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"13 results found.
- GRB 250814A: CMO SAI and SAO RAS izJ observations.
- GRB 250814A: Further GRAWITA TNG NIR observations
- GRB 250814A: detection of the afterglow candidate with Liverpool Telescope
- GRB 250814A: GRAWITA TNG NIR observations
- GRB 250814A: Mondy optical observations of the candidate counterpart to LVK S250814bg
- GRB 250814A: P200/WIRC observations of the afterglow candidate
- GRB 250814A: possible optical afterglow candidate at Spanish observatories
- GRB 240814A: Fermi GBM Observation
- GRB 250814A: Possible afterglow candidate from P200/WIRC
- GRB 250814A: Optical observations with MDM Hiltner 2.4m telescope
- GRB 250814A: J-band upper limit from WINTER
- LIGO/Virgo/KAGRA S250814bg: Identification of a GW compact binary merger candidate possibly associated with GRB 250814A detected by Fermi GBM and Swift BAT
- GRB 250814A: Swift detection of a burst coincident with a subthreshold GW trigger