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"12272 results found.
- GRB 120624B: optical observations
- GRB 120624B: Fermi GBM fluence and peak photon flux correction
- Konus-Wind observation of GRB 120624B
- GRB 120624B: Swift detection of a burst
- GRB 120624A: Fermi GBM observation
- GRB 120624B: Fermi-LAT Detection
- GRB 120624B: Fermi GBM detection
- IPN Triangulation of GRB 120624A (short/intense)
- GBM triggers 120604.526 & 120604.399 were not GRBs
- IPN Triangulation of short GRB 120603A
- Fermi GBM trigger 120602.539 is not a GRB
- Fermi Gamma-ray Burst Monitor trigger 120527.573 is not a GRB
- GRB 120521B: Fermi GBM observation
- IPN Triangulation of GRB 120519A (short/hard)
- GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
- Fermi GBM Trigger 358364818 is not a GRB
- Fermi Trigger 358364818: BOOTES-4 observations
- GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
- Fermi/GBM detection of a burst from the magnetar 1E 2259+5
- IPN Triangulation of GRB 120427A
- IPN Triangulation of bright GRB 120426A
- GRB 120402B: MASTER early OT limit
- GRB 120403B: Fermi GBM Observation
- GRB 120402B: Fermi GBM detection
- GRB 120328B: Fermi-LAT Observations
- GRB 120328B: Fermi GBM detection
- IPN Triangulation of GRB 120328B (long/intense)
- GRB 120326A: Fermi GBM Observation
- GRB 120323A: Fermi LAT observations
- Konus-Wind observation of GRB 120323A
- IPN Triangulation of GRB 120323A (short/very intense)
- GRB 120323A: Fermi GBM detection
- GRB 120316A : Suzaku WAM observation of the prompt emission
- GRB 120316A: Fermi-GBM and Fermi-LAT Observations
- Fermi GBM trigger 120319.237 is not a GRB
- Konus-Wind observation of GRB 120316A
- IPN Triangulation of GRB 120316A
- GBM trigger 353549464 (GRB 120316A?) : High-energy photon emission in Fermi/LAT data
- Fermi GBM triggers 120309.265 and 120309.402 are not GRBs
- Fermi GBM triggers 120305.186, 120305.802 and 120306.823 are not GRBs
- GRB 120302A: Fermi GBM Observation
- GRB 120302A found in ground analysis of BAT data
- Konus-Wind observation of GRB 120226A
- GRB 120226A: Fermi-GBM and Fermi-LAT detections; LAT position retraction
- GRB 120226A: Fermi-LAT data analysis
- IPN Triangulation of GRB 120226A
- GRB 120227A: RAPTOR Limit During the Gamma-Ray Emitting Interval
- GRB 120226A: Fermi-LAT detection of a burst
- Fermi GBM detection of an SGR-like burst
- GRB 120212A: Fermi GBM observation
- IPN Triangulation of GRB 120129A (long/intense)
- Fermi GBM trigger 120123.169 is not a GRB
- GRB 120119A: Fermi GBM observation
- GRB 120114A found in ground analysis of BAT data
- GRB 120107A: Suzaku WAM observation of the prompt emission
- GRB 120107A: Fermi GBM observation
- Konus-Wind observation of GRB 120107A
- IPN Triangulation of GRB 120107A
- GBM trigger 347620337 (GRB 120107A?) : High-energy photon emission in Fermi/LAT data
- GRB 111222A: Fermi GBM observations
- GRB 120102A: Fermi GBM observation
- FERMI GRB111228.45: MASTER observations
- GRB 111228A: Fermi GBM observation
- IPN Triangulation of GRB 111222A (short/hard/intense)
- GRB 111210A: optical upper limit of Mt. Terskol observatory
- GRB 111103A: optical upper limit of Mt. Terskol observatory
- GRB 111211A: optical ovservations at Mt. Terskol observatory
- GRB 111208A found in ground analysis of BAT data
- GRB 111201A found in ground analysis of BAT data
- GRB 111117A: Fermi GBM observation
- GRB 111103B: optical upper limit of Mt. Terskol observatory
- GRB 111107A: Fermi GBM observation
- GRB 111103A: Fermi GBM observation
- GRB 111017A: Fermi GBM Detection
- GRB 111003A: Fermi GBM detection
- Fermi GBM triggers 110923481, 110924391 and 110925200 are not GRBs
- GCN for GRB 110921B
- GRB 110921A: Fermi GBM observation
- IPN triangulation of GRB 110918A (long duration, extremely intense)
- GRB 110903A: Fermi GBM observation
- GRB110825A: Fermi GBM observation
- IPN triangulation of GRB110825A (very intense, long-duration)
- Fermi GBM trigger 110823.518 is not a GRB
- GRB 110818A: Fermi GBM observation
- Fermi Gamma-ray Burst Monitor trigger 110809.346 is not a GRB
- Swift SGR 1834.9-0846: Swift-BAT refined analysis
- Fermi GBM detection of a SGR-like burst
- Fermi Gamma-ray Burst Monitor trigger 110806.263 is not a GRB
- Fermi GBM trigger 334123030 (110804165) is not a GRB
- EVLA observation for Fermi burst GRB 110721A
- GRB 110731A : Suzaku WAM observation of the prompt emission
- AXP 4U 0142+61: Fermi GBM detection
- Konus-Wind observation of GRB 110731A
- GRB 110731A: Fermi GBM observation
- Fermi-LAT Detection of GRB110731A
- GRB 110721A: Swift observations of afterglow candidate
- IPN triangulation of GRB 110721A
- GRB 110721A: Preliminary Swift/UVOT Upper Limits
- GRB 110721A: potential counterpart candidate
- Konus-Wind observation of GRB 110721A