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"4057 results found.
- Disregard the "GRB 071126" position
- Swift autonomous slewing re-enabled
- GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
- GRB 071003: Possible rebrightening
- Update on Swift Status
- Swift Status and XRT Calibration Uncertainties
- GCN Swift XRT update position notices and enhanced position circulars
- Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
- GRB 070125: Break in Optical Decay
- GRB 060929: Further XRT Refined Analysis
- test of new software, grb
- GRB 060927: Early color
- GRB 060526: Break in X-ray light curve
- GRB 051221: Improved astrometry of the IR counterpart
- GRB051105: optical observations
- GRB 051105a: MDM Observations
- Swift-BAT trigger 147918 is not a real GRB
- GRB 050721A: Swift-BAT refined analysis
- Swift BAT Trigger 146986 is SWIFT J1753.5-0127
- Retraction of three Swift GRB triggers
- GRB 050319: ROTSE-III Refined Analysis
- SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
- GRB041006: MASTER optical observations
- IBAS GRB Alerts 1978-1980
- IPN Summary of SGR1806-20 Activity in 2004
- GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
- On Line Availability of Archival HETE Fregate Data and Lightcurves
- GRB 040223 XMM-Newton observation ...
- Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
- XRF030723 (=H2777): Second Epoch Magellan Observations
- GRBlog: Compilation of all GCN Circ. data
- GRB 030329 and SN 2003dh
- GRB030329: multiple re-brightening phases
- GRB: Non-Referencing of GCN Circulars.
- GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
- Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
- Distribution of INTEGRAL SPI-ACS triggers
- GRB021016(=H2397): A Long GRB Localized by HETE
- GRB 021004: Optical observations, AUDE network
- IPN GCN Circulars now to be issued without restriction
- GRB/XRF 020427, detection of an underlying system with the VLT
- HETE Fully-Automated GCN Notices
- Congratulate Scott on the 1000th GRB Coordinates Network Circular!
- HETE Status
- HETE positions added to GCN
- RE: Budget cuts in BeppoSAX operations: impact on GRB observation
- GRB000301c results
- Optical observations of GRB000301c
- GCN resumes full operations
- X-ray/GRB 1SAX J0835.9+5118, Optical Observations
- BeppoSAX: A new fast X-ray transient
- GRB 990506, Optical Observations
- GRB 990123: near-infrared observations.
- GRB981226, BeppoSAX Christmas GRB
- GRB980515, BeppoSAX IAUC to be submitted
- IPN web site of GRBs
- GRB980329, Fading IR counterpart to radio source