Cycle 28 Recommended Targets: Statistics

Statistics for all proposals submitted to the peer review, including the GTO proposals which were competed. This does NOT include GTO time which was uncompeted or Calibration observations. Units for time are given in kiloseconds.

1. Proposals by Type

                                Requested  
Type           #Prop   #Tgts  #TC=Y    ReqTime    w/Prob
--------------------------------------------------------
GO              202     636   112     28378.41  28378.41
GTO/TOO           1       1     0       300.00     30.00
LP               32     203     4     18664.14  18664.14
TOO              53     102    29      7077.00   3955.10
TOO/LP            1       2     2       470.00     94.00
VLP              11     522     2     17699.00  17699.00


                ---    ----   ---    --------- ---------
                300    1466   149     72588.55  68820.65

                 Approved 
#Prop   #Tgts  #TC=Y    AppTime    w/Prob Units
-------------------------------------------------
  75     214    68      9319.60   9319.60  ksec

   7      13     1      4054.00   4054.00  ksec
  24      36    16      2850.00   1311.30  ksec
   1       2     2       470.00     94.00  ksec
   1       1     0      1000.00   1000.00  ksec


 ---    ----   ---    --------- ---------
 108     266    87     17693.60  15778.90

Multicycle Proposals

Requested Type #Prop Cycle 28 Cycle 29 Cycle 30 -------------------------------------------------- GO 5 414.00 369.00 117.00 LP 1 420.00 140.00 0.00 TOO 2 213.00 64.00 13.00 VLP 1 334.00 333.00 333.00 ----- --------- --------- --------- 9 1381.00 906.00 463.00

Approved #Prop Cycle 28 Cycle 29 Cycle 30 ------------------------------------ 4 378.00 333.00 117.00 1 90.00 34.00 1.00 ----- --------- --------- --------- 5 468.00 367.00 118.00

2. Proposals by Subject Category
#Props includes Archive/Theory proposals.

                                                    Requested 
Category                                   #Prop   #Tgts     ReqTime     w/Prob
-------------------------------------------------------------------------------
SOLAR SYSTEM AND EXOPLANETS                    1      10       210.00    210.00
STARS AND WD                                  32     126      6063.20   6023.20
WD BINARIES AND CV                             6      10       620.00    462.00
BH AND NS BINARIES                            41     115      5208.80   4396.80
SN, SNR AND ISOLATED NS                       50     116      6532.00   5182.85
GRAVITATIONAL WAVE EVENT                       4       5      1320.00    449.00
NORMAL GALAXIES: DIFFUSE EMISSION              3       4       310.00    310.00
NORMAL GALAXIES: X-RAY POPULATIONS            13      43      4877.00   4877.00
ACTIVE GALAXIES AND QUASARS                   99     595     26959.05  26477.55
CLUSTERS OF GALAXIES                          40      93     16588.50  16588.50
EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS     3      17       477.00    477.00
GALACTIC DIFFUSE EMISSION AND SURVEYS          8     332      3423.00   3366.75
                                             ---    ----    --------- ---------
                                             300    1466     72588.55  68820.65

           Approved 
  #Prop   #Tgts    AppTime    w/Prob
  ----------------------------------
    0       0         0.00      0.00
   12      51      1909.00   1909.00
    2       4       185.00    102.00
   18      27      2284.00   1880.70
   18      47      2488.00   1934.35
    1       2       470.00     94.00
    0       0         0.00      0.00
    4      11       918.00    918.00
   37      96      5943.10   5500.60
   13      25      3261.50   3261.50
    0       0         0.00      0.00
    3       3       235.00    178.75
  ---    ----     --------  --------
  108     266     17693.60  15778.90

Multicycle Proposals

Requested Category #Prop Cycle 28 Cycle 29 Cycle 30 ------------------------------------------------------------------------------ ACTIVE GALAXIES AND QUASARS 4 872.00 591.00 415.00 BH AND NS BINARIES 2 150.00 64.00 1.00 SN, SNR AND ISOLATED NS 1 123.00 30.00 12.00 STARS AND WD 2 236.00 221.00 35.00 ----- --------- --------- --------- 9 1381.00 906.00 463.00

Approved #Prop Cycle 28 Cycle 29 Cycle 30 ----------------------------------- 1 82.00 82.00 82.00 2 150.00 64.00 1.00 2 236.00 221.00 35.00 --- --------- --------- --------- 5 468.00 367.00 118.00

3. Targets,Exposure Time by Detector

                                Requested
Detector  Grating    #Tgts      Time    w/Prob
----------------------------------------------
ACIS-I    NONE         666  21764.00  21696.50
ACIS-S    HETG          33   4356.00   3919.10
ACIS-S    NONE         663  42433.85  39222.85
HRC-I     LETG           2    318.20    318.20
HRC-I     NONE          77   2945.50   2945.50
HRC-S     LETG           8    601.00    548.50
HRC-S     NONE          17    170.00    170.00
                      ---- --------- ---------
                      1466  72588.55  68820.65

            Approved
 #Tgts      Time    w/Prob
--------------------------
    34   3323.00   3315.00
    11   1776.00   1615.10
   182  10994.10   9300.80

    35   1386.50   1386.50
     4    214.00    161.50

  ----  --------  --------
   266  17693.60  15778.90

4. Targets by Exposure Time Range

            Requested
Time            #Tgts
---------------------
   0<=T<2            3
   2<=T<4           12
   4<=T<8          370
   8<=T<16         419
  16<=T<32         228
  32<=T<64         190
  64<=T<128        123
 128<=T<400         95
 400<=T<1000        21
1000<=T<10000        5

5. Proposals by Exposure Time Range

            Requested
Time            #Prop
---------------------
   0<=T<2            0
   2<=T<4            0
   4<=T<8            1
   8<=T<16           7
  16<=T<32          11
  32<=T<64          47
  64<=T<128         79
 128<=T<400        107
 400<=T<1000        37
1000<=T<10000       11

6. Number of Proposals per P.I.

   Requested
#Prop   #P.I.
-------------
  1       176
  2        38
  3        12
  4         3

 Approved
     #P.I.
 ---------
      80
      11
       2

7. Proposals by Country

                       Requested
Country         #Prop       Time    w/Prob
------------------------------------------
BELGIUM           1       100.00    100.00
BRAZIL            2       230.00    230.00
CANADA            4       900.00    465.00
CHINA             4       805.00    805.00
FRANCE            6       668.00    548.00
GERMANY           7      1427.00   1413.00
HONG KONG         1        90.00     90.00
INDIA             1        60.00     60.00
ITALY            29      8119.70   7447.70
JAPAN             2       338.00    338.00
KOREA, SOUTH      1        60.00     60.00
NETHERLANDS       3       510.00    265.00
NORWAY            1       195.00    195.00
RUSSIA            3       260.00    260.00
TAIWAN            1        60.00     60.00
THAILAND          1        58.00     58.00
TURKEY            2       190.00    182.00
UNITED ARAB EMI   1        12.00      3.60
UNITED KINGDOM    9      1757.00   1692.00
USA             221     56748.85  54548.35


Total Foreign    79     15839.70  14272.30

             Approved
    #Prop         Time     w/Prob
    -----------------------------


        1       450.00     90.00

        1       150.00     30.00
        4       471.00    471.00


        8      1046.00   1031.00

        1        60.00     60.00
        1        20.00     10.00




        1        40.00     32.00
        1        12.00      3.60
        4      1015.00   1015.00
       86     14429.60  13036.30


       22      3264.00   2742.60

10.15 Monday, April 20, 2026
The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA. Email: cxchelp@cfa.harvard.edu Smithsonian Institution, Copyright © 1998-. All rights reserved.