Pete Challis Astronomical Color CCD Astronomy Pictures GRB and Supernova Movie s

Hi Joey, I think I sent you enough targets for half a night... and there's two halves... hmmm.. But, weather can be iffy in June. Lets' start with this list, then if its clear and you were able to get everything, then I'll send you a new list on Sunday. There are plenty of targets !! I'll have all the targets on my web page, and a copy of this email. http://cfa-www.harvard.edu/~pchallis/magellan.html I will send you additional second half target, Just in case you might not have targets. If you are able to make some observations, great, they will make useful measurements, If not, thats fine, too. Thanks for doing our observing for us !!! If you have any questions please let me know, cheers, -Pete Jun 9th For the night of: Sat, 2007 Jun 9 ---> Sun, 2007 Jun 10 Sunset ( 2215 m horizon): 17 58 CST; Sunrise: 7 28 CST Evening twilight: 19 15 CST; LMST at evening twilight: 11 44 Morning twilight: 6 10 CST; LMST at morning twilight: 22 40 night center: 0 43 CST The sun is down for 13.5 hr; 10.9 hr from eve->morn 18 deg twilight. wow !! long nights !! Targets: I don't think we have time of get a good spectrum of sn2006jd, because the target sets too early, even trying to get spectra on each night doesn't quite work. But, a couple images would make a useful light curve measurement. target pos brightness Requested Science Exposures sn2005la 12:52:15.68 +27:31:52.5 1x1200sec offset is 6"S and 6"W sn2004gk 12:25:33.23 +12:15:40.1 2x1200sec offset is 2.7"N and 1.5"W sn2006ck 13:09:40.42 -01:02:57.2 2x1200sec offset is 3.0"S and 10.2"W sn2006jd 08:02:07.43 +00:48:31.5 22nd mag r' i' imaging 120 seconds each. sn2007aw 09:57:24.16 -19:21:23.1 ~21 mag 3x20 min + acquisition images sn2007S 10:00:31.26 +04:24:26.2 ~20 mag 3x20 min + acquisition images sn2007I 11:59:13.15 -01:36:18.9 ~21 mag ~4x20 min + acquisition images sn2007C 13:08:49.30 -06:47:01.0 ~19 mag ~3x20 min + acquisition images SNF20070517-014 22:42:48.98 24:02:47.2 18.2 mag 2x15 minutes + 10 minutes center on host (this is second half object... If it doesn't work out with your targets list, no problem. Don't worry about it.) Priority: 1) sn2005la 2) sn2004gk 3) sn2006ck 4) sn2007I 5) sn2007C 6) sn2007aw (I still need to make a finder for this target.) 7) sn2007S (I still need to make a finder for this target.) 8) SNF20070517-014 (if possible) This is a new target... we don't have access to the finders, etc, so we don't know the angle between the host galaxy and the supernova. It would be nice to get both spectra at the same time. very hard to figure out with LDSS3 on the fly. If there is time, then get 2x15 minutes on the supernova, and 1x10 minutes on the host galaxy, just do another lcobject and acquiring on the host galaxy instead of the Supernova. I'll make a finder. If little time, then just spectrum of SN. Standard stars: Yes, please try to observe all 4. name position LDSS3 exposure time LTT 3218 08:41:33.6 -32:56:55 20 seconds LTT 3864 10:32:13.8 -35:37:42 30 seconds LTT 4364 11:43:36.6 -64:50:24 15 seconds LTT 4816 12:38:50.7 -49:47:58 45 seconds USE the humay star catalog.. because it has the correct proper motion ! Parallactic angle !!!!! remember to ask the operator to make sure the rotator is set to the Parallactic angle. (I didn't do this once and its really makes a huge difference in the flux calibration !!! The catalog 001 sn2006jd 08:02:07.43 +00:48:31.5 2000.0 0.00 0.00 -62.6 HRZ 002 sn2007I 11:59:13.15 -01:36:18.9 2000.0 0.00 0.00 -62.6 HRZ 003 sn2007C 13:08:49.30 -06:47:01.0 2000.0 0.00 0.00 -62.6 HRZ 004 sn2007aw 09:57:24.16 -19:21:23.1 2000.0 0.00 0.00 -62.6 HRZ 005 sn2007S 10:00:31.26 +04:24:26.2 2000.0 0.00 0.00 -62.6 HRZ 006 SNF20070517-014 22:42:48.98 +24:02:47.2 2000.0 0.00 0.00 -62.6 HRZ 007 sn2005la 12:52:15.68 +27:31:52.5 2000.0 0.00 0.00 -62.6 HRZ 008 sn2004gk 12:25:33.23 +12:15:40.1 2000.0 0.00 0.00 -62.6 HRZ 009 sn2006ck 13:09:40.42 -01:02:57.2 2000.0 0.00 0.00 -62.6 HRZ finders for sn2006jd sn2007I and sn2007C (i'll put all other finders here, too.) cfa-www.harvard.edu/~pchallis/magellan.html These images were taken at Magellan 2 months ago. You probably will need to change the LUT values in lcobject to match these images. more finders are here: http://cfa-www.harvard.edu/oir/Research/supernova/SNfollowup.html Slit: 1.25" BLUE TILT (or 1.0" is fine) Subraster: 1 2064 1500 2800 (This is close to getting the entire 4 sections of the long slit) no need to ever change this. You should see the yellow boxes on the quick tool match slits. This subraster includes everything in the X direction (wavelength) and part of the Y direction (spatial). binning: 1x1 readout: slow for everything Flats: Lamp Quartz high 5 seconds. we don't take flats in the afternoon. Because of the fringing we use the flats taken about the same time as the observations. after each science exposure. take 3 flats (NO HENEAR). its pretty quick. A total of ~6-9 is a good number per target. Henear: the LDSS3 wavelengths don't change over the course of the night, so just take one or two at the beginning of the night and maybe one at the last target exposure time: 2 seconds. To be done in the afternoon: measure params for ltoslit and lcobject make an image of the slit in GUI: 1 second exposure. 1.25" BLUE SLIT. no grating. no filter. (I think the scattered light in the dome is enough...) the IRAF task "lstitch" combined the 2 CCD images into 1 fits image. Remember we are using the 1.25" slit with the BLUE slit. ( or 1.00" slit is fine. ) Because of the design of the spectrograph the BLUE slit will increase the throughput of the blue wavelengths. you can use iraf imexam "j" I think to get the centering of the slit. jimexam Parameters for line 1D gaussian fit plots kimexam Parameters for column 1D gaussian fit plots on April 15th the Parameters for lcobject and ltoslit were the position of the slit is X= 2676.06 Y= 2100.00 these were measured on the lstitch image (The manual say not to do this.. we think the manual is wrong ??) -------------------------------------------------------------------------------- just after sunset: r' and i' dome flats try to get at least 7 exposures ~5-10 seconds. ( I think you have to use the low voltage quartz lamp, minimum exposure for a usable flat is 5 seconds to avoid any shutter issues.) Acquisition for standard stars: goto catalog object (Humay catalog) after slew, operator will ask you to run ltoslit run ltoslit GUI: grating - Clear, or none, filter - r', aperture - Clear, or none take acquisition image: r' 1 second readout slow. best to keep readout set to "slow" for the entire night. run lcobject The IRAF task lcobject will ask you a couple questions. What's the size of the image you want displayed... ? I pick ~600 or 1000 pixels. "Do you want to SKIP the measurement of the slit ?" answer: YES (because you already did this in the afternoon, and lcobject has the correct parameters) "Did you just acquire the object ?" answer: NO, because you are using ltoslit. Then the task lcobject will show you an image in ds9 centered on your x,y lcobject parameters. i.e. the Supernova should be near the center of the ds9 image. Adjust gray levels as needed. select SN with cursor or centroid (m). Double check the pick circle is centered around the SN. If the slew if > 10" then you'll need another acquisition image and repeat lcobject. This doesn't really hurt, its just an extra minute and it is important that the target is really in the slit !!!! If the slew is < 10", then (The telescope usually does a good job of correctly slewing and putting the object into the slit when the slew is less than 10 arcseconds. Also, we're using a wide slit 1.25"... if we were using 0.75" then we would be more picky about the size of the final slew into the slit.) Then set in the GUI: put in grating - VPH_ALL, filter - CLEAR, aperture - 1.25 BLUE (called LS12.2s) take science exposure (exposure from above) take 5 flats. summary of observing sequence: slew ltoslit wait for guiding take acquisition image r' 1 second lcobject If slew < 10", then proceed to science exposure, otherwise take another acq image science exposure 5 x 5 second flats bright quartz lamp. Acquisition For Supernovae for just imaging: sn2006jd go to catalog object ask operator to set guiding and SH. take r' and i' images Acquisition For galaxy spectra: go to catalog object after slew, operator will ask you to run ltoslit run ltoslit Take 45 second r' acquisition image. centroid on host galaxy (based on the finders or DSS image) then offset OFFSET are here: sn2005la 12:52:15.68 +27:31:52.5 1x1200sec offset is 6"S and 6"W sn2004gk 12:25:33.23 +12:15:40.1 2x1200sec offset is 2.7"N and 1.5"W sn2006ck 13:09:40.42 -01:02:57.2 2x1200sec offset is 3.0"S and 10.2"W For the galaxies with just 1 20 minutes exposure just take 6 flats afterward. Acquisition For Supernovae for spectra: go to catalog object. after slew, operator will ask you to run ltoslit run ltoslit the operator now sets up the guiding and SH. Take images: in GUI grating = none, filter - i', aperture - Clear observe both r' and i' for 10 seconds each and then 45 seconds each. readout slow, same subraster for everything. Observing sequence: i' 15 seconds i' 60 seconds r' 15 seconds r' 60 seconds (most likely to have best SN signal, so we do it last) lstitch the last r' image. run lcobject if the slew is < 10" then set the GUI to: grating VPH_ALL , filter - None or Clear , aperture LS10.2s summary of observing sequence: slew to target ltoslit wait for guiding i' 15 seconds i' 60 seconds r' 15 seconds r' 60 seconds lcobject (another r' if needed) 20 minute science exposure I don't like to go more than 1200 seconds, because of seeing changes. 3 flats 5 second each 20 minute science exposure 3 flats 5 second each 20 minute science exposure 3 flats 5 second each no need for additional henear... just once during the evening. 3 flats 5 second each Acquisition for Galaxies. slew to catalog object Catalog should be 00X galaxy 13:08:49.30 -06:47:01.0 2000.0 0.00 0.00 117.4+PA So, if the directions are for angle 54 degrees, then the catalog will be 00X galaxy 13:08:49.30 -06:47:01.0 2000.0 0.00 0.00 171.4 run ltoslit take r' for 30 seconds (exposure depends on brightness of galaxy). lstitch the image centroid on the galaxy center. if slew > 10", repeat acquisition. if slew < 10", then proceed with science exposures. xx minute science exposure 3 flats 5 second each xx minute science exposure 3 flats 5 second each xx minute science exposure 3 flats 5 second each