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"11102 results found.
- Fermi GBM trigger 160810523/492525192 is not a GRB
- GRB 160806A: Fermi GBM observation
- IPN Triangulation of GRB 160806A
- GRB160802A - Astrosat CZTI detection
- GRB 160804A: Fermi GBM observation
- Konus-Wind observation of GRB 160802A
- IPN Triangulation of GRB 160802A
- GBM Observations of IceCube 160731
- GRB 160802A: Fermi GBM detection
- GRB160720A: Astrosat CZTI detection
- GRB160709A: Astrosat CZTI detection of short GRB
- GBM observation of SGR-like burst from the direction of PSR 1119-6127
- Konus-Wind observation of short GRB 160726A
- GRB 160726A: Fermi GBM observation
- GRB 160721A: CALET Gamma-Ray Burst Monitor detection
- Konus-Wind observation of GRB 160720A
- IPN Triangulation of GRB 160720A
- GRB 160720A: Fermi GBM detection
- Fermi GBM trigger 490701713/160720418 is not a GRB
- Fermi GBM trigger 490365157/160716523 is not a GRB
- GRB 160623A: afterglow spectroscopy by GTC and independent redshift determination
- GRB 160714A: Fermi GBM observation
- Fermi GBM trigger 490193747/160714539 is not a GRB
- GRB 160709A: MASTER early imaging Swift BAT error box
- GRB 160709A, Swift-BAT detection and localization
- GRB 160709A: Swift-XRT observations
- GRB 160709A: Global MASTER Net Fermi GBM Alerts observations
- Konus-Wind observation of GRB 160709A (short/hard)
- GRB 160709A: Fermi GBM Observations
- GRB 160709A: Fermi-LAT detection
- GRB 160709A: Tiled Swift observations
- Fermi GBM trigger 489771293/160709649 is not a GRB
- GRB 160628A CALET Gamma-Ray Burst Monitor detection
- SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
- GRB 160623A: Astrosat CZTI detection
- GRB 160625B: RTT150 optical observations
- GRB 160625B: LCOGT FTN observations
- GRB 160629A: Global MASTER Net Prompt OT observations
- Konus-Wind observation of GRB 160629A
- GRB 160629A: Fermi GBM observation
- Pi of the Sky detection of an optical flash accompanying GRB 160625B
- Konus-Wind observation of a bright burst from SGR 1935+2154
- GRB 160625B: Global MASTER-Net prompt optical emission detection
- GRB 160625B: 15 GHz detection from AMI
- GRB 160623A: Possible detection of a radio afterglow at 15 GHz with AMI
- SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
- GRB 160625B: VLA Detection
- GRB 160625B: TSHAO optical observations
- Konus-Wind observation of GRB 160625B
- GRB 160625B: Mini-MegaTORTORA detection of bright optical flash simultaneous with LAT event
- GRB 160625B: RATIR Optical and NIR Observations
- GRB 160625B: VLT/X-shooter redshift
- Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
- GRB 160625B: RATIR Optical and NIR Afterglow Detection
- GRB 160625B: Fermi GBM refined analysis
- GRB 160625B: Fermi-LAT refined analysis
- GRB 160625B: Swift-XRT afterglow detection
- GRB 160623A: SMA submm afterglow observations
- GRB 160625B: Tiled Swift observations
- GRB 160625B: Fermi GBM initial observations
- GRB 160625B: Fermi-LAT detection of a bright burst
- GRB 160625A - two different events?
- GRB 160624A: Fermi GBM observation
- GRB 160521B: 15 GHz upper limits from AMI
- GRB 160623A: Mondy optical observations
- Swift detection of a dust-scattered halo around GRB 160623A
- GRB 160623A: Swift-XRT afterglow detection
- GRB 160623A: Fermi GBM detection/observation
- Konus-Wind observation of GRB 160623A
- GRB 160623A / Galactic transient: Fermi-LAT detection
- GRB 160623A: Swift ToO observations
- Fermi GBM Trigger 160622573 is not a GRB
- More FERMI GBM bursts from the magnetar SGR 1935+2154
- Fermi GBM trigger 488128598/160620637 is not a GRB
- Fermi GBM trigger 487974449/160618852 is not a GRB
- Konus-Wind observation of GRB 160612A
- IPN Triangulation of GRB 160612A (short/hard)
- GRB 160509A: 15 GHz upper limits from AMI
- GRB 160612A: Fermi GBM detection
- Fermi GBM trigger 486907024/160606498 is not a GRB
- Fermi GBM trigger 486562774/160602514 is not a GRB
- GRB 160530B CALET Gamma-Ray Burst Monitor detection
- GRB 160530B: Fermi GBM Detection
- GRB 160521B: Swift-XRT afterglow detection
- Konus-Wind observation of GRB 160521B
- 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 160521B: Swift-XRT observations
- GRB 160521B: Swift ToO observations
- GRB 160521B: Fermi-LAT detection
- GRB 160521B: Fermi GBM detection
- 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
- SGR 1935+2154: AbAO optical upper limit
- Fermi GBM triggers of SGR 1935+2154
- Fermi GBM trigger 485205628 /160517806 is not a GRB
- Fermi GBM trigger 485124591/160516868 is not a GRB
- Fermi GBM trigger 484906918/160514349 is not a GRB