Some Sentinel-1A SLC images can not be found in the data hub

Hi, all,

Below is the search requset I used to search the Sentinel-1A images in my study area (86.14-86,84E, 42.19-42.65N) for the day 08-21, 2015. However, only a GRDH data can be found:
“S1A_IW_GRDH_1SSV_20150821T120918_20150821T120943_007361_00A1D2_0B94”
, while the corresponding SLC level data didn’t appear. It seems that the SLC data for this scene has not been put into the data hub. So, could anyone tell me how to access it? thanks.

ASCENDING AND (
footprint:“Intersects(POLYGON((86.14230105902617
42.196394489776765,86.84727109541447
42.196394489776765,86.84727109541447
42.650911429477276,86.14230105902617
42.650911429477276,86.14230105902617 42.196394489776765)))” ) AND (
beginPosition:[2015-08-20T00:00:00.000Z TO 2015-08-22T23:59:59.999Z] AND
endPosition:[2015-08-20T00:00:00.000Z TO 2015-08-22T23:59:59.999Z] )

Questions about Scihub and data access should be emailed to EOSupport@copernicus.esa.int