Archival searches for transient optical emission in the error box of the   1991 January 22 gamma-ray burst
  We present here the results of a study carried out at the Harvard College Observatory Plate Collection. We examined 3995 plates covering the error box of the gamma-ray burst GRB 910122, over a time span of 90 yr (from 1889 to 1979). The total exposure time is ~0.55 yr. No convincing evidence of optical transient emission was found within the GRB 910122 IPN error box. However, a possible OT was found outside the GRB 910122 error box. Optical ground based observations have revealed a V~22.3 object consistent with the position of the new object. The colours of the object are typical of a K7/M0 star or a reddened galaxy, which could have caused the OT, but the fact that the object is far away from the GRB error box makes both events unrelated. 
Javier Gorosabel (1), Alberto Castro-Tirado (1,2) ((1) LAEFF-INTA,   Madrid, Spain, (2) IAA-CSIC, Granada, Spain)