GCN Circulars
GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"28225 results found.
- INTEGRAL Weak trigger #6331: GRT Optical Observation
- GRB 110721A: Swift observations of afterglow candidate
- GRB 110726A: optical upper limit in CrAO
- Swift detection of a SGR-like burst from the AXP 4U 0142+61
- GRB 110726A: IAC80 R-band observations
- GRB 110726A: ROTSE-III refined analysis, fast decay in early phase
- GRB110726A: MITSuME Ishigakijima Optical Observation
- GRB 110726A: Further Swift/UVOT Observations
- GRB 110726A: Enhanced Swift-XRT position
- GRB 110726A: Swift/UVOT Detection
- GRB 110726A: Liverpool Telescope observations
- GRB 110726: ROTSE-III Detection of Optical Counterpart
- GRB 110726A: Swift detection of a burst
- GRB 110721A: potential counterpart candidate
- Konus-Wind observation of GRB 110721A
- GRB 110709B / EVLA detection of radio counterpart
- GRB 110719A / SMA 345 GHz upper limits
- GRB 110721A: Fermi-LAT detection
- GRB 110721A: Fermi GBM detection
- GRB 110719A: GRT Optical Observation
- GRB 110719A: optical limit by "Pi of the Sky"
- GRB 110719A: z-band upper limit
- Swift/UVOT observations of GRB110719A
- GRB 110719A: Swift-XRT refined Analysis
- GRB 110719A: optical upper limit
- GRB 110719A: Enhanced Swift-XRT position
- GRB 110715A optical observations
- GRB 110719A: Swift detection of a burst
- GRB 110715A: ATCA detection of the radio counterpart
- Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
- GRB110715A: GROND Detection of the Optical/NIR Afterglow
- GRB 110715A: APEX detection of the submm counterpart
- GRB 110715A: Swift-XRT refined Analysis
- GRB110715A: VLT redshift
- Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
- GRB 110715A: Swift/UVOT Detection
- GRB 110715A: Enhanced Swift-XRT position
- Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
- GRB 110715A: Swift detection of a bright burst with an optical counterpart
- GRB 110709B: Swift/UVOT Observations
- GRB 110709A / EVLA upper limits
- GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
- Swift trigger 457076 is not a GRB
- GRB 110709B: Submm observations from APEX
- Swift Trigger 457076: a possible GRB
- GRB 110709A: Swift/UVOT Upper Limits
- GRB 110709A: Konkoly observations
- GRB 110708A: Konkoly observations
- GRB 110709B BAT refined analysis
- GRB 110709B: burst detection from Swift-BAT slew data
- GRB 110709B: Swift-XRT refined Analysis
- GRB 110709A: Swift-XRT refined Analysis
- GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
- GRB110709A: MITSuME Ishigakijima Optical upper limits
- GRB 110709B: Enhanced Swift-XRT position
- GRB110709A: upper limits from CAHA 1.23m and OSN 1.5m
- GRB 110709A: Fermi GBM observation
- GRB 110709B: GROND Detection of an Afterglow Candidate
- GRB 110709B: Gemini-South optical observations
- GRB 110709B: possible quiescent source in DSS
- GRB 110709B: Swift detection of renewed activity at T+11 minutes.
- GRB 110709A: Enhanced Swift-XRT position
- GRB 110709B: Swift detection of a burst
- GRB 110708A: Swift/UVOT Observations
- GRB 110709A: Prompt enhanced Swift-XRT position
- GRB 110709A: Swift detection of a burst
- GRB 110708A: Liverpool Telescope observations
- GRB 110708A: Lick observations
- GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst
- Swift trigger 456780 is not a burst
- GRB 110705A: Fermi GBM detection
- Swift Trigger 456659 is probably not astrophysical
- Swift-BAT trigger 456532 is not astrophysical
- SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
- GRB 110625A: Suzaku WAM observation of the prompt emission
- GRB 110625A: Fermi GBM and LAT observations
- GRB 110625A: Swift/UVOT Upper Limits
- GRB 110625A: 1.23m CAHA I-band observations
- GRB 110625A: Fermi LAT detection
- GRB 110625A: GROND detection of a source inside the XRT error circle
- GRB 110625A: NIR Source
- GRB 110625A: Konkoly observations
- GRB 110625A: Swift-XRT refined Analysis
- Swift J185003.2-005627: NIR Observation
- GRB 110625A: ROTSE-III Optical Limits
- GRB 110625A: Swift detection of a burst
- Swift J185003.2-005627: Swift-XRT/UVOT refined analysis
- Swift J185003.2-005627: TAROT Calern observatory optical observations
- Swift J185003.2-005627: Swift detection of a burst from a new Galactic transient
- GRB 110618A: SMARTS optical observations
- GRB 110604A: final update on Swift-XRT observations
- SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
- GRB 110610A: Fermi GBM detection
- GRB 110610A: 1.23m CAHA optical observations
- GRB 110610A: Swift-XRT refined Analysis
- GRB 110610A: Swift/UVOT Upper Limits
- GRB 110610A: Enhanced Swift-XRT position
- Swift detection of the X-ray afterglow of GRB 110604A
- GRB 110610A: Swift detection of a burst
- GRB 110604A Detection by IPN Spacecraft and Swift-BAT