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"23151 results found.
- GRB 080904: Fermi Gamma-ray Burst Monitor detection
- Swift Trigger 324122 is again known source Swift J1842.5-1124
- Swift Trigger 324116 is known source again
- Swift Trigger 324112 is known source Swift J1842.5-1124
- GRB 080906, Swift-BAT refined analysis
- GRB 080906: GROND observations of the optical/NIR afterglow
- GRB 080905B: Refined UVOT Analysis
- GRB 080905B: VLT redshift
- GRB 080905B, Swift-BAT refined analysis
- GRB 080905A, Swift-BAT refined analysis
- GRB 080906: Swift detection of a burst with optical afterglow
- GRB 080905A: Swift-XRT Refined Analysis
- GRB080825C: Fermi-LAT observations
- GRB 080905B: Swift detection of a burst with possible optical counterpart
- GRB 080905: Swift detection of a probably-short burst
- GRB 080903, Swift-BAT refined analysis
- GRB 080903: optical observations
- GRB 080903: Astrotel-Caucasus optical observations
- GRB 080903: Optical afterglow candidate
- GRB 080903: TAROT Calern observatory optical observations
- GRB 080903: Swift detection of a burst
- SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
- SGR 0501+4516: preliminary results of the first XMM-Newton observation
- INTEGRAL ToO observation of SGR0501+4516
- SGR 0501+4516: Confirmation of the NIR counterpart
- SGR 0501+4516: Detection of possible optical counterpart
- Swift trigger 322590: BAT detection of a possible burst
- GRB 080828: SuperAGILE GRB Localization
- SGR 0501+4516: Proximity to supernova remnant HB9
- SGR 0501+4516: Swift XRT measure of the spin period
- GRB080823: Fermi Gamma-ray Burst Monitor detection
- GRB 080824: Fermi Gamma Ray Burst Monitor detection
- Konus-Wind observation of GRB 080825B
- SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
- GRB 080825B: GRB Localization by SuperAGILE
- Konus-Wind observations of new SGR 0501+4516
- INTEGRAL ToO Observation of SGR0501+4516
- GRB 080822B, Swift-BAT refined analysis
- Trigger 321551: Continued Large Flaring of SGR 0501+4516
- SGR 0501+4516: optical observations
- Swift Trigger 321481: A Large Flare from SGR 0501+4516
- GRB 080822B: Swift detection of a burst
- GRB080818B: GLAST Burst Monitor detection
- New Soft Gamma Repeater 0501+4516 was GRB 080822
- GRB 080822: Swift detection of a short burst
- GLAST Burst Monitor detection of a GRB: 080816B
- GLAST Burst Monitor detection of GRB 080818
- GLAST Burst Monitor detection of GRB080817B
- GRB 080810: RTT150 optical observations
- GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
- GLAST Burst Monitor detection of GRB 080810
- GRB 080810: Liverpool and Faulkes North observations
- GRB 080810: RTT150 optical observations
- GRB080810: MITSuME optical observation
- GRB 080810: optical observations
- GRB 080810: D50 optical observation
- GRB 080810: RTT150 optical observations
- GRB 080810: KANATA optical-NIR observation, update
- GRB 080810, Swift-BAT refined analysis
- GRB 080810 : optical observation with KANATA
- GRB 080810: Swift detection of a burst with a bright optical afterglow
- GRB 080805: VLT redshift update
- GRB 080727B: Late VLT imaging
- GRB 080804: Swift/UVOT Refined Analysis
- GRB 080805, Swift-BAT refined analysis
- GRB 080804, Swift-BAT refined analysis
- GRB 080805: VLT redshift
- GRB 080805: Afterglow confirmation
- GRB 080805: Swift detection of a burst
- GRB 080804: Swift detection of a burst with optical afterglow
- GRB 080802, Swift-BAT refined analysis
- GRB 080802: Swift detection of a probable burst
- GRB 080727C: Suzaku WAM observation of the prompt emission
- GRB 080727C: TAROT Calern observatory optical observations
- GRB 080727C, Swift-BAT refined analysis
- GRB 080727C: Swift/UVOT Upper Limits
- Konus-Wind observation of GRB 080727B
- GRB080727C: RTT150 optical observations
- GRB 080727C: Swift detection of a burst
- Swift detection of XTE J1701-407
- BAT Trigger 318150 is not a GRB
- GRB 080727B, Swift-BAT refined analysis
- GRB 080727A, Swift-BAT refined analysis
- GRB 080727B: KAIT observations
- GRB 080727B: Swift detection of a bright burst
- GRB 080727: Swift detection of a burst
- GRB 080726: GRB Localization by SuperAGILE
- GRB 080725, Swift-BAT refined analysis
- Konus-Wind observation of GRB 080723B
- GRB 080725: Swift detection of a burst
- GRB 080723A: Swift/UVOT Upper Limits
- GRB 080723, Swift-BAT refined analysis
- GRB 080723B: AGILE GRID and MCAL results
- GRB 080723A: Swift-XRT refined analysis
- GRB 080723B: Detection and Localization by SuperAGILE
- GRB 080723B : a long GRB detected with INTEGRAL
- GRB 080723: Swift detection of a burst
- GRB 080721 : Lulin 2nd optical follow-ups
- GRB 080721: OA fading and redshift
- TNG/DOLORES redshift for GRB080721