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"27808 results found.
- GRB 071117: Initial Swift/UVOT observations
- GRB 071117: Swift detection of a bright burst
- Swift detection of MXB 0656-072
- VLA radio upper limit on GRB 071112C
- ATCA radio observations of short hard burst GRB 071112B
- Correction to the Swift-BAT Transient Identification (trigger=296683)
- GRB 071112C: 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 071112B: Swift-XRT preliminary analysis
- GRB 071112B, Swift-BAT partial refined analysis of the SHB
- Swift-BAT trigger 296491 is not a GRB
- GRB 071112C: TAROT Calern observatory optical observations
- Swift XRT follow-up observations of GRB071028B
- 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
- 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 071104: Swift-XRT Team Refined Analysis
- GRB 071104: Possible Swift UVOT Afterglow Candidate
- GRB 071104: Swift-XRT position
- Swift XRT and UVOT observations of GRB071028B
- GRB 071101, Swift-BAT refined analysis
- GRB 071101: Swift-XRT Team refined analysis
- GRB 071101: TAROT Calern observatory optical observations
- GRB 071101: Swift XRT position
- GRB 071101: BOOTES-2 prompt optical observations
- GRB 071101: a nearby galaxy
- 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 071031: VLT high-resolution spectroscopy
- GRB 071031: GROND detection in all bands
- GRB 071031: Swift detection of a burst with an optical counterpart
- GRB 071028B Swift-BAT detection of a burst
- GRB 071028: SARA observations of variable source
- Swift UVOT upper limits to GRB071028
- GRB 071028: Swift-XRT Team refined analysis
- GRB 071028, Swift-BAT refined analysis
- GRB 071028: Swift detection of a burst
- GRB 071025: Kuiper Telescope Optical Observations
- GRB 071018: Revised BAT position
- GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
- GRB071021: MARGE Optical Limits
- GRB071020, optical upper limit
- GRB 071025 Milagro GeV/TeV Observations
- Swift UVOT upper limits
- GRB 071025: Swift-XRT Team refined analysis
- GRB 071025, Swift-BAT refined analysis
- GRB 071025: Early Super-LOTIS Observations
- GRB 071025: R/I-band update
- GRB 071025: ROTSE-III Refined Analysis
- GRB 071025: I-detection, R-dropout?
- GRB 071025: Swift XRT refined position
- GRB 071025: ROTSE-III Detection of Optical Counterpart
- GRB 071025: Swift detection of a burst
- GRB 071021: R-band detection and analysis
- GRB 071020: BTA spectroscopy
- GRB071021: Optical+NIR observations
- Possible radio detection of GRB 071021 with the VLA
- Optical observations of GRB 071020
- GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
- Radio detection of GRB 071020 with the VLA
- GRB 071021: Magellan i-band observation
- GRB 071021: Z-band detection
- GRB 071010B: Fading quickly
- GRB 071021: optical and NIR observations
- GRB 071021: possible high-z burst
- GRB 071021, Swift-BAT refined analysis
- GRB 071021: Swift-XRT Team refined analysis
- Konus-Wind observation of GRB 071020
- GRB 071021: Swift detection of a burst
- GRB 071020: Swift-XRT refined analysis
- GRB 071020, Swift-BAT refined analysis
- GRB 071020: ROTSE-III Analysis of Optical Counterpart
- GRB071020 - SDSS Pre-burst Observations
- GRB 071020: Swift detection of a bright burst
- GRB 071020A: ROTSE-III Detection of Optical Counterpart
- GRB 071018: Mercator Telescope optical observations
- Swift autonomous slewing re-enabled
- GRB 071018: Swift-XRT observation
- GRB 071017 - Swift XRT observations
- VLA radio observation of GRB 071018
- 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 071010B: Keck/DEIMOS emission-line redshift