TITLE: GCN CIRCULAR NUMBER: 11735 SUBJECT: GRB 110213B: Possible Host Galaxy in SDSS Stripe 82 Imaging DATE: 11/02/16 01:20:22 GMT FROM: S. Bradley Cenko at Caltech S. B. Cenko, J. S. Bloom, and A. A. Miller (UC Berkeley) report on behalf of a larger collaboration: The location of the X-ray (Nakahira et al., GCN 11725) and optical (Cenko et al., GCN 11732) afterglow of GRB 110213B (Negoro et al, GCN 11716) was observed repeatedly over the seven year period beginning in 1998 as part of the SDSS Stripe 82 Survey (Bramich et al., MNRAS 2008, 386, 887). We have extracted all images covering this location from the SDSS Stripe 82 database to create stacked frames in the g, r, and i filters. A false-color composite image of the afterglow location can be found at: http://astro.berkeley.edu/~cenko/public/grb/GRB110213B/sdss.png Using 10 nearby point sources from SDSS for astrometry, we measure a revised position for the P60 optical afterglow candidate of (J2000.0): RA: 02:47:01.45 Dec: +01:08:46.5 The measured uncertainty in the P60-SDSS astrometric tie is 100 mas in each coordinate. Offset by 0.9" from the location of the afterglow, we find an extended source in the pre-outburst SDSS Stripe 82 imaging in all three filters. We measure coordinates (J2000.0) for this source: RA: 02:47:01.41 Dec: +01:08:47.2 Using several nearby point sources from SDSS for comparison, we measure magnitudes of g' = 23.7, r' = 22.8, i' = 22.3 Additional emission is marginally detected in the i' filter approximately 3" south of this position, but its relation to this object is unclear. This extended source could be a relatively nearby host galaxy for GRB110213B, although the red colors are somewhat unusual for GRB hosts.