[vsnet-grb-info 4101] GRB061201, VLT optical decay: correction

GCN Circulars gcncirc at capella.gsfc.nasa.gov
Wed Dec 13 00:00:59 JST 2006


TITLE:   GCN CIRCULAR
NUMBER:  5909
SUBJECT: GRB061201, VLT optical decay: correction
DATE:    06/12/12 15:00:46 GMT
FROM:    Paolo D'Avanzo at INAF-OAB  <paolo.davanzo at brera.inaf.it>

P. D'Avanzo (INAF-OABr & Univ. Insubria) and S. Piranomonte (INAF-OAR) 
report on behalf of the MISTICI collaboration:

A careful inspection and re-analysis of our VLT I-band images of the 
short GRB061201 (D'Avanzo & Piranomonte, GCN 5896) reveals that in our 
second epoch of observations (carried out 1.379 days after the burst) no 
object is clearly visible at the position of the optical counterpart 
(Holland et al. GCN 5883, Haislip et al. GCN 5895, D'Avanzo et al. GCN 
5884) down to I > 23.6 mag (3sigma confidence level).

So, with respect to our first epoch of observation (D'Avanzo et al. GCN 
5884) the afterglow clearly faded, but we can only constrain the decay 
index to be > 0.8.
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