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"42564 results found.
- GRB 110318A: Swift detection of a burst
- Fermi GBM trigger 321944155 (110316205) is not a GRB
- GRB 110315A: RTT150 optical observations
- GRB 110315A: Swift/UVOT Upper Limits
- GRB 110315A: Swift-XRT refined Analysis
- GRB 110315A: Swift-BAT refined analysis
- GRB 110315A: Enhanced Swift-XRT position
- GRB 110315A: MASTER early optical observations
- GRB 110315A: Swift detection of a burst
- GRB 110312A: RTT150 optical observations
- GRB 110312A: Swift-XRT refined Analysis
- GRB 110312A: GROND Upper Limits
- GRB 110312A: Enhanced Swift-XRT position
- 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-XRT refined Analysis
- GRB 110305A: Enhanced Swift-XRT position
- 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 110223A: optical upper limits
- GRB 110301A: Fermi GBM detection
- GRB101225A: early EVLA Observations of Christmas Burst
- No IPN GRB detected in conjunction with candidate GRB 110215
- GRB GRB 110223A: MASTER VWF early optical observations
- IBAS distribution of coordinates for low significance INTEGRAL GRB triggers
- 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 110223A: Enhanced Swift-XRT position
- GRB 110223B: Enhanced Swift-XRT position
- GRB 110223B: Swift-BAT refined analysis
- GRB 110223B: GROND Detection of Optical Afterglow Candidate
- GRB 110223A: Observations from BOOTES-2
- GRB 110223B: Swift detection of a burst
- GRB 110223A: Swift detection of a burst
- OT 110215: Further NIR observations from NOT of the GRB candidate
- GRB110213B: X-ray afterglow confirmation
- Fermi GBM detection of an SGR-like burst
- Swift XRT and UVOT Observations of OT 110215
- OT 110215: NIR observations from NOT of GRB candidate
- GRB 110213A: optical observations in CrAO
- GRB 110213B: GROND observations of the optical/NIR afterglow
- GRB 110213A: optical observations in Mondy
- Fermi GBM trigger 319534757 (110216319) is not a GRB
- GRB110205A: EVLA Observations
- OT 110215: possible GRB from 2MASS J00264184+8324093
- GRB 110210A: optical upper limit
- GRB 110213B: Gemini South Redshift
- GRB 110213B: Possible Host Galaxy in SDSS Stripe 82 Imaging
- GRB 110213B: P60 Optical Afterglow Candidate
- GRB 110213A: TNT optical observations
- GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements
- GRB 110212A: Swift XRT and UVOT observations
- Swift GRB110213A: interesting behaviour
- GRB 110213A: Fermi GBM observation
- GRB 110205A: Konkoly optical observations
- GRB 110213B: Swift XRT observation
- Konus-Wind observation of GRB 110213A
- Konus-Wind observation of GRB 110213B
- GRB 110213A: Swift-XRT refined Analysis
- GRB 110213B: MAXI/GSC refined analysis
- GRB 110213A: Swift/UVOT refined analysis
- GRB 110213B: MAXI/GSC detection of a probable GRB
- GRB 110213A, Swift-BAT refined analysis
- GRB 110213A: optical observations
- GRB 110213A: Enhanced Swift-XRT position
- GRB 110213A: KAIT observations
- GRB 110213A: GRAS011 optical 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
- GRB 110212A: GRT Optical Observation
- GRB 110212A, Swift-BAT refined analysis
- GRB110212A: BOOTES-2/TELMA optical limits
- GRB 110212A: ROTSE-III Optical Limits
- GRB 110212A: Swift detection of a burst
- GRB 110201A: Subaru/MOIRCS Ks-band photometry
- Konus-Wind observation of GRB 110205A (correction to GCN 11659)
- GRB 110205A: detection of optical linear polarization from CAHA
- GRB 110207A: Suzaku WAM observation of the prompt emission
- GRB 110210A: optical upper limit
- GRB 110210A: Swift-XRT refined Analysis
- GRB 110205A: Swift/BAT and Suzaku/WAM joint spectral analysis
- GRB 110210A: Swift-BAT refined analysis
- Swift-BAT refined analysis of outburst from 1E 1841-04.5
- GRB 110210A: Enhanced Swift-XRT position
- GRB 110201A: optical observations
- GRB 110210A: Swift detection of a burst
- GRB 110206A: Swift-XRT confirmation of the X-ray afterglow
- GRB 110208A: Magellan confirmation of the optical afterglow
- Fermi GBM detection of a burst from 1E 1841-045
- Swift/UVOT observations of GRB110208a
- GRB 110205A: Suzaku WAM observation of the prompt emission