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"26164 results found.
- 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
- GRB 110212A: GRT Optical Observation
- GRB 110212A, Swift-BAT refined analysis
- GRB 110212A: SARA-N Optical Limits
- GRB110212A: BOOTES-2/TELMA optical limits
- GRB 110212A: ROTSE-III Optical Limits
- GRB 110212A: Swift detection of a burst
- GRB 110207A: Suzaku WAM observation of the prompt emission
- 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: Swift detection of a burst
- Fermi GBM detection of a burst from 1E 1841-045
- Swift/UVOT observations of GRB110208a
- GRB 110205A: Suzaku WAM observation of the prompt emission
- GRB 110208A: Swift-XRT refined Analysis
- GRB 110208A: Swift-BAT refined analysis
- GRB 110208A: Swift detection of a burst
- SGR-like outburst from the magnetar 1E 1841-04.5
- GRB 110207A: Fermi GBM observation
- GRB 110207A: TAROT Calern observatory optical observations
- GRB 110206A: GROND detection of afterglow candidate
- GRB 110207A: Swift-BAT refined analysis
- GRB 110206A: UVOT detection of afterglow candidate
- GRB 110207A: MASTER prompt and early optical observations
- Konus-Wind observation of GRB 110205A
- GRB 110207A: Swift detection of a burst
- GRB 110206A: Swift detection of a probable X-ray afterglow
- GRB 110206A: TAROT La Silla observatory optical observations
- GRB 110205A: Lightbuckets Optical Observations
- GRB 110205A: Swift/UVOT Continuing Observations
- Observations GRB 110205A
- GRB 110205A: Swift-BAT refined analysis
- GRB 110205A: Newcastle Observatory Optical Observations
- GRB 110205A: Swift-XRT refined Analysis
- GRB 110205A: PAIRITEL NIR Afterglow Detection
- GRB 110205A: TAROT Calern observatory detection of an optical flare
- GRB 110205A: ROTSE-III, Optical Counterpart is flaring to ~14 mag
- GRB 110205A: TAROT Calern observatory optical detection
- GRB 110205A: Swift detection of a burst with an optical candidate
- GRB 110128A: Fermi GBM detection
- GRB 110201A: Swift-XRT refined Analysis
- Swift/UVOT observations of GRB110201A
- GRB 110201A: Swift-BAT refined analysis
- GRB 110201A: Swift detection of a burst
- GRB 110125A: Fermi GBM detection
- GRB 110128A, Swift-BAT refined analysis
- GRB 110128A: Swift/UVOT observations
- GRB 110128A: Swift-XRT refined Analysis
- GRB 110120A: Suzaku WAM observation of the prompt emission
- GRB 110128A: TAROT Calern observatory upper limits
- GRB 110128A: Swift detection of a burst
- Konus-Wind observation of GRB 110120A
- GRB 110123A: Fermi GBM detection
- GRB 110120A: MASTER optical observations
- GRB 110120A: Fermi LAT detection
- IPN triangulation of GRB 110120A
- GRB 110119A: Fermi GBM detection
- GRB 110120A: Fermi GBM detection
- GRB 110119A: Suzaku WAM observation of the prompt emission
- GRB110119: Swift/UVOT Detection
- GRB 110119A: Swift-XRT refined Analysis
- GRB 110119A: Swift-BAT refined analysis
- GRB 110119A: PAIRITEL NIR Afterglow Detection
- GRB 110119A: Swift detection of a burst with an optical detection
- Swift-BAT trigger 442771 is a noise fluctuation
- GRB 101219B: Likely the GRB host emission dominates now in the uvw2 filter
- New feature in Fermi GBM GRB Ground Position Notices
- Swift-BAT Trigger 442539 is not a GRB
- Swift Trigger 442539 is probably not a GRB
- GRB101225A - timing analysis
- GRB 110112B: Fermi GBM observation
- The Christmas burst GRB 101225A - optical spectroscopy with GTC
- GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
- GRB 110112A: MITSuME Akeno and Okayama optical upper limits
- GRB 110112A: Swift-XRT refined Analysis
- GRB 110112A: Swift/UVOT upper limits
- GRB 110112A: Swift-BAT refined analysis
- GRB 110112A: Swift detection of a possible short burst
- GRB 110107A: Swift-XRT Afterglow Candidate
- GRB 110107A detected in ground analysis of BAT slew data
- GRB 110106B: Fermi GBM detection