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"12307 results found.
- GRB 111103A: optical upper limit of Mt. Terskol observatory
- GRB 111211A: optical ovservations at Mt. Terskol observatory
- GRB 111208A found in ground analysis of BAT data
- GRB 111201A found in ground analysis of BAT data
- GRB 111117A: Fermi GBM observation
- GRB 111103B: optical upper limit of Mt. Terskol observatory
- GRB 111107A: Fermi GBM observation
- GRB 111103A: Fermi GBM observation
- GRB 111017A: Fermi GBM Detection
- GRB 111003A: Fermi GBM detection
- Fermi GBM triggers 110923481, 110924391 and 110925200 are not GRBs
- GCN for GRB 110921B
- GRB 110921A: Fermi GBM observation
- IPN triangulation of GRB 110918A (long duration, extremely intense)
- GRB 110903A: Fermi GBM observation
- GRB110825A: Fermi GBM observation
- IPN triangulation of GRB110825A (very intense, long-duration)
- Fermi GBM trigger 110823.518 is not a GRB
- GRB 110818A: Fermi GBM observation
- Fermi Gamma-ray Burst Monitor trigger 110809.346 is not a GRB
- Swift SGR 1834.9-0846: Swift-BAT refined analysis
- Fermi GBM detection of a SGR-like burst
- Fermi Gamma-ray Burst Monitor trigger 110806.263 is not a GRB
- Fermi GBM trigger 334123030 (110804165) is not a GRB
- EVLA observation for Fermi burst GRB 110721A
- GRB 110731A : Suzaku WAM observation of the prompt emission
- AXP 4U 0142+61: Fermi GBM detection
- Konus-Wind observation of GRB 110731A
- GRB 110731A: Fermi GBM observation
- Fermi-LAT Detection of GRB110731A
- GRB 110721A: Swift observations of afterglow candidate
- IPN triangulation of GRB 110721A
- GRB 110721A: Preliminary Swift/UVOT Upper Limits
- GRB 110721A: potential counterpart candidate
- Konus-Wind observation of GRB 110721A
- GRB 110721A: Fermi-LAT detection
- GRB 110721A: Fermi GBM detection
- Swift J1822.3-1606 : Fermi GBM observation
- Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
- Fermi Gamma-ray Burst Monitor trigger 332078586 is not a GRB
- GRB 110709A: Fermi GBM observation
- GRB 110705A: Suzaku WAM observation of the prompt emission
- Konus-Wind observation of GRB 110705A
- IPN triangulation of short hard GRB 110705A
- GRB 110705A: Fermi GBM detection
- GRB 110625A: Suzaku WAM observation of the prompt emission
- GRB 110625A: Fermi GBM and LAT observations
- GRB 110625A: Fermi LAT detection
- IPN triangulation of GRB110618A (long duration, extremely intense)
- Fermi Gamma-ray Burst Monitor trigger 110621949 is not a GRB
- GRB 110610A: Fermi GBM detection
- GRB 110529A: Fermi GBM detection
- LAT Observations of GRB110529A
- Fermi Gamma-ray Burst Monitor trigger 328195911 is not a GRB
- Radio observations of GRB 110428A with the EVLA
- GRB 110426A: Fermi GBM detection
- GRB 110428A: Fermi-GBM observation
- GRB 110428A: Suzaku WAM observation of the prompt emission
- Fermi-GBM data processing and delivery
- GRB 110428A : Swift-XRT observations
- Konus-Wind observation of GRB 110428A
- GRB 110428A: Fermi-LAT Detection
- GRB 110426A: MASTER synchronous with MAXI/GSC observations
- GRB 110420B: Fermi GBM observation
- GRB 110412A: Fermi GBM observation
- ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
- GRB 110401A: Fermi GBM detection
- GRB 110402A: Fermi GBM detection
- GRB 110402A: early optical limit by "Pi of the Sky"
- GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
- GRB 110328/Swift J164449.3+573451: Fermi observations
- GRB 110328B: Fermi-LAT Detection
- GRB 110328B: Fermi GBM detection
- Fermi Gamma-ray Burst Monitor trigger 322686470 (110324797) is not a GRB
- GRB 110319B: Swift/UVOT Upper Limits
- GRB 110319B found in ground analysis of Swift-BAT data
- GRB 110318A: Fermi GBM detection
- Fermi GBM trigger 321944155 (110316205) is not a GRB
- GRB 110301A: Fermi GBM detection
- No IPN GRB detected in conjunction with candidate GRB 110215
- Fermi GBM detection of an SGR-like burst
- Fermi GBM trigger 319534757 (110216319) is not a GRB
- GRB 110213A: Fermi GBM observation
- Fermi GBM detection of a burst from 1E 1841-045
- GRB 110207A: Fermi GBM observation
- GRB 110128A: Fermi GBM detection
- GRB 110125A: Fermi GBM detection
- GRB 110120A: Suzaku WAM observation of the prompt emission
- Konus-Wind observation of GRB 110120A
- GRB 110123A: Fermi GBM detection
- GRB 110106B, radio observations
- 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 110120A: MASTER optical observations
- New feature in Fermi GBM GRB Ground Position Notices
- GRB 110112B: Fermi GBM observation
- GRB 110107A: Swift-XRT Afterglow Candidate