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"3039 results found.
- GRB 090410: Swift detection of a burst
- GRB 090404: NOT observations
- GRB 090404: Swift detection of a burst
- GRB 090401B: Swift-BAT refined analysis
- GRB 090401B: Swift detection of a burst
- GRB 090320B: Fermi GBM detection.
- IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
- GRB 090308: Swift detection of a burst
- GRB 090306B: Burst detection from Swift-BAT slew data
- Konus-RF catches first GRB and SGR bursts
- GRB 090301A: Swift-BAT refined analysis
- IPN localization of GRB 090217
- SGR activity seen by BAT during ICSP Ionospheric Events
- GRB 090201: Swift-BAT refined analysis
- AXP 1E1547.0-5408: RHESSI observations up to 400 keV
- AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
- GRB 090112: Fermi GBM detection
- GRB 081224: Suzaku WAM observation of the prompt emission
- GRB 081226: GROND afterglow candidate
- GRB 081222, Swift-BAT refined analysis
- GRB 081221, Swift-BAT refined analysis
- IPN localization of short hard GRB 081216
- GRB 081203A: Optical observations of Xinglong TNT telescope
- GRB 081203A: Swift-BAT refined analysis
- GRB 081203: Swift detection of a burst with a bright optical counterpart
- GRB 081128: Swift-BAT refined analysis
- GRB081121: Refined Swift/UVOT observations
- GRB 081121: Swift-BAT refined analysis
- GRB081121: Swift/UVOT observations
- GRB 081121: ROTSE-III Detection of Optical Counterpart
- GRB081118 : optical upper limit
- GRB 081024C: Fermi Gamma-ray Burst Monitor detection
- SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
- GRB 081028, Swift-BAT refined analysis
- Swift detection of a possible burst (trigger 332287)
- Detection of flare star Algol in Swift-BAT slew data
- GRB 081008: Galaxy associated with z=1.967 absorber
- Swift-BAT triggered on the flare star Algol
- GRB 081008 optical upper limit
- GRB 081011: Swift/XRT detection
- GRB081008: Swift/UVOT observations
- GRB 081008: Swift detection of a burst with optical afterglow
- GRB 081008: ROTSE-III Detection of Optical Counterpart
- GRB 081007: Swift detection of a burst with optical afterglow
- Trigger 324561: IGR J08408-4503 detected by Swift
- GRB 080916A: GROND lightcurve
- GRB 080916C: GROND Detection of the Optical Afterglow Candidate
- GRB080916A: Refined Swift/UVOT Observations
- GRB 080916A, Swift-BAT refined analysis
- GRB 080916: REM detection of the NIR afterglow
- GRB 080916: REM candidate afterglow
- GRB 080916: Swift detection of a burst with optical afterglow
- GRB 080915B, Swift-BAT refined analysis
- GRB 080913, Swift-BAT refined analysis
- Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
- GRB 080905B: Watcher optical detection
- GRB 080905B: Swift detection of a burst with possible optical counterpart
- GRB 080903, Swift-BAT refined analysis
- GRB 080830: Fermi Gamma-ray Burst Monitor detection
- INTEGRAL ToO observation of SGR0501+4516
- SGR 0501+4516: Decline in Activity
- SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
- GRB 080825B - optical counterpart candidate
- SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
- GRB 080727C, Swift-BAT refined analysis
- GRB 080727B: Swift/UVOT Upper Limits
- GRB 080727B, Swift-BAT refined analysis
- GRB 080727: Swift detection of a burst
- GRB 080721: UVOT Follow-Up Observations
- GRB 080721 : Lulin Optical follow-ups
- GRB 080721: Swift detection of a burst with a bright optical counterpart.
- Refined analysis of Swift Trigger 316063, is IGR J08408-4503
- GRB 080613B - NOT optical and IR nondetections
- GRB 080605, Swift-BAT refined analysis
- GRB 080605, Swift-BAT refined analysis
- GRB 080605: MASTER VWF 46 s AT observation
- GRB 080605: Swift detection of a burst with an optical afterglow
- GRB 080603B, Swift-BAT refined analysis
- Swift analysis of BAT Slew Survey event (Trigger=009)
- GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
- GRB 080520, Swift-BAT refined analysis
- GRB 080514B: Suzaku WAM observation of the prompt emission
- GRB 080515, Swift-BAT refined analysis
- GRB 080515: Swift detection of a burst
- GRB080506: Swift/UVOT observations
- GRB 080506, Swift-BAT refined analysis
- GRB080503, RIMOTS optical upper limit
- GRB 080506: TLS afterglow detection in VRIZ
- GRB 080506: Swift detection of a burst with optical afterglow
- GRB 080503: Swift detection of a short burst
- GRB080430: Optical observation in AsU CAS Ondrejov & Brno
- GRB 080420?: Swift detection of a possible short burst
- GRB 080413B, Swift-BAT refined analysis
- GRB 080409: Swift detection of a burst
- GRB080330: Swift XRT refined analysis
- Konus-Wind observation of GRB 080328
- GRB080330: LOAO R-band Detection
- GRB 080320: Swift XRT refined analysis
- GRB 080320: J detection with FLAMINGOS
- GRB 080320: Gemini-N optical afterglow