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"19875 results found.
- GRB060825: BOOTES-IR optical observations
- GRB 060825: Swift detection of a burst
- GRB060729: analysis of XMM-Newton observation
- GRB 060814: pseudo-z from spectral parameters of the prompt
- Radio observations of GRB 060719
- GRB060814: Break in the XRT light curve
- GRB060813: Break in the XRT light curve
- GRB 060813: A long, bright GRB detected with Suzaku WAM
- Konus-Wind observation of GRB 060814
- GRB 060814: Refined analysis of the Swift-BAT burst
- GRB060805B: optical observations
- GRB060814: Swift/UVOT upper limits
- GRB 060813: pseudo-z from spectral parameters of the prompt
- GRB 060814: Swift XRT refined analysis
- GRB 060814 - SDSS Pre-Burst Observations
- GRB 060814: TAROT optical observations
- GRB 060814: Swift detection of a bright burst
- Konus-Wind observation of GRB 060813
- GRB060813: Swift/UVOT upper limits
- GRB 060813: Swift XRT refined analysis
- GRB 060813: Refined analysis of the Swift-BAT burst
- GRB 060813: Swift detection of a burst
- Image of the dust-scattering halo around SGR 1806-20
- Second VLA limit on new radio point source in SGR 1806-20
- A dust-scattering halo detected around SGR 1806-20
- Swift detection of an outburst from the 4U 1246-58 LMXB burster
- GRB060714: optical observations
- GRB 060729: An update on the Swift XRT and UVOT observations
- GRB060807: Optical limiting magnitudes
- GRB 060805B: optical observation at Sierra Nevada
- GRB 060805B: XRT Team Analysis
- VLA Upper Limit on Outburst of SGR 1806-20
- GRB060806 is similar to previous activity of SGR1806-20
- GRB 060807: UVOT Upper limits
- GRB 060807: XRT Team refined analysis
- GRB 060807: Refined analysis of the Swift-BAT burst
- IPN triangulation of GRB060806 (long, exceptionally bright)
- GRB060807 - SDSS Pre-burst Observations
- GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
- GRB 060805B: Swift/UVOT Upper Limits
- GRB 060807: Swift detection of a burst
- GRB 060805: XRT Team Refined Analysis
- GRB 060805: Swift-BAT Refined Analysis
- GRB 060805: Swift/UVOT Upper Limits
- GRB 060805: KAIT observations
- GRB 060805 - SDSS Pre-Burst Observations
- GRB 060805: Swift detection of a burst
- GRB 060804: Swift UVOT observations
- GRB 060804: Swift-XRT Team Refined Analysis
- GRB 060804: Refined analysis of the Swift-BAT burst
- GRB 060804: Swift detection of a burst with a possible UVOT counterpart
- GRB 060728: Upper limits of the X-ray emission
- GRB 060801: WSRT Radio Observations
- GRB060801: Radio Observations
- GRB060801: Swift/UVOT Upper Limits
- GRB 060801: optical observations at Hanle and Calar Alto
- GRB 060801: Swift XRT refined analysis
- GRB 060801: Refined analysis of the Swift-BAT short hard burst
- GRB 060801: Swift detection of a short burst
- GRB060729: ROTSE-III Observations of the Slow Optical Decay
- Swift-BAT trigger 221873 is not a GRB or a Transient
- GRB 060729: Swift/UVOT Detections
- GRB 060729: Refined analysis of the Swift-BAT burst
- GRB 060729: Swift-XRT refined analysis
- GRB 060729: Swift/UVOT Observations
- GRB 060729: ROTSE-III Detection of Optical Counterpart
- GRB 060729: Swift detection of a burst with an UVOT optical counterpart
- GRB 060728: Swift/UVOT Upper Limits
- GRB 060728: Refined analysis of the Swift-BAT burst
- Swift/XRT preliminary analysis
- GRB 060728: Swift detection of a burst
- GRB060614 ATCA Radio Limits
- GRB 060714: Swift/UVOT Observations
- GRB 060522: VLA observation
- GRB 060719: Swift/UVOT Upper Limits
- GRB 060719: Refined analysis of the Swift-BAT burst
- GRB 060719: XRT refined analysis
- GRB 060719: optical limit by Pi-of-the-Sky
- GRB060719: FRAM early follow-up limit
- GRB 060719: Swift detection of a burst
- GRB 060717: Swift XRT refined analysis
- GRB 060714: Refined analysis of the Swift-BAT burst
- GRB060717: Swift/UVOT upper limits
- GRB 060717: Swift XRT refined position
- GRB 060717: Swift-BAT refined analysis
- GRB 060717: Swift detection of a burst
- GRB 060714: Swift XRT refined analysis
- GRB060708: MARGE low resolution spectrum observations
- Swift-BAT trigger 219136 is not a GRB
- GRB060707 possible optical confirmation
- Swift trigger 219136 is probably not a GRB
- GRB 060714: Swift detection of a burst with an UVOT optical afterglow
- GRB 060712: XRT refined analysis
- GRB 060712: Swift/UVOT Upper Limits
- GRB 060712: XRT refined position
- GRB 060712: Refined analysis of the Swift-BAT burst
- GRB 060712: Swift detection of a burst
- GRB 060708: Swift-XRT refined analysis
- GCN 060708: Swift-UVOT Observations
- GRB 060708: Refined analysis of the Swift-BAT burst