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"11519 results found.
- GCN for GRB 120811C
- Improved IPN error box for short hard GRB 120811B
- IPN Triangulation of short hard GRB 120811B
- GRB 120807A: Fermi/LAT upper limit
- Fermi/GBM detection of an SGR-like burst
- GRB 120728A: Fermi GBM observation
- GRB 120729A: Fermi GBM observation
- GRB 120728B: Fermi GBM detection
- IPN Triangulation of GRB 120728B (long/intense)
- GRB 120727A/Galactic source: Fermi-LAT detection of a transient source
- GRB 120709A: Swift re-observation of the field of the X-ray counterpart candidate.
- GRB 120716A: Fermi GBM observation
- IPN Triangulation of unusual GRB 120716A
- Fermi GBM trigger 120716.498 is not a GRB
- GRB 120624B: VLA Observations
- GRB 120712A: Fermi GBM observation
- IPN Triangulation of GRB 120709A
- GRB 120711A: Fermi LAT Detection
- Konus-Wind observation of GRB 120711A
- GRB 120711A: Fermi LAT detection
- GRB 120711A: MASTER early OT detection
- Konus-Wind observation of GRB 120709A
- GRB 120711A: GROND photometric redshift
- GRB 120711A: Fermi GBM observation
- GRB 120709A: Fermi GBM detection
- GRB 120709A: Swift-XRT observations
- GRB 120709A: Matched filter analysis of Fermi-LAT data
- Konus-Wind observation of GRB 120707A
- IPN Triangulation of GRB 120707A
- GRB 120709A: Fermi-LAT Detection
- GRB 120707A: Fermi GBM Detection of a Bright Burst
- GBM triggers 120705.153 & 120705.322 were not GRBs
- GRB 120703A: Fermi GBM detection
- GRB 120624B Suzaku WAM observation of the prompt emission
- Fermi Gamma-ray Burst Monitor trigger 120628.973 is not a GRB
- GRB 120624B: GROND upper limits
- GRB 120624B: NIR counterpart candidate from HAWKI
- GRB 120624B: Discussion of Fermi and Swift measurements and future Swift observations
- GRB 120624B: NOT optical upper limit
- 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