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P59-506: An all-sky view of transients in the local Universe

PI: E. Kankare, M. Stritzinger, P. Lundqvist

The yearly supernova (SN) candidate discovery rate is increasing exponentially thanks to the revolution in time domain astronomy by large-scale all-sky transient surveys. The full scans of the entire night sky ensure the discovery of young, bright transients within an increasingly large volume of the local Universe in an unbiased way. P59-506 is a long-term observational classification and follow-up programme to study SNe, SN impostors, and tidal disruption events, discovered within hours to days after explosion e.g. by the All-Sky Automated Survey for Supernovae (ASAS-SN), and the Gravitational-wave Optical Transient Observer (GOTO). The aim is for near real-time spectroscopic classification and subsequent follow up of young events. NOT observations will play a fundamental role in addressing a whole host of science work packages, e.g.: (i) SN Ia progenitors and their explosion physics, (ii) the progenitors and rates of core-collapse SNe, (iii) nuclear transients, and (iv) SNe interacting with a circumstellar medium and superluminous SNe. The project will be coordinated with the programme P59-007 via NOT-TNG time exchange (PI: A. Pastorello, Padova).



ToO + Soft ToO triggers

Observations will be requested with ALFOSC.

The OB generator will be used to request all ToO observations. Scripts to perform all the requested operations will be automatically created and placed in the directory ~/scripts/59-506/. An email will be sent automatically to the observer, which contains all the information about the requested observations, the names and locations of the scripts, instructions for observing and comments from the creator of the trigger.

To summarise:

Go to the directory
  cd ~/scripts/59-506
List the available scripts
  ls -lrt

and execute the OB generated scripts requested in the trigger email.

The information below is only given as additional support.


Fixed half-nights service observations

The OB generator will be used to request all observations. For each half night, the PI will send a 'trigger' through the OB-generator. Note that the trigger needs to be Compiled and/or Queued by the staff observer, or the staff person preparing the observations, using the OB-generator.

In order to queue the observations, enter the OB generator and click on the Queue it! button.
Then compile the scripts manually, either through the compile buttons in the OB generator or from within the OB queue.

Scripts are placed in the directory ~/scripts/59-506/ as above for ToO/Soft ToO.

When an OB is queued, an e-mail will be sent automatically to the observer, which contains all the information about the requested observations, the names and locations of the scripts, instructions for observing and comments from the creator of the trigger.


General information on the ALFOSC spectroscopy and photometry:

  • Possible required setup:
    • Filters: ugriz, (UBVRI)
    • Grisms: #4, #7, #8, #18, #19, #20
    • Slits: 0.75", 1.0", 1.3"

  • If the seeing is better than ~1.2", the 1.0" slit should be used, otherwise the 1.3" one.

  • Take 3 imaging flat fields in the required broadband filters using twilight sky, either in the evening or in the morning, using the alfosc.easyflat script.

  • The exposure time of the spectrum depends on the magnitude of the target:
    • If V < 17 mag the on-source exposure time is 1 x 900 sec
    • If V = 17-18 mag the on-source exposure time is 1 x 1800 sec
    • If V = 18-19 mag the on-source exposure time is 1 x 2400 sec
    • If V > 19 mag the on-source exposure time is 1 x 3600 sec

  • Standards will usually be selected by the triggering individual and OB scripts for observing these will also be present in ~/scripts/59-507. Typically one of the following spectroscopic standards is used (sorted in the order of preference):

  • ING ID Name RA (J2000.0) DEC (J2000.0) Exp. time FC
    SP1036+433 Feige 34 10:39:36.7 +43:06:10.1 100 sec Feige34.gif
    SP1234+254 Feige 66 12:37:23.6 +25:04:00.3 50 sec Feige66.gif
    SP0501+527 G191B2B 05:05:30.6 +52:49:56.0 120 sec G191B2B.gif
    SP1550+330 BD+33 2642 15:51:59.9 +32:56:53.0 60 sec BD+33.2642.gif
    SP2148+286 BD+28 4211 21:51:11.1 +28:51:52.0 60 sec BD+28.4211.gif


    The standard star visibility plot of today:

    Please wait ... Genrating visibility plot


  • No blocking filter should be used in any of the spectroscopic observations.

  • The ALFOSC specific Cookbook can be accessed here.


General information on the NOTCam photometry:

NOTCam will be used only in the Service part of this proposal. The service time is on fixed nights and the tracking log will not include these observations.

The OB generator will be used to prepare all observations, and the information below is only for orientation.

  • Possible required setup:
    • Filters: JHKs
    • Camera: WF

  • Take 2 sets (bright and faint with the same exposure time) of 8 imaging flat fields in the required broadband filters using twilight sky, either in the evening or in the morning, using the notcam.skyflat script.

  • Please, make sure that the target counts (including sky background) remain linear, i.e. <25000 counts – check & adjust exposure times if necessary. This is particularly important in the Ks-band.

  • Generally the targets are expected to be distant enough that off-source dithering for background subtraction will not be required and that the on-source exposures can be used also as sky frames. By default, the observing scripts are based on the 9point script which carries out a 9 point dither (3x3 grid) observation. However, if separate sky frames are required a beamswitch script will be used.

  • The NOTCam specific Cookbook can be accessed here.



No tracking data available