GCN Circular 9093

D. Malesani, J.P.U. Fynbo (DARK/NBI), P. Jakobsson (Univ. Iceland), A.J. 
Levan (Univ. Warwick), T. Liimets (Tartu Obs. and NOT), and Z. Banhidi 
(NOT), report on behalf of a larger collaboration:

We observed the field of GRB 090404 (Ziaeepour et al., GCN 9086
Not found
 
 
) with 
the NOT equipped with StanCam. Observations were carried out in the R 
and I bands, starting on 2009 Apr 5.035 UT (8.89 hr after the GRB). A 
total of 20 min exposure per filter were secured.

We do not detect any object inside the revised XRT error circle 
(Beardmore et al., GCN 9088
Not found
 
 
), down to limiting magnitudes R > 23.5, I > 
22.3, assuming R = 19.19 and I = 18.84 for the USNO-B1 star 1255-0233978 
at RA = 15:57:00.24, Dec = +35:31:28.0.

We note the presence of a faint object (R = 22.8), possibly extended, 
just outside the XRT circle, at coordinates (J2000):

RA = 15:56:57.72
Dec = +35:30:58.2

This position is 2.4" away from the XRT error circle center, which has 
currently an error radius of 1.4" (from 
http://www.swift.ac.uk/xrt_positions/index.php). We cannot state whether 
this object is related to GRB 090404. Further observations are ongoing.

[GCN OPS NOTE(06may09): Per author's request, the institutional
affiliation of Banhidi was changed to NOT.]