Source List

Observation details report
Detailed source parameters (including errors) in a comma-separated values file

Click on source number for detailed analysis, including spectral fits if applicable

data idnum idradec telescope instrument x y cnts cntserr rate rateerr SNR poisprob sigmaj sigmin incang offax cnts_soft cnts_hard hr hr_err ext var N_H flux vign flags
Report srcpi bgdpi arf rmf 8 X225903.66-605929.6 chandra ccd3 708.401 250.025 559.846 23.9447 0.00867936 0.000371218 189.489 1 0.529947 0.529947 0 1.33008 F F 1.95e+20 1.01079e-13 1 dsxf
Report srcpi bgdpi arf rmf 6 X230015.74-610455.1 chandra ccd6 771.934 1026.64 639.901 28.1699 0.00992145 0.000436765 68.2454 1 5.91197 5.91197 0 10.3947 F F 1.98e+20 1.33677e-13 1 dsxf
Report srcpi bgdpi arf rmf 31 X225838.61-610736.8 chandra ccd2 895.548 280.7 338.037 19.5018 0.00524089 0.000302353 101.216 1 2.51674 2.51674 0 7.37592 F F 1.95e+20 9.48146e-14 1 dsxf
Report srcpi bgdpi arf rmf 15 X225801.17-605700.8 chandra ccd1 594.331 371.049 232.56 16.3914 0.00360541 0.000254118 44.9133 1 2.50151 2.50151 0 7.73377 F F 1.93e+20 7.71298e-14 1 dsxf
Report srcpi bgdpi arf rmf 3 X225909.15-610423.7 chandra ccd2 445.645 673.183 149.032 12.5311 0.00231058 0.00019428 44.6235 1 0.907001 0.66881 238.986 4.03918 F F 1.96e+20 2.99696e-14 1 dsx
Report srcpi bgdpi arf rmf 2 X225836.39-605751.1 chandra ccd3 1111.86 450.053 116.499 10.7935 0.0018061 0.000167332 39.431 1 0.704332 0.704332 0 3.77248 F F 1.94e+20 2.14693e-14 1 dsx
Report srcpi bgdpi arf rmf 10 X225835.44-610223.4 chandra ccd2 943.126 917.631 100.362 10.3084 0.001556 0.00015982 30.0506 1 0.707358 0.707358 0 3.22562 F F 1.94e+20 2.16985e-14 1 dsx
Report srcpi bgdpi arf rmf 6 X225900.85-610332.7 chandra ccd2 567.5 776.5 100.62 10.0995 0.00156 0.000156582 30.1278 1 0.492 0.492 90 2.96539 F F 1.95e+20 2.06638e-14 1 dx
Report srcpi bgdpi arf rmf 21 X225824.55-610816.3 chandra ccd2 1101.84 199.61 100.453 11.2696 0.00155741 0.000174723 30.0778 1 3.99817 2.90717 153.598 8.64688 F F 1.94e+20 2.2395e-14 1 dx
Report srcpi bgdpi arf 1 X225902.79-610734.3 chandra ccd2 539.589 285.924 45.3631 8.9263 0.000703306 0.000138393 13.5827 1 0.930976 0.930976 0 6.99729 F F 1.95e+20 1.02037e-14 1 dsx
Report srcpi bgdpi arf 4 X225845.34-605529.4 chandra ccd3 979.523 738.116 88.6598 9.68269 0.0013745 0.000150112 30.0083 1 0.906243 0.906243 0 5.32625 F F 1.95e+20 1.71416e-14 1 dsx
Report srcpi bgdpi arf 1 X225823.78-610122.4 chandra ccd0 82.4153 866.202 92.0584 9.73831 0.00142726 0.000150982 13.2331 1 1.13936 1.13936 0 4.17235 F F 1.94e+20 1.86235e-14 1 dsx
Report srcpi bgdpi arf rmf 2 X225802.91-605944.6 chandra ccd0 391.384 1064.13 210.551 14.9702 0.00326436 0.000232096 30.2659 1 2.39638 2.39638 0 6.68089 F F 1.93e+20 5.08647e-14 1 dsxf
Report srcpi bgdpi arf 5 X225912.84-605505.4 chandra ccd3 572.096 786.901 99.7741 10.8303 0.00154681 0.000167903 33.7701 1 0.950657 0.950657 0 5.81697 F F 1.95e+20 2.14695e-14 1 dsx
Report srcpi bgdpi arf rmf 1 X225958.81-610547.5 chandra ccd6 1021.91 921.232 111.168 11.5483 0.00172362 0.000179053 11.8561 1 4.47364 4.47364 0 9.03967 F F 1.97e+20 2.48005e-14 1 dsx
Report srcpi bgdpi arf 2 X225849.82-610601.0 chandra ccd2 730.598 475.472 68.7369 9.31788 0.00106569 0.000144464 20.5814 1 0.984898 0.984898 0 5.4935 F F 1.95e+20 1.40208e-14 1 dsx
Report srcpi bgdpi arf 8 X225833.27-610234.3 chandra ccd2 975.008 895.296 76.8562 8.84742 0.00119157 0.00013717 23.0125 1 0.890111 0.890111 0 3.5451 F F 1.94e+20 1.41983e-14 1 dsx
Report srcpi bgdpi arf 6 X225945.01-605440.0 chandra ccd3 95.1926 837.672 36.8038 8.28444 0.000570573 0.000128435 12.4568 1 1.1464 1.1464 0 8.2645 F F 1.96e+20 8.64104e-15 1 dsx
Report srcpi bgdpi arf 13 X225927.79-610210.0 chandra ccd2 170.188 944.565 65.7703 8.7848 0.0010197 0.000136199 19.6931 1 0.733165 0.733165 0 3.97236 F F 1.96e+20 1.39533e-14 1 dsx
Report srcpi bgdpi arf 7 X225838.20-610238.5 chandra ccd2 902.323 886.95 91.0673 9.97376 0.0014119 0.000154632 27.2676 1 0.625965 0.625965 0 3.11251 F F 1.94e+20 1.71276e-14 1 dsx
Report srcpi bgdpi arf 2 X225801.84-605645.3 chandra ccd1 584.588 402.57 93.0328 9.64535 0.0014423 0.000149533 17.967 1 3.15509 3.15509 0 7.79451 F F 1.93e+20 1.8897e-14 1 dsx
Report srcpi bgdpi arf 14 X225853.64-610204.0 chandra ccd2 674.433 957.295 69.6302 8.79439 0.00107954 0.000136347 20.8488 1 0.545494 0.366896 136.482 1.53912 F F 1.95e+20 1.28167e-14 1 dsx
Report srcpi bgdpi arf 3 X225851.71-605719.6 chandra ccd3 885.144 514.185 63.8842 8.46207 0.000990405 0.000131188 21.6226 1 0.480016 0.480016 0 3.35516 F F 1.95e+20 1.24209e-14 1 dsx
Report srcpi bgdpi arf 5 X230002.01-610642.8 chandra ccd6 974.69 808.119 63.3088 10.0501 0.000981581 0.000155824 6.75188 1 2.29181 1.77354 117.464 9.89833 F F 1.97e+20 1.37161e-14 1 dx
Report srcpi bgdpi arf 1 X225930.37-605813.1 chandra ccd3 313.09 405.123 63.4091 7.96298 0.000983039 0.000123451 21.4618 1 0.813009 0.813009 0 4.63039 F F 1.96e+20 1.36278e-14 1 dsx
Report srcpi bgdpi arf 7 X225908.64-605328.0 chandra ccd3 634.264 984.986 50.3632 8.5322 0.000780786 0.000132276 17.0462 1 1.60867 1.60867 0 7.26205 F F 1.95e+20 1.07533e-14 1 dsx
Report srcpi bgdpi arf rmf 3 X225747.50-610544.6 chandra ccd0 615.999 331.487 116.871 13.4944 0.00181196 0.000209216 16.7998 1 4.80844 4.80844 3.81925 9.93773 F F 1.93e+20 2.70486e-14 1 dsx
Report srcpi bgdpi arf 11 X225738.10-605633.8 chandra ccd1 935.688 423.969 58.9325 9.7982 0.000913639 0.000151903 11.3814 1 5.71893 3.23821 28.8124 10.4595 A F 1.92e+20 1.32174e-14 1 dx
Report srcpi bgdpi arf 27 X225851.78-605942.9 chandra ccd3 883.922 223.07 58.8122 7.85967 0.000911773 0.000121849 19.9059 1 0.444431 0.444431 0 1.13786 F F 1.95e+20 1.0714e-14 1 dsx
Report srcpi bgdpi arf 20 X225847.84-610850.8 chandra ccd2 759.565 130.399 57.1452 9.9286 0.000885974 0.000153932 17.1105 1 2.54894 2.54894 0 8.33603 F F 1.95e+20 1.32961e-14 1 dsx
Report srcpi bgdpi arf 12 X225904.10-605616.1 chandra ccd3 701.625 643.441 50.1653 7.39018 0.000777719 0.000114571 16.9792 1 0.716061 0.716061 0 4.40721 F F 1.95e+20 9.75527e-15 1 dsx
Report srcpi bgdpi arf 10 X225728.70-605638.1 chandra ccd1 1075.29 414.835 58.8333 10.9897 0.000912102 0.000170376 11.3622 1 5.78806 5.78806 0 11.4895 F F 1.92e+20 1.37314e-14 1 dsx
Report srcpi bgdpi arf 26 X225931.32-610502.5 chandra ccd2 118.821 593.885 24.5402 5.87279 0.000380469 9.10511e-05 7.34788 1 1.45077 0.771751 229.955 6.02121 A F 1.96e+20 5.42257e-15 1 dsx
Report srcpi bgdpi arf 14 X225816.61-605244.6 chandra ccd1 367.097 892.481 16.2774 7.15059 0.000252351 0.000110857 3.14359 0.998575 2.5501 2.5501 0 9.30485 F F 1.94e+20 3.604e-15 1 dsx
Report srcpi bgdpi arf 12 X225746.71-605444.2 chandra ccd1 809.582 647.72 16.8562 9.01572 0.000261324 0.000139772 3.25537 0.998575 1.86937 1.86937 0 10.4452 F F 1.93e+20 3.8584e-15 1 dsx
Report srcpi bgdpi arf 3 X225814.91-605628.6 chandra ccd1 391.067 437.15 32.1126 5.6668 0.000497847 8.78533e-05 6.20177 1 2.03957 2.03957 0 6.6299 F F 1.94e+20 6.55266e-15 1 dsx
Report srcpi bgdpi arf 9 X225802.99-605456.2 chandra ccd1 568.3 624.297 39.489 6.28403 0.000612204 9.74223e-05 7.62634 1 4.97715 3.51533 328.521 8.71883 F F 1.93e+20 8.26389e-15 1 dsx
Report srcpi bgdpi arf 25 X225947.25-605407.9 chandra ccd3 61.3379 902.365 24.9923 6.08291 0.000387459 9.43041e-05 8.45905 1 4.05739 2.52458 36.8146 8.84201 A F 1.96e+20 6.01127e-15 1 dx
Report srcpi bgdpi arf 4 X230044.67-611000.3 chandra ccd6 349.167 403.333 24.6017 7.74634 0.00038144 0.000120104 2.62376 0.994279 2.15528 1.88559 78.6488 15.9917 F F 1.99e+20 5.77057e-15 1 dx
Report srcpi bgdpi arf 26 X225904.34-605334.1 chandra ccd3 697.537 972.167 21.9456 5.19621 0.000340225 8.05575e-05 7.42784 1 2.06196 0.968181 52.1818 7.08407 A F 1.95e+20 4.62121e-15 1 dx
Report srcpi bgdpi arf 19 X225926.71-605423.7 chandra ccd3 365.944 870.907 21.2431 5.19622 0.000329335 8.05576e-05 7.19008 1 1.9908 1.48501 62.691 7.14256 F F 1.96e+20 4.63979e-15 1 dx
Report srcpi bgdpi arf 18 X225938.71-605434.9 chandra ccd3 188.056 847.685 21.24 5.19622 0.000329287 8.05576e-05 7.18903 1 2.02605 1.12902 50.6209 7.81846 A F 1.96e+20 4.85031e-15 1 dx
Report srcpi bgdpi arf 25 X225827.23-610507.4 chandra ccd2 1063.18 583.636 20.5529 4.69043 0.000318649 7.27199e-05 6.15399 1 0.691505 0.545631 127.224 5.82644 F F 1.94e+20 4.08059e-15 1 dx
Report srcpi bgdpi arf 13 X225751.07-605408.5 chandra ccd1 745.301 720.527 22.9699 8.09643 0.000356105 0.00012552 4.43608 0.99996 3.51188 3.51188 0 10.3304 F F 1.93e+20 5.43601e-15 1 dsx
Report srcpi bgdpi arf 24 X225908.73-610552.7 chandra ccd2 451.5 491.833 18.8724 4.5826 0.000292596 7.10481e-05 5.65083 0.999999 0.621947 0.492 35.7825 5.44171 F F 1.96e+20 4.04863e-15 1 dbx
Report srcpi bgdpi arf 15 X225943.63-605642.6 chandra ccd3 115.955 587.909 18.7738 4.69046 0.000291053 7.27168e-05 6.3543 1 1.41032 0.935496 90.9842 6.80359 A F 1.96e+20 4.20664e-15 1 dx
Report srcpi bgdpi arf 16 X225935.62-605526.3 chandra ccd3 234.091 743.364 18.7197 4.69045 0.000290214 7.27167e-05 6.33598 1 1.38806 1.04548 85.8283 6.92386 F F 1.96e+20 4.21796e-15 1 dbx
Report srcpi bgdpi arf 22 X225909.68-610760.0 chandra ccd2 438.184 233.647 19.2486 4.94388 0.000298428 7.66493e-05 5.76346 0.999999 1.23662 1.23662 0 7.53131 F F 1.96e+20 4.37246e-15 1 dsx
Report srcpi bgdpi arf 24 X225842.26-605456.2 chandra ccd3 1025.27 805.721 7.29336 4.85806 0.00011307 7.53151e-05 2.46855 0.991558 0.668617 0.668617 0 5.97195 F F 1.94e+20 1.43171e-15 1 dsx
Report srcpi bgdpi arf 1 X225818.84-605931.1 chandra ccd1 331.993 66.3947 20.4866 4.67627 0.000317607 7.2497e-05 3.95649 0.999857 1.26158 1.26158 0 4.82756 F F 1.94e+20 3.84635e-15 1 dsx
Report srcpi bgdpi arf 18 X225929.46-610131.4 chandra ccd2 145.459 1023.11 30.6286 5.57738 0.000474863 8.64713e-05 9.17089 1 1.00913 1.00913 0 3.95297 F F 1.96e+20 9.00762e-15 1 dsx
Report srcpi bgdpi arf 11 X225926.21-605744.9 chandra ccd3 374.597 462.411 16.6548 4.67774 0.000258202 7.25197e-05 5.63708 0.999998 0.605879 0.605879 0 4.49176 F F 1.96e+20 3.55139e-15 1 dsx
Report srcpi bgdpi arf 16 X225924.81-610144.9 chandra ccd2 214.146 995.809 16.2572 4.70444 0.00025205 7.29372e-05 4.86777 0.999984 0.6484 0.6484 0 3.48611 F F 1.96e+20 3.35076e-15 1 dsx
Report srcpi bgdpi arf 4 X225932.69-610410.4 chandra ccd2 98.3577 699.748 15.9305 4.6789 0.000246986 7.25414e-05 4.76995 0.999984 0.706336 0.706336 0 5.54269 F F 1.96e+20 3.47376e-15 1 dsx
Report srcpi bgdpi arf 15 X225914.10-610148.7 chandra ccd2 372.313 988.159 14.5733 4.56636 0.000225944 7.07966e-05 4.36357 0.999898 0.692795 0.692795 0 2.33501 F F 1.96e+20 2.88223e-15 1 dsx
Report srcpi bgdpi arf 12 X225913.53-610215.4 chandra ccd2 380.768 933.925 16.2175 4.0271 0.000251434 6.24356e-05 4.85588 0.999984 0.683422 0.683422 0 2.53496 F F 1.96e+20 3.21487e-15 1 dsx
Report srcpi bgdpi arf 14 X225934.61-605848.7 chandra ccd3 250.622 332.553 14.059 4.41389 0.000217959 6.84292e-05 4.75849 0.999957 0.867248 0.867248 0 4.8302 F F 1.96e+20 2.95963e-15 1 dsx
Report srcpi bgdpi arf 17 X225845.71-605521.7 chandra ccd3 973.562 753.312 14.2384 4.00003 0.00022074 6.20129e-05 4.81922 0.999957 0.895235 0.63377 49.5933 5.43861 F T 1.95e+20 2.76562e-15 1 dx
Report srcpi bgdpi arf 29 X225825.12-610650.5 chandra ccd2 1094.23 374.436 29.9944 5.47671 0.000465031 8.49105e-05 8.98099 1 2.83458 2.83458 0 7.33225 F F 1.94e+20 6.32538e-15 1 dsx
Report srcpi bgdpi arf 10 X225853.06-605808.3 chandra ccd3 865.065 415.4 13.2079 4.51664 0.000204763 7.00218e-05 4.47043 0.999885 0.424566 0.424566 0 2.52633 F F 1.95e+20 2.42464e-15 1 dsx
Report srcpi bgdpi arf 23 X225907.55-610600.7 chandra ccd2 469.274 476.062 15.6502 4.47164 0.000242639 6.93277e-05 4.68602 0.999959 1.83077 0.422998 59.118 5.53272 A F 1.96e+20 3.38739e-15 1 dsx
Report srcpi bgdpi arf 5 X225859.78-610402.4 chandra ccd2 583.723 716.526 13.7336 4.44727 0.000212925 6.89502e-05 4.11215 0.999757 1.0594 0.408851 60.6899 3.4477 F F 1.95e+20 2.8579e-15 1 dsx
Report srcpi bgdpi arf 7 X225815.75-605544.0 chandra ccd1 378.375 527.375 11.8502 4.00006 0.000183715 6.20136e-05 2.28858 0.984135 1.85463 1.03267 118.24 7.0394 A F 1.94e+20 2.43412e-15 1 dx
Report srcpi bgdpi arf 21 X225900.16-605736.1 chandra ccd3 759.611 480.222 11.6045 4.24273 0.000179907 6.57756e-05 3.92775 0.999703 0.646883 0.492 33.1276 3.01863 F F 1.95e+20 2.31359e-15 1 dbx
Report srcpi bgdpi arf 13 X225845.23-605611.3 chandra ccd3 981.075 653.097 10.768 3.28147 0.000166938 5.0873e-05 3.6446 0.999264 0.692926 0.692926 0 4.66598 F F 1.95e+20 2.04505e-15 1 dsx
Report srcpi bgdpi arf 9 X225833.59-605916.9 chandra ccd3 1152.94 275.686 9.75375 3.1231 0.000151214 4.84178e-05 3.30131 0.998258 0.95786 0.389661 339.631 3.19564 A F 1.94e+20 1.77779e-15 1 dsx
Report srcpi bgdpi arf 27 X225917.44-610408.9 chandra ccd2 322.773 702.682 9.92439 3.31664 0.000153867 5.14208e-05 2.97158 0.997348 1.08837 0.492 123.358 4.27892 A F 1.96e+20 2.1195e-15 1 dx
Report srcpi bgdpi arf 22 X225900.24-605733.8 chandra ccd3 758.333 485 8.83522 3.87308 0.000136973 6.00448e-05 2.99042 0.99607 0.492 0.492 142.466 3.05868 F F 1.95e+20 1.76267e-15 1 dx
Report srcpi bgdpi arf 23 X225935.33-605553.0 chandra ccd3 238.5 689.227 8.24612 3.31667 0.000127841 5.14188e-05 2.79103 0.991558 1.67407 0.902328 78.6477 6.57438 A F 1.96e+20 1.85357e-15 1 dx
Report srcpi bgdpi arf 19 X225910.08-610117.1 chandra ccd2 431.167 1052.06 8.12993 3.00002 0.000126045 4.65119e-05 2.43428 0.989343 0.501838 0.492 164.518 1.65377 F F 1.95e+20 1.54552e-15 1 dx
Report srcpi bgdpi arf 30 X225820.31-610822.9 chandra ccd2 1164.21 185.928 7.62357 3.74184 0.000118195 5.8013e-05 2.28267 0.979968 2.84559 1.58319 108.042 8.99153 A F 1.94e+20 3.21654e-15 1 dx
Report srcpi bgdpi arf 11 X225900.07-610217.1 chandra ccd2 579 930.125 7.37196 2.82844 0.000114294 4.38518e-05 2.20733 0.979968 0.492 0.492 76.4747 1.70571 F F 1.95e+20 1.37819e-15 1 dx
Report srcpi bgdpi arf 9 X225907.06-610226.3 chandra ccd2 475.75 911.375 7.34995 2.82844 0.000113953 4.38518e-05 2.20074 0.979968 0.492 0.492 29.8718 2.16018 F F 1.95e+20 1.60269e-15 1 dx
Report srcpi bgdpi arf 17 X225849.43-610134.1 chandra ccd2 736.125 1017.5 7.01459 2.82845 0.000108753 4.38519e-05 2.10033 0.979968 0.795759 0.492 39.7984 1.38377 A T 1.95e+20 1.27851e-15 1 dx
Report srcpi bgdpi arf 5 X225800.33-610303.2 chandra ccd0 428.114 660.292 25.077 7.08354 0.000388791 0.000109822 3.60473 0.999627 1.37449 1.37449 0 7.36273 F F 1.93e+20 5.13291e-15 1 dsx
Report srcpi bgdpi arf 6 X225823.31-610209.5 chandra ccd0 89.2428 770.448 13.5143 3.96441 0.000209524 6.14638e-05 1.94263 0.966381 0.904594 0.904594 0 4.43639 F F 1.94e+20 2.58545e-15 1 dsx
Report srcpi bgdpi arf 7 X225806.38-610035.5 chandra ccd0 339.756 960.806 28.879 7.16764 0.000447736 0.000111126 4.15125 0.999945 1.60083 1.60083 0 6.20576 F F 1.93e+20 5.67471e-15 1 dsx
Report srcpi bgdpi arf 9 X225811.82-610754.8 chandra ccd0 256.804 68.1519 30.1568 8.61964 0.000467548 0.000133638 4.33493 0.999967 3.4158 3.4158 0 9.15465 F F 1.94e+20 7.34221e-15 1 dsx
Report srcpi bgdpi arf 10 X225751.37-610727.3 chandra ccd0 557.459 122.663 45.3077 8.06243 0.000702447 0.000124999 6.51282 1 2.31515 1.43761 127.749 10.5416 A F 1.93e+20 1.10099e-14 1 dx
Report srcpi bgdpi arf 11 X225727.37-610715.2 chandra ccd0 911.466 145.843 81.4725 13.3598 0.00126314 0.000207128 11.7114 1 5.36323 5.36323 0 12.758 F F 1.92e+20 4.71778e-14 1 dsx
Report srcpi bgdpi arf rmf 14 X225725.86-610348.5 chandra ccd0 936.225 565.988 1186.41 36.735 0.018394 0.000569537 170.542 1 6.35623 5.34534 2.83579 11.5469 F F 1.92e+20 3.00993e-13 1 dsx

counts and rate are bgd.-subtracted, based on simple spatial fitting (if done) or extracted counts from aperture otherwise (N.B., in either case aperture counts are given csv file).
cntserr, rateerr = Error on (source) counts and count rate, based on error in total counts
SNR = signal-to-noise ratio, computed using Nsrc/sqrt(Nbgd)
poisprob = Poisson probability of observing total counts given bgd. counts
sigmaj, sigmin = source extent (from detection output or spatial fitting) in units of arcsecs.
incang = position angle of source (inclination from x-axis)
cnts_soft = bgd.-subtracted counts in soft band (0.50 - 2.00 KeV, always taken directly from source aperture rather than model fitting)
cnts_hard = bgd.-subtracted counts in hard band (2.00 - 7.99 KeV, always taken directly from source aperture rather than model fitting)
hr, hr_err = hardness ratio ([cnts_hard-cnts_soft]/[cnts_hard+cnts_soft]) and error
ext = source extension flag: F = false (not extended), T = true (extended), A = asymetric (ratio of sigmaj/sigmin > 1 + x, where x = 0.5 by default)
var = variability flag: U = unknown, F = false (is not variable), T = true
N_H = Galactic column density as determined from LHEASOFT nh program
flux = flux determined from count rate using pimms (in the 0.30-8.00 keV bandpass for a power-law model with ph. index = 1.8)
vign = vignetting correction
Flags: d = detection parameters, s = simple spatial fitting parameters, b = simple spatial fitting failed, p = poor simple spatial fit, x = extracted events parameters, t = temporal anaylsis parameters, i = psf spatial fitting parameters, f = spectral fitting parameters, c = source is confused, u = user-defined source, v = detected source coincident with user-defined source, r = source is in region-of-interest