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 | 1 | X023821.69-494653.1 | chandra | ccd6 | 222.042 | 935.565 | 256.816 | 22.2557 | 0.00648493 | 0.000561985 | 16.6294 | 1 | 10.6025 | 10.6025 | 0 | 14.7948 | F | F | 2.55e+20 | 1.01224e-13 | 1 | dsxf | ||||
| Report | srcpi bgdpi arf rmf | 27 | X023712.44-494059.9 | chandra | ccd3 | 516.602 | 169.325 | 104.768 | 10.6166 | 0.00264531 | 0.000268061 | 50.8275 | 1 | 0.596712 | 0.4017 | 348.976 | 2.53775 | F | F | 2.55e+20 | 3.65323e-14 | 1 | dsxf | ||||
| Report | srcpi bgdpi arf rmf | 2 | X023556.15-493912.0 | chandra | ccd1 | 992.238 | 166.75 | 163.756 | 13.8468 | 0.0041344 | 0.000349594 | 44.75 | 1 | 5.31315 | 4.37726 | 6.8513 | 10.0528 | F | F | 2.54e+20 | 1.02591e-13 | 1 | dsxf | ||||
| Report | srcpi bgdpi arf | 1 | X023606.15-493350.3 | chandra | ccd1 | 796.185 | 820.598 | 91.5327 | 11.1357 | 0.00231095 | 0.000281146 | 25.0134 | 1 | 2.99013 | 2.32324 | 2.10393 | 11.1206 | F | F | 2.51e+20 | 3.39434e-14 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 3 | X023639.64-494017.6 | chandra | ccd3 | 1163.76 | 255.3 | 75.8299 | 8.77532 | 0.00191465 | 0.00022157 | 36.7884 | 1 | 0.727105 | 0.434842 | 359.256 | 2.97668 | F | F | 2.56e+20 | 2.23081e-14 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 2 | X023814.30-494950.3 | chandra | ccd6 | 368.618 | 575.677 | 73.9931 | 12.2479 | 0.00186842 | 0.000309275 | 4.79122 | 0.999998 | 1.34325 | 1.17017 | 165.274 | 15.1199 | F | F | 2.56e+20 | 2.87966e-14 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 9 | X023642.86-493747.1 | chandra | ccd3 | 1100.38 | 561.235 | 58.2156 | 8.65803 | 0.0014699 | 0.000218609 | 28.2429 | 1 | 0.522342 | 0.522342 | 0 | 4.21245 | F | F | 2.55e+20 | 1.75064e-14 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 10 | X023649.44-493700.0 | chandra | ccd3 | 970.562 | 656.888 | 57.8091 | 8.06002 | 0.00145964 | 0.000203509 | 28.0457 | 1 | 0.743764 | 0.743764 | 0 | 4.49872 | F | F | 2.55e+20 | 1.76756e-14 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 1 | X023710.37-494244.9 | chandra | ccd2 | 330.626 | 970.821 | 61.093 | 8.05105 | 0.0015428 | 0.000203315 | 25.2243 | 1 | 0.517656 | 0.517656 | 0 | 2.60089 | F | F | 2.56e+20 | 1.96197e-14 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 3 | X023748.49-494540.5 | chandra | ccd6 | 874.662 | 1085.04 | 48.2548 | 8.24636 | 0.00121849 | 0.000208231 | 3.12461 | 0.998745 | 3.76022 | 2.73395 | 42.964 | 9.40271 | F | F | 2.56e+20 | 1.62227e-14 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 8 | X023637.01-493642.7 | chandra | ccd1 | 186.035 | 471.941 | 67.7094 | 8.22857 | 0.00170948 | 0.000207749 | 18.5031 | 1 | 1.23904 | 1.23904 | 0 | 5.62321 | F | F | 2.55e+20 | 2.20062e-14 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 4 | X023804.50-494733.5 | chandra | ccd6 | 560.233 | 854.4 | 44.6491 | 8.66053 | 0.00112744 | 0.000218689 | 2.89113 | 0.997738 | 1.68713 | 1.5676 | 155.031 | 12.573 | F | F | 2.56e+20 | 1.68575e-14 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 4 | X023704.37-493915.3 | chandra | ccd3 | 675.687 | 381.934 | 40.317 | 7.00636 | 0.00101797 | 0.000176905 | 19.5595 | 1 | 0.512914 | 0.512914 | 0 | 2.40552 | F | F | 2.55e+20 | 1.34193e-14 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 4 | X023627.83-493705.7 | chandra | ccd1 | 367.387 | 425.052 | 32.7453 | 5.72235 | 0.00082673 | 0.000144474 | 8.94839 | 1 | 1.40465 | 1.40465 | 0 | 6.34795 | F | F | 2.55e+20 | 1.14872e-14 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 3 | X023639.72-493331.3 | chandra | ccd1 | 132.91 | 861.081 | 57.9577 | 8.73163 | 0.00146328 | 0.00022045 | 15.8382 | 1 | 2.80008 | 1.48765 | 341.4 | 8.30965 | A | F | 2.54e+20 | 2.01918e-14 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 5 | X023623.59-493327.2 | chandra | ccd1 | 452.028 | 868.864 | 48.7033 | 9.09877 | 0.00122963 | 0.000229719 | 13.3093 | 1 | 3.19015 | 3.19015 | 0 | 9.55516 | F | F | 2.53e+20 | 1.85123e-14 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 8 | X023634.72-494440.5 | chandra | ccd2 | 1033.17 | 735.867 | 24.3201 | 6.75677 | 0.000614162 | 0.00017063 | 10.0414 | 1 | 1.0792 | 0.42109 | 22.2709 | 4.89322 | F | F | 2.57e+20 | 7.51643e-15 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 6 | X023611.85-493524.0 | chandra | ccd1 | 683.06 | 630.46 | 36.2322 | 7.14156 | 0.000914763 | 0.000180305 | 9.90125 | 1 | 1.7877 | 1.16766 | 18.1434 | 9.4002 | A | F | 2.54e+20 | 1.33033e-14 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 7 | X023709.14-494609.2 | chandra | ccd2 | 355.092 | 555.72 | 40.5052 | 6.36437 | 0.00102289 | 0.000160721 | 16.7239 | 1 | 1.12449 | 1.12449 | 0 | 5.20784 | F | F | 2.57e+20 | 1.43313e-14 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 7 | X023707.01-493819.4 | chandra | ccd3 | 623.531 | 495.654 | 36.5307 | 6.04406 | 0.000922373 | 0.000152608 | 17.7226 | 1 | 0.508386 | 0.508386 | 0 | 3.42804 | F | F | 2.55e+20 | 1.26095e-14 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 4 | X023646.28-494838.1 | chandra | ccd2 | 805.088 | 253.047 | 13.5048 | 5.62493 | 0.00034104 | 0.000142047 | 5.57591 | 0.999996 | 0.814476 | 0.285015 | 82.6582 | 7.51154 | F | F | 2.57e+20 | 4.75921e-15 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 20 | X023722.02-493508.1 | chandra | ccd3 | 326.654 | 884.141 | 29.6194 | 6.24632 | 0.000747868 | 0.000157715 | 14.3697 | 1 | 1.69951 | 1.44479 | 357.547 | 7.41491 | F | F | 2.54e+20 | 1.05843e-14 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 7 | X023642.39-493348.0 | chandra | ccd1 | 79.6665 | 826.722 | 31.4674 | 6.00005 | 0.000794467 | 0.000151485 | 8.59918 | 1 | 1.75788 | 1.41076 | 47.8836 | 7.89174 | F | F | 2.54e+20 | 1.188e-14 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 17 | X023735.49-493557.3 | chandra | ccd3 | 60.665 | 783.702 | 47.7708 | 7.53766 | 0.00120618 | 0.00019032 | 23.1757 | 1 | 3.22659 | 1.49184 | 102.639 | 8.23898 | F | F | 2.54e+20 | 3.42782e-14 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 14 | X023731.60-493822.4 | chandra | ccd3 | 138.146 | 488.815 | 28.0589 | 5.29707 | 0.000708467 | 0.000133747 | 13.6126 | 1 | 1.31168 | 1.31168 | 0 | 6.3509 | F | F | 2.55e+20 | 1.00054e-14 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 2 | X023707.71-494338.8 | chandra | ccd2 | 383.234 | 861.45 | 37.956 | 6.45672 | 0.000958514 | 0.000163053 | 15.6714 | 1 | 0.571139 | 0.571139 | 0 | 2.90296 | F | F | 2.56e+20 | 1.22327e-14 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 11 | X023632.79-493734.8 | chandra | ccd1 | 269.413 | 365.868 | 26.1047 | 5.10928 | 0.000659073 | 0.000128995 | 7.1337 | 1 | 1.78719 | 0.739278 | 337.302 | 5.41137 | F | F | 2.55e+20 | 7.97484e-15 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 2 | X023706.71-494019.1 | chandra | ccd3 | 629.585 | 252.345 | 15.4016 | 4.41183 | 0.000388878 | 0.000111395 | 7.47199 | 1 | 0.312934 | 0.312934 | 0 | 1.88469 | F | F | 2.55e+20 | 4.71533e-15 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 1 | X023616.27-494422.7 | chandra | ccd0 | 373.796 | 557.242 | 12.2362 | 4.52475 | 0.000309003 | 0.000114264 | 6.9362 | 1 | 0.822511 | 0.822511 | 0 | 7.22419 | F | F | 2.57e+20 | 4.03976e-15 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 3 | X023710.16-494326.4 | chandra | ccd2 | 334.884 | 886.559 | 14.1961 | 3.76777 | 0.000358497 | 9.51484e-05 | 5.86133 | 0.999999 | 0.583437 | 0.324722 | 359.497 | 3.00777 | A | F | 2.56e+20 | 4.76508e-15 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 5 | X023644.03-494647.5 | chandra | ccd2 | 849.496 | 477.727 | 18.7251 | 4.32725 | 0.000472871 | 0.000109277 | 7.73128 | 1 | 1.32027 | 1.02378 | 202.239 | 5.83733 | F | F | 2.57e+20 | 6.14867e-15 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 1 | X023720.21-494039.2 | chandra | ccd3 | 363.411 | 211.188 | 15.1323 | 3.89076 | 0.000382079 | 9.82387e-05 | 7.34134 | 1 | 0.896231 | 0.896231 | 0 | 3.8291 | F | F | 2.55e+20 | 5.09196e-15 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 19 | X023708.71-493555.0 | chandra | ccd3 | 589.842 | 788.961 | 14.6436 | 3.8267 | 0.00036974 | 9.66212e-05 | 7.10425 | 1 | 0.94062 | 0.94062 | 0 | 5.752 | F | F | 2.55e+20 | 5.21464e-15 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 5 | X023715.00-493856.6 | chandra | ccd3 | 465.848 | 419.817 | 11.1301 | 3.91735 | 0.000281028 | 9.89105e-05 | 5.3997 | 0.99999 | 0.426844 | 0.426844 | 0 | 3.78269 | F | F | 2.55e+20 | 3.56867e-15 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 22 | X023723.12-493416.3 | chandra | ccd3 | 304.775 | 989.4 | 9.44303 | 4.36632 | 0.000238429 | 0.000110246 | 4.58122 | 0.999858 | 1.03003 | 1.03003 | 0 | 8.23863 | F | F | 2.54e+20 | 3.4715e-15 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 6 | X023720.51-494613.3 | chandra | ccd2 | 131.321 | 547.081 | 12.6322 | 3.55418 | 0.000319006 | 8.97551e-05 | 5.21562 | 0.999987 | 1.61138 | 0.89922 | 239.003 | 6.2018 | F | F | 2.56e+20 | 4.67226e-15 | 1 | dsx | ||||
| Report | srcpi bgdpi arf | 18 | X023646.44-493556.2 | chandra | ccd3 | 1029.41 | 786.045 | 10.0662 | 3.31664 | 0.000254165 | 8.37427e-05 | 4.88358 | 0.999961 | 0.741995 | 0.558051 | 72.4819 | 5.6552 | F | F | 2.54e+20 | 3.15765e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 25 | X023710.40-493345.3 | chandra | ccd3 | 555.667 | 1052.08 | 9.9184 | 3.46414 | 0.000250432 | 8.74669e-05 | 4.81185 | 0.999961 | 0.962401 | 0.664841 | 148.032 | 7.8882 | F | F | 2.54e+20 | 3.73401e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 9 | X023634.00-493924.8 | chandra | ccd1 | 244.7 | 142 | 9.32237 | 3.16229 | 0.000235364 | 7.98392e-05 | 2.54755 | 0.989489 | 0.635476 | 0.492 | 3.33548 | 4.17145 | F | F | 2.56e+20 | 3.02597e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 15 | X023729.98-493759.9 | chandra | ccd3 | 169.591 | 534.227 | 9.11037 | 3.31666 | 0.00023003 | 8.37431e-05 | 4.41984 | 0.999858 | 1.25984 | 0.492 | 71.1496 | 6.30901 | A | F | 2.55e+20 | 3.22642e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 9 | X023658.63-494448.1 | chandra | ccd2 | 561.611 | 720.056 | 8.65877 | 3.00001 | 0.000218662 | 7.57598e-05 | 3.57506 | 0.998873 | 0.515813 | 0.492 | 164.735 | 3.47959 | F | F | 2.56e+20 | 2.98473e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 26 | X023701.73-493808.5 | chandra | ccd3 | 727.333 | 517.333 | 8.34495 | 3.46417 | 0.000210704 | 8.74676e-05 | 4.0485 | 0.999521 | 0.601817 | 0.492 | 21.6817 | 3.2875 | F | F | 2.55e+20 | 2.55579e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 6 | X023646.65-493833.2 | chandra | ccd3 | 1025.12 | 467 | 7.53476 | 2.82844 | 0.000190247 | 7.14159e-05 | 3.65544 | 0.99849 | 0.492 | 0.492 | 45.5115 | 3.23641 | F | F | 2.55e+20 | 2.22946e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 19 | X023707.60-494529.3 | chandra | ccd2 | 385 | 636.25 | 7.48231 | 2.82844 | 0.000188952 | 7.14271e-05 | 3.08932 | 0.997016 | 0.492 | 0.492 | 2.35033e-08 | 4.50117 | F | F | 2.56e+20 | 2.50715e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 11 | X023718.63-494345.3 | chandra | ccd2 | 167.5 | 847.5 | 7.44619 | 2.82844 | 0.00018804 | 7.14271e-05 | 3.07441 | 0.997016 | 0.509344 | 0.492 | 157.5 | 4.2682 | F | F | 2.56e+20 | 2.53689e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 16 | X023720.46-493705.5 | chandra | ccd3 | 357.25 | 645 | 7.43787 | 2.82844 | 0.000187801 | 7.14159e-05 | 3.60844 | 0.99849 | 0.651243 | 0.492 | 39.4982 | 5.706 | F | F | 2.55e+20 | 2.68724e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 11 | X023712.90-494036.0 | chandra | ccd3 | 507.125 | 217.25 | 7.29629 | 2.82844 | 0.000184226 | 7.1416e-05 | 3.53975 | 0.99849 | 0.569193 | 0.492 | 112.263 | 2.69158 | F | F | 2.55e+20 | 2.30155e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 21 | X023717.81-493421.1 | chandra | ccd3 | 409.278 | 979.278 | 7.29049 | 3.00003 | 0.000184079 | 7.57486e-05 | 3.53693 | 0.99849 | 1.40493 | 0.723978 | 169.963 | 7.7612 | A | F | 2.54e+20 | 2.60724e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 12 | X023708.40-493947.9 | chandra | ccd3 | 595.75 | 315.25 | 7.1831 | 2.82844 | 0.000181368 | 7.14161e-05 | 3.48484 | 0.99849 | 0.576561 | 0.492 | 176.437 | 2.41455 | F | F | 2.55e+20 | 2.21302e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 23 | X023712.46-493737.0 | chandra | ccd3 | 515.5 | 581.125 | 7.14656 | 2.82844 | 0.000180445 | 7.14161e-05 | 3.46711 | 0.99849 | 0.983381 | 0.492 | 155.105 | 4.49042 | A | F | 2.55e+20 | 2.29614e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 8 | X023707.75-493814.0 | chandra | ccd3 | 608.5 | 506 | 7.1199 | 2.82844 | 0.000179772 | 7.14161e-05 | 3.45417 | 0.99849 | 0.492 | 0.492 | 103.283 | 3.56388 | F | F | 2.55e+20 | 2.34694e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 13 | X023725.28-493930.4 | chandra | ccd3 | 262.5 | 350.375 | 6.97528 | 2.82845 | 0.000176121 | 7.14162e-05 | 3.38401 | 0.99849 | 0.879489 | 0.631475 | 133.861 | 4.94461 | F | F | 2.55e+20 | 2.37174e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 10 | X023707.65-494452.2 | chandra | ccd2 | 383.928 | 711.643 | 6.63657 | 2.64576 | 0.000167595 | 6.68139e-05 | 2.74013 | 0.992583 | 0.504314 | 0.492 | 98.677 | 3.94149 | F | F | 2.56e+20 | 2.20254e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 24 | X023727.45-493501.7 | chandra | ccd3 | 218.786 | 896.5 | 5.70489 | 2.64578 | 0.000144044 | 6.6804e-05 | 2.76769 | 0.988031 | 1.57392 | 0.624906 | 108.984 | 8.01618 | A | F | 2.54e+20 | 2.14643e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 13 | X023643.34-494652.0 | chandra | ccd2 | 862.667 | 468.167 | 5.49667 | 2.4495 | 0.000138809 | 6.18578e-05 | 2.26948 | 0.982761 | 0.493661 | 0.492 | 67.1374 | 5.95001 | F | F | 2.57e+20 | 1.81177e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 3 | X023543.70-494153.4 | chandra | ccd0 | 1016.17 | 858.276 | 41.819 | 8.71815 | 0.00105606 | 0.000220161 | 23.7055 | 1 | 6.44088 | 3.85587 | 130.85 | 11.8482 | A | F | 2.55e+20 | 1.61483e-14 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 5 | X023613.99-494655.1 | chandra | ccd0 | 417.409 | 246.955 | 6.72477 | 3.3167 | 0.000169822 | 8.37574e-05 | 3.812 | 0.998559 | 1.9648 | 1.40627 | 69.2202 | 8.90073 | F | F | 2.58e+20 | 2.50467e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 6 | X023611.55-494605.3 | chandra | ccd0 | 465.662 | 348.041 | 25.6975 | 6.08288 | 0.000648943 | 0.000153612 | 14.5668 | 1 | 3.22337 | 2.8806 | 138.426 | 8.73352 | F | F | 2.57e+20 | 9.02076e-15 | 1 | dx | ||||
| Report | srcpi bgdpi arf | 7 | X023623.55-494145.7 | chandra | ccd0 | 230.826 | 876.685 | 52.5007 | 7.24574 | 0.00132581 | 0.000182979 | 29.7605 | 1 | 1.44796 | 1.44796 | 0 | 5.40484 | F | F | 2.56e+20 | 1.62647e-14 | 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