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"27046 results found.
- GRB 110402A: LOAO Optical Observation
- GRB 110401A: Fermi GBM detection
- GRB 110402A: Fermi GBM detection
- GRB 110328A/Swift J164449.3+573451: SARA-N detection
- GRB 110402A: Swift/UVOT detection of afterglow candidate
- GRB 110402A: Spectral lag indicates short hard burst
- Konus-Wind observation of GRB 110402A
- GRB 110402A: Konkoly observations
- GRB 110402A: Swift-BAT refined analysis
- GRB 110402A: Swift-XRT refined Analysis
- GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
- GRB 110402A: PAIRITEL NIR Upper Limits
- GRB 110402A: Liverpool Telescope Observations
- GRB 110402A: Swift detection of a burst
- GRB 110328A / Swift J164449.3+573451: Mondy optical observations
- GRB 110328A / Swift J164449.3+573451
- GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
- GRB 110328A / Swift J164449.3+573451: No optical variability of the optical counterpart
- GRB 110328A / Swift J164449.3+573451: BAT refined analysis
- GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
- GRB 110328A / Swift J164449.3+573451: optical observations
- GRB 110328B: Fermi-LAT Detection
- GRB 110328A / Swift J164449.3+573451: optical spectroscopy from GTC
- GRB 110328B: Fermi GBM detection
- GRB 110328A / Swift J164449.3+573451: NOT optical observations.
- GRB 110328A/ Swift J164449.3+573451 : Xinglong TNT Upper limit
- GRB / X-ray transient 110328A: Gemini optical observations
- GRB 110328A: a second trigger, probably a hard X-ray transient (Swift J164449.3+573451)
- GRB 110328A: Swift detection of a burst
- Fermi Gamma-ray Burst Monitor trigger 322686470 (110324797) is not a GRB
- GRB 110319B: Swift/UVOT Upper Limits
- GRB 110318B: Swift/UVOT Upper Limits
- GRB 110319B: GROND upper limits
- GRB 110319B: Swift-XRT afterglow candidate.
- GRB 110319B found in ground analysis of Swift-BAT data
- GRB 110319A: Swift/UVOT Detection
- GRB 110319A: Swift-BAT refined analysis
- GRB 110319A: Swift-XRT refined Analysis
- GRB 110318B: GROND upper limits
- GRB 110319A: Swift detection of a burst
- GRB 110318B: Swift-XRT refined Analysis
- GRB 110318A: Fermi GBM detection
- GRB 110318B: Swift-BAT refined analysis
- GRB 110318A: Swift-BAT refined analysis
- GRB 110318B: Swift/UVOT Non-Detection of an Afterglow
- GRB 110318B: Swift detection of a burst
- GRB 110318A: Swift detection of a burst
- Fermi GBM trigger 321944155 (110316205) is not a GRB
- GRB 110315A: Swift/UVOT Upper Limits
- GRB 110315A: Swift-XRT refined Analysis
- GRB 110315A: Swift-BAT refined analysis
- GRB 110315A: MASTER early optical observations
- GRB 110315A: Swift detection of a burst
- GRB 110312A: Swift/UVOT Upper Limits
- GRB 110312A: Swift-XRT refined Analysis
- GRB 110312A: GROND Upper Limits
- GRB 110312A: Swift-BAT refined analysis
- GRB 110312A: Swift detection of a burst
- GRB 110305A: REM detection of a possible NIR afterglow
- GRB 110305A: Swift/UVOT Upper Limits
- GRB 110305A: Swift-XRT refined Analysis
- GRB 110305A: Swift-BAT refined analysis
- IBAS trigger n. 6138 is not a GRB
- GRB 110305A: GROND Detection of Optical Afterglow
- GRB 110305A: Swift detection of a burst
- GRB 110301A: Fermi GBM detection
- Swift/UVOT observations of GRB110223A
- No IPN GRB detected in conjunction with candidate GRB 110215
- GRB GRB 110223A: MASTER VWF early optical observations
- Swift/UVOT observations of GRB110223b
- GRB 110223A: Swift-BAT refined analysis
- GRB 110223A : early optical limit by "Pi of the Sky"
- GRB 110223A: Liverpool Telescope observations
- GRB 110223A: Swift-XRT refined Analysis
- GRB 110223B: Swift-XRT refined Analysis
- GRB 110223B: Swift-BAT refined analysis
- GRB 110223B: GROND Detection of Optical Afterglow Candidate
- GRB 110223B: Swift detection of a burst
- GRB 110223A: Swift detection of a burst
- GRB 110213B: Swift/UVOT observations
- Fermi GBM detection of an SGR-like burst
- GRB 110213B: GROND observations of the optical/NIR afterglow
- Fermi GBM trigger 319534757 (110216319) is not a GRB
- Swift/UVOT observations of GRB110210a.
- GRB 110210A: ROVOR Upper Limit
- GRB 110213A: YNAO-GMG Observations
- GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements
- GRB 110212A: Swift XRT and UVOT observations
- GRB 110213A: Fermi GBM observation
- GRB 110205A: Konkoly optical observations
- Konus-Wind observation of GRB 110213A
- GRB 110213A: Swift-XRT refined Analysis
- GRB 110213A: Swift/UVOT refined analysis
- GRB 110213A: Lightbuckets Optical Observations
- GRB 110213A, Swift-BAT refined analysis
- GRB 110213A: KAIT observations
- GRB 110213A: Bok Telescope Redshift
- GRB 110213A: ROTSE-III Detection of Optical Counterpart
- GRB 110213A: P60 Optical Afterglow Detection
- GRB 110213A: Swift detection of a burst with optical afterglow