[AAVSO-HEN] UVOT Observations of INTEGRAL burst GRB070615

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
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TITLE:   GCN CIRCULAR
NUMBER:  6540
SUBJECT: UVOT Observations of INTEGRAL burst GRB070615
DATE:    07/06/16 08:12:52 GMT
FROM:    Patricia Schady at MSSL/Swift  <ps at mssl.ucl.ac.uk>

P.Schady (MSSL-UCL) and N. Lyons (Leicster) report on behalf of the 
UVOT team

Swift/UVOT began observing the field of the INTEGRAL burst GRB070615 
10.7hrs after the IBAS trigger in the V and white filters. No afterglow 
is detected in any of the individual or co-added observations down to 
the following 5-sigma upper limits:

Filter           T_mid (s) Exp (s)   UL Mag (5sig)
====================================
V		46354	2887	19.59
White	51435	36		18.07
====================================

where T_mid corresponds to weighted mid time of the observation. The 
values quoted above are not corrected for the expected Galactic 
reddening of E(B-V) = 0.12 mag (Schlegel et al. 1998).