For unanticipated observations of exceptional and urgent scientific value, ING allocates a number of hours every semester for ING Director's Discretionary Time (DDT) using WEAVE LIFU mode only. PIs who wish to request DDT should contact

ddt_requesting.iac.es

with a brief science case that justifies the urgency and scientific impact, and specifies the requested observations. The above email will reach both the ING Director and the Head of Astronomy who will assess the requested observations as soon as possible. Requests can be submitted at any time.

If the DDT request is approved, then the PI submits a DDT proposal using a phase-1 form provided. Phase-2 preparation follows the same process for triggering a WEAVE target-of-opportunity observation. Execution will depend on instrument availability and overall night-time constraints.

Data ownership and publication follows the same policy as with WEAVE open-time data (see section Data ownership and publication on the WEAVE Open-Time Programme page.

We kindly ask authors preparing a paper using WEAVE DDT data to let ING know in advance of the publication, and to give proper acknowledgement to the use of the WHT and WEAVE in any published papers, copying the following paragraph (update the proposal reference):

Based on observations made with the William Herschel Telescope operated on the island of La Palma by the Isaac Newton Group of Telescopes in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. These observations were obtained under the ING DDT programme (WEAVE proposal XXXXXXXXX).

Followed by this WEAVE acknowledgement.

Listed below are approved DDT proposals.