GCN Circular 18824
Subject
LIGO/Virgo G211117: Summary of Pan-STARRS transients
Event
Date
2016-01-04T17:12:47Z (10 years ago)
From
S. J. Smartt at Queens U Belfast <s.smartt@qub.ac.uk>
S. Smartt ((Queen���s University Belfast), K. C. Chambers, (IfA, University of Hawaii),
T.-W. Chen (MPE),K. Smith, D. Wright (QUB) , M. E. Huber, A. S. B. Schultz (IfA),
M. Coughlin (Harvard), L. Denneau, H. Flewelling, A. Heinze, R. Kotak (QUB),
E. A. Magnier, N. Primak, A. Rest (STScI), A. Sherstyuk (IfA), B. Stalder (IfA),
C. W. Stubbs (Harvard), J. Tonry, C. Waters (IfA), D. Young (QUB)
Further to Smith et al. (GCN 18811), Chambers et al. (18786), Frohmaier et al. (18806)
we report three further spectra from Gemini and a full summary of targets from all
spectra, cross-matching and Pan-STARRS data now available. Targets are
summarised as likely extragalactic transients, stellar variables, and AGN/QSO variables below.
Three targets were observed with Gemini GMOS (GN-2015B-Q-4, PI. K. Chambers),
with the R400 grating (4900-8000Angs) on 2016-01-01
PS15don is a type Ia, z=0.16, at peak,
PS15doy is a type Ia, z=0.19, probably 1991T-like at one weak post peak
PS15dpe is a type Ia, z=0.057 at about 10 days after peak.
Hence all of these exploded well before G211117, and as apparently normal Ia SNe
are unrelated.
The only unusual target to date is PS15dpn (see Chambers et al. GCN 18811).
Summary table of extragalactic transients (30) :
Name RA (J2000) Dec (J2000) Disc. Date Disc. MJD Disc Mag
PS15dcq 03 22 55.83 +34 59 23.6 20151228.29 57384.29 19.99 (1) iPTF15fgy, SN Ia
PS15dov 03 43 57.36 +39 17 43.7 20151228.32 57384.32 19.73 SN II, GMOS
PS15dot 02 11 55.69 +13 28 17.8 20151228.34 57384.34 20.97 SN II, GMOS
PS15coh 02 15 58.45 +12 14 13.6 20151228.34 57384.34 17.72 (2) ASASSN-15rw (SN Ia)
PS15dow 02 19 42.20 +14 09 54.7 20151228.34 57384.34 20.22 SN Ib, GMOS
PS15csf 02 26 02.24 +17 03 40.4 20151228.35 57384.35 18.68 (2) MASTER OT J022037.36+170217.5, LSQ15bwe (old)
PS15dom 02 34 45.62 +18 20 37.7 20151228.35 57384.35 19.01 (2) PSNJ02344555+1820390, iPTF15fdv (old)
PS15don 02 37 11.44 +19 03 20.2 20151228.35 57384.35 20.47 SN Ia, GMOS
PS15dox 02 40 15.05 +22 32 12.1 20151228.38 57384.38 19.23 SN Ia, PESSTO
PS15doy 02 47 54.16 +21 46 24.0 20151228.38 57384.38 20.75 SN Ia, GMOS
PS15dpq 03 09 12.74 +27 31 16.9 20151228.39 57384.39 18.84 SN Ia, PESSTO (iPTF15fel)
PS15dpa 02 57 56.02 +28 53 37.1 20151228.40 57384.40 19.51 SN Ia, PESSTO
PS15dpe 05 44 42.66 +52 24 57.9 20151228.43 57384.43 19.44 SN Ia, GMOS
PS15dpl 05 47 45.39 +53 36 32.4 20151228.43 57384.43 19.34 SN Ia GMOS
PS15dpn 02 32 59.75 +18 38 07.0 20151229.23 57385.23 20.69 see GCN 18811
PS15dpf 02 49 32.57 +21 47 09.4 20151229.24 57385.24 20.69
PS15doz 02 53 41.68 +27 29 57.8 20151229.25 57385.25 20.69
PS15dpc 03 55 46.16 +38 52 49.6 20151229.27 57385.27 20.95 SN II, GMOS
PS15dqc 05 51 13.43 +52 28 18.7 20151229.29 57385.29 21.16
PS15cvo 02 20 37.39 +17 02 17.9 20151229.31 57385.31 20.45 (2) MASTER and PSST detections in Nov 2015
PS15dpz 02 40 33.01 +23 00 10.8 20151229.32 57385.32 21.15
PS15dpb 03 42 23.40 +39 14 40.4 20151229.36 57385.36 20.20 SN II, GMOS
PS15dou 06 03 38.73 +54 41 12.1 20151229.56 57385.56 20.20
PS15dpx 06 04 35.54 +53 35 25.8 20151229.56 57385.56 20.76
PS15dpt 02 07 34.96 +11 03 25.2 20151230.22 57386.22 20.64
PS15dpy 02 28 22.75 +13 59 19.3 20151230.22 57386.22 21.31
PS15dpu 02 40 41.35 +16 49 52.0 20151230.22 57386.22 17.26 ASASSN-15un (3), spectrum scheduled on LT
PS15dqa 02 59 41.20 +25 14 12.2 20151230.24 57386.24 20.93 in NGC1156 at 7Mpc (GCN18811)
PS15dqe 06 05 26.88 +54 09 11.3 20151230.37 57386.37 21.51
PS16bp 03 05 29.46 +24 46 05.0 20160102.39 57389.39 17.45 spectrum scheduled on LT
Notes
(1) Old SN from PSST (GCN. 18811) Observed by Copperwheat et al. (GCN18807), type Ia at 16d after peak.
(2) Old SNe known before G211118
(3) ASASSN-15un : discovered on 2015-12-28.22 by Masi et al. (ATel 8470)
not yet classified. In Mrk 1182, d=119 Mpc. Spectrum now scheduled on LT.
On closer inspection of multi-epoch Pan-STARRS data and the reference images,
we find that the following previously reported transients from Smith et al. (GCN18786)
are most likely not extragalactic transients : one is a slow mover (not a recorded minor planet)
and 12 are most likely faint stellar variables (including 2 already report as stellar in GCN 18786)
Slow mover :
PS15dpr 03 16 12.16 +31 04 01.3 20151229.46 57385.46 19.78
Likely stellar variables : these objects either are close to the Galactic plane
(l,b coordinates given below), and/or do not have detections spanning multiple
nights.
Name RA (J2000) Dec (J2000) Disc. Date Disc. MJD Disc Mag l b
PS15dpm 06 19 54.15 +54 18 10.3 20151229.56 57385.56 20.48 160.2 17.4
PS15dpv 03 40 02.91 +36 07 52.2 20151230.43 57386.43 20.93 157.1 -15.3
PS15dps 03 22 31.49 +34 36 36.6 20151229.43 57385.43 20.41 155.1 -18.6
PS15dpk 05 09 35.10 +50 09 08.7 20151229.38 57385.38 19.66 158.5 6.0
PS15dpj 05 08 12.38 +51 37 10.2 20151228.44 57384.44 18.45 157.2 6.7
PS15dpd 05 09 58.63 +50 47 09.4 20151228.44 57384.44 20.34 158.0 6.4
PS15dpw 04 10 16.52 +43 35 22.8 20151230.27 57386.27 19.29 156.7 -5.9
PS15dpg 03 17 18.88 +32 20 06.9 20151229.41 57385.41 20.86 155.5 -21.1
PS15dph 03 24 15.04 +30 56 20.1 20151229.46 57385.46 20.17 157.7 -21.4
PS15dpi 03 36 41.65 +35 57 56.4 20151228.52 57384.52 17.62 RR Lyrae; CSS J033641.5+355756
PS15dpp 03 00 39.86 +28 15 25.4 20151228.40 57384.40 20.63 154.7 -26.5
PS15dqb 03 28 34.85 +31 59 08.2 20151230.43 57386.43 19.93 157.8 -20.0
The following two transients are probable faint AGN/QSO (as previously reported in
Smith et al. GCN 18786)
PS15dop 03 17 29.58 +29 34 09.2 20151228.40 57384.40 20.01 probable AGN
PS15dpo 02 59 49.56 +25 10 30.4 20151229.25 57385.25 20.55 probable AGN/QSO