam Muzzin (Cambridge), Jakob Nordin (Humboldt), Reynald Pain (LPNHE), Saul Perlmutter (UC Berkeley), Johan Richard (CRAL), Piero Rosati (Ferrara), Eduardo Rozo (Stanford), David Rubin (STSCI), Eli S. Rykoff (Stanford), Joana S. Santos (OA Arcetri), Clare M. Saunders (UC Berkeley), Caroline Sofiatti (UC Berkeley), Anthony L. Spadafora (LBNL), Spencer Adam Stanford (UC Davis), Daniel Stern (JPL), Nao Suzuki (IPMU), Tracy Webb (McGill), Risa H. Wechsler (Stanford), Steven C. Williams (Lancaster), Jon Willis (Victoria), Gillian Wilson (UC Riverside), Michael Yen (UC Berkeley)
on 8 Jun 2016; 02:13 UT
Credential Certification: Kyle Boone (kboone@berkeley.edu)

Tweet

We report the discovery of an unusual transient found while monitoring the galaxy cluster MOO-J1142 (z = 1.19) for type Ia supernovae. This transient (named SCP16L01) was discovered with cadenced observations from the Hubble Space Telescope (HST) using the Wide Field Camera 3 (WFC3) instrument as part of the See Change program (HST GO: 13677, 14327; PI: Perlmutter). The transient was discovered on March 10th, 2016 with imaging in the F814W, F105W and F140W filters, with a brightness of 25.47 +/- 0.09 mag AB in the F105W filter.

Additional imaging was taken on both April 14th, 2016 and May 15th, 2016. The transient declined rapidly in the F814W (e-folding time of 21 observer days), while simultaneously brightening by a factor of 1.7 in F140W over the 67 observer days between the first and last observations. The AB magnitudes in each of the filters measured using forward modeling photometry are shown in the following table:

A machine readable table, cutouts, and plots of the lightcurve can be found at http://supernova.lbl.gov/seechange/SCP16L01/. There is no host detected in the reference images, with 3-sigma limiting magnitudes of 26.5, 27.7 and 27.7 for the F814W, F105W and F140W filters respectively. The redshift of SCP16L01 is not known, and we do not know where it is relative to the cluster. The transient is 0.6 arcminutes from the core of the cluster. The J2000 coordinates for SCP16L01 are 11:42:44.88 +15:27:51.72.

The See Change collaboration has no cadenced visits remaining on this field. Additional external observations are encouraged, but they will be very challenging.

Additional data for SCP16L01