Abstract

We announce the probable discovery of a new very bright gravitationally lensed QSO, HS 0810+2554 (z = 1.50, V = 15.3). The gravitational lens character has been discovered serendipitously by means of short (12 times 1 s) HST/STIS target acquisition images. The coadded images show a close bright double A (V = 16.0) and B (16.7) separated by 0?.25 plus two fainter images C (17.4) and D (18.8). There is also evidence for a lens galaxy in the center of the images which is fainter than A by a factor of ?30 at 7150 Å. The image configuration resembles very much that of PG 1115+080 except that in HS 0810+2554 image splittings (?1?) are smaller by a factor of ?2.5 and HS 0810+2554 is brighter by ?1m.