GCN Circular 6583
R. Forster, M. Wright, J. Hare, J. S. Bloom, G. C. Bower (UC Berkeley) report on behalf of a large collaboration: "Using the Allen Telescope Array (ATA, http://ral.berkeley.edu/ata/), we observed GRB 070612A (Grupe et al., GCN 6509) at 1.4 GHz on 2007 June 16 UT and at 5 GHz on 2007 June 17 UT. The observations made use of 8 antennas outfitted with dual-polarization receivers. At the location of the optical afterglow (Updike et al., GCN 6515), we obtained 3-sigma limits of 50 mJy at 1.4 GHz and 10 mJy at 5 GHz for the flux density of GRB 070612A at these epochs. The data were calibrated versus the QSS 0927+392. At L-band the 8 brightest NVSS were measured to be located within 10% of the synthesized beamwidth and 100 mJy of the NVSS flux densities. The limits reported herein are consistent with the tentative WSRT detection at 4.9 GHz (Horst et al. GCNs 6549, 6576). A 42-antenna ATA is currently being commissioned." This message may be cited.