TITLE:   GCN CIRCULAR
NUMBER:  23624
SUBJECT: GRB 190106A: Bassano Bresciano Observatory optical detection
DATE:    19/01/06 20:57:28 GMT
FROM:    Ulisse Quadri at Bassano Bresciano Obs  <oabb@ulisse.bs.it>

U.Quadri, L.Strabla and A.Quadri report:

We imaged the field of GRB 190106A detected by SWIFT(trigger 882252)
with the robotic telescope of (IAU station 565) Bassano Bresciano 
Observatory, Italy. Member of: 
AAVSO - American Association of Variable Star Observers.
ISSP - Italian Supernovae Search Project.
UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.

The observations started 6.16 hour after the GRB trigger,  
with our baker-Schmidt telescope D=250 mm F/D=3.

Weather conditions were good.

We co-added 2 series of 15 exposures of 60 sec each.

Start T0+      End T0+      Vlim
6.16 hour   6.72 hour       19.5

We detect the afterglow in the error box of the XRTcandidate.
E. Sonbas (Adiyaman Univ.), S. D. Barthelmy (GSFC), et al.
at the following position (+/- 2 arcsec):

RA (J2000.0) =  01h 59m 31.50s
DEC(J2000.0) = +23° 50' 44.7"

The results of our photometry are:

------------------------------------    
     JD          V mag       Cat
------------------------------------
2458490.33004   19.130 V    UCAC4   
2458490.34077   19.344 V    UCAC4   
------------------------------------
 
Magnitudes were estimated with the UCAC4 cat. and 
are not corrected for galactic dust extinction.

The images are available at:
http://www.osservatoriobassano.org/GRB.asp

The message may be cited.