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"27015 results found.
- GRB 080906: Swift detection of a burst with optical afterglow
- 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/UVOT Observations
- GRB 080903: Swift-XRT Refined Analysis
- GRB 080903, Swift-BAT refined analysis
- GRB 080903: Astrotel-Caucasus optical observations
- GRB 080903: TAROT Calern observatory optical observations
- GRB 080903: ROTSE-III Optical Limits
- GRB 080903: Swift detection of a burst
- GRB 080830: Fermi Gamma-ray Burst Monitor detection
- Swift-BAT trigger 322590 is not a GRB
- Swift trigger 322590: BAT detection of a possible burst
- SGR 0501+4516: XMM-Newton monitoring schedule
- SGR 0501+4516: Decline in Activity
- GRB080823: Fermi Gamma-ray Burst Monitor detection
- GRB 080824: Fermi Gamma Ray Burst Monitor detection
- GRB080825C: GLAST Burst Monitor detection
- SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
- Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
- GRB 080822B, Swift-BAT refined analysis
- SGR 0501+4516: UKIRT detection of possible infra-red counterpart
- Trigger 321551: Continued Large Flaring of SGR 0501+4516
- New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
- Swift Trigger 321481: A Large Flare from SGR 0501+4516
- SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
- GRB 080822B: Swift detection of a burst
- GRB080818B: GLAST Burst Monitor detection
- Third event from SGR 0501+4516
- 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
- GLAST Burst Monitor detection of GRB 080817
- GLAST Burst Monitor detection of GRB080816
- GLAST Burst Monitor detection of GRB 080812
- GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
- GLAST Burst Monitor detection of GRB 080810
- First GLAST Burst Monitor GRB Circulars
- GRB 080810: Swift/UVOT Refined Analysis
- GRB 080810: Kanazawa optical observation
- GRB 080810: Swift-XRT Team refined analysis
- GRB 080810: KANATA optical-NIR observation, update
- GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
- GRB 080810, Swift-BAT refined analysis
- GRB 080810: Swift detection of a burst with a bright optical afterglow
- GRB 080723B: XMM-Newton observation
- GRB 080805: Swift/UVOT Upper Limits
- GRB 080804: Swift/UVOT Refined Analysis
- GRB 080805, Swift-BAT refined analysis
- GRB 080804, Swift-BAT refined analysis
- GRB080805 optical limit by "Pi of the Sky"
- GRB 080805: Swift detection of a burst
- GRB 080804: Swift detection of a burst with optical afterglow
- GRB 080804: ROTSE-III Detection of Optical Counterpart
- GRB 080802: Swift/UVOT Upper Limits
- GRB 080802: UVI Telescope Upper Limit
- 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 080727B: GROND redshift limit
- GRB 080727C, Swift-BAT refined analysis
- GRB 080727C: Swift/UVOT Upper Limits
- Konus-Wind observation of GRB 080727B
- GRB 080727C: Swift XRT refined analysis
- GRB080727C: RTT150 optical observations
- GRB 080727C: Swift detection of a burst
- Swift detection of XTE J1701-407
- GRB 080727B: Swift/UVOT Upper Limits
- BAT Trigger 318150 is not a GRB
- GRB 080727B: Swift-XRT refined analysis
- GRB 080727B, Swift-BAT refined analysis
- GRB 080727A, Swift-BAT refined analysis
- GRB 080727A: Swift-XRT refined analysis
- GRB080727A: Swift/UVOT Upper Limits
- GRB 080727B: Swift detection of a bright burst
- GRB 080727: Swift detection of a burst
- GRB 080725, Swift-BAT refined analysis
- GRB 080725: REM prompt observations
- GRB 080725: Swift detection of a burst
- GRB 080723A: Swift/UVOT Upper Limits
- GRB 080723B - Swift-XRT refined analysis
- GRB 080723B - Swift-XRT position
- GRB 080723, Swift-BAT refined analysis
- GRB 080723A: Swift-XRT refined analysis
- GRB 080723B: Detection and Localization by SuperAGILE
- GRB 080723: Swift detection of a burst
- GRB 080721: UVOT Follow-Up Observations
- Konus-Wind observation of GRB 080721
- GRB 080721: Swift-XRT refined analysis
- GRB 080721, Swift-BAT refined analysis
- GRB 080721: Swift/UVOT Photometric Redshift
- GRB 080721: Swift detection of a burst with a bright optical counterpart.
- Retraction of Swift Trigger 317393
- Trigger 317393: Swift detection of a possible GRB
- Trigger 317205: Swift detection of an outburst from XTE J1701-407
- GRB 080714: GROND confirmation of the optical/NIR afterglow