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ePESSTO spectra and ATLAS photometry of SN2017iuk associated with GRB171205A

ATel #11060; S. Prentice, P. Mazzali (LVJMU), S. J. Smartt (QUB), C. R. Angus, R. E. Firth (Southampton), C. Frohmaier (Portsmouth), M. Smith, C. Barbarino (Stockholm), J. Anderson (ESO), M. Dennefeld (IAP/UMPC), C. Inserra (Southampton), E. Kankare (QUB), K. Maguire (QUB), S. J. Smartt (QUB), K. W. Smith (QUB), M. Sullivan (Southampton), S. Valenti (UC Davis), O. Yaron (Weizmann), D. Young (QUB), I. Manulis (Weizmann) J. Tonry, L. Denneau, B. Stalder, A. Heinze, H. Weiland (IfA, University of Hawaii), A. Rest (STScI), M. Fulton (QUB), O. McBrien (QUB)
on 15 Dec 2017; 10:54 UT
Credential Certification: Stephen Smartt (s.smartt@qub.ac.uk)

Subjects: Optical, Gamma Ray, Gamma-Ray Burst, Supernovae, Transient

ePESSTO, the extended Public ESO Spectroscopic Survey of Transient Objects, (see Smartt et al. 2015, A&A, 579, 40 http://www.pessto.org ), reports further spectral observations of SN 2017iuk, associated with GRB 171205A.

Initial observations were made on the night of 2017-12-12 and 2017-12-13 using EFOSC2 on the New Technology Telescope at La Silla, and grisms Gr11 (3380-7520 A, resolution 16 A) and Gr16 (6015-10320 A, resolution 16 A). Data have been collected nightly, and are ongoing.

Further to de Ugarte Postigo et al. (GCN 22204), we confirm that a broad lined type Ic SN spectrum has clearly emerged at +7 and +8 days after the GRB (likely to be around -7 days before peak).

The spectra are characterised by broad absorption features and re-emission peaks between 3600-3800 A, 4300-4500 A, 5000-5200 A, and 8200-9200 A. The re-emission peak at 5000 A changes from a sharp and well defined peak in the 2017-12-12 spectrum to a rounder broader peak a day later. There is no indication of the re-emission peak 6000 A, and consequently the Si II 6355 absorption line, that is seen in other GRB-SNe at similar epochs. Further dense monitoring is encouraged, and will be undertaken nightly during ePESSTO scheduled time.

The most recent photometry from ATLAS (from template subtracted frames) is o = 18.5 +/- 0.1 (AB mag) on 2017-12-13.6