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 200612A: Swift-XRT refined Analysis
- Konus-Wind observation of ultra-long GRB 200612A
- GRB 200612A: Enhanced Swift-XRT position
- GRB 200612A: BOOTES-3/YA optical upper limit
- Swift GRB200612.19: Global MASTER-Net OT detection
- Swift GRB200612.19: Global MASTER-Net observations report
- GRB 200612A: Swift detection of a burst
- GRB 200608A: Swift-BAT refined analysis
- Swift GRB 200608A: Global MASTER-Net observations report
- GRB 200608A: BOOTES-3 and BOOTES-4 optical upper limit
- GRB 200608A: Swift detection of a burst
- IPN triangulation of GRB 200605A (short)
- Correction to the GCN 27886: Previous bursts of 1RXS J1708-4009 (Swift trigger 975998)
- 1RXS J1708−4009: Swift-BAT refined analysis
- Swift detection of an SGR-like burst from 1RXS J1708−4009
- GRB 200529A: Swift/UVOT Upper Limits
- Konus-Wind observation of GRB200528A
- GRB 200529A: Swift-BAT refined analysis
- GRB 200529A: Swift-XRT refined Analysis
- GRB 200528A: CAHA Upper Limit
- GRB 200529A: Fermi GBM Detection
- GRB 200529A: LCO Optical Afterglow Detection
- GRB 200528A: CALET Gamma-Ray Burst Monitor detection
- GRB 200529A: BOOTES-2/TELMA early optical upper limit
- GRB 200528A: Swift-XRT refined Analysis
- GRB 200528A: Assy optical upper limit
- GRB 200529A: Enhanced Swift-XRT position
- GRB 200529A: KAIT Optical Afterglow Confirmation
- GRB 200529A: Swift detection of a burst
- Swift GRB200529.04: Global MASTER-Net observations report
- GRB 200528A: Fermi GBM Observation
- GRB 200528A: Swift/UVOT Upper Limits
- GRB 200528A: Swift-BAT refined analysis
- GRB 200528A: 1.3m DFOT Optical Upper Limits
- GRB 200528A: Enhanced Swift-XRT position
- Swift GRB 200528A: Global MASTER-Net observations report
- GRB 200528A: MITSuME Akeno optical upper limits
- GRB 200528A: Swift detection of a burst
- GRB200524A: UVOT detection
- GRB 200524A: optical upper limits from further MITSuME Akeno observation
- GRB 200522A: Gemini North optical imaging
- GRB 200524A: AstroSat CZTI detection
- GRB 200524A: MITSuME Akeno optical observation
- GRB 200524A: Swift-XRT afterglow detection
- GRB 200524A: Fermi GBM detection
- GRB 200524: Swift/UVOT observations missed the ZTF20abbiixp position
- GRB 200524A: Swift ToO observations
- GRB 200524A: Fermi-LAT detection
- GRB 200522A: Swift-BAT refined analysis
- GRB 200522A: LCO Optical Afterglow Detection
- Swift GRB 200522A: Global MASTER-Net observations report
- GRB 200522A: Swift-XRT refined Analysis
- GRB 200522A: BOOTES-3/YA optical upper limit
- GRB 200522A: Swift/UVOT Upper Limits
- GRB 200522A: Enhanced Swift-XRT position
- GRB 200522A: Coincident catalogued galaxy at z~0.4
- GRB 200522A: Swift detection of a short burst
- GRB 200517A: Swift-XRT Confirmation of afterglow
- GRB 200519A: CALET Gamma-Ray Burst Monitor detection
- GRB 200519A: Swift-BAT refined analysis
- GRB 200519A: Insight-HXMT/HE detection
- GRB 200519A: Swift/UVOT Detection
- GRB 200519A: AstroSat CZTI detection
- Swift GRB 200519A: Global MASTER-Net observations report
- GRB 200519A: 1.3m DFOT Optical Afterglow Detection
- GRB 200519A: Swift-XRT refined Analysis
- GRB 200519A: Enhanced Swift-XRT position
- GRB 200519A: BOOTES-3/YA optical counterpart observations
- GRB 200519A: LCO Optical Afterglow Detection
- GRB 200519A: Swift detection of a burst with an optical afterglow
- GRB 200517A: Swift-XRT afterglow detection
- GRB 200517A: Tiled Swift observations
- Swift J1818.0-1607: BOOTES-3/YA optical upper limit
- Swift GRB200516.63: Global MASTER-Net observations report
- Swift Detection of a burst from SGR Swift J1818.0-1607
- GRB 200512A: Swift-BAT refined analysis
- GRB 200514A: MAXI/GSC detection
- GRB 200512A: LCO Optical Upper Limits
- Fermi GBM Sub-Threshold Detection of GRB 200512A
- GRB 200512A: Swift/UVOT Upper Limits
- GRB 200512A: Swift-XRT refined Analysis
- GRB 200512A: Enhanced Swift-XRT position
- GRB 200512A: Swift detection of a burst
- IPN triangulation of a bright burst from SGR 1935+2154 on 2020-05-10 at 06:12 UT
- GRB 200509A: Swift-BAT refined analysis
- GRB 200509A: Swift/UVOT Detection
- Swift GRB 200509A: Global MASTER-Net observations report
- GRB 200509A: LCO Optical Afterglow Detection
- GRB 200509A: Swift-XRT refined Analysis
- GRB 200509A: Enhanced Swift-XRT position
- GRB 200509A: Zadko observatory - Gingin optical upper limits
- GRB 200509A: Swift detection of a burst with a possible optical counterpart
- Swift Detection of a burst from SGR Swift J1818.0-1607
- Swift GRB200506.73: Global MASTER-Net observations report
- GRB 200424A: Swift-XRT afterglow detection
- Fermi GBM observation of a flare from the magnetar SGR 1806-20
- Trigger 968731: Swift detection of SGR1806-20
- SGR 1935+2154: MASTER optical observations
- Konus-Wind observation of a very intense bursting activity of SGR 1935+2154
- A Forest of Bursts from SGR 1935+2154