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GCN Circular 5609

Subject
GRB 060923C: NIR afterglow confirmed
Date
2006-09-25T17:09:07Z (18 years ago)
From
Daniele Malesani at SISSA-ISAS,Trieste,Italy <malesani@sissa.it>
Paolo D'Avanzo (INAF-OABr), Stefano Covino (INAF-OABr), Daniele  
Malesani (SISSA/ISAS), and Gianpiero Tagliaferri (INAF-OABr), report on 
behalf of the MISTICI collaboration:

We imaged again the field of GRB 060923C (Stamatikos et al., GCN  5591) 
on 2006 Sep 25 from 0:51 to 1:36 UT with the ESO VLT+ISAAC in  the J 
band. Seeing conditions were comparable to our previous observation 
(Covino et al., GCN 5604).

With respect to the first epoch of imaging, we detect sources A and C, 
with the same brightness. Source B has faded significantly and is barely 
detectable. Image subtraction performed with ISIS also confirms the fading.

We therefore fully confirm the identification by Fox (GCN 5607) of  
source B as the afterglow of GRB 060923C.

We acknowledge support from the ESO observing staff at Paranal.

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