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"47 results found.
- GRB 260317A: SVOM/ECLAIRs detection through offline targeted search and its possible association to magnetar 1E 1841-04.5
- Fermi-LAT Gamma-ray Observations of IceCube-260610A
- IceCube-260610A - IceCube observation of a high-energy neutrino candidate track-like event
- Swift detection of the Soft Gamma Repeater PSR J1647-4552
- Fermi-LAT gamma-ray observations of IceCube-240808A
- Fermi trigger No 722462310: Global MASTER-Net observations report
- IceCube-230708A - IceCube observation of a high-energy neutrino candidate track-like event
- IceCube-220221A - IceCube observation of a high-energy neutrino candidate track-like event
- GRB 220117B: Swift/UVOT Upper Limits
- Fermi-LAT Gamma-ray Observations of IceCube-211023A
- IceCube-211023A - IceCube observation of a high-energy neutrino candidate track-like event
- Fermi-LAT Gamma-ray Observations of IceCube-210730A
- Fermi-LAT Gamma-ray Observations of IceCube-201120A
- AX J1846.4-0258: Swift-BAT refined analysis
- Swift Detection of an SGR-like flare from AX J1846.4-0258
- Fermi-LAT ANTARES 200127.79 coincidence: MASTER alert observation and presence of young pulsar close to error-box
- LIGO/Virgo S191110af: Potential pulsar counterparts
- Fermi-LAT Gamma-ray Observations of IceCube-191001A
- Trigger 896552: Swift detection of PSR B1055-52
- Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
- Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
- Fermi-LAT Gamma-ray Observations of IceCube-171106A
- Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
- Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
- Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
- Swift Trigger on AXP CXOU J164710.2-455216
- GBM observation of SGR-like burst from the direction of PSR 1119-6127
- Trigger 706396: Swift detection of a short burst from PSR 1119-6127
- Trigger 648422: Swift possible detection of a source in NGC4552
- IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
- GRB130807A: Swift/UVOT observations
- GRB 120311A: Swift/UVOT Upper Limits
- GRB 120226A: Fermi-GBM and Fermi-LAT detections; LAT position retraction
- Swift detection of short bursts from PSR J1647-4552
- SGR J1834.9-0846: A Neutron Star in W41?
- Swift J1822.3-1606
- SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
- GRB 101008: Swift/UVOT Upper Limits
- An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
- GRB 060121: Confirmation of NIR Afterglow
- GRB 060121: Probable Detection of NIR Afterglow
- GRB 060121: candidate optical counterpart
- GRB060121: SARA Observations
- GRB 060121: optical observations
- GRB 060121: optical observations
- GRB050701: Swift-BAT Refined analysis
- Swift trigger 143708 is really GRB 050701