{
  "bibcode": "2017GCN.21633....1C",
  "body": "K. C. Chambers (IfA), M. E. Huber (IfA),K. W. Smith (QUB),\nS. J. Smartt, (QUB), D. R. Young, M. Coughlin (Harvard), T.-W. Chen\n(MPE), J. Bulger, L. Denneau, H. Flewelling, A. Heinze, E. Kankare\n(QUB), T. Lowe, E. A. Magnier (IfA), A. Rest (STScI), B. Stalder\n(IfA), A. S. B. Schultz, C. W. Stubbs (Harvard) J. Tonry, C. Waters,\nR. J. Wainscoat, H. Weiland, M. Willman (IfA), D. E. Wright (QUB)\n\nWe report continued Pan-STARRS imaging of the transient SSS17a/DLT17ck\nin NGC4339 in filters i, z and y (see Chambers et al. GCN 21553 for\nmore details of filters, photometry, methods etc).\n\nOur reference stack and calibrations provide rapid reliable photometry\nwith the host removed and we will continue to post updates while it is\nvisible from Hawaii.  A series of short exposures to avoid sky\nsaturation in twilight in each of i, z, and y provide average nightly\nmagnitudes (AB) as follows. \n\nPan-STARRS is observing at lower altitude than it has ever done, Poor\nconditions and airmass>3 hampered the fourth night of observing (57986\n= 2017-08-21 UT).  The difference images showed faint flux in z band,\nbut no detection in i and y. The forced photometry in the z-band at\nthe position of the transient is reported. The quick estimates for i\nand y need to be verified.\n\nMJD             i       err \n57983.23\t17.24\t0.06\n57984.24\t17.91\t0.05\n57985.24\t18.47\t0.08\n57986.24        <18.5   limit only    \n\nMJD             z       err \n57983.23\t17.26\t0.06\n57984.24\t17.80\t0.05\n57985.24\t18.31\t0.06\n57986.24        18.27   0.33 \n\nMJD             y       err \n57983.23\t17.38\t0.10\n57984.24\t17.59\t0.07\n57985.24\t18.08\t0.07\n57986.23        <18.0   limit only",
  "circularId": 21633,
  "createdOn": 1503331432000,
  "email": "s.smartt@qub.ac.uk",
  "subject": "LIGO/Virgo G298048: Pan-STARRS izy photometry of SSS17a/DLT17ck",
  "submitter": "S. J. Smartt at Queens U Belfast  <s.smartt@qub.ac.uk>",
  "eventId": "LIGO/Virgo G298048"
}