| Band | Ref. CAT | PI | Allocated time | Instrument | Title |
|---|
| A | 69-GTC47/20A | Hans J. Deeg | 20 A (0.5hrs) | Osiris | Being ready when it wakes up: Resolving the mystery of the 'Where's the flux' star |
| A | 100-GTC71/20A | Pablo G. Pérez-González | D (36hrs) | MEGARA | A comprehensive view of the end of Reionization with GTC and JWST |
| A | 142-GTC111-A/20A | Josefa Becerra González | 13 A (1hrs) | Osiris | Characterizing the diversity of neutron star mergers and their kilonovae |
| A | 142-GTC112-B/20A | Josefa Becerra González | 12 A (1hrs) | EMIR | Characterizing the diversity of neutron star mergers and their kilonovae |
| A | 93-GTC64/20A | María Rosa Zapatero Osorio | A (20hrs) | HORuS | Transit spectroscopy of Kelt-24b and WASP-74b with HORuS |
| A | 95-GTC65/20A | Nuria Huelamo | G (35hrs) | MEGARA | The BORN survey of forming planets in disks around young stars: summer targets with GTC/MEGARA |
| A | 118-GTC85-A/20A | David Alexander Kann | 1 A (5hrs) | EMIR | GTC follow-up of LIGO/VIRGO O3 gravitational waves in the electromagnetic domain |
| A | 118-GTC86-B/20A | David Alexander Kann | 1 A (8hrs) | Osiris | GTC follow-up of LIGO/VIRGO O3 gravitational waves in the electromagnetic domain |
| A | 118-GTC87-C/20A | David Alexander Kann | 1 D (2hrs) | MEGARA | GTC follow-up of LIGO/VIRGO O3 gravitational waves in the electromagnetic domain |
| A | 129-GTC96/20A | Martin Guerrero Roncel | A (2hrs) | MEGARA | Final Step in the MEGARA 3D mapping of the inside-out planetary nebula HuBi 1 |
| A | 37-GTC24/20A | Enric Palle Bago | A (22hrs) | Osiris | Probing the transition from cloudy to clear atmospheres for hot gas-giant exoplanets |
| B | 42-GTC28-A/20A | Alberto Rebassa Mansergas | A (8.1hrs) | HORuS | A Gaia sample of dusty white dwarfs |
| B | 42-GTC29-B/20A | Alberto Rebassa Mansergas | A (21.5hrs) | EMIR | A Gaia sample of dusty white dwarfs |
| B | 136-GTC105/20A | Christina Thoene | G (24hrs) | Osiris | A giant datacube of NGC 6946 to obtain pre-explosion spectroscopy of potential SN progenitors |
| B | 52-GTC35/20A | Ignacio Ferreras | G (20.4hrs) | MEGARA | The role of environment in the formation of relic massive ultracompact galaxies |
| B | 76-GTC52/20A | Lluís Galbany | 5 A (2hrs) | Osiris | Follow-up of infant supernovae within 48h from explosion |
| B | 58-GTC38/20A | Mar Mezcua Pallerola | G (8hrs) | Osiris | Searching for Intermediate-mass Black Holes with Hyperluminous X-ray Sources |
| B | 19-GTC10/20A | Carina Fian | G (15hrs) | Osiris | Reverberation mapping of the Fe III [2039-2113] feature in quasars |
| B | 122-GTC89/20A | Michael Beasley | G (16.3hrs) | Osiris | Jewels in the Hat: Deep spectroscopy of Globular Clusters in the Sombrero Galaxy |
| B | 134-GTC100/20A | Raúl de la Fuente Marcos | D (7.5hrs) | Osiris | Investigating slow interstellar comet candidates with GTC |
| B | 137-GTC106-A/20A | Alberto Javier Castro Tirado | 10 A (0.4hrs) | Osiris | GTC follow-up of gravitational radiation sources in the Multi-messenger Era |
| B | 137-GTC107-B/20A | Alberto Javier Castro Tirado | 14 A (1hrs) | Osiris | GTC follow-up of gravitational radiation sources in the Multi-messenger Era |
| B | 137-GTC108-D/20A | Alberto Javier Castro Tirado | 6 A (1hrs) | EMIR | GTC follow-up of gravitational radiation sources in the Multi-messenger Era |
| B | 81-GTC55/20A | Cristina Ramos Almeida | A (11hrs) | EMIR | A comprehensive view of AGN feedback and its impact on galaxy evolution |
| B | 87-GTC60-A/20A | Javier Román García | D (16.1hrs) | Osiris | Probing the relic nature of the UGC 7321 superthin galaxy |
| B | 87-GTC61-B/20A | Javier Román García | D (2.1hrs) | Osiris | Probing the relic nature of the UGC 7321 superthin galaxy |
| B | 135-GTC101-C/20A | Ismael Pérez Fournon | 10 A (1hrs) | Osiris | Measuring Time Delays of Strongly Lensed Supernovae for Precision Cosmology |
| B | 135-GTC102-D/20A | Ismael Pérez Fournon | 3 A (1hrs) | Osiris | Measuring Time Delays of Strongly Lensed Supernovae for Precision Cosmology |
| B | 135-GTC103-E/20A | Ismael Pérez Fournon | 12 A (1hrs) | EMIR | Measuring Time Delays of Strongly Lensed Supernovae for Precision Cosmology |
| B | 135-GTC104-F/20A | Ismael Pérez Fournon | 3 A (1hrs) | EMIR | Measuring Time Delays of Strongly Lensed Supernovae for Precision Cosmology |
| B | 108-GTC78-A/20A | Miriam García García | D (1hrs) | Osiris | Signaling star formation in metal-poor dwarf galaxies: Massive stars in Leo A. |
| B Visitor | 108-GTC79-B/20A | Miriam García García | D (8hrs) | Osiris | Signaling star formation in metal-poor dwarf galaxies: Massive stars in Leo A. |
| B | 77-GTC53/20A | Jorge Sanchez Almeida | G (24hrs) | Osiris | Bona-Fide galaxies with metallicity inhomogeneities due to accretion-triggered star formation |
| B | 102-GTC72-A/20A | Javier Licandro Goldaracena | 4 A (1hrs) | Osiris | Characterizing new discovered faint Main Belt Comets |
| B | 102-GTC73-B/20A | Javier Licandro Goldaracena | 2 A (1hrs) | Osiris | Characterizing new discovered faint Main Belt Comets |
| B | 51-GTC34/20A | Teodoro Muñoz Darias | 10 A (1hrs) | Osiris | X-ray Binary Transients: High excitation emission lines, wind and nebulae. |
| B Visitor | 107-GTC77/20A | Manuel Linares Alegret | G (6.5hrs) | Osiris | The hunt for the most massive neutron stars: PSR J1908+2105 |
| B | 9-GTC5/20A | Kazushi Iwasawa | G (29.3hrs) | Osiris | Revealing "hidden" population of obscured quasars in the early Universe |
| B | 125-GTC92/20A | Bililign Tsige Dullo | D (10hrs) | MEGARA | The First Mass Measurement for a Globular Cluster Poor Ultra-Diffuse Galaxy: Are there Two Types of Ultra-Diffuse Galaxy? |
| B | 146-GTC116-A/20A | Stefan Geier | G (16hrs) | Osiris | Resolving the quasar selection bias with Gaia |
| B | 115-GTC83/20A | Nikolay Britavskiy | G (42hrs) | Osiris | The role of episodic mass loss in the evolution of massive stars |
| B | 4-GTC4/20A | Pilar Ruiz Lapuente | 4 G (6.25hrs) | Osiris | Study of dark energy with supernovae at z > 1, within the Subaru program using the Hyper Suprime Camera and the GTC |
| B | 90-GTC63/20A | Eduardo Martin Guerrero de Escalante | G (18hrs) | MEGARA | Constraints on the close binary frequency of young planetary mass objects |
| B | 109-GTC80/20A | Helmut Dannerbauer | A (12hrs) | EMIR | Confirming starbursting Planck protoclusters at z=2 |
| B | 28-GTC21/20A | Rui Marques Chaves | G (15hrs) | Osiris | Investigating the Lya emission and nature of ionization source in the most luminous galaxy in the EoR |
| B | 45-GTC30/20A | Riccardo Scarpa | G (4.5hrs) | Osiris | Probing a new "Einstein Cross" gravitational lens |
| B | 126-GTC93/20A | Jesus Falcon Barroso | D (14hrs) | MEGARA | Dwarf Galaxies as Probes of Fundamental Galaxy Trends |
| B | 144-GTC114/20A | Elham Eftekhari | A (13hrs) | EMIR | Stellar population gradients of nearby isolated elliptical galaxies in near IR with EMIR |
| C | 66-GTC42/20A | Francisco Najarro de la Parra | A (12hrs) | EMIR | Massive binaries and colliding winds in the Quintuplet Cluster |
| C | 97-GTC67-A/20A | Nancy Elias Rosa | G (18hrs) | Osiris | Looking at the Gap Transients from a new perspective |
| C | 97-GTC68-B/20A | Nancy Elias Rosa | A (3hrs) | EMIR | Looking at the Gap Transients from a new perspective |
| C | 98-GTC69/20A | Nancy Elias Rosa | G (22hrs) | Osiris | Peeking into the Very Center of Stellar Explosions with GTC Nebular Spectroscopy. |
| C | 145-GTC115/20A | Manuel Ángel Pérez Torres | D (12hrs) | Osiris | A dynamical study of the black hole candidate Swift J1858.6-0814 |
| C | 80-GTC54/20A | Sara Cazzoli | G (24hrs) | MEGARA | Outflows and feedback in LLAGNs as seen by MEGARA |
| C | 128-GTC95/20A | Helmut Dannerbauer | A (36hrs) | EMIR | Deep K-band Imaging of the brightest Herschel Galaxies |
| C | 1-GTC1/20A | Luis Julián Goicoechea Santamaría | A (3.2hrs) | EMIR | NIR spectroscopy of gravitationally lensed quasars |
| C | 20-GTC11/20A | Enrique Herrero Casas | A (9hrs) | Osiris | Ground-based reflectance spectrum of an exoplanet |
| C | 55-GTC36/20A | Grzegorz Nowak | A (6.1hrs) | Osiris | Constraining the age-activity relationship for M dwarfs across the age of the Galaxy |
| C | 123-GTC90/20A | Jackeline Suzett Rechy Garcia | A (1.5hrs) | MEGARA | Tomography of Compact Planetary Nebulae with Fast Jets |
| C | 17-GTC9/20A | Anastasio Díaz Sánchez | A (2hrs) | EMIR | Near IR Spectroscopic Characterization of the Lensed Ultrabright Submillimetre Galaxy 'Cosmic Eyebrow' |
| C | 61-GTC40/20A | Shuowen Jin | G (12.4hrs) | Osiris | Quasars with recent rapid change in the photometric states |
| C | 99-GTC70/20A | Helmut Dannerbauer | A (24hrs) | EMIR | Spectroscopic follow up of the Herschel-Planck Selected Protoclusters |
| C | 133-GTC99/20A | Christina Thoene | G (17hrs) | MEGARA | 3D kinematics and abundances in SLSN hosts with MEGARA |
| C | 140-GTC109-A/20A | Antonio de Ugarte Postigo | G (7hrs) | Osiris | Connecting GRBs and the Star-Formation-Rate Density: An Unbiased Optical/NIR Host-Galaxy Survey |
| C | 140-GTC110-B/20A | Antonio de Ugarte Postigo | A (8hrs) | EMIR | Connecting GRBs and the Star-Formation-Rate Density: An Unbiased Optical/NIR Host-Galaxy Survey |
| C | 96-GTC66/20A | Jose M Diego Rodriguez | G (48hrs) | EMIR | Measuring the Magnification of the Host Galaxy of Supernova Refsdal and Lensed Blue Supergiant Icarus |
| C | 74-GTC51/20A | Juan Fabregat Llueca | G (2.7hrs) | Osiris | Classical Be star populations in very low metallicity environments: the galaxies Sextans A and B. |
| C | 143-GTC113-A/20A | Giuseppina Battaglia | G (15hrs) | HORuS | The biggest Splash |
| C | 60-GTC39/20A | Jorge García Rojas | G (10.3hrs) | MEGARA | Constraining the abundance discrepancy factor-orbital period relation in planetary nebulae with post-common envelope binary central stars |
| C | 41-GTC27/20A | Bruno Rodriguez Del Pino | A (39hrs) | EMIR | Characterizing the Halpha emission from the galaxy overdensity BOSS1441 at z = 2.32 |
| C | 40-GTC26/20A | Bruno Rodriguez Del Pino | D (6hrs) | Osiris | Unraveling the nature of the high velocity gas associated to the off-nuclear HII region of J133944.15+274635.2 |
| C | 130-GTC97/20A | Christina Thoene | G (9.5hrs) | MEGARA | The host-galaxy environments of short GRBs with MEGARA |
| C | 26-GTC20/20A | Romano Corradi | D (2.5hrs) | Osiris | Stellar multiplicity in planetary nebulae: Sh 2-71 |
| C | 47-GTC32/20A | Riccardo Scarpa | A (21hrs) | Osiris | Unveiling the nature of unidentified gamma-ray sources: the fourth 2019 Fermi catalog. |
| C | 63-GTC41/20A | Rafael Luque | A (9hrs) | Osiris | Probing the atmosphere of WASP-74b |
| Filler | 24-GTC19/20A | Mercedes Mollá Lorente | A (75hrs) | MEGARA | MEGARA Spectral Library (filler proposal) |
| Filler | 2-GTC2/20A | Jesús Maíz Apellániz | A (60hrs) | Osiris | The Galactic O-Star Spectroscopic Survey (GOSSS): the faint northern sample |
| Filler | 39-GTC25/20A | Carlos Allende Prieto | A (50hrs) | HORuS | Looking for the site of the r-process nucleosynthesis |
| Filler | 57-GTC37/20A | Julia de Leon Cruz | A (20hrs) | Osiris | Visible spectra of near-Earth asteroids accesible to spacecraft |
| Filler | 104-GTC75/20A | Javier Licandro Goldaracena | A (40hrs) | Osiris | Alauda and Theobalda, a link between worlds: from outer-belt families to main-belt comets |
| Filler | 127-GTC94/20A | Pablo Rodríguez Gil | A (64hrs) | Osiris | Toward a complete understanding of compact binary evolution |
| Filler | 85-GTC59/20A | Virginia Cúneo | A (30.4hrs) | Osiris | Optical disc winds from accreting white dwarfs |