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"741 results found.
- GRB 080825B: Swift-XRT team analysis
- GRB 080825B: GRB Localization by SuperAGILE
- GRB 080723B: XMM-Newton observation
- GRB 080726: GRB Localization by SuperAGILE
- ATCA radio upper limit on GRB 080723B
- GRB 080723B - Swift-XRT refined analysis
- GRB 080723B - Swift-XRT position
- GRB 080723B: AGILE GRID and MCAL results
- GRB 080723B: Detection and Localization by SuperAGILE
- GRB 080625: Swift/UVOT Follow-Up Observations
- GRB 080625: Swift/UVOT Detection of an Optical Afterglow
- GRB 080625: Gamma Ray Burst Localization by SuperAGILE
- GRB 080514B: Spectroscopic constraints and probable host galaxy
- GRB 080607: AGILE-MCAL observation of the prompt emission
- GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
- Errartum: VLA upper limit on GRB 080507
- VLA upper limit on GRB 080705
- GRB 080514B: Swift-XRT analysis
- GRB 080514B: possible AGILE detection at E>50 MeV
- GRB 080514B: SuperAGILE/IPN GRB Localization
- GRB 080507: Keck photometry
- GRB 080507: E Pur Si Muove!
- GRB080507: Swift/UVOT followup observations
- GRB 080507: Optical Afterglow
- GRB 080507: GRB localization by SuperAGILE
- GRB 080408: Analysis of AGILE Gamma-ray data
- GRB 080408: GRB Localization by SuperAGILE
- GRB 080319C: AGILE-MCAL observation of the prompt emission
- GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
- IPN localization of very hard GRB 080204
- IPN triangulation of GRB080122
- IPN triangulation of very bright GRB 071125
- GRB 071104: Possible Swift UVOT Afterglow Candidate
- GRB 071104: Swift-XRT position
- GRB 071104: Gamma Ray Burst Localization by SuperAGILE
- Recent SGR1806-20 Activity
- IPN search for a GRB associated with TAROT transient on August 31
- GRB 070824 - Combined SuperAGILE/IPN Localization
- AGILE-ACS position for the SGR 1806-20 July 27 burst
- GRB 070724B: Analysis of AGILE gamma-ray data
- GRB 070724b: First Gamma Ray Burst Localization by SuperAGILE onboard