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"35985 results found.
- GRB 071129, Swift-BAT refined analysis
- GRB 071129: Swift detection of a burst
- Konus-Wind and Konus-A observations of GRB 071125
- IPN triangulation of very bright GRB 071125
- GRB 071112C: Optical/NIR observations
- Disregard the "GRB 071126" position
- GRB 071126: Enhanced Swift-XRT position
- VLA radio detection of GRB 071122
- GRB071122: Swift/UVOT Observations
- GRB071104: NIR Afterglow Candidate at TNG
- GRB 071122: MASTER optical observation
- GRB 071122, Swift-BAT refined analysis
- GRB 071122 Swift XRT position update sent in error.
- GRB 071122 Swift-XRT refined analysis
- GRB 071122: Corrected P60 Coordinates
- GRB071122: Gemini Absorption redshift
- GRB 071122: P60 Optical Afterglow Candidate
- GRB 071122: ROTSE-III Optical Limits
- GRB 071122: Swift detection of a burst
- GRB 071118: P60 Observations
- GRB071118 MITSuME OAO optical observation
- GRB 071118: Observations from OSN
- GRB 071117: VLT observations and probable redshift
- Swift/UVOT observations of GRB071118
- GRB 071117: Swift-XRT revised position
- Konus-Wind and Konus-A observations of GRB 071117
- Swift XRT follow-up observations of GRB071008
- Swift/UVOT upper limits for GRB 071117
- GRB071118: Swift XRT refined analysis
- GRB 071117: Gemini Optical Afterglow Discovery
- GRB 071118, Swift-BAT refined analysis
- GRB 071117: TAROT La Silla observatory optical observations
- GRB 071112B: Gemini Image Differencing
- GRB 071118: Swift detection of a burst
- GRB 071117: Gemini Observations
- GRB 071117: Las Campanas optical observations
- GRB 071117: Swift-XRT refined analysis
- GRB 071117, Swift-BAT refined analysis
- VLT FORS2 observations of short hard GRB071112B
- GRB 071117: Swift/XRT position
- GRB 071117: Initial Swift/UVOT observations
- GRB 071117: Swift detection of a bright burst
- VLA radio upper limit on GRB 071112C
- ATCA radio observations of short hard burst GRB 071112B
- GRB 071112C: Optical and NIR data observed with KANATA
- GRB 071112C: WSRT Radio Observations
- GRB 071112C: optical observation
- GRB 071112C: optical observation
- GRB 071112C: emission lines and refined VLT redshift
- GRB 071112C MITSuME Akeno early optical observation
- GRB 071112C: Gemini Absorption Redshift
- GRB 071112B: 2nd epoch of Magellan i-band imaging
- GRB 071112C: SARA upper limit
- GRB 071112C : Second Epoch Lulin R-band observations
- GRB071112C MITSuME Okayama Optical Observation
- GRB 071112C: Swift-BAT refined analysis
- GRB 071112C: Swift/UVOT observations
- GRB 071112C: Swift XRT refined analysis
- GRB 071112C: Optical observations at Crni Vrh
- Swift UVOT upper limits of GRB071112B
- GRB 071112C: VLT redshift
- GRB 071112B: Magellan i-band imaging
- GRB 071112B: Gemini Optical Imaging (Correction)
- GRB 071112B: Gemini Optical Imaging
- GRB 071112B: Swift-XRT preliminary analysis
- GRB 071112B, Swift-BAT partial refined analysis of the SHB
- GRB071112C: NOT observations
- GRB 071112C: Palomar Pre-Imaging
- Swift-BAT trigger 296491 is not a GRB
- GRB 071112C : Lulin R-band observation
- GRB 071112C: RTT150 optical observations
- GRB 071112C: TAROT Calern observatory optical observations
- Swift XRT follow-up observations of GRB071028B
- GRB 071112C: Optical and NIR afterglows observed with KANATA
- GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
- GRB 071112B: ROTSE-III Rapid Optical Limits
- GRB 071112C: Swift detection of a burst with an optical counterpart
- GRB 071112B: Swift detection of a short hard burst
- GRB 071112: Swift detection of a possible burst
- VLA IInd observation of INTEGRAL burst GRB 071109
- Swift/UVOT initial analysis of GRB071109
- GRB 071109: further Swift-XRT analysis
- GRB 071109: TAROT Calern observatory optical observations
- No radio detection at Swift-XRT position
- GRB 071109: Swift-XRT possible X-ray counterpart
- VLA prompt radio detection of the INTEGRAL burst 071109
- GRB 071109: IBIS refined analysis
- GRB 071109: BOOTES-2 prompt optical observations
- GRB 071109: A long GRB detected by INTEGRAL
- GRB 071104: Swift-XRT Team Refined Analysis
- GRB 071104: Possible Swift UVOT Afterglow Candidate
- GRB 071104: Swift-XRT position
- GRB 071104: Gamma Ray Burst Localization by SuperAGILE
- GRB071010b: optical observation
- Swift XRT and UVOT observations of GRB071028B
- GRB 071101, Swift-BAT refined analysis
- GRB 071101: Swift-XRT Team refined analysis
- GRB071101: Optical and NIR upper limits by KANATA
- GRB 071101: TAROT Calern observatory optical observations
- GRB 071101: Swift XRT position