Table 1: CCD frames of the gravitational lens system Q2237+0305 taken with the 2.6 m NOT telescope in 1999/2000 for the GLITP collaboration (Bgnd stands for mean sky background level).
V Band R band
Date UT hel. JD Seeing Bgnd Date UT hel. JD Seeing Bgnd
  -2 450 000 ('') (ADU)   -2 450 000 ('') (ADU)
Oct. 1, 20:10a 1453.34529 1.0 500 Oct. 1, 20:17a 1453.35044 1.0 790
Oct. 2, 20:17a 1454.35062 1.2 405 Oct. 2, 20:24a 1454.35534 1.3 750
Oct. 3, 20:19 1455.35194 1.3 200 Oct. 3, 20:13b 1455.34775 1.2 405
Oct. 4, 20:02a 1456.33988 0.9 515 Oct. 4, 19:55a 1456.33518 0.9 1035
Oct. 5, 20:13a 1457.34818 1.0 415 Oct. 5, 20:20a 1457.35305 1.0 765
Oct. 6, 19:36a 1458.32211 1.1 4640 Oct. 6, 19:45a 1458.32870 1.0 2260
Oct. 7, 19:37a 1459.32277 1.1 3170 Oct. 7, 19:44a 1459.32760 1.3 2235
Oct. 9, 23:01a 1461.46482 1.0 370 Oct. 9, 22:53a 1461.45959 0.9 570
Oct. 11, 19:51 1463.33313 1.1 275 Oct. 11, 19:45b 1463.32893 1.1 655
Oct. 12, 19:39 1464.32514 1.2 485 Oct. 12, 19:45b 1464.32923 1.1 540
Oct. 13, 20:13 1465.34886 0.9 225 Oct. 13, 20:19b 1465.35296 0.7 390
Oct. 14, 19:56 1466.33724 1.0 260 Oct. 14, 20:07b 1466.34434 0.8 485
Oct. 15, 19:51 1467.33372 1.3 350 Oct. 15, 19:57b 1467.33793 1.0 595
Oct. 16, 21:55 1468.41987 1.2 320 Oct. 16, 22:03b 1468.42504 1.0 495
Oct. 17, 20:05 1469.34313 0.9 560 Oct. 17, 20:11b 1469.34717 0.8 775
Oct. 18, 19:55 1470.33610 0.8 690 Oct. 18, 20:00b 1470.34016 0.8 990
Oct. 19, 19:52c 1471.33449 1.1 1140 Oct. 19, 19:58b,c 1471.33849 1.0 1445
Oct. 21, 20:42c 1473.36917 0.7 2815 Oct. 21, 20:48b,c 1473.37320 0.6 3900
Oct. 23, 20:57c 1475.37940 0.7 2290 Oct. 23, 21:03b,c 1475.38363 0.6 2345
Oct. 29, 19:58 1481.33883 1.0 180 Oct. 29, 20:04b 1481.34294 0.9 390
Oct. 30, 20:02 1482.34209 1.3 295 Oct. 30, 19:55b 1482.33684 1.3 720
Nov. 1, 19:48 1484.33223 1.0 240 Nov. 1, 19:55b 1484.33686 0.9 455
Nov. 2, 19:48 1485.33192 1.0 190 Nov. 2, 19:42b 1485.32786 1.0 450
Nov. 3, 19:49 1486.33289 0.7 215 Nov. 3, 19:55b 1486.33695 0.6 510
Nov. 6, 20:06 1489.34486 1.4 200        
Nov. 7, 19:42 1490.32789 1.2 230 Nov. 7, 19:56b 1490.33807 1.0 545
Nov. 8, 20:05a 1491.34444 0.8 495 Nov. 8, 20:12a 1491.34896 0.7 930
Nov. 9, 20:06 1492.34495 0.7 225 Nov. 9, 20:00b 1492.34084 0.6 595
Nov. 10, 19:41 1493.32782 1.1 210 Nov. 10, 19:47b 1493.33189 1.0 495
Nov. 11, 20:00 1494.34051 0.6 200 Nov. 11, 19:54b 1494.33642 0.6 500
Nov. 12, 20:44 1495.37103 0.6 240 Nov. 12, 20:51b 1495.37570 0.6 475
Nov. 26, 21:11c 1509.39009 1.1 195 Nov. 26, 21:17b,c 1509.39435 0.9 810
Nov. 27, 22:41c 1510.45219 0.8 245 Nov. 27, 22:35b,c 1510.44811 0.7 515
Nov. 28, 20:02d 1511.34186 1.0 255        
Dec. 9, 19:16 1522.31018 1.2 315 Dec. 9, 19:23b 1522.31471 1.1 500
Dec. 10, 19:04 1523.30205 0.7 910 Dec. 10, 19:11b 1523.30628 0.6 890
Dec. 11, 19:19 1524.31234 1.2 305 Dec. 11, 19:26b 1524.31663 1.1 615
Dec. 12, 19:29 1525.31923 1.1 325 Dec. 12, 19:35b 1525.32341 1.1 665
Dec. 13, 19:52e 1526.32778 0.9 410 Dec. 13, 19:58b 1526.33932 0.9 745
Dec. 14, 19:35 1527.32302 0.9 665 Dec. 14, 19:41b 1527.32723 0.9 1135
Dec. 15, 19:34 1528.32256 0.9 815 Dec. 15, 19:42b 1528.32770 0.8 1280
Dec. 16, 19:45e 1529.32292 1.8 920 Dec. 16, 19:58e 1529.33194 1.9 1365
Dec. 19, 20:14 1532.34970 1.1 1350 Dec. 19, 20:20b 1532.35388 1.1 1585
Dec. 20, 19:51 1533.33411 1.1 1520 Dec. 20, 19:57b 1533.33827 1.1 1740
Dec. 21, 19:42 1534.32799 1.3 1995 Dec. 21, 19:49b 1534.33233 1.1 2175
Dec. 22, 20:12e 1535.34167 1.8 2960 Dec. 22, 20:18e 1535.34583 1.8 3020
Dec. 23, 20:18 1536.35238 1.1 1690 Dec. 23, 20:12b 1536.34835 1.2 1730
Dec. 25, 19:44 1538.32867 1.2 280 Dec. 25, 19:38b 1538.32449 1.2 670
Dec. 27, 19:34 1540.32195 1.3 275 Dec. 27, 19:40b 1540.32616 1.3 650
Dec. 28, 19:45 1541.32909 1.2 245 Dec. 28, 19:50b 1541.33314 0.9 575
Dec. 29, 20:13 1542.34854 0.9 230 Dec. 29, 20:07b 1542.34437 1.0 555
Jan. 2, 19:52 1546.33375 1.2 260 Jan. 2, 19:58b 1546.33777 1.3 600
Jan. 3, 20:24 1547.35611 0.8 310 Jan. 3, 20:18b 1547.35211 0.8 765
Jan. 4, 20:10 1548.34637 0.8 260 Jan. 4, 20:04b 1548.34205 0.8 610
Jan. 11, 20:03 1555.34108 1.7 525 Jan. 11, 20:09e 1555.33958 1.9 980
Jan. 25, 20:10 1569.34438 1.4 415 Jan. 25, 20:03b 1569.33967 1.4 985
        Feb.  3, 20:18e 1578.34583 2.0 1370
a Image obtained with ALFOSC, flipped, rebinned to a scale of 0.176''/pixel and truncated to $1024\times1024$ pixels.
b Frame flipped east-to-west without rebinning.
c Frame rebinned to correct for an approximate field rotation of $-45\hbox{$^\circ$ }$.
d Frame rebinned to correct for an approximate field rotation of $+20\hbox{$^\circ$ }$.
e Frame of too bad quality to enter the analysis process (strongly elongated images).

Source LaTeX | All tables | In the text

Article Contents
1 Introduction
2 Observations
3 Differential photometry by optimal image subtraction
4 Magnitude zero-points: Towards absolute photometry
5 Realistic error bars from simulation of CCD frames
6 Photometric results
7 Discussion
References
List of tables
List of figures