TITLE:   GCN CIRCULAR
NUMBER:  30216
SUBJECT: GRB 210610B: Liverpool Telescope optical photometry
DATE:    21/06/11 23:27:49 GMT
FROM:    Daniel Perley at Liverpool JMU  <d.a.perley@ljmu.ac.uk>

D. A. Perley (LJMU) reports:

The 2m robotic Liverpool Telescope observed the location of the optical 
afterglow of GRB 210610B (Page et al., GCN 30170) using the IO:O camera 
on 2021-06-11 UT between 22:45:44 and 22:55:45.  Photometry with 
reference to SDSS secondary standard stars in the field gives the 
following magnitudes:

dt_GRB(d) magnitude
1.12521   u = 20.43 +/- 0.11
1.12103   g = 20.04 +/- 0.05
1.12244   r = 19.81 +/- 0.02
1.12383   i = 19.61 +/- 0.03
1.12694   z = 19.49 +/- 0.06







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