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"3674 results found.
- GRB 120815A: Swift-BAT refined analysis
- GRB 120807A: Enhanced Swift-XRT position
- GRB 120807A: Swift detection of a burst
- Fermi/GBM detection of an SGR-like burst
- GRB 120728A: Fermi GBM observation
- GRB 120805A: Swift detection of a burst
- GRB 120804A: EVLA Detection
- GRB 120804A: Gemini-North observations
- GRB 120803B: MITSuME Akeno Optical upper limits
- GRB 120728B: Fermi GBM detection
- IPN Triangulation of GRB 120728B (long/intense)
- Swift Trigger 529076 is from Swift J1910.2-0546 and is not a GRB
- GRB 120728A: GROND observations
- GRB120711A: Planned XMM-Newton observation
- IPN Triangulation of unusual GRB 120716A
- IPN Triangulation of GRB 120707A
- GRB 120624B: mm detection at PdBI
- Fermi Gamma-ray Burst Monitor trigger 120628.973 is not a GRB
- IPN Triangulation of GRB 120624A (short/intense)
- Konus-Wind observation of GRB 120617A
- IPN Triangulation of GRB 120617A (short/intense)
- IPN Triangulation of GRB 120602A (long/very bright)
- GRB 120521C: Early Tautenburg limits
- GRB 120521B: Swift-XRT refined Analysis
- GRB 120510A: Swift XRT and UVOT observations
- GRB 120427A: MASTER follow up observations
- IPN Triangulation of GRB 120427A
- GRB 120328B: Pi of the Sky simultaneous upper limits
- GRB 120402A: Swift detection of a possible burst or noise
- GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
- GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
- GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
- GRB 120328B: Fermi-LAT Observations
- GRB 120328B: Fermi GBM detection
- long/intense GRB 120328B: MASTER follow up observations
- GRB 120326A: Bassano Bresciano Observatory further optical observations
- GRB 120316A : Suzaku WAM observation of the prompt emission
- GRB 120320A, the review of the sky area in plate archives
- IPN Triangulation of GRB 120316A
- GRB 120312A: Swift detection of a burst
- GRB 120305A: EVLA deep limit on a radio counterpart
- GRB 120305A: MASTER-NET early optical observations
- Konus-Wind observation of GRB 120226A
- GRB 120218A: Swift-BAT refined analysis
- GRB 120213A: MASTER-NET early optical observations
- GRB 120213A: Swift detection of a burst
- GRB 120211A: Swift detection of a burst
- GRB 120127A / P48 Imaging
- GRB 120119A: Swift/UVOT Observations
- GRB 120116A: Swift detection of a burst
- GRB 111225A: optical observations in CrAO
- GRB 111228A: MASTER-Net optical photometry
- GRB 111228A: Optical and NIR observations with Kanata telescope
- GRB111228A: Further GMG observations
- GRB 111228A: T100 observations
- GRB111228A: MITSuME Akeno photometry of the optical afterglow
- GRB 111228A: GMG optical observation
- GRB 111228A: MASTER OT observations
- GRB 111228A: Fermi GBM observation
- GRB111228A: MITSuME Okayama Optical Observation
- GRB 111215B: Suzaku WAM observation of the prompt emission
- Konus-Wind observation of GRB 111215B
- IPN Triangulation of GRB 111215B (long/intense)
- GRB 111215A: MASTER-Net optical prompt and follow up observations
- GRB 111215A: Swift detection of a burst
- GRB 111209A: PROMPT optical observations of early afterglow
- GRB 111208A found in ground analysis of BAT data
- GRB 111204A: Swift detection of a burst
- GRB 111123A: Swift detection of a burst
- GRB 111107A: GROND observations
- Trigger 506913: MASTER detection of Swift J1922.7-1716 optical counterpart
- Swift-BAT trigger 506884 is not a GRB
- GRB 111018A: Swift detection of a burst
- GRB 111016A: Swift-BAT refined analysis
- GRB 111016A: Swift detection of a burst
- Konus-Wind observation of GRB 111008A
- GRB 111008A, Swift-BAT refined analysis,
- GRB 110928A: P60 Observations
- GRB 110928A: Further PAIRITEL NIR Observations
- GRB 110928A: PAIRITEL NIR Observations
- MAXI/GSC detection of a short soft X-ray transient
- GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
- GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
- GRB 110731A: SAO RAS and Terskol observations
- GRB 110820A: optical upper limit
- IPN triangulation of GRB110825A (very intense, long-duration)
- GRB 110820A: MASTER-NET first hour observations
- IPN triangulation of GRB110815A (long, intense)
- GRB110731A: Swift/UVOT Observations
- GRB 110731A: FTN+FTS afterglow observations
- GRB 110731A: Swift detection of a burst with an optical counterpart
- IPN triangulation of GRB 110721A
- GRB 110715A optical observations
- Konus-Wind observation of GRB 110708B
- GRB 110709B BAT refined analysis
- Konus-Wind observation of GRB 110709B
- GRB 110709B: Preliminary Swift-BAT refined analysis
- SGR 1E 1841-045: early optical limit by "Pi of the Sky"
- GRB 110625A: Fermi LAT detection
- GRB 110625A: Swift detection of a burst