[AAVSO-HEN] GRB 070707: object inside XRT error circle

[grb at aavso.org]

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TITLE:   GCN CIRCULAR
NUMBER:  6612
SUBJECT: GRB 070707: object inside XRT error circle
DATE:    07/07/08 19:10:28 GMT
FROM:    Paolo D'Avanzo at INAF-OAB  <paolo.davanzo at brera.inaf.it>

S. Piranomonte (INAF-OAR), S. Vergani (DIAS-DCU), P. D'Avanzo & G. 
Tagliaferri (INAF-OABr) report on behalf of the MISTICI collaboration:

Following the detection by Swift/XRT (Beardmore et al., GCN 6610) of GRB 
070707 (Beckmann et al., GCN 6605; Gotz et al., GCN 6607), we have 
inspected our VLT R-band images (D'Avanzo et al., GCN 6609).

Inside the XRT error box, we find a single source with R ~ 23.0 
(calibrated using archival instrumental zeropoints), at the coordinates 
(J2000, 0.5" error):

RA(2000) = 17:50:58.55
Dec(2000) = -68:55:27.2

At the present stage, we cannot yet assess the relationship of this 
source with GRB 070707. Further observations are planned.

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