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"23151 results found.
- GRB071104: NIR Afterglow Candidate at TNG
- GRB 071122: MASTER optical observation
- GRB 071122, Swift-BAT refined analysis
- GRB 071122 Swift-XRT refined analysis
- GRB 071122: Swift detection of a burst
- GRB071118 MITSuME OAO optical observation
- Swift/UVOT observations of GRB071118
- Konus-Wind and Konus-A observations of GRB 071117
- GRB 071118, Swift-BAT refined analysis
- GRB 071117: TAROT La Silla observatory optical observations
- GRB 071118: Swift detection of a burst
- GRB 071117, Swift-BAT refined analysis
- GRB 071117: Swift detection of a bright burst
- Swift detection of MXB 0656-072
- GRB 071112C: Optical and NIR data observed with KANATA
- GRB071112C: Errata of MITSuME Ic band photometry
- GRB 071112C: emission lines and refined VLT redshift
- GRB 071112B: 2nd epoch of Magellan i-band imaging
- GRB 071112C : Second Epoch Lulin R-band observations
- GRB071112C MITSuME Okayama Optical Observation
- GRB 071112C: Swift-BAT refined analysis
- GRB 071112C: Swift XRT refined analysis
- Swift UVOT upper limits of GRB071112B
- GRB 071112C: VLT redshift
- GRB 071112B: Swift-XRT preliminary analysis
- GRB 071112B, Swift-BAT partial refined analysis of the SHB
- GRB 071112C : Lulin R-band observation
- GRB 071112C: RTT150 optical observations
- GRB 071112C: TAROT Calern observatory optical observations
- GRB071112C Xinglong_TNT_and_EST_afterglow observations
- GRB 071112C: Optical and NIR afterglows observed with KANATA
- GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
- 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
- Swift/UVOT initial analysis of GRB071109
- GRB 071109: further Swift-XRT analysis
- GRB 071109: TAROT Calern observatory optical observations
- GRB 071109: Swift-XRT possible X-ray counterpart
- GRB 071109: A long GRB detected by INTEGRAL
- GRB 071104: Gamma Ray Burst Localization by SuperAGILE
- GRB 071101, Swift-BAT refined analysis
- GRB071101: Optical and NIR upper limits by KANATA
- GRB0711101: Two new source from Xinglong TNT observation
- GRB 071101: TAROT Calern observatory optical observations
- GRB071101 LOAO B,V,R,I observation
- GRB 071101: Swift detection of a burst
- GRB 071031, Swift-BAT refined analysis
- GRB 071031: Swift/UVOT detection of afterglow
- GRB 071031: Swift-XRT Team refined analysis
- GRB 071020: MITSuME Akeno optical observations
- GRB071031: Rapid PROMPT Detections
- GRB 071031: Swift detection of a burst with an optical counterpart
- GRB071028: Xinglong EST V-band upper limit
- GRB 071028, Swift-BAT refined analysis
- GRB 071028: Swift detection of a burst
- GRB 071003: Infrared Photometry with Keck Adaptive Optics
- GRB071021: MARGE Optical Limits
- GRB 071025 Milagro GeV/TeV Observations
- GRB071025: Xinglong TNT I-band upper limit
- GRB 060602A: host redshift
- GRB 071025, Swift-BAT refined analysis
- GRB 071025: Early Super-LOTIS Observations
- GRB 071025: R/I-band update
- GRB 071025: I-detection, R-dropout?
- GRB 071020: BTA spectroscopy
- GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
- GRB071021: MITSuME Okayama Optical Upper Limits
- GRB 071021: Magellan i-band observation
- GRB 071021: correction to GCNC 6968
- GRB 071020: Fading slowly?
- GRB 071010B: Fading quickly
- GRB 071021: optical and NIR observations
- GRB 071021, Swift-BAT refined analysis
- GRB071018: 2nd epoch obsevations of Xinglong TNT
- GRB 071021: Xinglong TNT optical Upper Limit
- GRB 071021 : Lulin R-band limit
- Konus-Wind observation of GRB 071020
- GRB 071021: Faulkes Telescope South optical candidate
- GRB 071021: Swift detection of a burst
- GRB 071010B: Independent Confirmation of Break
- GRB071020A: Xinglong TNT Optical afterglow observations
- GRB 071020, Swift-BAT refined analysis
- GRB 071020: VLT spectroscopy
- GRB071020 - SDSS Pre-burst Observations
- GRB 071020: Swift detection of a bright burst
- GRB 071018: Mercator Telescope optical observations
- GRB071010b: optical observations
- GRB071018: Correction to the GCN 6936
- GRB071018: Correction to the GCN 6936
- GRB071018: Correction to the GCN 6936
- GRB 071018: Possible OT from Xinglong TNT observation
- GRB 071010B: Light Curve Break Confirmed
- GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
- GRB 071018, Swift-BAT refined analysis
- GRB 071018?: Swift detection of a possible burst
- GRB 071010B: Suzaku WAM observation of the prompt emission
- GRB 071013: 3rd TLS Epoch - constraints on variability
- GRB 071013: TNT optical data refined analysis
- GRB 071010B: Keck/DEIMOS emission-line redshift