{
  "bibcode": "2017GCN.20518....1H",
  "body": "M. E. Huber (IfA), K. C. Chambers (IfA), K. W. Smith (QUB),\nD. R. Young, S. J. Smartt, (QUB),, M. Coughlin (Harvard), T.-W. Chen\n(MPE), L. Denneau, H. Flewelling, A. Heinze, E. A. Magnier (IfA),\nA. Rest (STScI), B. Stalder (IfA), A. S. B. Schultz, C. W. Stubbs\n(Harvard) J. Tonry, C. Waters, R. J. Wainscoat, H. Weiland (IfA),\nD. E. Wright (QUB)\n\nWith Pan-STARRS1, we surveyed the primary northern area of the\nLALInference map (LIB_skymap.fits ; Veitch et al., PRD 91, 042003, GCN\n20486) following the release of the G270580 alert. Observations began\n57774.4 UT and lasted over two further nights.  The map of pointings is\nuploaded on GraceDB.\n\nImages were taken in the Pan-STARRS i-band in a series of overlapping\n45s exposures, with typically 4-8 images at each position.  These were\ncombined into stacks and subtracted from the Pan-STARRS1 3Pi reference\nimage (Chambers et al. arXiv:1612.05560, and available at\nhttp://panstarrs.stsci.edu). We reach approximately i~21-21.5 \ndepending on the number of images combined. \n\nUsing techniques discussed in Smartt et al. (2016, MNRAS, 462, 4094),\nwe have located and vetted transients with quality filters and a\nmachine learning algorithm on the images. \n\nIn the following table, we give our 124 targets, sorted by magnitude.\nThe lightcurve trend is given (LC trend), indicating the change in\nmagnitude between earliest and latest MJD of detection. To select\nthese targets we required a minimum of 2 detections over 2 separate\nnights.\n\nVariable sources which are likely AGN/QSOs or variable stars have, as\nfar as possible, been removed from this transient list.  We remove\nlikely AGN/QSOs either from catalogues, SDSS DR12 spectra, or nuclear\ntransients which in galaxies with previous core variability seen in\nPan-STARRS general survey mode. Similarly variable stars or stellar\noutbursts are removed through catalogue matching. The following list\nis composed of SN-like transients, to the best of our knowledge to\ndate.\n\nWe have removed previously known supernovae (in the preceding weeks\nbefore G270580) from this list. We recover PTSS-17dfn and PTSS-17dgm\nfrom Zhao et al. (GCN 20497,20506 ; the other is outside our field).\nThe list is sorted by magnitude and we recommend prioritising objects\nfor follow-up which are rising/falling in their lightcurve.\n\nsn = likely SN, offset from plausible host \nnt = nuclear transient. Not obvious AGN, but transient coincident with galaxy core\norphan = no obvious host \n\n\nName    RA (J2000)   Dec (J2000)  type    current trend         Disc. MJD  Disc Mag \nPS17ua  09 44 11.39  +32 50 36.7  sn      fading 00.01 (i-i)    57774.46    17.79 \nPS17of  10 02 34.60  +44 47 11.2  sn      rising 00.07 (i-i)    57774.47    18.53 \nPS17tn  09 43 13.64  +41 19 02.2  sn      rising 00.43 (i-i)    57774.47    18.81 \nPS17yh  09 59 44.73  +27 38 54.6  sn      rising 00.01 (i-i)    57774.53    19.03 PTSS-17dfn \nPS17so  09 39 11.89  +45 22 25.9  nt      fading 00.01 (i-i)    57774.47    19.24 \nPS17tp  09 43 15.22  +27 33 07.5  sn      fading 00.22 (i-i)    57774.54    19.25 \nPS17qr  09 30 36.59  +21 24 42.5  sn      fading 00.02 (i-i)    57774.51    19.33 PTSS-17dgm \nPS17xv  09 58 15.93  +33 28 16.7  sn      fading 00.18 (i-i)    57774.47    19.55 \nPS17yt  10 03 57.96  +49 02 28.3  sn      rising 00.54 (i-i)    57774.47    19.71 \nPS17wt  09 53 23.49  +60 09 31.5  sn      rising 00.19 (i-i)    57774.46    19.86 \nPS17nj  09 50 24.19  +63 35 07.7  nt      fading 00.01 (i-i)    57774.46    19.87 \nPS17ta  09 40 49.20  +27 50 41.2  nt      rising 00.01 (i-i)    57774.54    19.88 \nPS17ve  09 48 07.40  +33 05 12.3  sn      fading 00.09 (i-i)    57774.46    19.98 \nPS17st  09 39 36.56  +46 17 25.1  sn      fading 00.10 (i-i)    57774.46    20.00 \nPS17mc  09 36 03.65  +51 23 16.0  sn      rising 00.12 (i-i)    57774.47    20.02 \nPS17pp  09 21 01.11  +49 27 47.0  sn      rising 00.21 (i-i)    57774.48    20.07 \nPS17mr  09 42 43.78  +42 28 58.9  nt      fading 00.06 (i-i)    57774.46    20.08 \nPS17pt  09 23 31.33  +52 49 13.3  sn      rising 00.02 (i-i)    57774.45    20.09 \nPS17pm  09 18 21.83  +64 43 50.0  nt      rising 00.12 (i-i)    57774.46    20.11 \nPS17va  09 47 39.20  +37 22 27.6  sn      rising 00.26 (i-i)    57774.46    20.12 \nPS17na  09 46 12.72  +60 21 47.8  sn      rising 00.05 (i-i)    57774.46    20.20 \nPS17ra  09 32 04.34  +12 33 51.6  nt      fading 00.30 (i-i)    57774.53    20.25 \nPS17lf  09 27 04.26  +54 23 46.9  sn      fading 00.20 (i-i)    57774.46    20.29 \nPS17xn  09 56 26.51  +37 15 13.8  sn      fading 00.31 (i-i)    57774.48    20.38 \nPS17pg  08 59 59.66  +57 50 26.4  sn      fading 00.19 (i-i)    57774.40    20.39 \nPS17ol  10 06 47.59  +28 01 20.8  sn      fading 00.02 (i-i)    57773.62    20.42 \nPS17ze  10 06 05.38  +53 04 45.1  sn      fading 00.11 (i-i)    57774.47    20.42 \nPS17zj  10 11 15.00  +38 35 57.3  sn      rising 00.09 (i-i)    57774.45    20.44 \nPS17xs  09 57 05.59  +21 58 29.3  sn      rising 00.10 (i-i)    57774.54    20.46 \nPS17sz  09 40 39.32  +23 47 12.2  sn      fading 00.06 (i-i)    57774.54    20.47 \nPS17ov  08 29 57.36  +66 14 08.8  nt      rising 00.00 (i-i)    57774.46    20.48 \nPS17ql  09 29 15.03  +56 00 24.1  sn      rising 00.20 (i-i)    57774.46    20.49 \nPS17vw  09 50 34.59  +25 47 26.9  sn      rising 00.12 (i-i)    57774.53    20.49 \nPS17zf  10 07 01.98  +45 53 40.5  sn      rising 00.04 (i-i)    57774.47    20.52 \nPS17rb  09 32 14.26  +65 26 46.1  sn      fading 00.11 (i-i)    57774.45    20.53 \nPS17us  09 46 33.39  +46 22 07.7  sn      rising 00.08 (i-i)    57774.47    20.54 \nPS17pr  09 21 46.06  +58 12 49.9  sn      rising 00.00 (i-i)    57774.45    20.57 \nPS17sd  09 38 12.65  +16 03 29.6  sn      rising 00.14 (i-i)    57774.54    20.58 \nPS17ss  09 39 30.92  +33 21 15.3  sn      fading 00.01 (i-i)    57774.43    20.58 \nPS17sf  09 38 28.84  +39 46 01.3  sn      fading 00.03 (i-i)    57774.46    20.58 \nPS17qo  09 29 51.26  +44 31 14.6  sn      fading 00.08 (i-i)    57774.44    20.60 \nPS17se  09 38 27.88  +30 03 56.8  sn      rising 00.01 (i-i)    57774.47    20.63 \nPS17xg  09 55 06.39  +27 07 19.6  sn      rising 00.13 (i-i)    57774.54    20.63 \nPS17me  09 37 35.07  +25 35 58.6  sn      fading 00.36 (i-i)    57774.54    20.63 \nPS17on  10 10 22.80  +48 01 28.1  sn      rising 00.05 (i-i)    57774.42    20.65 \nPS17my  09 45 44.55  +20 47 29.5  nt      fading 00.13 (i-i)    57774.54    20.67 \nPS17ui  09 45 33.30  +27 52 23.9  sn      rising 00.08 (i-i)    57774.54    20.68 \nPS17nv  09 57 41.01  +17 49 33.4  orphan  fading 00.12 (i-i)    57774.49    20.68 \nPS17rw  09 36 33.10  +26 22 07.1  sn      fading 00.26 (i-i)    57774.54    20.71 \nPS17rj  09 34 39.14  +51 22 40.6  sn      fading 00.07 (i-i)    57774.48    20.71 \nPS17xo  09 56 30.75  +31 25 47.2  sn      fading 00.02 (i-i)    57774.50    20.72 \nPS17pn  09 18 26.20  +60 41 41.5  sn      fading 00.05 (i-i)    57774.46    20.72 \nPS17vv  09 50 28.24  +29 41 50.3  nt      rising 00.05 (i-i)    57774.54    20.72 \nPS17yi  09 59 48.09  +38 58 58.9  nt      fading 00.07 (i-i)    57774.47    20.73 \nPS17qt  09 30 41.85  +46 20 36.4  sn      rising 00.20 (i-i)    57774.45    20.73 \nPS17xm  09 56 09.82  +26 15 01.1  nt      fading 00.12 (i-i)    57774.54    20.74 \nPS17wy  09 53 53.21  +50 31 08.8  sn      fading 00.07 (i-i)    57774.46    20.75 \nPS17pv  09 25 07.35  +50 12 28.9  orphan  fading 00.07 (i-i)    57774.47    20.75 \nPS17lh  09 29 15.24  +26 47 51.0  sn      rising 00.00 (i-i)    57774.52    20.77 \nPS17xy  09 58 37.81  +29 07 33.6  sn      rising 00.23 (i-i)    57774.55    20.77 \nPS17yq  10 02 49.53  +42 24 00.8  sn      rising 00.09 (i-i)    57774.48    20.80 \nPS17wc  09 51 05.54  +29 22 46.3  sn      fading 00.12 (i-i)    57774.54    20.80 \nPS17ti  09 42 19.84  +21 37 11.1  sn      rising 00.02 (i-i)    57774.54    20.80 \nPS17yg  09 59 44.47  +24 12 03.4  sn      fading 00.07 (i-i)    57774.53    20.80 \nPS17pa  08 38 05.32  +61 24 50.3  sn      rising 00.07 (i-i)    57774.42    20.81 \nPS17pd  08 43 47.07  +64 31 31.4  sn      rising 00.15 (i-i)    57774.46    20.81 \nPS17yj  10 00 16.53  +50 52 03.1  nt      rising 00.02 (i-i)    57774.47    20.82 \nPS17vp  09 49 33.45  +48 49 32.0  sn      fading 00.08 (i-i)    57774.47    20.82 \nPS17ry  09 36 46.35  +26 02 05.2  sn      rising 00.02 (i-i)    57774.54    20.82 \nPS17qk  09 29 12.15  +25 49 06.4  orphan  fading 00.20 (i-i)    57774.54    20.83 \nPS17ud  09 45 03.09  +22 50 09.9  sn      rising 00.11 (i-i)    57774.54    20.86 \nPS17xx  09 58 27.56  +42 53 08.0  sn      fading 00.10 (i-i)    57774.48    20.87 \nPS17qx  09 31 47.56  +12 59 46.8  nt      fading 00.12 (i-i)    57774.53    20.87 \nPS17zb  10 05 56.86  +40 54 27.6  nt      rising 00.11 (i-i)    57774.47    20.88 \nPS17vd  09 48 00.80  +30 06 42.5  sn      fading 00.22 (i-i)    57774.51    20.89 \nPS17wr  09 53 16.55  +51 53 02.8  nt      fading 00.09 (i-i)    57774.48    20.89 \nPS17vu  09 50 16.84  +34 56 19.0  sn      rising 00.03 (i-i)    57774.46    20.90 \nPS17re  09 32 55.07  +52 12 49.5  sn      rising 00.31 (i-i)    57774.46    20.92 \nPS17kv  09 24 01.40  +49 26 03.8  sn      fading 00.04 (i-i)    57774.48    20.92 \nPS17ts  09 43 24.74  +18 08 49.9  sn      fading 00.02 (i-i)    57774.54    20.93 \nPS17xh  09 55 13.67  +46 15 18.9  sn      rising 00.10 (i-i)    57774.47    20.96 \nPS17kr  09 19 46.15  +59 28 37.2  sn      fading 00.09 (i-i)    57774.43    20.97 \nPS17rd  09 32 27.06  +55 40 43.1  sn      fading 00.02 (i-i)    57774.46    20.99 \nPS17vy  09 50 36.23  +22 04 33.8  sn      rising 00.03 (i-i)    57774.54    21.01 \nPS17uo  09 46 11.91  +48 18 56.0  sn      rising 00.22 (i-i)    57774.46    21.01 \nPS17wv  09 53 25.01  +32 39 23.8  sn      rising 00.04 (i-i)    57774.47    21.01 \nPS17tm  09 43 10.54  +34 44 02.2  sn      fading 00.08 (i-i)    57774.46    21.02 \nPS17ue  09 45 06.95  +17 42 19.0  sn      rising 00.27 (i-i)    57774.54    21.03 \nPS17su  09 40 08.78  +23 00 53.1  sn      rising 00.07 (i-i)    57774.54    21.04 \nPS17ku  09 23 44.48  +48 55 06.4  sn      rising 00.10 (i-i)    57774.48    21.06 \nPS17vf  09 48 11.27  +18 20 40.8  nt      rising 00.13 (i-i)    57774.54    21.08 \nPS17vg  09 48 15.51  +29 45 48.7  sn      fading 00.03 (i-i)    57774.54    21.08 \nPS17vt  09 49 57.95  +19 38 47.0  sn      rising 00.00 (i-i)    57774.54    21.09 \nPS17qp  09 30 30.25  +49 52 30.0  sn      rising 00.03 (i-i)    57774.47    21.09 \nPS17rr  09 35 30.85  +16 59 18.1  sn      rising 00.04 (i-i)    57774.55    21.10 \nPS17rz  09 36 57.19  +29 40 06.0  sn      rising 00.22 (i-i)    57774.47    21.12 \nPS17pi  09 05 00.75  +61 01 10.6  sn      rising 00.08 (i-i)    57774.45    21.14 \nPS17xp  09 56 36.86  +49 56 14.1  sn      rising 00.12 (i-i)    57774.46    21.15 \nPS17ph  09 01 00.16  +57 53 49.4  sn      rising 00.16 (i-i)    57774.40    21.16 \nPS17xf  09 55 02.96  +21 14 12.5  sn      fading 00.08 (i-i)    57774.54    21.16 \nPS17vc  09 47 46.66  +41 17 18.0  nt      rising 00.13 (i-i)    57774.46    21.18 \nPS17mp  09 41 52.10  +36 00 40.2  sn      fading 00.14 (i-i)    57774.45    21.18 \nPS17ws  09 53 19.79  +42 26 50.8  sn      fading 00.01 (i-i)    57774.46    21.19 \nPS17uu  09 47 01.91  +17 52 27.1  sn      rising 00.03 (i-i)    57774.53    21.19 \nPS17uw  09 47 10.01  +16 13 51.5  nt      rising 00.24 (i-i)    57774.56    21.20 \nPS17mf  09 37 43.60  +15 23 11.6  nt      fading 00.19 (i-i)    57774.52    21.21 \nPS17lk  09 29 58.27  +15 11 58.5  orphan  fading 00.02 (i-i)    57774.53    21.24 \nPS17xq  09 56 59.17  +27 31 23.2  sn      rising 00.07 (i-i)    57774.54    21.24 \nPS17qq  09 30 35.36  +50 14 34.0  sn      rising 00.12 (i-i)    57774.46    21.25 \nPS17rc  09 32 19.16  +47 03 38.3  orphan  rising 00.06 (i-i)    57774.46    21.27 \nPS17yl  10 00 40.10  +40 39 21.9  sn      rising 00.00 (i-i)    57774.47    21.27 \nPS17ro  09 35 07.03  +23 23 35.9  sn      fading 00.00 (i-i)    57774.53    21.33 \nPS17tv  09 43 41.58  +27 07 59.2  sn      fading 00.05 (i-i)    57774.54    21.35 \nPS17lp  09 31 42.79  +55 37 32.1  sn      rising 00.25 (i-i)    57774.45    21.36 \nPS17mg  09 37 44.15  +17 46 23.5  sn      rising 00.01 (i-i)    57774.54    21.37 \nPS17xk  09 56 08.33  +24 15 22.3  sn      rising 00.01 (i-i)    57774.54    21.43 \nPS17sn  09 39 11.32  +15 24 28.7  nt      rising 00.16 (i-i)    57774.52    21.44 \nPS17qs  09 30 38.38  +16 20 35.0  sn      rising 00.12 (i-i)    57774.53    21.45 \nPS17um  09 46 02.11  +20 57 16.3  sn      fading 00.01 (i-i)    57774.54    21.49 \nPS17qf  09 28 06.94  +16 23 30.8  sn      rising 00.46 (i-i)    57774.53    21.50 \nPS17pk  09 13 47.60  +64 02 59.7  sn      rising 00.48 (i-i)    57774.45    21.50 \nPS17vn  09 49 11.97  +19 17 06.7  sn      rising 00.30 (i-i)    57774.54    21.59 \nPS17tq  09 43 15.46  +16 57 16.2  nt      rising 00.12 (i-i)    57774.54    21.69 \nPS17sr  09 39 26.00  +23 46 04.8  sn      rising 00.16 (i-i)    57774.54    21.84",
  "circularId": 20518,
  "createdOn": 1485281712000,
  "email": "s.smartt@qub.ac.uk",
  "subject": "LIGO/Virgo G270580:  Pan-STARRS coverage and 124 optical transients",
  "submitter": "S. J. Smartt at Queens U Belfast  <s.smartt@qub.ac.uk>",
  "eventId": "LIGO/Virgo G270580"
}