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"27549 results found.
- Swift trigger 324362 (LS I +61 303 ?): XRT
- GRB 080905B: Photometric Redshift for the 2MASS Galaxy
- Swift trigger 324362 (LS I +61 303 ?)
- GRB080905A: Swift/UVOT Upper Limits
- GRB 080905B: Watcher optical detection
- GRB 080904: Fermi Gamma-ray Burst Monitor detection
- GRB 080905B: Fermi Gamma-ray Burst Monitor detection
- GRB 080905A: Fermi Gamma-ray Burst Monitor detection
- GRB 080905A: Enhanced Swift-XRT position
- GRB 080905A: MITSuME Akeno optical upper limits
- Swift Trigger 324116 is known source again
- Swift Trigger 324112 is known source Swift J1842.5-1124
- GRB 080906: Refined Swift/UVOT Observations
- GRB 080906: Swift-XRT Refined Analysis
- GRB 080905A: optical afterglow
- GRB 080906: GROND observations of the optical/NIR afterglow
- GRB 080905B: Swift-XRT Refined Analysis
- GRB 080905B: Refined UVOT Analysis
- GRB 080905B: VLT redshift
- GRB 080905A: NOT and VLT observations
- GRB 080905B: Enhanced Swift-XRT position
- GRB 080906: Swift detection of a burst with optical afterglow
- GRB 080905A: Swift-XRT Refined Analysis
- GRB080825C: Fermi-LAT observations
- GRB 080905B: Swift detection of a burst with possible optical counterpart
- GRB 080905: R & I-band optical observations
- GRB 080905: Swift detection of a probably-short burst
- GRB 080903: Swift/UVOT Observations
- GRB 080903: Swift-XRT Refined Analysis
- GRB 080903: Enhanced Swift-XRT position
- GRB 080903: optical observations
- GRB 080903: Liverpool Telescope observations
- GRB 080903: Astrotel-Caucasus optical observations
- GRB 080903: Optical afterglow candidate
- GRB 080903: TAROT Calern observatory optical observations
- GRB 080903: ROTSE-III Optical Limits
- GRB 080903: Swift detection of a burst
- Recent VLA non-detection of SGR 0501+4516
- GRB 080830: Fermi Gamma-ray Burst Monitor detection
- SGR 0501+4516: preliminary results of the first XMM-Newton observation
- GRB080828: Swift/UVOT Upper Limits
- SGR 0501+4516: Detection of possible optical counterpart
- SGR 0501+4516: WHT observations of the possible near-infrared counterpart
- GRB080825B: Swift/UVOT Upper Limits
- GRB 080828: Swift-XRT detection of a possible X-ray afterglow
- Swift-BAT trigger 322590 is not a GRB
- VLA non-detection of SGR 0501+4516
- Radio Detection of SGR 0501+4516: Retraction
- Swift trigger 322590: BAT detection of a possible burst
- SGR 0501+4516: Decline in Activity
- SGR 0501+4516: Proximity to supernova remnant HB9
- Enhanced Swift-XRT position of SGR 0501+4516
- SGR 0501+4516: Swift XRT measure of the spin period
- GRB080823: Fermi Gamma-ray Burst Monitor detection
- GRB 080824: Fermi Gamma Ray Burst Monitor detection
- GRB080825C: GLAST Burst Monitor detection
- GRB 080825B: Swift-XRT team analysis
- Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
- GRB080825: Afterglow confirmation and redshift estimate
- Radio Detection of SGR 0501+4516
- SGR 0501+4516: MDM Optical Observations
- GRB 080822B, Swift-BAT refined analysis
- SGR 0501+4516: Astrotel-Caucasus optical observations
- SGR 0501+4516: UKIRT detection of possible infra-red counterpart
- SGR 0501+4516: WSRT Radio Observations
- New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
- SGR 0501+4516: optical observations
- Swift Trigger 321481: A Large Flare from SGR 0501+4516
- Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
- GRB 080822B: Swift detection of a burst
- GRB080818B: GLAST Burst Monitor detection
- GRB 080822 (SGR 0501+4516): archival optical observations
- GRB 080822: Swift detection of a short burst
- GLAST Burst Monitor detection of a GRB: 080816B
- GLAST Burst Monitor detection of GRB 080818
- GLAST Burst Monitor detection of GRB080817B
- GLAST Burst Monitor detection of GRB 080817
- GLAST Burst Monitor detection of GRB080816
- GRB080810 - optical observations
- GRB080810: optical observations
- GLAST Burst Monitor detection of GRB 080812
- Radio detection of GRB 080810 with the VLA
- GRB 080810: RTT150 optical observations
- GLAST Burst Monitor detection of GRB 080810
- GRB 080810: Liverpool and Faulkes North observations
- GRB 080810: RTT150 optical observations
- GRB080810: MITSuME optical observation
- GRB 080810: Swift/UVOT Refined Analysis
- GRB 080810: optical observations
- GRB 080810: Liverpool Telescope observations
- GRB 080810: D50 optical observation
- GRB 080810: Observations from NOT
- GRB 080810: RTT150 optical observations
- GRB 080810: Swift-XRT Team refined analysis
- GRB 080810: Enhanced Swift-XRT position
- GRB 080810: KANATA optical-NIR observation, update
- GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
- GRB 080810: Keck/HIRES Spectroscopy
- GRB 080810 : optical observation with KANATA
- GRB 080810: Swift detection of a burst with a bright optical afterglow