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"276 results found.
- Fermi-LAT Gamma-ray Observations of IceCube-260504A
- Fermi-LAT Gamma-ray Observations of IceCube-260425A
- Fermi-LAT Gamma-ray Observations of IceCube-260315A
- Fermi-LAT Gamma-ray Observations of IceCube-260217A
- Fermi-LAT Gamma-ray Observations of IceCube-260125A
- Fermi-LAT Gamma-ray Observations of IceCube-260115A
- Fermi-LAT Gamma-ray Observations of IceCube-260111A
- Fermi-LAT Gamma-ray Observations of IceCube-251225A
- Fermi-LAT Gamma-ray Observations of IceCube-251218A
- Fermi-LAT Gamma-ray Observations of IceCube-251210A
- Fermi-LAT Gamma-ray Observations of IceCube-251130A
- Fermi-LAT Gamma-ray Observations of IceCube-251025A
- Fermi-LAT gamma-ray observations of IceCube-251018A
- Fermi-LAT Gamma-ray Observations of IceCube-251014A
- Fermi-LAT Gamma-ray Observations of IceCube-250926A
- Fermi-LAT Gamma-ray Observations of IceCube-250905A
- Fermi-LAT Gamma-ray Observations of IceCube-250831A
- Fermi-LAT Gamma-ray Observations of IceCube-250813A
- Fermi-LAT Gamma-ray Observations of IceCube-250804A
- Fermi-LAT Gamma-ray Observations of IceCube-250706A
- Fermi-LAT Gamma-ray Observations of IceCube-250506A
- Fermi-LAT Gamma-ray Observations of IceCube-250429A
- Fermi-LAT Gamma-ray Observations of IceCube-250426A
- Fermi-LAT gamma-ray observations of IceCube-250421A
- Fermi-LAT Gamma-ray Observations of IceCube-250416A
- Fermi-LAT gamma-ray observations of IceCube-250406A
- Fermi-LAT gamma-ray observations of IceCube-250330A
- IceCube-250309A: Upper limits from Fermi-GBM Observations
- Fermi-LAT gamma-ray observations of IceCube-250309A
- Fermi-LAT Gamma-ray Observations of IceCube-250302A
- Fermi-LAT Gamma-ray Observations of IceCube-250207A
- Fermi-LAT Gamma-ray Observations of IceCube-250203A
- Fermi-LAT Gamma-ray Observations of IceCube-250102A
- Fermi-LAT Gamma-ray Observations of IceCube-250101A
- Fermi-LAT Gamma-ray Observations of IceCube-241224A
- Fermi-LAT gamma-ray observations of IceCube-241127A
- Fermi-LAT gamma-ray observations of IceCube-241113A
- Fermi-LAT Gamma-ray Observations of IceCube-241006A
- Fermi-LAT Gamma-ray Observations of IceCube-240929A
- Fermi-LAT gamma-ray observations of IceCube-240808A
- Fermi-LAT gamma-ray observations of IceCube-240725A
- Fermi-LAT gamma-ray observations of IceCube-240721A
- Fermi-LAT gamma-ray observations of IceCube-cascade-240714A
- IceCube-240424A: GRANDMA Optical Upper Limit of Fermi J2151.3+0220
- Fermi-LAT gamma-ray observations of IceCube-240424A
- Fermi-LAT gamma-ray observations of IceCube-240419A
- Fermi-LAT gamma-ray observations of IceCube-240412A
- Fermi-LAT gamma-ray observations of IceCube-240327B
- Fermi-LAT gamma-ray observations of IceCube-240327A
- Fermi-LAT gamma-ray observations of IceCube-240307A
- Fermi-LAT gamma-ray observations of IceCube-240229A
- Gamma-ray flaring activity from the blazar 1ES 1959+650 observed by the Fermi-LAT
- Fermi-LAT gamma-ray observations of IceCube-240204A
- Fermi-LAT gamma-ray observations of IceCube-240123A
- Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region
- Fermi-LAT detection of increased gamma-ray activity of blazar PKS 2047+098, located inside the IceCube-231211A error region
- Fermi-LAT gamma-ray observations of IceCube-231202A
- Fermi-LAT gamma-ray observations of IceCube-231125A
- Fermi-LAT gamma-ray observations of IceCube-231103A
- Fermi-LAT gamma-ray observations of IceCube-231027A
- IceCube-231004A: Upper limits from Fermi-GBM Observations
- Fermi-LAT gamma-ray observations of IceCube-231014A
- Fermi-LAT gamma-ray observations of IceCube-231004A
- Fermi-LAT gamma-ray observations of IceCube-230914A
- Fermi-LAT gamma-ray observations of IceCube-230727A
- Fermi-LAT gamma-ray observations of IceCube-230725A
- Fermi-LAT gamma-ray observations of IceCube-230724A
- Fermi-LAT gamma-ray observations of IceCube-230708A
- Fermi-LAT gamma-ray observations of IceCube-230707B
- Fermi-LAT gamma-ray observations of IceCube-230707A
- Fermi-LAT gamma-ray observations of IceCube-230603A
- Fermi-LAT gamma-ray observations of IceCube-230524A
- Fermi-LAT gamma-ray observations of IceCube-230511A
- Fermi-LAT gamma-ray observations of IceCube-230506A
- Fermi-LAT gamma-ray observations of IceCube-230416A
- Fermi-LAT gamma-ray observations of IceCube-230405A
- Fermi-LAT gamma-ray observations of IceCube-230401A and detection of Fermi J0030.2+0005
- Fermi-LAT gamma-ray observations of IceCube-230306A
- Fermi-LAT gamma-ray observations of IceCube-230220A
- Fermi-LAT gamma-ray observations of IceCube-230217A
- Fermi-LAT gamma-ray observations of IceCube-230201A
- Fermi-LAT gamma-ray observations of IceCube-230122A
- Fermi-LAT gamma-ray observations of IceCube-230112A
- Fermi-LAT Gamma-ray Observations of IceCube-Cascade-230109A
- Fermi-LAT Gamma-ray Observations of IceCube-Cascade-221229A
- Fermi-LAT gamma-ray observations of IceCube-221229A
- Fermi-LAT gamma-ray observations of IceCube-221224A
- Fermi-LAT gamma-ray observations of IceCube-221223A
- Fermi-LAT gamma-ray observations of IceCube-221216A
- Fermi-LAT gamma-ray observations of IceCube-221210A
- Fermi-LAT gamma-ray observations of IceCube-221124A
- Fermi-LAT gamma-ray observations of IceCube-221104A
- Fermi-LAT gamma-ray observations of IceCube-220928A
- Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
- Fermi-LAT Gamma-ray Observations of IceCube-220907A
- Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
- Fermi-LAT Gamma-ray Observations of IceCube-220629A
- Fermi-LAT Gamma-ray Observations of IceCube-220627A
- Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
- Fermi-LAT Gamma-ray Observations of IceCube-220524A