Observing Report ++++++++++++++++ INT WFC imaging: July 14-19 2001 Observers: Mike Watson (14-17), Jonathan Tedds (16-19) (Leicester) Instrument: standard WFC imaging at INT prime focus Filters: U g r i Z Ha Nominal exposures: 1200s 600s 600s 1200s 1200s 1200s Pointing position: ------------------ 2.5 arcmin RA, 2 arcmin dec offsets from XMM field position as advised Observing conditions: --------------------- 14 July: clear but dusty, good mostly good seeing 15 July: clear, dust gone, seeing poor slowly improving 16 July: clear, sub-arcsec seeing for first hour then 2-4 arcsec for remainder - atrocious 17 July: much cirrus at twilight, cleared within 2 hours, seeing 1.1-1.7 arcsec., typically 1.3-1.5 long periods of stable seeing 18 July: clear but dusty, seeing 1.2-2 but only at lower end for lowest airmass targets 19 July: clear, dust mostly gone but gusty wind caused problems and seeing 1.5-2 arcsec until 2nd half of night 1.3-1.6 arcsec. Moon: last Q --> dark Time lost to technical problems: -------------------------------- Several AG glitches caused trailed images, wasting time. We had a few episodes of 'DMA transfer failure' on AG. Problems in zerosetting on 4th night lost almost an hour. Telescope focus out of limits on arrival night5 requiring assistance. Continuing AG problems as above but minor impact. Unexplained oscillations caused trailing of some fields in middle of last night - fault report lodged after consultation (14292). Overall little time lost Targets observed ---------------- Target RA DEC Filters Comments U g r i Z Ha MS1229.2643 12 31 32.3 +64 14 21.0 18 17X 14 18 * - HD117555 13 30 47.4 +24 13 59.0 18 16 14 16 16 - RXJ1334.350 13 34 20.2 +50 30 54.0 * * 14 * * - QSO1345584 13 47 41.4 +58 12 42.0 * * 14 * * - A1795 13 48 53.5 +26 35 32.0 * * 14 * * - WJ1350.8600 13 50 50.5 +60 07 32.0 * * 14 * * - A1835 14 01 02.2 +02 52 41.0 * * * * * - A1837 14 01 35.3 -11 07 37.2 19X 16 14 15 15 - PG1404226 14 06 22.2 +22 23 46.7 * * 14 * * - 44Boo 15 03 47.4 +47 39 14.6 * * 16 * * - bt star NGC5846 15 06 29.2 +01 36 20.7 * - - - * - A2052 15 16 44.4 +07 01 18.0 * 19 15 * 19 - MKW3s 15 21 50.5 +07 41 27.0 * * 15 * * - UZLIB 15 32 23.2 -08 32 05.0 * - - - * - A2163of3 16 14 34.3 -06 09 00.0 * * * * * - A2163of2 16 15 46.4 -05 51 00.0 * * * * * - A2163of4 16 15 46.4 -06 27 00.0 * * * * * - A2163of1 16 16 48.4 -06 09 00.0 * * * * * - NGC6240 16 52 59.5 +02 24 04.0 17X - 14 *r 16X17 - PDS456 17 28 20.2 -14 15 56.0 * - 14 - 14 * WR110 18 07 57.5 -19 23 56.9 18X 15 14 15,3 18X - RIDGE_1 18 25 56.5 -12 13 33.0 19X - - - 19X - trailing RIDGE_2 18 26 44.4 -11 51 26.0 - - - - - - RIDGE_3 18 27 32.3 -11 29 19.0 19 - - - 19 - RIDGE_4 18 28 19.1 -11 07 11.0 - - - 15 19 15 RIDGE_5 18 29 06.6 -10 45 03.0 - - - 19 19 * G21off3 18 33 26.3 -10 24 02.0 18 15X17 15 15 16X17 16X17X17 NGC7009 21 04 11.1 -11 21 50.0 18 16X17 14 16X17 17 - NGC7010 21 04 40.4 -12 20 18.0 * * 14 * * - PKS2126158 21 29 12.1 -15 38 41.0 18X - 14 - 18 - PKS2135147 21 37 45.4 -14 32 55.4 18X 16X17 14 16X17 16X17 - ms213723 21 40 15.1 -23 39 41.0 * * 14 15 * - A2390 21 53 37.3 +17 41 45.0 18 - - - - - PB5062 22 05 10.1 -01 55 18.0 * 19 14 19 *r - LBQS2212175 22 15 32.3 -17 44 05.7 * - 14 *r - - Mark304 22 17 12.0 +14 14 21.1 18 new field PHL5200 22 28 30.3 -05 18 55.0 * - - - - - IRAS2249118 22 51 49.4 -17 52 23.2 19X 17 14 15 17 - Abell2597 23 25 21.2 -12 07 12.0 * - - - * - Abell2670 23 54 09.9 -10 24 00.0 * *r - - - - ZAnd 23 33 39.9 +48 49 05.9 17 15 14 15 17 15 Abell2690 00 00 30.3 -25 07 30.0 * * 14 19 * - G13369Pos_1 01 04 24.2 -06 24 00.0 * 19 14X19 17 * - NGC507 01 24 00.0 +33 12 05.0 18 16X18 14 16X18 18 - MS0205.7350 02 08 38.3 +35 23 12.0 * * 14X * * - SDS2 02 19 36.3 -05 00 00.0 * 19 14X19 15 * - GRB010220 02 36 59.5 +61 45 57.6 * * 14X18 * * - MBM12 02 56 05.5 +19 28 35.0 * * * * * - MBM12Pos_2 02 56 05.5 +19 23 00.0 * 15X 15X * * - RXJ0256.500 02 56 33.3 +00 06 12.0 * * * * * - --KEY: 5,16,17,18,19 = data taken on 14,15,16,17,18,19 July 2001 * = data required *r = data repeat required before run ##X = seeing >1.7 arcsec - may need repeating Biases/Flat fields/Landolt standards: ------------------------------ A set of 5 biases were taken before the start of observing each day. Flat fields were taken on best efforts basis at the beginning and sometimes at the end of each night. Landolt standards were taken at the beginning and end of most nights (and the middle of two). Exposure times were not checked w.r.t. saturation as this is rather time consuming given the poor quality of the finding charts available. Use of time and issues ---------------------- The main aims of this run were: - to provide deep imaging for potential fields for upcoming AXIS spectroscopic runs. To this end as many fields as possible were done in r on the first night which fortunately had reasonable conditions - to do complete UgriZ sets for all new fields (+ Ha for low lat) - to complete missing colours in fields already started and/or to redo images that were of poor quality in previous runs The main fields considered/attempted all have XMM observations made except Mark304 (see below). In practice the amount of good imaging time we had available meant that we did not finish all that we set out to do. MGW prepared a list of new fields which have not yet been observed with XMM and Mark304 opened up as low airmass when no other targets suitable (night 5) given conditions. The business of redoing imaging is also not easy to sort out at present due to the lack of quality control information. We took some of the observing reports literally and redid a modest number of images where the quality was reported as being low. Due to field selection issues (see below), much of the imaging was done at high airmass. Unfortunately this only works well if you have ideal conditions, which was not the case for much of our run. Field selection --------------- July is a difficult time for the XID imaging programme as the northern Galactic plane dominates the middle of the night and unfortunately this is precisely the region which contains the XMM visibility hole. The net result is that most fields lie at the beginning of the night or at the end. In fact to get a reasonable number of fields with XMM data meant going to quite low Declination (-25) and including a few fields whose suitablility for XID had not been fully checked. The number of cluster fields is high in this run and we may have to live with the fact that some of them are not as suitable for XID as we would like. One field (44 Boo) turned out to contain a very bright star (44 Boo itself of course) which ought to have been caught at the planning stage (mea culpa). One other field (NGC 7010) has a net XMM exposure well below 20 ksec (although the allocated exposure is around 20 ksec), so this was dropped during the run.