TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  5130
SUBJECT: Swift/UVOT observations of GRB060512.
DATE:    06/05/14 02:15:47 GMT
FROM:    Massimiliano de Pasquale at MSSL-UCL  <mdp@mssl.ucl.ac.uk>

  M. De Pasquale (UCL-MSSL) and J. Cummings (NASA/ORAU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began observing the afterglow of
GRB 060512 (Cummings et al., 5117) at 2006-05-12 at
23:14:54, 94 s after the BAT trigger. A bright
optical afterglow is detected in the U, V, B,
and white filters inside the XRT refined error
circle (Godet et al., GCN 5128).

We obtain the following photometry of the afterglow.

Filter  Exposure(s)  T_range(s)   Magnitude       Note

V       10             94-104     15.88 +/- 0.17
V       230           217-447     17.15 +/- 0.11
V       197         2804-3004     19.14 +/- 0.42
V       885        9466-10369     20.05 +/- 0.41
V       885       27685-28591        >20.18      3-sig limit


B       197         4290-4490     19.50 +/- 0.21
B       197         5722-5922     20.17 +/- 0.35
B       146       17069-17117        >20.2       3-sig limit


U       197         4145-4345     19.48 +/- 0.30
U       197         5520-5720     19.69 +/- 0.29
U       885       16757-17657     20.31 +/- 0.23
U       345       22847-23192     20.40 +/- 0.46


W1     2166        3881-22840         >21.0      3-sig limit

M2     2923        3676-29221         >21.1      3-sig limit

W2     3481        4700-27718         >21.04     3-sig limit


White    99           114-214     16.34 +/- 0.03
White   197         4494-4694     19.14 +/- 0.33
White   197         5927-6126     19.67 +/- 0.35


  The detection in the U, B and V, together with the non-detection
in the UV filters, may indicate that the redshift of this burst is
less than approximately 2.5.

The values quoted above are not corrected for the low expected
Galactic extinction E(B-V)=0.02.