[vsnet-grb-info 14662] GRB 140311A: Montarrenti Observatory optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15976
SUBJECT: GRB 140311A: Montarrenti Observatory optical upper limit
DATE:    14/03/12 22:20:45 GMT
FROM:    Simone Leonini at Monarrenti Obs  <s.leonini at iol.it>

S. Leonini, P. Rosi, M. Conti, G. Guerrini and L.M. Tinjaca Ramirez 
(Montarrenti Observatory, Siena, Italy) report:

We observed the field of GRB140311A (Swift trigger 591390, Racusin et al., GCN 
Circ. 15944) with the automatic 0.53m RC telescope + U47 detector at 
Montarrenti Observatory (Siena, Italy, IAU code C88). 

The observations were started at 2014-03-12 00:20:19 UT (approximately 3 hours 
post-burst) stacking 5 unfiltered CCD exposures of 60s each.

We have not found optical transient within the error-box given by Swift. 

Mag. upper limit R = 20.02+/-0.16

Magnitudes were obtained using Astrometrica software using USNO-B1 catalogue 
and are not corrected for galactic extinction.

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