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23A Green Bank Observatory Time Allocation Committee Report

A total of 74 proposals requesting NSF funded “open skies” time were submitted to the Green Bank Observatory’s Robert C. Byrd Green Bank Telescope (GBT) for semester 23A. Proposals are reviewed on a competitive basis with a panel review system (see Proposal Review System). Below are the statistics by proposal count and hours. The oversubscription is the ratio of the number of submitted proposals to the number of approved proposals. The pressure is the ratio of the requested time to the available time in hours. Here we only include proposals submitted for the 23A semester that have been reviewed by the Green Bank Observatory Telescope Allocation Committee (TAC).

A description of the 23A proposals accepted can be found here.

Statistics by Proposal Count

Total Proposals	74
Approved	33
Filler	14
Rejected	29
Hold	0
Withdrawn	0
Oversubscription	2.24

Statistics by Proposal Hours

Requested Time	2548.67 hours
Available Time	1777 hours
Approved	785.75 hours
Filler	612.25 hours
Rejected	1150.67 hours
Pressure	2.4

GBT Pressure Plots

Observations in high frequency bands require better weather conditions than observations in lower frequency bands. The GBT uses three weather categories: poor (for observations below 8 GHz), good (observations between 8-18 GHz and 26.5-50 GHz), and excellent (observation in the 18-26.5 GHz band and above 50 GHz). The first three figures below show the pressure plots for each these weather categories. The last figure includes all weather categories. The black horizontal line shows the total available hours. The letters A, B, and C correspond to the priorities assigned by the TAC where A and B are approved time and C is filler time. Carryover is time allocated by a TAC from a previous semester that is being executed in the 23a semester.

GBT Observation Preparation

Please use the GBT Dynamic Scheduling System (DSS) to enable observing sessions, select observers for your project, and enter your blackout dates. The DSS Home Page has additional information about the DSS. See GBT Observing for information about how to prepare for your observations.

Please note that the DSS uses the average Right Ascension (RA) and Declination (Dec) of all sources within a session. The average RA and Dec will be used to determine when the session can be scheduled. You will need to carefully check the RA and Dec, along with the minimum and maximum session lengths, to make sure that these values are satisfactory and will allow all your sources to be observed before enabling the session.

A total of 74 proposals requesting NSF funded “open skies” time were submitted to the Green Bank Observatory’s Robert C. Byrd Green Bank Telescope (GBT) for the August 1, 2022 semester 23A deadline . The table below summarizes the approved observing programs. Listed are the PI name, proposal ID, proposal title, maximum hours approved and proposal type (Regular, Triggered, Large or External). Proposals from previous semesters that were awarded time in the 23A semester are included. The table also includes HSA and GMVA proposals that were awarded time on the GBT as a VLBI station as well as proposal accepted via external agreements with CHANDRA, Hubble Space Telescope, FERMI, SOFIA, Swift, and XMM.

For each approved program, the Proposal Finder Tool will have access to its author, title, abstract and total approved hours. A description of the Time Allocation Committee report for 23A can be found here.

PI	ID	Title	Hours	Type
Alexander, Kate	GBT23A-273	Monitoring the Exceptional Jetted Tidal Disruption Event AT2022cmc	17.5	Regular
Archibald, Anne	GBT23A-307	Continued Timing of a Millisecond Pulsar in a Stellar Triple System  – copy	25	Regular
Bolatto, Alberto	GBT21B-024	GBT EDGE: A Representative Survey of the z=0 Universe with Full IFU Spectroscopy	300	Large
Busch, Michael	GBT23A-132	Searching for OH in the nuclear wind of the Milky Way	20	Regular
Busch, Michael	GBT22A-434	SC:Mapping molecular clouds in OH from diffuse to high-mass star forming regions	300	Large
Cameron, Andrew	GBT23A-160	Continued observations of an eccentric, relativistic binary pulsar.	57	Regular
Cohen, Tyler	GBT23A-364	Timing Properties of Millisecond Pulsar Profile Shapes	34	Regular
Corcoran, Kyle	GBT23A-376	Follow-up of a Gaia Sample of Candidate Neutron Star and Black Hole Binaries	7	Regular
Di Teodoro, Enrico	GBT23A-131	Measuring 12CO(1-0) emission in the Milky Way’s Nuclear Wind	6.5	Regular
Fonseca, Emmanuel	GBT23A-356	Followup Timing of Low-declination GBNCC Pulsars	8	Regular
Frayer, David	GBT22B-162	GBT HI Observations of the GOALS LIRG 3C84	2	Regular
Ginsburg, Adam	GBT23A-268	From ACES to TENS: The Central Molecular Zone with MUSTANG	6	Regular
Gupta, Harshal	GBT21B-316	Molecular Exploration of the Diffuse Interstellar mediUM (MEDIUM)	285.75	Large
Issaoun, Sara	GMVA22B-249	Resolving Polarization in Sgr A* with GMVA+ALMA	10	Regular
Johnson, Bradley	GBT23A-245	Continuing the Search for Axion Dark Matter in Andromeda with VEGAS	18	Regular
Jones, Michael	GBT23A-080	Gas content of a new class of stellar system in the Virgo cluster	24.5	Regular
Jones, Michael	GBT23A-084	Cold gas reservoirs of satellites in nearby Milky Way-like systems	74	Regular
Kania, Joseph	GBT23A-371	Narrow Band Quasi-periodic Fast Radio Burst	20	Regular
Kim, Daewon	VLBA23A-316	Exploring the innermost jet regions of the blazar BL Lac with the HSA and EHT	14	Regular
Kim, Jae-Young	GMVA23A-031	First subparsec-scale imaging of the new TeV gamma-ray radio galaxy 3C 264	8	Regular
Kramer, Michael	GBT22B-231	Timing and General Relativity in the Double Pulsar System	101	Regular
Ladu, Elisabetta	VLBA23A-234	Evidence for a new disk maser in the LINER galaxy IC485.	8	Regular
Lewandowska, Natalia	GBT23A-322	A study of potentially new single pulses in the Crab pulsar	1.25	Regular
Lowe, Ian	GBT22B-068	A Multi-Scale, Multi-Wavelength Study of Dust in Molecular Cloud Filaments II	21.5	Regular
Luo, Gan	GBT23A-246	An OH and CH survey of the molecular clouds in the outer-disk of the Milky Way	53	Regular
Lynch, Ryan	GBT23A-295	A Pilot GBT Pulsar Survey of the Galactic Plane	216	Regular
Mason, Brian	GBT22B-242	Measuring 3mm Source Contamination in the ACT Galaxy Cluster Sample	18.75	Regular
Maureira, Maria Jose	GBT22B-180	CO freeze-out across a filamentary dense cloud forming a quadruple system	25.5	Regular
McEwen, Alexander	GBT23A-332	The GBT 820MHz Survey: Confirmation of New Pulsar Candidates	6.25	Regular
McGuire, Brett	GBT23A-047	Closing the Loop: PAHs Toward Cyg OB2-12	6	Regular
McKee, James	GBT23A-315	Broadband observations of giant pulses from PSR J0218+4232	8	Regular
McKee, James	GBT23A-318	Continued monitoring of PSR J2108+45: a binary with a circumstellar environment	16.5	Regular
Mckinven, Ryan	GBT23A-334	Polarimetric Follow-up of Repeating FRB Sources in Dynamic Environments	30	Triggered
Michail, Joseph	VLBA23A-078	Joint EHT, JWST, VLA, and VLBA+GBT Observations of Sgr A* in April 2023	6	Regular
Ocker, Stella	GBT23A-088	An Ultra-Wideband Study of Repeating Fast Radio Bursts	16.5	Regular
Paraschos, Georgios Filippos	GMVA23A-033	Revealing the jet launching in 3C84 at the highest detail	15	Regular
Parent, Emilie	GBT23A-367	Pinpointing the onset of radio pulsations in a new transitional pulsar candidate	6	Triggered
Park, Jongho	VLBA23A-118	Probing the Jet Base of M87 in the Time Domain	30	Regular
Park, Jongho	GMVA22B-100	A Multicolor View of the Black Hole Environment in M87	28	Regular
Pearlman, Aaron	GBT23A-155	A Search for Prompt and Periodic Emission from Nearby Repeating FRBs	20	Triggered
Perez, Karen	GBT23A-142	3FGL J0838.8-2829: A Redback Binary MSP Candidate	4	Regular
Peters, Wendy	GBT23A-330	A Candidate Pulsar in Glimpse-C01	10.5	Regular
Pineda, Jaime	GBT23A-199	Ions vs Neutrals in a Dense Core – copy	18	Regular
Possenti, Andrea	GBT23A-206	The magnetar-FRB link: simultaneous Radio/X-Ray monitoring of active magnetars	19.5	Triggered
Ransom, Scott	GBT22B-256	Long Term Timing of 65 Recycled Pulsars in Bulge Globular Clusters	75	Regular
Robishaw, Timothy	GBT23A-339	Confirmation of Magnetic Field Detection in CRRL Emission from DR 21	33	Regular
Romero, Charles	GBT23A-086	SZ Constraints of Shocks in CIZA J2242.8+5301	40	Regular
Roth, Nathan	GBT22B-176	Measuring NH3 and OH in a Target of Opportunity Comet with the GBT	7.5	Triggered
Route, Matthew	GBT23A-286	A Multiband Search for Radio Emission Among the Coolest Ultracool Dwarfs	31.5	Regular
Salas, Pedro	GBT22A-437	SC: GBT Diffuse Ionized Gas Survey at Low frequencies – GDIGS-Low	826	Large
Sarazin, Craig	GBT23A-028	Bridges of Intergalactic Gas Connecting ACT Cluster Pairs	35	Regular
Schmiedeke, Anika	GBT23A-360	Exploring the kinematics in a filamentary infrared dark cloud	40	Regular
Schmiedeke, Anika	GBT22B-191	Feeding a super-critical filament in a subsonic core	17.5	Regular
Scibelli, Samantha	GBT22A-435	SC: Q- Band Chemical Complexity Survey of Prestellar Core L1544	647	Large
Shirley, Yancy	GBT23A-161	PROBING DUST OPACITY VARIATIONS: MUSTANG-2 IMAGING OF THE PRESTELLAR CORE L183	12	Regular
Singal, Jack	GBT19A-083	How Bright is the Radio Sky?  A 310 MHz Absolute Map	30	Regular
Song, Yiqing	GBT22B-248	Mapping HCN and HCO+ in Local Luminous Infrared Mergers	19.5	Regular
Spekkens, Kristine	GBT22B-139	Atomic Gas in the Host Galaxies of Gravitational Wave Events – LVK O4	40	Triggered
Spezzano, Silvia	GBT22B-040	Exploring the chemistry of Sulfur towards the young starless core L1521E	18	Regular
Squillace, Alessandra	GBT23A-263	A Survey of 15-Nitrogen Fractionation in Prestellar Cores	36	Regular
Stark, David	GBT22A-436	SC: Robust Gas Measurements for BreakBRD Galaxies	206.5	Large
Stephens, Ian	GBT23A-288	Mapping Ammonia in Bones: Understanding our Magnetized Spiral Potential	132	Regular
Swihart, Samuel	GBT23A-301	Two New Spider Millisecond Pulsars	7.25	Regular
Tang, Ningyu	GBT23A-185	HI and OH survey toward Taurus B213 region with extremely low HINSA abundance	35	Regular
Thomas, Reshma Anna	GBT23A-365	Regular monitoring of FRB 20190520B RM variations	43	Regular
Tremblay, Chenoa	GBT23A-042	Magnetic Fields in Star Formation through Simultaneous Observations of CH and OH	5	Regular
Urquhart, James	GBT23A-350	Search of Hypercompact HII Regions Towards Methanol Masers	56.25	Regular
Wakker, Bart	GBT23A-344	Observing HI column densities to measure HVC metallicities	155	Regular
Wen, Di	G22A001	A magnified view of an ionised scattering medium in a z= 1.145 late- type galaxy	36	Regular
Yang, Chentao	GBT22B-020	Confirming the nature of a 380GHz H2O maser disk in a lensed quasar at z=3.91	14	Regular