TITLE:   GCN CIRCULAR
NUMBER:  23744
SUBJECT: GRB 190106A: Discovery Channel Telescope observations
DATE:    19/01/16 22:09:39 GMT
FROM:    Simone Dichiara at UMCP/NASA/GSFC  <dichiara@umd.edu>

S.Dichiara (UMD, NASA-GSFC), P. Gatkine (UMD), J.M. Durbak (UMD),
E. Troja (UMD, NASA-GSFC), A. Kutyrev (UMD, NASA-GSFC), S. Veilleux (UMD),
report on behalf of a larger collaboration:

We observed at the optical counterpart of GRB 190106A (Sonbas et al. GCN
23615) using the Large Monolithic Imager (LMI) on the 4.3m Discovery
Channel Telescope (DCT) at Happy Jack, AZ. Observations start on January
 08, 06:36:53 UT (about 41 hours after the Swift trigger) with SDSS r,
 i and z filters.
We measured the following magnitudes:

Start Time         Exposure       Filter    Magnitude
(hs from trigger)    (s)
--------------------------------------------------------------------
41.036               3x120          r'    20.77 +- 0.03
41.157               3x120          i'    20.60 +- 0.05
41.279               3x120          z'    20.70 +- 0.15
---------------------------------------------------------------------

Magnitudes are calibrated against SDSS nearby stars:
J015939.43+235056.5 25.7308, J015938.69+235101.6, J015933.94+235145.7 and
J015923.06+235109.1.
We thank the staff of the Discovery Channel Telescope for assistance with
these observations.