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"19663 results found.
- GRB 201015A: Swift/UVOT Detection
- GRB 201015A: Swift-XRT refined Analysis
- MAGIC observations of GRB 201015A: hint of very high energy gamma-ray signal
- GRB 201015A: Swift-BAT refined analysis (a soft short pulse with a tail emission)
- GRB 201014A: Nanshan/NEXT optical observations
- GRB 201014A: Lowell Discovery Telescope afterglow imaging
- Konus-Wind observation of GRB 201013A
- GRB 201008A: Swift-XRT afterglow detection
- GRB 201015A: Enhanced Swift-XRT position
- GRB 201015A: BOOTES-1 early optical afterglow detection
- GRB 201014A: Swift/UVOT Upper Limits
- GRB 201015A: GOTO confirmation of afterglow detection
- GRB 201014A: Swift-XRT refined Analysis
- GRB 201015A: Swift-XRT observations
- Swift GRB 201015A: Global MASTER-Net observations report
- Swift GRB201015.95: Global MASTER-Net OT detection
- GRB 201015A: Swift detection of a burst
- GRB 201014A: BOOTES-1 and -2 early optical upper limits
- GRB 201014A: Swift-BAT refined analysis
- GRB 201014A (Swift trigger =1000255): CrAO/ZTSH optical afterglow discovery
- Swift-BAT trigger 1000255: XRT afterglow detection of GRB 201014A
- GRB 201013A: Insight-HXMT/HE detection
- Swift Trigger 1000255 is probably not a GRB
- GRB 201013A: TSHAO and AbAO optical observations, afterglow confirmation
- GRB 201013A: AstroSat CZTI detection
- GRB 201013A: CALET Gamma-Ray Burst Monitor detection
- GRB 201013A: Swift-BAT refined analysis
- GRB 201013A: Swift/UVOT Upper Limits
- Swift GRB 201013A: Global MASTER-Net observations report
- GRB 201013A: Swift-XRT refined Analysis
- SGR 1830-0645: Swift/UVOT Upper Limits
- GRB 201013A: Enhanced Swift-XRT position
- GRB 201013A: Swift detection of a burst
- SGR 1830-0645: pre-discovery detection in Swift/BAT
- SGR 1830-0645 / GRB 201010A: 1.5m OSN optical upper limit
- SGR 1830-0645: Swift-BAT refined analysis
- GRB 201006A: Chandra upper limit on the X-ray afterglow
- SGR 1830-0645 / GRB 201010A: Kitab optical non-detection
- GRB 201010A: Enhanced Swift-XRT position
- Swift GRB201010.62: Global MASTER-Net observations report
- Swift detection of a new SGR 1830-0645 or a short GRB 201010A
- GRB 201008A: Swift-XRT observations
- GRB 201008A: Swift ToO observations
- GRB 201008A: Swift/BAT-GUANO detection and possible arcminute localization
- Swift-XRT observations of IceCube 201007A
- GRB 201006A: GROWTH-India Telescope optical upper limit
- GRB 201006A: Lowell Discovery Telescope upper limits
- GRB 201006A: MITSuME Akeno optical upper limits
- GRB 201006A: Swift-XRT refined Analysis
- GRB 201006A: Swift-BAT refined analysis
- GRB 201006A: Swift/UVOT Upper Limits
- GRB 201006A: Fermi GBM detection
- GRB 201006A is likely a short burst
- GRB 201006A: Enhanced Swift-XRT position
- INTEGRAL sub-threshold detection of GRB 201006A
- GRB 201006A: Swift detection of a burst
- Swift GRB201006.05: Global MASTER-Net observations report
- GRB 201001A: Swift/UVOT Upper Limits
- GRB 201001A: TSHAO optical upper limit
- GRB 201001A: MITSuME Akeno optical upper limits
- GRB 201001A: Swift-BAT refined analysis
- GRB 201001A: Swift-XRT refined Analysis
- GRB 201001A: Fermi GBM observation
- Swift-XRT observations of IceCube 200929A
- GRB 201001A: Enhanced Swift-XRT position
- GRB 201001A: Swift detection of a burst
- Swift-XRT observations of IceCube 200926A
- GRB 200925B: Swift-XRT refined analysis update
- GRB 200925B: Swift-XRT refined Analysis
- GRB 200925B: Swift/UVOT Detection
- GRB 200925B: Swift-BAT refined analysis
- GRB 200925B: Enhanced Swift-XRT position
- Swift GRB 200925B: Global MASTER-Net OT detection
- GRB 200925B: OSN Afterglow Candidate Discovery
- GRB 200925B: Prompt enhanced Swift-XRT position
- GRB 200925B: Swift detection of a burst
- Swift GRB200925.91: Global MASTER-Net observations report
- GRB 200922A: chance superposition between optical afterglow and archival star
- GRB 200922A: Insight-HXMT/HE detection
- GRB 200922A: Swift-BAT refined analysis
- Improved enhanced Swift-XRT position of GRB 200922A
- GRB 200922A: Swift/UVOT Detection
- Swift GRB 200922A: Global MASTER-Net observations report
- GRB 200922A: Swift-XRT refined Analysis
- GRB 200917A: Swift/UVOT Upper Limits
- GRB 200922A: Enhanced Swift-XRT position
- GRB 200922A: Swift detection of a burst with possible optical counterpart
- GRB 200914A: Swift-XRT further observations
- GRB 200919A: Swift-BAT refined analysis
- Swift GRB200919.08: Global MASTER-Net observations report
- GRB 200919A: Swift detection of a burst
- GRB 200917A: GROWTH-India Telescope optical upper limit.
- Swift-XRT observations of IceCube 200916A
- GRB 200917A: Swift-BAT refined analysis
- Fermi-GBM Sub-Threshold Detection of GRB 200917A
- GRB 200917A: Swift-XRT refined Analysis
- Swift GRB 200917A: Global MASTER-Net observations report
- IPN triangulation of GRB 200916B (short)
- GRB 200917A: Enhanced Swift-XRT position
- GRB 200917A: Swift detection of a burst