PAGE  1
000 B000000 08/31/2014
000 C000000 0001160864
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 BLACKROCK CORE BOND TRUST
001 B000000 811-10543
001 C000000 8004417762
002 A000000 100 BELLEVUE PARKWAY
002 B000000 WILMINGTON
002 C000000 DE
002 D010000 19809
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 N
007 B000000  0
007 C010100  1
008 A000001 BLACKROCK ADVISORS, LLC
008 B000001 A
008 C000001 801-47710
008 D010001 WILMINGTON
008 D020001 DE
008 D030001 19809
012 A000001 COMPUTERSHARE TRUST COMPANY, N.A.
012 B000001 85-11340
012 C010001 CANTON
012 C020001 MA
012 C030001 02021
013 A000001 DELOITTE & TOUCHE LLP
013 B010001 BOSTON
013 B020001 MA
013 B030001 02116
014 A000001 BLACKROCK EXECUTION SERVICES
014 B000001 8-48719
014 A000002 BLACKROCK INVESTMENTS, LLC
014 B000002 8-48436
014 A000003 HARRIS WILLIAMS LLC
014 B000003 8-53380
014 A000004 PNC CAPITAL MARKETS, INC.
014 B000004 8-32493
014 A000005 PNC INVESTMENTS LLC
014 B000005 8-66195
015 A000001 STATE STREET BANK & TRUST COMPANY
015 B000001 C
015 C010001 BOSTON
      PAGE  2
015 C020001 MA
015 C030001 02110
015 E010001 X
015 A000002 STATE STREET BANK & TRUST COMPANY
015 B000002 S
015 C010002 TORONTO
015 D010002 CANADA
015 D020002 M5V 3L3
015 E040002 X
015 A000003 HSBC AUSTRALIA
015 B000003 S
015 C010003 SYDNEY
015 D010003 AUSTRALIA
015 E040003 X
015 A000004 HSBC JAPAN
015 B000004 S
015 C010004 TOKYO
015 D010004 JAPAN
015 E040004 X
015 A000005 CLEARSTREAM BANKING SA
015 B000005 S
015 C010005 LUXEMBOURG
015 D010005 LUXEMBOURG
015 E040005 X
015 A000006 BANCO NACIONAL DE MEXICO SA
015 B000006 S
015 C010006 MEXICO CITY
015 D010006 MEXICO
015 D020006 01210
015 E040006 X
015 A000007 HSBC BANK LTD. NEW ZEALAND
015 B000007 S
015 C010007 AUCKLAND
015 D010007 NEW ZEALAND
015 E040007 X
015 A000008 STATE STREET BANK AND TRUST
015 B000008 S
015 C010008 LONDON
015 D010008 UNITED KINGDOM
015 E040008 X
018  000000 Y
019 A000000 Y
019 B000000  288
019 C000000 BLKRKADVSR
020 A000001 BANK OF AMERICA CORP
020 B000001 56-0906609
020 C000001     31
021  000000       31
022 A000001 CREDIT SUISSE
022 B000001 13-3442768
022 C000001     79963
      PAGE  3
022 D000001    209427
022 A000002 JPMORGAN SECURITIES INC
022 B000002 13-3299429
022 C000002    138196
022 D000002    131158
022 A000003 BLK LIQUIDITY FUNDS, TEMPFUND, INST. CLASS
022 B000003 52-0983343
022 C000003    119806
022 D000003    124399
022 A000004 GOLDMAN SACHS & CO
022 B000004 13-5108880
022 C000004    115714
022 D000004    116677
022 A000005 DEUTSCHE BANK SECURITIES, INC.
022 B000005 13-2730828
022 C000005     95841
022 D000005     91837
022 A000006 BNP PARIBAS
022 B000006 13-3235334
022 C000006     48326
022 D000006     84614
022 A000007 UBS SECURITIES LLC
022 B000007 13-3873456
022 C000007     47335
022 D000007     34471
022 A000008 BARCLAYS CAPITAL INC.
022 B000008 13-3297824
022 C000008     21513
022 D000008     58147
022 A000009 MORGAN STANLEY
022 B000009 36-3145972
022 C000009     18100
022 D000009     28265
022 A000010 ROYAL BANK OF CANADA
022 B000010 13-5033225
022 C000010     17873
022 D000010     25624
023 C000000     765471
023 D000000     963949
024  000000 Y
025 A000001 CREDIT SUISSE
025 B000001 13-3442768
025 C000001 D
025 D000001    7092
025 A000002 UBS SECURITIES LLC
025 B000002 13-3873456
025 C000002 D
025 D000002    7825
025 A000003 DEUTSCHE BANK SECURITIES, INC.
025 B000003 13-2730828
025 C000003 D
      PAGE  4
025 D000003    1182
025 A000004 MORGAN STANLEY
025 B000004 36-3145972
025 C000004 D
025 D000004    9688
025 A000005 BANK OF AMERICA CORP
025 B000005 56-0906609
025 C000005 D
025 D000005    8120
025 A000006 JPMORGAN SECURITIES INC
025 B000006 13-3299429
025 C000006 D
025 D000006   16817
025 A000007 GOLDMAN SACHS & CO
025 B000007 13-5108880
025 C000007 D
025 D000007    7034
025 A000008 GOLDMAN SACHS & CO
025 B000008 13-5108880
025 C000008 E
025 D000008    1126
025 A000009 BNP PARIBAS
025 B000009 13-3235334
025 C000009 D
025 D000009    1168
025 A000010 BARCLAYS CAPITAL INC
025 B000010 13-3297824
025 C000010 D
025 D000010    1965
026 A000000 N
026 B000000 N
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027  000000 N
028 A010000         0
028 A020000         0
028 A030000         0
028 A040000         0
028 B010000         0
028 B020000         0
028 B030000         0
028 B040000         0
028 C010000         0
028 C020000         0
028 C030000         0
028 C040000         0
      PAGE  5
028 D010000         0
028 D020000         0
028 D030000         0
028 D040000         0
028 E010000         0
028 E020000         0
028 E030000         0
028 E040000         0
028 F010000         0
028 F020000         0
028 F030000         0
028 F040000         0
028 G010000         0
028 G020000         0
028 G030000         0
028 G040000         0
028 H000000         0
030 A000000      0
030 B000000  0.00
030 C000000  0.00
031 A000000      0
031 B000000      0
032  000000      0
033  000000      0
035  000000      0
036 B000000      0
038  000000      0
042 A000000   0
042 B000000   0
042 C000000   0
042 D000000   0
042 E000000   0
042 F000000   0
042 G000000   0
042 H000000   0
043  000000      0
044  000000      0
045  000000 Y
046  000000 N
047  000000 Y
048  000000  0.550
048 A010000        0
048 A020000 0.000
048 B010000        0
048 B020000 0.000
048 C010000        0
048 C020000 0.000
048 D010000        0
048 D020000 0.000
048 E010000        0
048 E020000 0.000
      PAGE  6
048 F010000        0
048 F020000 0.000
048 G010000        0
048 G020000 0.000
048 H010000        0
048 H020000 0.000
048 I010000        0
048 I020000 0.000
048 J010000        0
048 J020000 0.000
048 K010000        0
048 K020000 0.000
049  000000 N
050  000000 N
051  000000 N
052  000000 N
053 A000000 Y
053 B000000 Y
053 C000000 N
054 A000000 Y
054 B000000 Y
054 C000000 N
054 D000000 N
054 E000000 N
054 F000000 N
054 G000000 N
054 H000000 Y
054 I000000 N
054 J000000 Y
054 K000000 N
054 L000000 N
054 M000000 Y
054 N000000 N
055 A000000 Y
055 B000000 N
056  000000 Y
057  000000 N
058 A000000 N
059  000000 Y
060 A000000 Y
060 B000000 Y
061  000000        0
062 A000000 Y
062 B000000   0.0
062 C000000   0.0
062 D000000   0.0
062 E000000   0.0
062 F000000   0.0
062 G000000   0.0
062 H000000   0.0
062 I000000   0.0
      PAGE  7
062 J000000   0.0
062 K000000  -0.4
062 L000000   0.2
062 M000000  14.2
062 N000000  12.4
062 O000000   3.1
062 P000000  79.8
062 Q000000  33.3
062 R000000   1.6
063 A000000   0
063 B000000 22.1
064 A000000 N
064 B000000 Y
065  000000 N
066 A000000 N
067  000000 N
068 A000000 N
068 B000000 N
069  000000 N
070 A010000 Y
070 A020000 N
070 B010000 N
070 B020000 N
070 C010000 Y
070 C020000 N
070 D010000 Y
070 D020000 N
070 E010000 Y
070 E020000 Y
070 F010000 N
070 F020000 N
070 G010000 Y
070 G020000 N
070 H010000 N
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 N
070 K010000 Y
070 K020000 Y
070 L010000 Y
070 L020000 Y
070 M010000 Y
070 M020000 Y
070 N010000 Y
070 N020000 N
070 O010000 Y
070 O020000 Y
070 P010000 Y
070 P020000 N
      PAGE  8
070 Q010000 N
070 Q020000 N
070 R010000 Y
070 R020000 Y
071 A000000    480860
071 B000000    466083
071 C000000    568293
071 D000000   82
072 A000000 12
072 B000000    27123
072 C000000      310
072 D000000        0
072 E000000        0
072 F000000     3100
072 G000000       58
072 H000000        0
072 I000000       56
072 J000000       47
072 K000000        0
072 L000000       19
072 M000000       45
072 N000000        9
072 O000000        0
072 P000000      410
072 Q000000        0
072 R000000       83
072 S000000       35
072 T000000        0
072 U000000      226
072 V000000        0
072 W000000       87
072 X000000     4175
072 Y000000      173
072 Z000000    23431
072AA000000     3252
072BB000000        0
072CC010000    29982
072CC020000        0
072DD010000    24500
072DD020000        0
072EE000000        0
073 A010000   0.9060
073 A020000   0.0000
073 B000000   0.0000
073 C000000   0.0000
074 A000000     1893
074 B000000        0
074 C000000        0
074 D000000   588945
074 E000000     6549
074 F000000        0
      PAGE  9
074 G000000        0
074 H000000      954
074 I000000     1316
074 J000000      178
074 K000000        0
074 L000000     6492
074 M000000       78
074 N000000   606405
074 O000000    19789
074 P000000      253
074 Q000000        0
074 R010000   168301
074 R020000        0
074 R030000     2581
074 R040000     3403
074 S000000        0
074 T000000   412078
074 U010000    27042
074 U020000        0
074 V010000    15.24
074 V020000     0.00
074 W000000   0.0000
074 X000000    16834
074 Y000000   177454
075 A000000        0
075 B000000   394180
076  000000    13.64
077 A000000 Y
077 B000000 Y
077 O000000 Y
078  000000 N
080 A000000 FEDERAL INSURANCE COMPANY
080 B000000 NATL UNION FIRE INS CO OF PITTSBURGH, PA
080 C000000    68125
081 A000000 Y
081 B000000  82
082 A000000 N
082 B000000        0
083 A000000 N
083 B000000        0
084 A000000 N
084 B000000        0
085 A000000 Y
085 B000000 N
086 A010000      0
086 A020000      0
086 B010000      0
086 B020000      0
086 C010000      0
086 C020000      0
086 D010000      0
      PAGE  10
086 D020000      0
086 E010000      0
086 E020000      0
086 F010000      0
086 F020000      0
087 A010000 COMMON STOCK
087 A020000 09249E101
087 A030000 BHK
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 N
SIGNATURE   NEAL J. ANDREWS
TITLE       CFO