GCN Circular 5604

Subject

GRB 060923C: VLT J-band observations

Event

Date

2006-09-24T18:11:53Z (20 years ago)

From

Daniele Malesani at SISSA-ISAS,Trieste,Italy <malesani@sissa.it>

Stefano Covino (INAF/OABr), Daniele Malesani (SISSA/ISAS), and Gianpiero 
Tagliaferri (INAF/OABr), report on behalf of the MISTICI collaboration:

We imaged the field of GRB 060923C (Stamatikos et al., GCN 5591Loading...
 
 ) on 2006 
Sep 24 from 3:39 to 4:16 UT with the ESO VLT+ISAAC in the J band under 
good seeing conditions.

Within the refined XRT error circle (Perri et al., GCN 5601Loading...
 
 ) we detect 
three sources with the following positions (RA, DEC, J2000) and magnitudes:

    A:    23:04:28.40, +03:55:29.1    19.23 +- 0.03
    B:    23:04:28.31, +03:55:29.0    22.87 +- 0.12
    C:    23:04:28.18, +03:55:28.5    21.33 +- 0.07

Source C could be extended. Absolute magnitudes are calibrated with 
respect to two 2MASS stars in the field. The reported errors are only 
statistical; the absolute calibration error may be of the order of ~0.15 
mag. At this stage, we cannot say whether any of these sources is 
related to GRB 060923C. A finding chart is posted at the followin URL:

http://www.sissa.it/~malesani/GRB/060923C/finder_ISAAC.jpg

Source A has been reported by Rau et al. (GCN 5598Loading...
 
 ) and could also be 
marginally visible in the DSS.

We acknowledge support from the ESO observing staff at Paranal, in 
particular Christophe Dumas and Emmanuel Jehin.

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