GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"35428 results found.
- GRB 070518: Swift-XRT refined analysis
- GRB 070517: Gemini optical imaging
- GRB070518: OSN observation
- GRB 070518, Swift-BAT refined analysis
- GRB 070518: OT confirmed form Xinglong TNT observation
- GRB 070518: Swift detection of a burst with optical afterglow
- GRB 070517, Swift-BAT refined analysis
- GRB 070517: Optical search
- GRB 070517: Swift detection of a burst
- GRB 070509: objects inside XRT error circle
- GRB 070512: pseudo-z ~ 1.39 from prompt emission spectrum
- GRB 070512: IPN localization and Konus spectrum of a bright burst
- GRB070419A: optical observations
- GRB 070419A, Deep LBT photometry
- GRB 070508: pseudo-z from 4 different spectral analyses
- GRB 070509: Swift/UVOT Upper Limits
- Konus-Wind and Konus-A observation of GRB 070508
- Swift-BAT trigger 278987 is not a GRB
- GRB 070510: Swift detection of a possible burst
- GRB070509: Swift-XRT Refined Analysis
- GRB 070508: OA fading and tentative redshift
- GRB 070509, Swift-BAT refined analysis
- GRB 070508: Suzaku/WAM observation of the prompt emission
- GRB 070509: REM observations
- GRB 070509: Swift detection of a burst
- GRB 070509: ROTSE-III Optical Limits
- GRB070508: Swift/UVOT Observations
- GRB 070508, SMARTS optical afterglow observation
- GRB 070508, Swift-BAT refined analysis
- GRB 070508: Multicolor optical observations and possible redshift limit
- GRB 070508: Swift-XRT refined analysis
- GRB 070508: Optical observation limiting magnitude
- GRB 070508: Optical afterglow detection
- GRB 070508: REM observations
- GRB 070508: TAROT La Silla observatory optical observations
- GRB 070508: Swift detection of an intense burst with an optical counterpart
- Swift-BAT trigger 278809 is not a GRB
- GRB 070507: Swift detection of a possible cosmic ray shower event or a possible burst
- GRB 070506: VLT redshift
- GRB070506: Swift XRT refined analysis
- GRB 070506, Swift-BAT Refined Analysis
- GRB 070506: Swift detection of a burst with optical afterglow
- GRB 070412, deep LBT imaging
- GRB 070429A: Swift XRT further analysis
- GRB070429B: VLT observations
- GRB 070429A: optical observations
- GRB 070309: Swift-XRT afterglow confirmation
- GRB070429B: possible host galaxy detection
- VLA observation of GRB 070429B
- Swift/UVOT observations of GRB070429B
- GRB 070429B, Swift-BAT refined analysis
- Swift/UVOT observations of GRB070429A
- GRB 070429A: Swift XRT refined analysis
- GRB 070429A, Swift-BAT refined analysis
- GRB 070429A: optical and NIR observations
- GRB 070429B: Swift XRT refined analysis
- GRB 070429B: ROTSE-III Optical Limits
- GRB 070429B: Swift detection of a short burst
- GRB 070429: What's the temperature?
- GRB 070429: ROTSE-III Optical Limits
- GRB 070429: Swift detection of a burst
- GRB 070427, Swift-BAT Refined Analysis
- LT monitoring of GRB070412
- GRB 070427: Swift detection of a burst
- GRB 070411, further deep LBT photometry
- GRB 070411: Late-time Keck imaging
- GRB 070411 : Planned XMM-Newton observation
- GRB070419B: Suzaku WAM observation of the prompt emission
- GRB 070420, SMARTS optical/IR afterglow observations
- GRB 070411, deep LBT photometry
- GRB 070420: pseudo-z~1.56 from spectral parameters of the prompt
- Konus-Wind observation of GRB 070420
- GRB 070411: break in the optical light curve
- GRB 070420 Swift-BAT Refined Analysis
- GRB070419a: Swift UVOT observations
- GRB 070419A: MARGE Observations
- GRB 070420: optical rebrightening observed at Mt. John
- GRB 070420: Swift XRT refined analysis
- GRB 070411: BART early limit
- GRB 070420: Faulkes Telescope South Observations
- GBR 070419A: Swift/XRT refined analysis
- GRB 070420: TAROT La Silla observatory optical observations
- GRB 070420: NIR and optical afterglow confirmed
- GRB 070420: Swift detection of a burst with optical afterglow
- GRB 070419A: MITSuME Okayama Observations
- GRB 070419A: Early Super-LOTIS Observations
- GRB 070419B, Swift-BAT refined analysis
- GRB 070419A Swift-BAT Refined Analysis
- GRB 070419A: RAPTOR Detection of Early Emission
- GRB 070419B: Swift XRT refined analysis
- GRB 070419: Keck/LRIS Absorption Redshift
- GRB 070419B: optical afterglow confirmation
- GRB 070419A, Optical observations
- GRB 070411: Deep VLT detection
- GRB070419 - SDSS Pre-Burst Observations
- GRB 070419A: SARA observations
- GRB 070419A: NAYUTA Optical Observation
- GRB 070419A: Faulkes Telescope North Optical Observations
- GRB 070419B optical afterglow candidate
- GRB 070419A: Optical and IR observations with KANATA