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.
Go to the directory
List the available scripts
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):
The standard star visibility plot of today:
- No blocking filter should be used in any of the spectroscopic observations.
- The ALFOSC specific Cookbook can be accessed
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:
- 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