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"26270 results found.
- GRB 060413: XRT refined analysis
- GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
- GRB 060413: Swift detection of a burst
- GRB060403: XRT refined analysis
- GRB 060403: Swift/UVOT upper limits
- GRB 060403: Refined analysis of the Swift-BAT burst
- Konus-Wind observation of the recent SGR 1900+14 activity. Will
- GRB 060403: Swift detection of a burst
- HETE trigger H4044: RTT150 optical observations
- HETE Trigger 4043: ROTSE-III Optical Limits
- SGR 1900+14: Swift-BAT detection of a cluster of outbursts
- SGR 1900+14: Swift-BAT detection of a bright outburst
- GRB 060323 : WIDGET simultaneous optical observations
- GRB 060323: Early optical observation at Xinglong
- SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
- SGR 1900+14: Swift detection of renewed activity
- GRB 060322: Swift XRT afterglow candidate
- GRB 060323: Swift/UVOT Observations
- GRB 060323: Optical Observations
- GRB 060323: Refined analysis of the Swift-BAT burst
- GRB 060323: Swift XRT refined analysis
- GRB 060322: Refined analysis of the Swift-BAT burst
- GRB060323 - SDSS Pre-Burst Observations
- GRB 060323: Swift detection of a burst with a possible optical afterglow
- GRB 060322: Swift-BAT detection of a 200-sec burst
- GRB060319: Swift XRT refined analysis
- GRB060319: Swift/UVOT upper limits
- GRB 060319: Swift-BAT refined analysis
- GRB060319 - SDSS Pre-burst Observations
- GRB 060319: Swift detection of a burst
- Konus-Wind observation of GRB 060313
- GRB 060313: Further analysis of the Swift-BAT bright short hard burst
- GRB 060313: Swift/UVOT Observations
- GRB 060313: Swift-XRT team refined analysis
- GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
- GRB 060313: Swift-BAT detection of a bright short hard burst
- GRB060218: SARA Observations of SN2006aj
- GRB060312: Swift UVOT observation
- GRB 060312: Refined analysis of the Swift-BAT burst
- GRB 060312: Swift XRT team refined analysis
- GRB060306: APO Ks-band Imaging Observations
- GRB 060312: ROTSE-III Optical Limits
- GRB 060312: Swift detection of a burst
- GRB060219: Liverpool Telescope observations
- GRB060218: analysis of the XMM-Newton observation
- Swift/UVOT observations of GRB060306
- GRB 060306: Swift-BAT refined analysis
- GRB 060306: Swift-XRT team refined analysis
- GRB 060306: Swift detection of a bright burst
- GRB 060223b: Swift/UVOT Upper Limits
- GRB 060223B: Swift XRT possible afterglow
- GRB 060204B: GETS early limit
- GRB 060223A:Xinglong optical limits
- GRB 060223B: ART optical limits
- GRB 060223B: Swift-BAT refined analysis
- GRB 060223a: Swift/UVOT refined analysis
- GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
- GRB 060223B: Swift detection of a bright burst
- GRB 060223: Swift-BAT refined analysis
- GRB 060218: rebrightening
- GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
- GRB 060223: Swift detection of a burst
- GRB 060219: Swift-BAT refined analysis
- GRB 060218: Further refined analysis of the Swift-BAT burst
- GRB 060218: Optical Observations at Xinglong Obs.
- GRB060218: UV Detection and Light Curves
- GRB060219: SARA Observations
- GRB 060219: Swift/UVOT Upper Limits
- GRB 060219: Swift-XRT Team refined analysis
- GRB 051221B: Swift-XRT Team Refined Analysis
- GRB 060219: Partial refined analysis of the Swift-BAT burst
- GRB060219: SDSS pre-burst observations
- GRB 060219: Swift-BAT detection of a weak burst
- GRB060218: Swift/XRT Team preliminary analysis of the possible burst
- Brightening of the Optical Counterpart of the Possible GRB 060218
- GRB 060218: Pre-burst detection of a possible host galaxy
- GRB 060218A: ROTSE-III Possible Optical Flare
- GRB060218: Swift/XRT refined position of a possible burst
- Preliminary refined analysis of the Swift-BAT trigger 191157
- Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
- GRB 060211B: Swift/UVOT Upper Limits
- GRB060218 : SDSS pre-burst observations
- GRB 060218: Swift XRT Position
- GRB 060218: Swift-BAT detection of a possible burst
- GRB060213: Swift XRT observations and possible afterglow candidate
- GRB 060211b: WIRO NIR Observations
- GRB060206: Swift XRT observations of an unbroken powerlaw decay
- GRB 060211a: WIRO NIR Observations
- GRB 060211A: Further refined analysis of the Swift burst
- GRB 060211A: Partial refined analysis on the Swift-BAT burst
- GRB 060210: Further refined analysis of the Swift-BAT burst
- GRB 060211B: Swift/BAT refined analysis
- GRB060210: Swift/UVOT Upper Limits
- GRB 060211B: Swift-XRT Team refined analysis
- GRB 060210: Optical Observations
- GRB 060211A: Swift XRT Team Refined Analysis
- GRB 060211B: Swift-BAT detection of a burst
- GRB060211: Faulkes North observation
- GRB 060211: Swift detection of a long burst
- GRB 060210: Refined analysis of the Swift-BAT burst