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ATEL # 2655; Edo Berger (Harvard)
on 1 Jun 2010; 18:05 UT
Distributed as an Instant Email Notice (Supernova)
Password Certification: Edo Berger (firstname.lastname@example.org)
Subjects: Infra-Red, Optical, Nova, Supernova, Transients
We inspected archival Hubble and Spitzer images of NGC3184 (DM~30.4 mag) covering the location of the new intermediate-luminosity optical transient SN2010dn (M~-12.9 mag; CBAT #2299). No source is detected in WFPC2 images from 2001 March 2 UT to 3-sigma limits of 24.1 mag in F555W and 24.9 mag in F814W. This corresponds to absolute magnitude limits of >-6.3 mag and >-5.5 mag, respectively. In addition, no source is detected in any of the IRAC images from 2004 November 26 UT to a rough 5-sigma limit of about 50 microJy at 3.6 micron, corresponding to a limit of L_nu<10^25 erg/s/cm^2/Hz. The nearest source in the HST and Spitzer images is located about 1.9' eastward of the nominal position of SN2010dn, and appears to be marginally extended.