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"138 results found.
- AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
- Swift detection of an SGR burst from AXP 4U 0142+61
- AXP 4U 0142+61: Fermi GBM detection
- AXP 4U 0142+61: Swift-BAT refined analysis
- Swift detection of a SGR-like burst from the AXP 4U 0142+61
- GRB 110205A: Swift-BAT refined analysis
- Swift/UVOT observations of GRB110201A
- GRB 110112A: Swift detection of a possible short burst
- GRB 101213A: Swift detection of a burst
- Swift detection of outburst from the SFXT IGR J18410-0535
- Konus-Wind observation of GRB 100119A
- GRB 090621: Fermi GBM observation
- Modification of Swift/UVOT response to bright GRBs
- SGR 0501+4516: Proximity to supernova remnant HB9
- GRB 071112C: Optical and NIR data observed with KANATA
- Swift trigger on 4U 1700-377 while star tracker loss-of-lock
- GRB 070521, Swift-BAT refined analysis
- GRB 070506: Swift detection of a burst with optical afterglow
- Swift/UVOT observations of GRB070429A
- Retractions of previous Swift-BAT triggers
- Swift detection of an outburst from the 4U 1246-58 LMXB burster
- GRB060421: Swift/UVOT observations
- GRB 060413: XRT refined analysis
- GRB 060124: Swift-BAT detection of a burst
- GRB051028: Swift/UVOT upper limits
- GRB 050607: Optical decay and spectral slope
- GRB050319, color indices
- GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
- IBAS GRB Alerts 1978-1980
- GRB040903 - A XRF?
- Color indices of the afterglow of GRB011211
- Updated Astrometry for the IR Counterpart of GRB990705
- GRB 990705, R-band observations
- Updated IPN localization of GRB990705
- IPN localization of GRB990705
- GRB990308 (Trig. 7457), optical observations
- GRB 981226 - Infrared Observations
- SGR 1627-41