053438.1-052423 This source lies near the detector edge.
053439.8-053007 This source lies 0.6" from JW 47 (I=13.8) and 3.5" from JW 49
053439.8-053007  (I=14.0). We associate the source with the closer star. 
053445.8-052454 The rotational period of this star may be either 1.5 
053445.8-052454  and 3.0 days.
053450.8-052925 Rotational periods of 0.75 and 0.43 days have been reported for 
053450.8-052925  this star.
053452.1-052231 Rotational periods of 8.35 and 8.83 days have been reported
053452.1-052231  for this star.
053452.6-052753 This source is 1.4" from JW137 (I=13.6) and 1.9" from JW136
053452.6-052753  (I=13.8). We assign the latter star as the counterpart, as
053452.6-052753  it has well-characterized properties.
053456.8-052136 Photometric variations are consistent with periods of 3.43 and
053456.8-052136  1.4 days.
053500.2-051850 The rotational period of this star may be either 1.54 
053500.2-051850  or 2.85 days.
053504.1-052627 Rotational periods of 9.46 and 8.73 days have been reported
053504.1-052627  for this star.
053504.1-052015 The stellar counterpart is source 053504.19-052012.1 (J=13.57,
053504.1-052015  H=13.94,K=11.70) from the second incremental release of the
053504.1-052015  2MASS catalog.
053504.5-052936 This source lies 0.5" from JW 256 (V=15.5) and 2.7" from
053504.5-052936  JW252 = P 1726 (V=13.2). We assign the counterpart to be the
053504.5-052936  brighter star, although it is more distant, recognizing that
053504.5-052936  this identificationis insecure. 
053505.6-052506 The rotational period of this star has been variously reported
053505.6-052506  as 0.95 and 20.1 days. In addition the period has not been
053505.6-052506  clearly identified with JW 275a or JW 275b. 
053506.2-051422 Two rotational periods have been reported for this star: 0.78
053506.2-051422  and 3.53 days.
053508.6-052022 This source may be associated with K-band source 1092 from Ali
053508.6-052022  & Depoy (1995, Cat. <J/AJ/109/709>) with 0.5" offset. However, 
053508.6-052022  this object may be a nebular knot ratherthan a star.
053510.4-052223 This star lies 3.7" from the star HC 466, too distant to be a
053510.4-052223  reliable identification.
053511.4-051401 This source lies near the detector edge.
053511.6-052729 This star lies 3.1" from the star CHS 8177, too distant to be
053511.6-052729  a reliable identification.
053512.2-052347 This source is associated with the close visual binary JW 378a
053512.2-052347  (I=12.9) and JW 378b (I=13.5). We set the identification to
053512.2-052347  the brighter, well-characterized component.
053512.2-052045 This source is associated with the visual binary JW 377a
053512.2-052045  (I=15.3) and JW 377b (I=16.3). We assign to brighter
053512.2-052045  component as the counterpart.
053512.8-052133 This source lies 0.2" from the K-band source HC 608, and
053512.8-052133  0.5" from HC 606. Neither star is well-characterized. We
053512.8-052133  assign the close star as the counterpart.
053512.8-051523 Two rotational periods for this star are reported: 7.78 and
053512.8-051523  9.06 days.
053513.0-052215 This is infrared "Source a". 
053513.1-052221 This source is associated with the visual binary JW 399, lying
053513.1-052221  0.5" from JW 399a (I=15.3) and 0.2" from JW 399b (I=16.8).
053513.1-052221  We select the brighter star as the counterpart. The system is
053513.1-052221  also known asinfrared "Source b". 
053513.2-052754 This source lies on a readout trail.
053513.2-052254 This star lies 2.3" from the star PSH 30, too distant to be a
053513.2-052254  reliable identification. 
053513.3-052352 This source lies 0.3" from star PSH 37 (I=17.3) and 0.8"
053513.3-052352  from star PSH 40 (I=17.7). Neither star is well-characterized. 
053513.3-052352  We assign the brighter star as the counterpart. 
053513.4-052354 This source lies 2.1" from star PSH 50 (I=17.7). Given the
053513.4-052354  near-axis location, this offset is too large to permit a
053513.4-052354  reliable identification and we list this source as unidentified
053513.4-052728 This source lies on a readout trail.
053513.5-052219 This is infrared "Source e".
053513.7-052221 This is infrared "Source g".
053513.8-052207 This is infrared "Source h".
053513.9-052229 This is one of the high-mass, high-luminosity 
053513.9-052229  (L_FIR_~1000L_{sun}_)deeply embedded stars in the BN/KL region.
053513.9-052229  Other designations include IRc 3-South and "Source i".
053514.0-052636 This source lies near a readout trail. This faint source lies
053514.0-052636  near a readout trail.
053514.0-052236 This star is known as infrared "Source k" and IRc 5-North.
053514.0-052222 This X-ray source is associated with the Becklin-Neugebauer
053514.0-052222  Object,which coincides with infrared sources IRc 1 and HC 705
053514.0-052222  and with radiosource B. The 1.1" offset between the ACIS
053514.0-052222  position and radioposition reported by Garmire et al. (2000,
053514.0-052222  Cat. <J/AJ/120/1426>) is now 0.6",consistent with a true
053514.0-052222  coincidence.
053514.3-052232 The counterpart of this source is the K-band star HC 448
053514.3-052232  and mid-infrared "Source n" which coincides with radio source L
053514.3-052232  and lies inthe middle of the far-infrared OMC Hot Core (OMC-1
053514.3-052232  FIR 2) of the BN/KLregion. The X-ray emission is highly
053514.3-052232  variable and has an unusual spectrum (see note accompanying
053514.3-052232  Table 3). It is not clear whether theACIS source is from the
053514.3-052232  deeply embedded high-mass star, a lightlyabsorbed lower-mass
053514.3-052232  star, or both.
053514.3-052232 This ACIS and K-band star (also known as infrared "Source p")
053514.3-052232  may alsobe associated with the strong mid-infrared source IRc
053514.3-052232  4 located about 1" away.
053514.4-052238 This X-ray source is clearly associated with radio source H
053514.4-052238  (offset 0.3") which is likely associated with the mid-infrared
053514.4-052238  source IRc5. The infrared position appears to be offset from
053514.4-052238  the radio source by 2", but it has not been measured 
053514.4-052238  accurately. H_2_O masers are alsopresent in the region. It 
053514.4-052238  seems likely that the X-ray, radio, infraredand maser sources 
053514.4-052238  are all associated with a hot massive deeply embedded star.
053514.6-052233 This is infrared "Source t".
053514.6-052042 This source is associated with the visual binary JW 445a
053514.6-052042  ({phi}=0.3", I=14.7) and JW 445b ({phi}=0.8", I=16.0).
053514.6-052042  We select the brighter component as the counterpart.
053514.7-052412 HST star 149-412 (O'Dell & Wong, 1996, Cat. <J/AJ/111/846>) lies
053514.7-052412  2.8" from this source, too far for a reliable identification at
053514.7-052412  this near-axis location in the field.
053514.7-052229 This source also lies 0.5" from the mid-infrared source IRc 11
053514.7-052229  (Gezari et al., 1998ApJ...509..283G). As the X-ray source is
053514.7-052229  unusually heavily absorbed andluminous, it is reasonable to
053514.7-052229  associate it with this high-luminosity embedded member of the
053514.7-052229  BN/KL cluster.
053514.8-052231 This is infrared "Source u".
053514.8-052304 This source lies 0.6" from star PSH 75 (I=16.4) and 0.6" from
053514.8-052304  star PSH 73 (I=17.8). Neither star is well-characterized. We
053514.8-052304  identify the brighter star as the counterpart.
053514.9-052239 This is infrared "Source v".
053514.9-052412 This source lies 0.5" from star PSH 79 (I=15.3) and 0.5" from 
053514.9-052412  the well-characterized star PSH 80 (I=14.9). We choose the 
053514.9-052412  brighter star as the counterpart.
053515.1-052229 This unidentified X-ray source lies 1.5" from IRc 14, a luminous
053515.1-052229  mid-infrared member of the BN/KL cluster (Gezari et al.,
053515.1-052229  1998ApJ...509..283G).
053515.3-052225 This source lies equidistant from three stars: PSH 96
053515.3-052225  ({phi}=0.9", I=15.3), JW 472a ({phi}=0.8", I=14.8) and JW 472b
053515.3-052225  ({phi}=0.8", I=15.1). None are well-characterized. We associate
053515.3-052225  the star with the brightest star JW 472a 
053515.3-052225  (= infrared "Source z") but recognize that this identification 
053515.3-052225  is very uncertain.
053515.3-052215 This is infrared "Source y".
053515.5-051738 This source is 1.2" from the well-characterized star JW 471
053515.5-051738  (I=15.5) and 2.0" from the poorly-characterized star JW 474
053515.5-051738  (I=16.1). We associate the source with the brighter star.
053515.8-052310 This star is {theta}^1^A Ori, spectral type O7.
053515.8-052322 This star is {theta}^1^H Ori, spectral type K.
053515.8-052301 There may be another source 1" SW of this source. The extracted
053515.8-052301  photons include both possible sources.
053515.9-052349 This star, designated {theta}^1^E Ori, is a close binary
053515.9-052349 withcomponents [SCB99] 102 (K=8.50) and [SCB99] 104 (K=9.25)
053515.9-052349 (Simon et al., 1999, Cat. <J/AJ/117/1375>). The offsets from the
053515.9-052349 X-ray position are 0.8"and 0.6", respectively.
053515.9-052319 This X-ray source coincides with a SIMBAD listing for Parenago
053515.9-052319  1867 (V=15.8). However, examination of the original charts of
053515.9-052319  Parenago (1954TrSht..25....1P) indicates that the SIMBAD
053515.9-052319  position is probably incorrect: Parenago 1867 corresponds to
053515.9-052319  HC 304 ~= 3" to the south. The X-ray position is resolvable 
053515.9-052319  from other stars in the region and has no counterpart with V<20
053515.9-052319  or K<18.
053516.0-052353 This source may be a partially resolved double with components
053516.0-052353  0.5" NW and SE of the stated position. It is also near a
053516.0-052353  readout trail.
053516.0-052307 This source lies 0.7" from P 1863a (I=7.3) and 0.6" from P 1863b
053516.0-052307  (I=11). We associate the source with the more luminous and
053516.0-052307  massive star, which is also designated {theta}^1^B Ori,
053516.0-052307  massive star, spectral type B0.
053516.0-052036 This source lies 0.7" from JW 504a (I=13.6) and 0.6" from 
053516.0-052036  JW 504b (I=13.6). We choose the latter star as the counterpart 
053516.0-052036  because it is well-characterized.
053516.1-052456 This source lies 0.8" from JW 509a (I=15.1) and 1.3" from 
053516.1-052456  JW 509b (I=15.7). We associate the source with the brighter, 
053516.1-052456  nearer and well-characterized star.
053516.2-052210 This source is 1.1" from JW 511a (I=15.7) and 0.7" from JW 511b
053516.2-052210  (I=18.0). We choose the brighter and well-characterized
053516.2-052210  (I=18.0). We star as the counterpart.
053516.4-052322 This star is {theta}^1^C Ori, spectral type O6 and is the
053516.4-052322  dominant X-ray source of the ONC.
053516.4-052235 This source lies 0.3" from JW 519a (I=14.3) and 0.8" from 
053516.4-052235  JW 519b (I=17.5). We associate the source with the brighter and
053516.4-052235  nearer star.
053516.6-052316 This may be a slightly resolved double X-ray source with a
053516.6-052316  component 0.8" ENE of the listed position.
053516.7-052231 This faint source lies near a readout trail.
053516.7-052316 This star is {theta}^1^G Ori, spectral type unknown.
053516.7-052404 This source is 0.4" from JW 526a (I=11.9) and 0.3" from JW 526b
053516.7-052404  (I=13.4). We consider the brighter, well-characterized stars
053516.7-052404  to be the counterpart.
053516.9-052222 This source lies directly on a readout trail.
053517.0-052233 This source lies near a readout trail.
053517.2-052316 This star is {theta}^1^D Ori, spectral type B0.5.
053517.5-052106 This source lies 0.6" from JW 551a (I=13.9) and 0.5" from 
053517.5-052106  JW 551b (I=14.4). We choose the brighter and well-characterized
053517.5-052106  star as the counterpart. This faint source lies directly on a 
053517.5-052106  readout trail.
053517.5-052145 This source is 0.8" from JW 552a (I=14.5) and 0.8" from JW552b
053517.5-052145  (I=16.0). We select the brighter and well-characterized star
053517.5-052145  as the counterpart.
053517.5-052256 This source lies 0.7" from JW 553a (I=12.4) and 1.0" from JW553b
053517.5-052256  (I=14.9). We associate the source with the nearer, brighter and
053517.5-052256  well-characterized star.
053517.9-052533 This source lies 0.7" from JW 570a (I=14.7) and 0.6" from 
053517.9-052533  JW 570b (I=15.3). We associate the source with the brighter and
053517.9-052533  well-characterized star. The proplyd is associated with the
053517.9-052533  well-characte companion JW 570b.
053517.9-052335 This source is 0.4" from star PSH 206 (I=16.2) and 0.5" from
053517.9-052335  star PSH 208 (I=15.9). We arbitrarily associate the source
053517.9-052335  with PSH 208, recognizing that the identification is very
053517.9-052335  uncertain.
053518.2-053144 The rotational period of this star is variously reported at
053518.2-053144  13.82 and 11.05 days.
053518.3-052426 This source is 0.4" from star PSH 224 (I=15.2) and 0.1"
053518.3-052426  from star PSH 222 (I=16.1). We associate the source with the
053518.3-052426  brighter and well-characterized star.
053518.5-051637 This source lies 1.3" from JW 593 (I=11.5) and 2.6" from JW 593
053518.5-051637  (I=13.7). We associate the source with the nearer and brighter
053518.5-051637  source; the large offset is consistent with the large off-axis
053518.5-051637  distance.
053518.5-052232 This star lies 1.2" from the star PSH 231, which we believe
053518.5-052232  is too distant to be a reliable identification.
053518.5-051820 The source is near a readout trail.
053518.7-051905 This star lies 3.4" from the star CHS 9197, too distant to be
053518.7-051905  a reliable identification.
053518.8-052222 This source lies 1.3" from star PSH 241 (I=16.8) and 1.0"
053518.8-052222  from star PSH 239 (I=17.5). We tentatively associate the
053518.8-052222  source with the brighter source, recognizing that the offset
053518.8-052222  is high.
053519.6-051702 The source near a readout trail.
053519.7-052110 This star lies 2.7" from the star JW 623, too distant to be a
053519.7-052110  reliable identification.
053519.9-051535 The source is near a readout trail. This far off-axis X-ray
053519.9-051535  source is near both the K-band source CHS 9333 and the bright
053519.9-051535  OMC-2 sub-millimeter source 33 (Lis et al., 
053519.9-051535  1998ApJ...509..299L). Identification with the deeply embedded 
053519.9-051535  source is not favorable, both because of the large offset (6") 
053519.9-051535  and the lack of strong absorption in the X-ray spectrum.
053520.0-052537 Photometric variations for this star are consistent with
053520.0-052537  periods of 5.59 and 11.3 days.
053520.4-052329 This source is 0.5" from JW 648a (I=13.2) and 0.2" from JW 648b
053520.4-052329  (I=14.6). We associate the source with the brighter
053520.4-052329  well-characterized star.
053520.4-051714 There may be a nearby faint source 3" to the NE in the point
053520.4-051714  spread function wings of this strong source.
053520.9-053121 Two very different rotational periods have been reported for
053520.9-053121  this star: 1.44 and 10.68 days.
053521.3-052345 This source is 0.2" from JW 681a (I=13.0) and 1.0" from JW 681b
053521.3-052345  (I=16.4). We associate the source with the brighter, nearer and
053521.3-052345  well-characterized star.
053521.6-052147 This source is 0.4" from JW 687a (I=14.7) and 0.5" from JW 687b
053521.6-052147  (I=17.3). We associate the source with the brighter and
053521.6-052147  (I=17.3). We well-characterized star.
053522.0-051703 This source is 2.0" from JW 696a (I=14.1) and 1.6" from JW 696b
053522.0-051703  (no available photometry). We associate the source with 
053522.0-051703  JW 696a, recognizing that the identification is quite insecure.
053522.0-051428 This source lies near the detector edge.
053522.3-052414 Photometric periods of 7.53 and 1.15 days have been reported
053522.3-052414  for this star.
053522.8-052457 This star is {theta}^2^A Ori, spectral type O9.5.
053523.5-052002 This source is just resolved from the fainter source
053523.5-052002  053523.4-052001 lying 1.5" to the NW.
053523.6-052212 A faint companion ({~=} 1 photons) may be present 2.5" SW of 
053523.6-052212  this bright source.
053524.1-052133 This source is 0.2" from JW 748a (I=14.8) and 0.4" from JW 748b
053524.1-052133  (I=16.0). We associate the source with the brighter
053524.1-052133  (I=16.0). We well-characterized star.
053524.3-052232 There may be a faint companion source 1.5" to the NW which, if
053524.3-052232  real, may be associated with 2MASS star CHS 9925 ({phi}=1.3").
053525.0-052258 This source is 0.7" from JW 766a (I=13.7) and 0.6" from JW 766b
053525.0-052258  (I=13.9). We associate the source with the slightly brighter
053525.0-052258  and well-characterized star, recognizing that the companion may
053525.0-052258  well be a significant contributor.
053525.4-052152 This source is 0.6" from JW 776a (I=14.2) and 0.8" from JW 776b
053525.4-052152  (I=15.9). We associate the source with the brighter and
053525.4-052152  better-characterized star.
053525.5-053021 This source is 1.5" from JW 787 (I=12.7) and 2.3" from JW 784
053525.5-053021  (I=12.9). We associate the source with the closer and
053525.5-053021  (I=12.9). We well-characterized star, recognizing that the 
053525.5-053021  identification (I=12.9). We is quite insecure. Its rotational 
053525.5-053021  period has been reported to (I=12.9). We be 7.74 days 
053525.5-053021  and 9.91 days.
053525.9-052548 This source lies 0.6" from JW 792 (I=13.6) and 0.7" from
053525.9-052548  star HC 7 (no photometry available). We associate the source
053525.9-052548  with the better characterized star JW 792.
053526.1-052737 Photometric rotational periods of 1.55 and 2.81 days have been
053526.1-052737  reported.
053526.4-052500 This star is {theta}^2^B Ori, spectral type B1.
053526.5-051757 This source may be a slightly resolved double with the
053526.5-051757  secondary component located 4" NE of the listed position.
053527.5-051710 This source lies 1.2" from JW 811a (I=13.4) and 1.6" from JW
053527.5-051710  811b (no photometry available). We associate the source with
053527.5-051710  the well-characterized star JW 811a.
053527.8-051804 The rotational period of this star has variously been reported
053527.8-051804  to be 2.29 and 3.57 days.
053528.0-051657 Photometric periods of 1.21 and 5.76 days have been reported
053528.0-051657  for this star.
053529.5-051633 Rotational periods of 8.69 and 10.6 days have been reported
053529.5-051633  for this star.
053529.5-053114 Discrepant photometric periods of 0.84 and 5.38 days have been
053529.5-053114  found for this star.
053529.9-053252 This source is truncated by the detector edge.
053531.4-052516 This star is {theta}^2^C Ori, spectral type B4.
053531.6-051637 This source is 2.1" from JW 870 (I=15.2) and 2.4" from JW 875
053531.6-051637  (I=15.9). We associate the source with the brighter star.
053531.7-052934 The photometric data for this star are consistent with periods
053531.7-052934  of 1.58 and 3.51 days.
053533.0-051605 This source lies 2.2" from JW 892 (I=14.0) and 2.5" from
053533.0-051605  star 3018 (I=14.3). We associate the source with the closer,
053533.0-051605  brighter and well-characterized star.
053533.1-051734 This PSF appears to have an excess of ~20 events 8" to
053533.1-051734  the SW around 83.88683-05.29456. This may be emission from
053533.1-051734  the star JW 891.
053538.2-052835 This source lies 1.5" from JW 936 (I=14.8) and 3.6" from JW 934
053538.2-052835  (I=15.8). We associate the source with the closer and
053538.2-052835  (I=15.8). We brighter star.
053543.6-052047 This source lies 1.4" from star CHS 11919 (K=12.8) and 3.6"
053543.6-052047  from star CHS 11933 (K=13.2). We associate the source with
053543.6-052047  the closer and brighter star.
053545.3-052812 Highly discrepant photometric periods of 0.19 and 7.15 days
053545.3-052812  have been reported for this star.