TITLE:   GCN CIRCULAR
NUMBER:  34031
SUBJECT: ZTF23aaoohpy/AT2023lcr: Liverpool Telescope detection
DATE:    23/06/20 00:47:30 GMT
FROM:    Daniel Perley at Liverpool JMU <d.a.perley@ljmu.ac.uk>

Daniel A. Perley (LJMU), Maggie Li (Cornell), and Anna Y. Q. Ho (Cornell) report:
 
We obtained Liverpool Telescope follow-up imaging observations of the fast optical transient ZTF23aaoohpy/AT2023lcr (Swain et al., GCN 34022) on the night of 2023-06-19.  Observations were conducted in g/r/i filters between UT 22:15-22:29 and in u/r/z filters between 22:47-23:05.
 
The source is well-detected in the g, r, i, and z filters.  We measure photometry of:
 
MJD          magnitude
60114.92765  g = 21.32 +/- 0.08
60114.93103  r = 20.88 +/- 0.06
60114.93440  i = 20.68 +/- 0.06
60114.94962  r = 21.04 +/- 0.06
60114.95300  z = 20.47 +/- 0.10
60114.95733  u > 21.3
 
The photometry is well-fit by a power-law with spectral index (F_nu ~ nu^beta) of beta ~ -1.2, consistent with GRB afterglows.