[vsnet-grb-info 9636] GRB100816A: TNG optical afterglow confirmation.

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11104
SUBJECT: GRB100816A: TNG optical afterglow confirmation.
DATE:    10/08/16 06:28:22 GMT
FROM:    Angelo Antonelli at Obs. Astro. di Roma  <angelo.antonelli at oa-roma.inaf.it>

L. A. Antonelli (INAF-OAR), A. Fiorenzano (INAF-TNG), G. Tessicini  
(INAF-TNG), A. Stamerra (UniPisa) on behalf of the CIBO collaboration  
report:

We observed the field of the short hard GRB100816A (Swift trigger  
431764; Oates et al., GCN 11102) with the Italian 3.6m TNG telescope  
(La Palma, Canary Islands) equipped with the DOLORES camera.  
Observations started on Aug 16 at 03:22 UT (~2.8 hrs after the burst)  
under very poor weather conditions (high cloudiness and high  
humidity). We acquired a R band image of the GRB field for a total  
exposure time of 180s. We clearly detect a source consistent with the  
one reported by (Oates et al., GCN 11102). This souce, located at RA 
(J2000)=23:26:57.58; Dec(J2000)=+26:34:42.7 (+/-0.5''), showed a  
magnitude R~20.5 (calibrated against USNO B1.0) at the epoch of the  
observation. Due to its fading behavior with respect to the UVOT  
observation, we confirm that this source is the optical afterglow of  
GRB100816A.

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