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"43850 results found.
- GRB 160525B: Swift/UVOT Detection
- GRB 160521B: Swift-XRT afterglow detection
- GRB 160525B: Enhanced Swift-XRT position
- Konus-Wind observation of GRB 160521B
- GRB 160525A: Swift-BAT refined analysis
- GRB 160525B: Prompt enhanced Swift-XRT position
- GRB 160525B: Swift detection of a burst
- GRB 160525A: Swift detection of a probable burst
- Correction - Fermi/GBM trigger 160523919 is a GRB
- GRB 160521B: Theoretical estimate of the redshift and urgent need for further x-ray observations
- The nature of the Fermi/GBM trigger 160523919 is unknown.
- GRB 160425A: SMARTS late-time observations
- GRB 160327A: 15 GHz upper limits from AMI
- GRB 160321A: 15 GHz upper limits from AMI
- GRB 160314A: 15 GHz upper limits from AMI
- GRB 160313A: 15 GHz upper limits from AMI
- GRB 160521B: Swift-XRT observations
- Another Swift detection of SGR 1935+2154 (trigger #687124)
- Swift detection of SGR 1935+2154
- GRB 160521B: Swift ToO observations
- GRB 160521B: Fermi-LAT detection
- GRB 160521B: Fermi GBM detection
- GRB 160521A: a long GRB detected by INTEGRAL
- GRB 160519A: Swift-BAT refined analysis
- Swift-BAT trigger 686845 was due to noise near a known source
- GRB 160519A: Fermi GBM detection
- Konus-Wind observation of a bright burst from SGR 1935+2154
- FERMI GBM bursts from the magnetar SGR 1935+2154
- GRB 160519A: Swift detection of a burst
- SGR 1935+2154: AbAO optical upper limit
- Fermi GBM triggers of SGR 1935+2154
- Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
- Fermi GBM trigger 485205628 /160517806 is not a GRB
- Fermi GBM trigger 485124591/160516868 is not a GRB
- Trigger 686443: Swift detection of SGR 1935+2154
- Fermi GBM trigger 484906918/160514349 is not a GRB
- GRB 160509A: Further VLA Observations
- FACT follow-up of the IceCube event 160427A
- Interplanetary Network Search for IceCube 160427A
- GRB 160509A MASTER-NET observations
- GRB 160509A: CALET Gamma-Ray Burst Monitor detection
- GRB 160509A: non-observation of VHE emission with HAWC
- GRB 160508A: CALET Gamma-Ray Burst Monitor detection
- GRB 160509A: TLS Tautenburg Afterglow Detection
- GRB 160509A Gemini North redshift
- Fermi GBM trigger 484574960/160510506 is not a GRB
- Konus-Wind observation of GRB 160509A
- GRB 160509A: DCT Imaging / Afterglow Confirmation
- GRB 160509A: MAXI/GSC refined analysis
- GRB 160509A: VLA Detection
- GRB 160509A: Fermi-LAT refined analysis
- GRB 160509A: Fermi GBM Detection
- GRB 160509A Gemini North candidate afterglow
- GRB 160509A: optical observations
- GRB 160509A: Swift-XRT afterglow detection
- GRB 160509A: Preliminary XRT positon
- GRB 160509A: Tiled Swift observations
- Correction to GCN 19404; GRB 160509A: MAXI/GSC detection
- GRB 160227A: MAXI/GSC detection
- GRB 160509A: Fermi-LAT prompt detection of a very bright burst
- GRB 160506A: TAROT La Silla observatory optical observations
- LIGO/Virgo G211117: Astrosat CZTI upper limits
- GRB 160506A: IRSF upper limits
- GRB 160506A: Swift-XRT refined Analysis
- GRB 160506A: Swift-BAT refined analysis
- GRB 160506A: GROND upper limits
- GRB 160506A: Enhanced Swift-XRT position
- GRB 160506A: Swift detection of a burst
- GRB 160504A: Swift-BAT refined analysis
- IceCube-160427A: iPTF Observations
- GRB 160504A: RATIR Optical and NIR Observations
- GRB160504A: Gemini NIR Observations
- GRB 160504A: Bassano Bresciano Observatory upper limits
- GRB 160504A: Swift-XRT refined Analysis
- GRB 160504A: Enhanced Swift-XRT position
- GRB 160504A: NOT upper limits
- GRB 160417A, the review of the sky area in plate archive
- GRB 160504A: TAROT Calern observatory optical observations
- GRB 160504A: Swift detection of a burst
- ICECUBE-160427A : Pan-STARRS imaging and optical transients in the field
- GRB 160503A: Fermi GBM observation
- GRB 160503A: Fermi-LAT detection
- GRB 160501A: SMARTS optical/IR observations
- VERITAS rapid follow-up observations of IceCube event 160427A
- GRB 160501A: Swift-BAT refined analysis
- GRB 160501A: GROND Upper limits
- GRB 160501A: UKIRT near-IR upper limits
- GRB 160501A: Swift/UVOT Upper Limits
- GRB 160501A: Swift-XRT refined Analysis
- GRB 160501A: RATIR Optical and NIR Observations
- GRB 160501A: Enhanced Swift-XRT position
- GRB 160501A: TAROT Calern observatory optical observations
- GRB 160501A MASTER-NET early observations
- GRB 160501A: NOT optical and NIR observations
- GRB 160501A: Swift detection of a burst
- IceCube-160427A: Fermi GBM Observations
- ICECUBE-160427A neutrino candidate event: updated direction information
- MASTER search for counterpart to the IceCube event 67093193 (run 127853)
- Archival observations by HAWC of IceCube HESE event of April 27, 2016
- Fermi/LAT search for counterpart to the IceCube event 67093193 (run 127853)