Polarimetry of exotic transients
This program aims to characterise exotic and unusual transient phenomena by
the aims of polarimetry. Polarimetry is a powerful diagnostic tool to study
spatially unresolved sources and the polarisation degree is related to the
geometry of the transient's
photosphere. By constructing polarimetric light
curves of unusual transients, such as superluminous supernovae, tidal
disruption events or fast transients, we will place important constraints on
the explosion physics and emission mechanisms of these elusive events.
Type of observations:
The observing mode is imaging polarimetry with ALFOSC in one or multiple
In almost all cases we will request linear polarimetry requiring the
lambda/2 retarder plate in the FAPOL unit that is always mounted in ALFOSC.
In rare cases, we might request circular polarimetry, provided that lambda/4
is mounted (after agreement with the telescope staff).
We expect to obtain between 5-8 epochs/data points for 2 different transient
in 1-4 filters (predominantly V-band but also BRI if possible).
We request standard bias and flats obtained with the same setup (e.g.
window, binning, filter) as the science frames.
As this is a ToO we do not have strict constraints on the observing
conditions and the observations can be executed in any lunar phase. In case
we have specific constraints (e.g. seeing limit) for a particular
observation this will be specified in the trigger email and the OB
The OB group to be observed on any night will appear in the Queue as a
- In a sequencer window type cd ~/scripts/59-013/
- In this directory you will find the OB compiled script for each night,
Run the script within the requested UT window.
if the script is not available, please compile it from the OB Queue.
In the OB Queue the OB groups to be observed on the current date will
be high-lighted with an orange colour.
- Execute the OB. The OB will point the telescope, obtain an acquisition
image and the requested science frames. Please check you can recognise the
field by comparing it with the Finding Chart. It will be appreciated if you
check that the target (marked in the finding Chart) is not saturated in the
observations. If so, please repeat by reducing the exposure time
The PI will send the target and observing information
when this ToO is triggered.
||P60: 20191001 - 20200401
||Polarimetry of exotic transients
||1 hard trigger, max 45min, possibly 5 obs in 4 hr (soft)
||Soft ToO during Nordic service or Technical nights
|Total Time Spent
||ALDa170033 - ALDa170037
||Observed by Hans Deeg.
The above information is collected from the ToO/Mon reports that have been created by the observer.
Should any of the observations have been carried out using the OB system, you will find additional information