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GCN Circular 18786

Subject
LIGO/Virgo G211117: 44 transients from Pan-STARRS data during 2015-12-28/30
Date
2015-12-31T17:38:41Z (9 years ago)
From
S. J. Smartt at Queens U Belfast <s.smartt@qub.ac.uk>
K. Smith, S. Smartt D. Wright, (Queen���s University Belfast), K. C. Chambers,
M. E. Huber, A. S. B. Schultz (IfA, University of Hawaii), 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)


Following our report of Pan-STARRS observations of the northern arc,
(Chambers et al. GCN 18735), we report the following transients. All objects
were identified in difference imaging with respect to the Pan-STARRS
3Pi all sky i-band image (see Magnier et al. 2013, ApJS 205, 20 ;
Huber et al. 2015,  ATel 7153) and standard filtering procedures combined with
machine learning (Wright et al. 2015, MNRAS, 449, 451). We have removed obvious
moving objects, variable star and AGN/QSO candidates as far as possible through
cross-matching with known catalogues and the MPC. Further refined cross-matches are noted
below. The rest are transients which are not obviously associated with a single
star or a galaxy core. 

All magnitudes are in the Pan-STARRS i-band (AB mags), and the discovery
date is UTC. Targets are sorted by time of discovery.  Approximately 10-15
of the brighter targets are queued for observing with Gemini, Magellan, PESSTO,
and the Liverpool Telescope. Pan-STARRS has observed the field
as noted in (Chambers et al. GCN 18735) on three nights from
(20151228, 20151229, 20151230) and plans another 5 epochs between
now and 2016 01 25.

Some more specific notes 

(1)  this was reported as iPTF15fgy Cenko et al. (GCN 18762)
but we have a detection 24 days previously on 57360 by PSST (Huber et al. 2015).
(2) discovered as PSNJ02344555+1820390 before the G211117 trigger
(3) Lipunov et al.  (GCN 18768) report iPTF15fel as being visible in MASTER
images more than 40 days before the G211117 trigger
(4) Faint transient, or more likely variable, in NGC1156 which is a very nearby
galaxy (7Mpc). At M_i = -9, this is most likely an LBV or S-Doradus type variability
of a massive star and indeed the candidate is coincident with a bright, stellar
knot.

We welcome notification of other cross-matches that we may have omitted, or
duplications that we may have missed.

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
PS15dov     03 43 57.36  +39 17 43.7  20151228.32  57384.32    19.73 4.2��� from SN2003ih
PS15dot     02 11 55.69  +13 28 17.8  20151228.34  57384.34    20.97
PS15coh     02 15 58.45  +12 14 13.6  20151228.34  57384.34    17.72 ASASSN-15rw, iPTF15fev
PS15dow     02 19 42.20  +14 09 54.7  20151228.34  57384.34    20.22
PS15csf     02 26 02.24  +17 03 40.4  20151228.35  57384.35    18.68 MASTER OT J022037.36+170217.5
PS15dom     02 34 45.62  +18 20 37.7  20151228.35  57384.35    19.01 (2) PSNJ02344555+1820390, iPTF15fdv
PS15don     02 37 11.44  +19 03 20.2  20151228.35  57384.35    20.47
PS15dox     02 40 15.05  +22 32 12.1  20151228.38  57384.38    19.23
PS15doy     02 47 54.16  +21 46 24.0  20151228.38  57384.38    20.75
PS15dpq     03 09 12.74  +27 31 16.9  20151228.39  57384.39    18.84 (3) iPTF15fel
PS15dpa     02 57 56.02  +28 53 37.1  20151228.40  57384.40    19.51
PS15dpp     03 00 39.86  +28 15 25.4  20151228.40  57384.40    20.63 likely stellar
PS15dop     03 17 29.58  +29 34 09.2  20151228.40  57384.40    20.01 probable AGN
PS15dpe     05 44 42.66  +52 24 57.9  20151228.43  57384.43    19.44
PS15dpl     05 47 45.39  +53 36 32.4  20151228.43  57384.43    19.34
PS15dpj     05 08 12.38  +51 37 10.2  20151228.44  57384.44    18.45
PS15dpd     05 09 58.63  +50 47 09.4  20151228.44  57384.44    20.34
PS15dpi     03 36 41.65  +35 57 56.4  20151228.52  57384.52    17.62 RR Lyrae; CSS J033641.5+355756
PS15dpn     02 32 59.75  +18 38 07.0  20151229.23  57385.23    20.69
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
PS15dpo     02 59 49.56  +25 10 30.4  20151229.25  57385.25    20.55 probable AGN/QSO
PS15dpc     03 55 46.16  +38 52 49.6  20151229.27  57385.27    20.95
PS15dqc     05 51 13.43  +52 28 18.7  20151229.29  57385.29    21.16
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
PS15dpk     05 09 35.10  +50 09 08.7  20151229.38  57385.38    19.66
PS15dpg     03 17 18.88  +32 20 06.9  20151229.41  57385.41    20.86
PS15dps     03 22 31.49  +34 36 36.6  20151229.43  57385.43    20.41
PS15dpr     03 16 12.16  +31 04 01.3  20151229.46  57385.46    19.78
PS15dph     03 24 15.04  +30 56 20.1  20151229.46  57385.46    20.17
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
PS15dpm     06 19 54.15  +54 18 10.3  20151229.56  57385.56    20.48
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
PS15dqa     02 59 41.20  +25 14 12.2  20151230.24  57386.24    20.93 (4) in NGC1156 (7Mpc)
PS15dpw     04 10 16.52  +43 35 22.8  20151230.27  57386.27    19.29
PS15dqd     05 56 14.60  +52 51 55.2  20151230.37  57386.37    19.92
PS15dqe     06 05 26.88  +54 09 11.3  20151230.37  57386.37    21.51
PS15dqb     03 28 34.85  +31 59 08.2  20151230.43  57386.43    19.93
PS15dpv     03 40 02.91  +36 07 52.2  20151230.43  57386.43    20.93
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