| Band | Ref. CAT | IP | Number hours | Instrument | Program |
|---|
| A | 83-GTC78/23B | Cesar Esteban Lopez | D (16hrs) | Osiris | Abundance discrepancy and temperature fluctuations in low-metallicity HII regions |
| A | 12-GTC8/23B | Carlos M. Gutierrez De la Cruz | D (20hrs) | Osiris | Solving the degeneracy in photoz estimation methods for an optimum exploitation of Euclid |
| A | 53-GTC48-A/23B | David Jones | 12 G (1.8hrs) | Osiris | Multi-wavelength target of opportunity follow-up of newly-discovered luminous red novae |
| A | 53-GTC49-B/23B | David Jones | 12 A (1hrs) | EMIR | Multi-wavelength target of opportunity follow-up of newly-discovered luminous red novae |
| A Visitor | 66-GTC59-A/23B | Marie-Lou Gendron Marsolais | G (4hrs) | MEGARA | Black Hole-Driven Motion of the Filaments in M87 |
| A Visitor | 66-GTC60-B/23B | Marie-Lou Gendron Marsolais | G (2hrs) | MEGARA | Black Hole-Driven Motion of the Filaments in M87 |
| A | 58-GTC53/23B | Cristina Ramos Almeida | D (9.8hrs) | MEGARA | Investigating the impact of quasar-driven outflows on the young stellar populations of massive galaxies |
| A | 84-GTC79/23B | Cesar Esteban Lopez | D (21hrs) | Osiris | The radial abundance gradient of the outer disc of M31 from HII region spectra |
| A | 50-GTC46/23B | Mark Gieles | G (11.7hrs) | MEGARA | Kinematics of multiple populations in NGC5024 |
| A | 75-GTC64/23B | Miriam García García | D (19.5hrs) | Osiris | Physics and Evolution of Massive Stars at the very early Universe. |
| A | 97-GTC100/23B | Carlos Allende Prieto | G (15hrs) | Osiris | The Search and Characterization of the Most Primitive Stars in the Galaxy |
| A Visitor | 56-GTC52/23B | Javier Olivares Romero | A (24.5hrs) | EMIR | Spectroscopy of L dwarfs in the Pleiades |
| B | 17-GTC13/23B | Jerry Jun-Yan Zhang | G (3.75hrs) | Osiris | Completing the sample of metal-poor T dwarfs with GTC OSIRIS z-band photometry |
| B | 39-GTC37/23B | Jerry Jun-Yan Zhang | A (21.8hrs) | EMIR | Methane dwarf or no? |
| B | 24-GTC21-A/23B | Alberto Javier Castro Tirado | 10 A (0.4hrs) | Osiris | GTC follow-up of gravitational radiation sources in the Multi-messenger Era |
| B | 24-GTC22-B/23B | Alberto Javier Castro Tirado | 14 A (1hrs) | Osiris | GTC follow-up of gravitational radiation sources in the Multi-messenger Era |
| B | 24-GTC23-C/23B | Alberto Javier Castro Tirado | 6 A (1hrs) | EMIR | GTC follow-up of gravitational radiation sources in the Multi-messenger Era |
| B | 103-GTC106-A/23B | Josefa Becerra González | 1 D (20hrs) | Osiris | Characterizing the electromagnetic counterparts of gravitational waves |
| B | 103-GTC107-B/23B | Josefa Becerra González | 1 A (10hrs) | EMIR | Characterizing the electromagnetic counterparts of gravitational waves |
| B | 62-GTC55/23B | Mireia Montes Quiles | D (10hrs) | Osiris | Revealing the shape of ultra-diffuse galaxies to test their formation scenario |
| B | 105-GTC108/23B | Bahar Bidaran | D (28hrs) | MEGARA | On the origin of isolated red sequence dwarf galaxies in voids |
| B | 30-GTC30-A/23B | Lluís Galbany | 8 A (1hrs) | Osiris | Rapid ToO Spectroscopy of Infant Supernovae with GTC in the optical and NIR |
| B | 30-GTC31-B/23B | Lluís Galbany | 8 A (2hrs) | EMIR | Rapid ToO Spectroscopy of Infant Supernovae with GTC in the optical and NIR |
| B | 34-GTC34/23B | Jesús Gallego Maestro | D (14.5hrs) | Osiris | An observational test of the existence of a Golden Mass as the origin of the mass quenching in the galaxy formation and evolution scenario |
| B | 19-GTC15-A/23B | Nancy Elias Rosa | G (10hrs) | Osiris | Peeking into the Very Center of Stellar Explosions with GTC Nebular Observations |
| B | 19-GTC16-B/23B | Nancy Elias Rosa | G (13hrs) | Osiris | Peeking into the Very Center of Stellar Explosions with GTC Nebular Observations |
| B | 64-GTC57/23B | Teodoro Muñoz Darias | 10 A (1hrs) | Osiris | X-ray Binary Transients: accretion disc winds and nebulae. |
| B | 65-GTC58/23B | Tariq Shahbaz | D (4.6hrs) | MEGARA | The peculiar chemical abundance in binary millisecond pulsars |
| B | 32-GTC32/23B | Zohreh Ghaffari | D (8hrs) | Osiris | A galaxy cluster core at z=1.1 with a swarm of blue star-forming galaxies |
| B | 52-GTC47/23B | Pablo Corcho Caballero | D (15hrs) | MEGARA | Kinematic analysis of recently quenched low-mass galaxies |
| B | 61-GTC54/23B | Antonio Martínez-Henares | G (12.7hrs) | MEGARA | Characterization of disk structure and evolution in young massive stars |
| B | 87-GTC82-A/23B | Felipe Murgas Alcaíno | A (10hrs) | Osiris | Seeking evidence for clear atmospheres of hot Saturns |
| B | 87-GTC83-B/23B | Felipe Murgas Alcaíno | A (11hrs) | Osiris | Seeking evidence for clear atmospheres of hot Saturns |
| B | 89-GTC88/23B | Ignacio Martín-Navarro | G (28hrs) | MEGARA | M-SALSA - Megara Survey of Andromeda gLobular cluSter Abundances |
| B | 106-GTC109-B/23B | Matteo Monelli | D (3.75hrs) | Osiris | Homogeneous photometry in the Gaia era: understanding the formation of globular clusters |
| B | 81-GTC73-A/23B | José Feliciano Agüí Fernández | 1 A (8hrs) | EMIR | GTC follow-up of binary-merger induced Kilonovae in the electromagnetic domain |
| B | 81-GTC74-B/23B | José Feliciano Agüí Fernández | 1 A (8hrs) | Osiris | GTC follow-up of binary-merger induced Kilonovae in the electromagnetic domain |
| B | 81-GTC75-C/23B | José Feliciano Agüí Fernández | 1 D (2hrs) | MEGARA | GTC follow-up of binary-merger induced Kilonovae in the electromagnetic domain |
| B | 81-GTC76-D/23B | José Feliciano Agüí Fernández | 6 A (1hrs) | Osiris | GTC follow-up of binary-merger induced Kilonovae in the electromagnetic domain |
| B | 99-GTC102-A/23B | José Feliciano Agüí Fernández | 5 A (1.8hrs) | EMIR | GRBs, their progenitors and their environments |
| B | 99-GTC103-B/23B | José Feliciano Agüí Fernández | 8 A (1.3hrs) | Osiris | GRBs, their progenitors and their environments |
| B | 82-GTC77/23B | Maria Luisa Garcia Vargas | D (6.3hrs) | MEGARA | A deep spectroscopic blue mapping of Leoncino galaxy with MEGARA IFU |
| B | 33-GTC33-A/23B | Rafael Barrena | D (10hrs) | Osiris | Galaxy Cluster dynamics at the endpoint of structure formation |
| B | 14-GTC10/23B | David Garcia Alvarez | A (14.5hrs) | EMIR | Determining accurate physical properties of dusty Red Supergiants in low metallicity galaxies II |
| B | 98-GTC101/23B | Chiara D'Eugenio | A (20hrs) | EMIR | Deep near-infrared imaging of a statistical sample of groups and clusters at 2 |
| B | 101-GTC105/23B | José Feliciano Agüí Fernández | G (23hrs) | MEGARA | 3D kinematics and abundances in SLSN hosts with MEGARA |
| B | 46-GTC40-B/23B | Francisco Prada | 1 A (7.5hrs) | Osiris | Spectro-photometric light curves for kilonovae from GW-LVK O4 run: Equation of state and Hubble constant determination |
| B | 46-GTC41-C/23B | Francisco Prada | 1 A (10.5hrs) | Osiris | Spectro-photometric light curves for kilonovae from GW-LVK O4 run: Equation of state and Hubble constant determination |
| B | 46-GTC42-D/23B | Francisco Prada | 1 A (4.5hrs) | Osiris | Spectro-photometric light curves for kilonovae from GW-LVK O4 run: Equation of state and Hubble constant determination |
| B | 46-GTC43-E/23B | Francisco Prada | 1 A (7.5hrs) | EMIR | Spectro-photometric light curves for kilonovae from GW-LVK O4 run: Equation of state and Hubble constant determination |
| B | 46-GTC44-F/23B | Francisco Prada | 1 A (4.5hrs) | EMIR | Spectro-photometric light curves for kilonovae from GW-LVK O4 run: Equation of state and Hubble constant determination |
| B | 27-GTC29/23B | Antonio Manuel García Rodríguez | G (12.5hrs) | EMIR | Probing Black hole mass cosmic evolution with GTC+EMIR |
| B | 77-GTC65-A/23B | Rubén Sánchez Ramírez | 3 A (2hrs) | Osiris | Investigating the physical origins and radiation mechanisms of peculiar long GRBs |
| B | 77-GTC66-B/23B | Rubén Sánchez Ramírez | 4 A (2hrs) | Osiris | Investigating the physical origins and radiation mechanisms of peculiar long GRBs |
| B | 77-GTC67-C/23B | Rubén Sánchez Ramírez | 4 A (1.5hrs) | EMIR | Investigating the physical origins and radiation mechanisms of peculiar long GRBs |
| B | 77-GTC68-D/23B | Rubén Sánchez Ramírez | 8 A (0.8hrs) | Osiris | Investigating the physical origins and radiation mechanisms of peculiar long GRBs |
| B | 77-GTC69-E/23B | Rubén Sánchez Ramírez | 8 A (0.5hrs) | EMIR | Investigating the physical origins and radiation mechanisms of peculiar long GRBs |
| B | 77-GTC70-F/23B | Rubén Sánchez Ramírez | 2 A (1hrs) | EMIR | Investigating the physical origins and radiation mechanisms of peculiar long GRBs |
| B | 77-GTC71-G/23B | Rubén Sánchez Ramírez | 2 A (1.5hrs) | Osiris | Investigating the physical origins and radiation mechanisms of peculiar long GRBs |
| B | 25-GTC24-A/23B | Lluís Galbany | 2 A (1.5hrs) | Osiris | Photometric and spectroscopic follow-up of two gravitational wave electromagnetic counterparts with the GTC |
| B | 25-GTC25-B/23B | Lluís Galbany | 2 A (11hrs) | Osiris | Photometric and spectroscopic follow-up of two gravitational wave electromagnetic counterparts with the GTC |
| B | 25-GTC26-C/23B | Lluís Galbany | 2 A (2hrs) | EMIR | Photometric and spectroscopic follow-up of two gravitational wave electromagnetic counterparts with the GTC |
| B | 25-GTC27-D/23B | Lluís Galbany | 2 A (8hrs) | EMIR | Photometric and spectroscopic follow-up of two gravitational wave electromagnetic counterparts with the GTC |
| B | 16-GTC12/23B | Raquel Fores Toribio | D (5hrs) | Osiris | Measuring the redshift of the lensed source in B0445+123 to determine H0. |
| B | 43-GTC39/23B | José Miguel Torrejón Vázquez | D (11hrs) | MEGARA | Revealing the donor of an ULX: optical spectroscopy of Ho II X-1 |
| B | 112-GTC110-D/23B | Frédérick Poidevin | 1 D (10hrs) | Osiris | Paving the way to cosmology with Superluminous Supernovae |
| B | 18-GTC14/23B | Stefano Zarattini | D (5.5hrs) | Osiris | The faint-end slope of the luminosity function of the fossil cluster Abell 267 |
| C | 63-GTC56-B/23B | Marusa Zerjal | G (25hrs) | Osiris | Chronological study of the low-mass population of the sigma Orionis open cluster |
| C | 13-GTC9/23B | Giovanna Speranza | D (19hrs) | Osiris | The quest for high redshift radio galaxies: spectroscopic confirmation of 18 z>4 candidates |
| C | 79-GTC72/23B | Maria Cruz Galvez Ortiz | G (24.5hrs) | EMIR | Confirming the binary nature of ultra cool dwarfs with EMIR |
| C | 90-GTC89/23B | Erika Benitez Lizaola | G (5.1hrs) | MEGARA | "Disclosing the kinematics at kpc-scales in a sample of DPAGN and dual-AGN with MEGARA" |
| C | 72-GTC63/23B | Stefano Zarattini | G (44.5hrs) | Osiris | Searching for high-redshift leakers in LAEs at the epoch of reionisation |
| C | 86-GTC81/23B | Hannu Parviainen | D (20hrs) | Osiris | Origin of the complex transiting signals in WD 1054-226 |
| C | 22-GTC20/23B | Enrique Miguel García Zamora | A (30hrs) | Osiris | Spectroscopic follow-up of peculiar Gaia white dwarfs identified by means of artificial inteligence algorithms |
| C | 36-GTC36/23B | Zhengyi Chen | G (2.5hrs) | MEGARA | To search for tentative outflow in a dwarf lenticular galaxy PGC44685 with Wolf-Rayet features |
| C | 8-GTC6/23B | David Garcia Alvarez | A (10hrs) | Osiris | Why are rapidly rotating M dwarfs flare inactive as seen by TESS? |
| C | 5-GTC2-A/23B | María Caballero García | D (6hrs) | Osiris | Identifying the nature of UV transients discovered with Swift UVOT during GW follow-up |
| C | 20-GTC17/23B | Gianluca Lombardi | D (30hrs) | Osiris | The environment of galaxies in a multiple merger of clusters |
| C | 94-GTC92-A/23B | Maria Luisa Garcia Vargas | D (7.9hrs) | MEGARA | Studying the evolutionary status and kinematics of eXtremely Metal Deficient (XMD) gas-rich galaxies in nearby voids with MEGARA. |
| C | 94-GTC93-B/23B | Maria Luisa Garcia Vargas | G (5.9hrs) | MEGARA | Studying the evolutionary status and kinematics of eXtremely Metal Deficient (XMD) gas-rich galaxies in nearby voids with MEGARA. |
| C | 94-GTC94-C/23B | Maria Luisa Garcia Vargas | G (3.4hrs) | MEGARA | Studying the evolutionary status and kinematics of eXtremely Metal Deficient (XMD) gas-rich galaxies in nearby voids with MEGARA. |
| C | 94-GTC95-D/23B | Maria Luisa Garcia Vargas | D (7.9hrs) | MEGARA | Studying the evolutionary status and kinematics of eXtremely Metal Deficient (XMD) gas-rich galaxies in nearby voids with MEGARA. |
| C | 94-GTC96-E/23B | Maria Luisa Garcia Vargas | G (5.9hrs) | MEGARA | Studying the evolutionary status and kinematics of eXtremely Metal Deficient (XMD) gas-rich galaxies in nearby voids with MEGARA. |
| C | 94-GTC97-F/23B | Maria Luisa Garcia Vargas | G (5.9hrs) | MEGARA | Studying the evolutionary status and kinematics of eXtremely Metal Deficient (XMD) gas-rich galaxies in nearby voids with MEGARA. |
| C | 94-GTC98-G/23B | Maria Luisa Garcia Vargas | D (5.2hrs) | MEGARA | Studying the evolutionary status and kinematics of eXtremely Metal Deficient (XMD) gas-rich galaxies in nearby voids with MEGARA. |
| C | 94-GTC99-H/23B | Maria Luisa Garcia Vargas | D (7.9hrs) | MEGARA | Studying the evolutionary status and kinematics of eXtremely Metal Deficient (XMD) gas-rich galaxies in nearby voids with MEGARA. |
| C | 114-GTC111/23B | José Feliciano Agüí Fernández | G (24hrs) | Osiris | Pre-explosion spectroscopy of potential SN progenitors in NGC 2403 |
| Filler | 55-GTC51/23B | David Jones | A (60hrs) | Osiris | Complementary optical spectroscopy to HST Treasury FUV Survey of the Hottest White Dwarfs |
| Filler | 71-GTC62/23B | Anna Francesca Pala | A (18hrs) | Osiris | The 300 pc sample of Cataclysmic Variables |
| Filler | 48-GTC45/23B | Fabricio Manuel Pérez Toledo | A (60hrs) | Osiris | AGN Reverberation Mapping at Intermediate Redshift |
| Filler | 26-GTC28/23B | Riccardo Scarpa | A (16.5hrs) | Osiris | Looking for neutrino sources with optical telescopes |
| Filler | 6-GTC4/23B | Miriam García García | G (30hrs) | Osiris | Spectroscopic follow-up of the first massive binary detected in Sextans-A. |
| Filler | 92-GTC90/23B | Ignacio Negueruela Díez | A (35hrs) | Osiris | The distant and obscured Milky Way |
| Filler | 1-GTC1/23B | Jesús Maíz Apellániz | A (60hrs) | Osiris | Spectroscopic follow-up of the cross-match of the OB stars in the ALS catalog with Gaia |
| Filler | 35-GTC35/23B | Julia de Leon Cruz | A (20hrs) | Osiris | Visible spectra of newly discovered near-Earth asteroids, PHAs, and NEAs accesible to spacecraft |
| Filler | 100-GTC104/23B | Javier Licandro Goldaracena | A (20hrs) | Osiris | Quasi-Hildas: a link between Hildas and Centaurs |
| Filler | 69-GTC61/23B | Alba Aller Egea | A (33.5hrs) | Osiris | Confirmation of new binary central stars of PNe candidates detected by TESS |
| Filler | 54-GTC50-A/23B | Jose Luis Ortiz Moreno | A (20hrs) | Osiris | Photometry and astrometry of relevant TransNeptunian Objects |
| Filler | 93-GTC91/23B | Maria Luisa Garcia Vargas | A (75hrs) | MEGARA | MEGASTAR. MEGARA-GTC Stellar Library |
| Filler | 21-GTC18-A/23B | Martin Guerrero Roncel | A (12hrs) | EMIR | Near-IR Observations of Nova Remnants |
| Filler | 21-GTC19-B/23B | Martin Guerrero Roncel | A (3hrs) | EMIR | Near-IR Observations of Nova Remnants |