TITLE:   GCN CIRCULAR
NUMBER:  21567
SUBJECT: LIGO/Virgo G298048: Correction to Swope photometry announced in LVC GCN 21529
DATE:    17/08/18 17:19:22 GMT
FROM:    Ryan Foley at UCSC  <foley@ucsc.edu>

D. A. Coulter, C. D. Kilpatrick, M. R. Siebert, R. J. Foley (UCSC), B. J. Shappee, M. R. Drout, J. S. Simon, and A. L. Piro (Carnegie)

on behalf of the One-Meter Two-Hemisphere (1M2H) collaboration:

We report a correction to the photometric magnitude of SSS17a announced in LVC GCN 21529.  After re-examination of the imaging and using 97 APASS i' standards for relative photometry, we conclude that the source had a brightness of i = 17.3 +/- 0.1 mag at the time of observation on UT 2017-08-17.98.  We apologize for the error.