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"- GRB 190610A: Further Swift-XRT observations
- GRB 190628A: Fermi GBM Final Real-time Localization
- GRB 190627A: GMG observation
- GRB 190627A: MASTER optical counterpart observation
- GRB190627A: VIRT Afterglow observation
- GRB 190627A: Montarrenti Observatory optical detection
- GRB 190627A: NUTTelA-TAO optical observations
- Fermi trigger No 583327924 Global MASTER-Net observations report
- GRB 190627A: Enhanced Swift-XRT position
- GRB 190627A: Swift/UVOT Detection
- GRB 190627A: Swift detection of a burst
- Fermi trigger No 583245413 Global MASTER-Net observations report
- Fermi trigger No 583245413 Global MASTER-Net observations report
- Fermi trigger No 583221986 Global MASTER-Net observations report
- GRB 190626B: Fermi GBM Final Real-time Localization
- GRB 190619B: AstroSat CZTI detection
- GRB 190626A: Fermi GBM Final Real-time Localization
- Fermi trigger No 583111521 Global MASTER-Net observations report
- Swift Trigger 911102 is likely not an astrophysical event
- IceCube-190619A: prompt emission upper limits from AstroSat-CZTI
- Swift GRB190624.86 Global MASTER-Net observations report
- Swift trigger 911102: D50 optical limit
- Swift Trigger 911102: a possible GRB
- GRB 190623A: Fermi GBM Final Real-time Localization
- Fermi trigger No 582886211 Global MASTER-Net observations report
- GRB 190622A: BALROG localization (Fermi Trigger 582886211 / GRB 190622368)
- GRB 190622A: Fermi GBM Final Real-time Localization
- Fermi trigger No 582856902 Global MASTER-Net observations report
- GRB 190615B: AstroSat CZTI detection
- Fermi trigger No 582748289 Global MASTER-Net observations report
- Fermi trigger No 582759998 Global MASTER-Net observations report
- Fermi-LAT Gamma-ray Observations of IceCube-190619A
- IceCube-190619A: No counterpart candidates in ANTARES data
- IceCube-190619A: IceCube additional correlated neutrino search: upper limits
- IceCube-190619A - HAWC follow-up
- LIGO/Virgo S190426c: Swift UVOT - no new counterpart candidates identified
- LIGO/Virgo S190510g: Swift UVOT - no new counterpart candidates identified
- GRB 190620A: BALROG localization (Fermi Trigger 582725415 / GRB 190620507)
- GRB 190620A: Fermi GBM Final Real-time Localization
- Fermi trigger No 582615488 Global MASTER-Net observations report
- IceCube-190619A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- Fermi trigger No 582615488 Global MASTER-Net observations report
- IceCube-190619A: not observable by Fermi-GBM
- Fermi GBM trigger 190619235/582615488 likely not a GRB
- IceCube-190619A - IceCube observation of a high-energy neutrino candidate event
- Fermi trigger No 582646590 Global MASTER-Net observations report
- GRB 190619B: BALROG localization (Fermi Trigger 582646590 / GRB 190619595)
- GRB 190619B: Fermi GBM Final Real-time Localization
- GRB 190613A: SEDM Observations
- Fermi trigger No 582596766 Global MASTER-Net observations report
- GRB 190613B: JCMT SCUBA-2 sub-mm observations
- GRB 190619A: Fermi GBM Final Real-time Localization
- GRB 190613B: AstroSat CZTI detection
- GRB 190611B: AstroSat CZTI detection
- Konus-Wind observation of GRB 190613B
- GRB 190615B: Insight-HXMT/HE detection
- GRB 190615A: Insight-HXMT/HE detection
- GRB 190613B: Kitab observatory optical upper limit
- Fermi trigger No 582304592 Global MASTER-Net observations report
- GRB 190615A: Fermi GBM Final Real-time Localization
- GRB 190613A: Kitab and AbAO optical upper limit
- Fermi trigger No 582159815 Global MASTER-Net observations report
- GRB 190613B: SEDM Observations
- GRB 190613A: SEDM Observations
- GRB 190610A: Swift/UVOT Upper Limits
- GRB 190610A: Swift-XRT observations
- GRB 190613B: Optical observation from Asiago Schmidt
- GRB 190613B: GROND Detection of the Optical/NIR Afterglow
- GRB 190611B: CALET Gamma-Ray Burst Monitor detection
- GRB 190613B: Insight-HXMT/HE detection
- Konus-Wind observation of short/hard GRB 190610A
- Konus-Wind observation of GRB 190611B
- GRB 190613B: BOOTES-5/JGT early optical observations
- GRB 190613B: Optical observations from NOT
- Fermi trigger No 582115625 Global MASTER-Net observations report
- GRB 190613B: Swift-XRT refined Analysis
- GRB 190613A: FRAM-ORM afterglow detection
- GRB 190610A: Swift ToO observations
- GRB 190613B: Swift-BAT refined analysis
- GRB 190613A, Swift-BAT refined analysis
- GRB 190613B: KAIT Optical Afterglow Confirmation
- GRB 190613B: Swift/UVOT Detection
- GRB 190613A: Fermi GBM detection
- GRB 190613A: Swift/UVOT Detection
- GRB 190613B: Fermi GBM observation
- GRB 190611B: BALROG localization (Fermi Trigger 581986074 / GRB 190611950)
- GRB 190613B: Enhanced Swift-XRT position
- IPN Triangulation of GRB 190611B
- GRB 190613A: Swift-XRT refined Analysis
- GRB 190613A: Enhanced Swift-XRT position
- GRB 190613B: BALROG localization (Fermi Trigger 582115625 / GRB 190613449)
- GRB 190613B: Swift detection of a burst with an optical counterpart
- GRB 190613B: Fermi GBM Final Real-time Localization
- GRB 190610A: CALET Gamma-Ray Burst Monitor detection
- GRB 190609A: AstroSat CZTI detection
- GRB 190613A: MASTER OT detection
- Swift GRB190613.17 Global MASTER-Net observations report
- GRB 190613A: KAIT Optical Afterglow Confirmation
- GRB 190613A: BALROG localization (Fermi Trigger 582091643 / GRB 190613172)
- GRB 190613A: Fermi GBM Final Real-time Localization