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"19415 results found.
- GRB 120811C: TAROT Calern observatory optical observations
- GRB 120811C: Swift detection of a burst with an optical counterpart
- IPN Triangulation of short hard GRB 120811B
- Trigger 530588: Swift detection of XMM J174457-2850.3
- Swift Trigger 530581: GRB 120811A or a galactic transient
- GRB 120803A: optical upper limit
- GRB 120807A: Swift/UVOT Upper Limits
- GRB 120803A: Confirmation of the X-ray afterglow
- GRB 120804A: Konus-Wind and Swift/BAT joint spectral analysis
- Swift Trigger 530441 is a false trigger
- GRB 120807A: Swift-XRT refined Analysis
- GRB 120807A: Fermi/LAT upper limit
- GRB 120807A: RAPTOR Limits During Gamma-Ray Emitting Interval
- GRB 120807A: TAROT La Silla observatory optical observations
- GRB 120807A: Swift-BAT refined analysis
- GRB 120807A: Enhanced Swift-XRT position
- GRB 120807A: Swift detection of a burst
- Fermi/GBM detection of an SGR-like burst
- Swift-BAT trigger 530214 is noise
- GRB 120805A: Swift/UVOT Upper Limits
- Swift trigger 530214: uncertain if real or not
- Swift-BAT trigger 529813 is due to noise while entering the SAA
- GRB 120728A: Fermi GBM observation
- GRB 120805A: Swift-BAT refined analysis
- GRB 120802A: Swift/UVOT Upper Limits
- GRB 120805A: Swift-XRT refined Analysis
- GRB120805A: Liverpool Telescope observations
- GRB 120805A: TAROT Calern observatory optical observations
- GRB 120805A: Swift detection of a burst
- GRB 120804A: EVLA Detection
- GRB 120804A: Swift-BAT Spectral lag analysis
- GRB 120803B: Swift-XRT refined Analysis
- GRB 120804A: Swift/UVOT Upper Limits
- GRB 120804A: Swift-BAT refined analysis
- GRB 120804A: Swift-XRT refined Analysis
- GRB 120804A: GROND upper limits
- GRB 120802A: EVLA Observations
- GRB 120804A: Enhanced Swift-XRT position
- GRB 120804A: Swift detection of a short burst
- GRB 120803B: Swift-BAT refined analysis
- GRB 120803B: Enhanced Swift-XRT position
- GRB 120803A: Swift-XRT Observations
- GRB 120803A: Swift-BAT refined analysis
- GRB 120803B: Swift detection of a burst
- GRB 120803A: Swift detection of a possible burst
- GRB 120802A: GRT Optical Observation
- GRB 120802A: Swift-XRT refined Analysis
- GRB 120729A: Fermi GBM observation
- GRB 120802A: Swift-BAT refined analysis
- GRB 120802A: Enhanced Swift-XRT position
- GRB 120802A: MASTER optical observations
- GRB 120802A: Swift detection of a burst
- GRB 120729A: RTT150 optical observations
- GRB 120729A: EVLA Observations
- GRB 120729A: Early RAPTOR Observations
- GRB 120728A: GROND Afterglow discovery
- GRB 120729A: Swift-XRT refined Analysis
- Correction to Swift GCN Circular 13538
- GRB 120729A: Swift/UVOT Detection
- Swift Trigger 529076 is from Swift J1910.2-0546 and is not a GRB
- GRB 120729A, Swift-BAT refined analysis
- GRB 120728A, Swift-BAT refined analysis
- GRB 120729A: Enhanced Swift-XRT position
- GRB 120728A: Swift/UVOT Upper Limits
- GRB120729A - Faulkes Telescope North Optical Afterglow Candidate
- GRB 120729A: Swift detection of a burst with an optical afterglow
- GRB 120728A: Swift-XRT refined Analysis
- GRB 120728A: Enhanced Swift-XRT position
- Trigger 529076: Swift possible detection of SwJ1910.2-0546
- GRB 120728A: GROND observations
- GRB 120728A: Swift detection of a burst
- Swift Trigger 528925 is probably a noise fluctuation
- GRB 120722A: optical upper limit
- GRB 120724A: optical observation in Maidanak observatory
- GRB 120724A, Swift-BAT refined analysis
- GRB 120724A: Swift/UVOT Detection of the Optical Afterglow
- GRB 120724A: Enhanced Swift-XRT position
- GRB 120724A: Swift-XRT refined Analysis
- GRB 120724A: Swift detection of a burst
- GRB 120709A: Swift re-observation of the field of the X-ray counterpart candidate.
- GRB 120722A: Swift/UVOT Upper Limits
- GRB 120722A: GROND detection of the afterglow
- GRB 120722A: Swift-XRT refined Analysis
- GRB 120722A: Swift-BAT refined analysis
- GRB 120722A: Enhanced Swift-XRT position
- GRB 120722A: Swift detection of a burst
- GRB 120716A: EVLA Detection
- GRB 120716A: Swift-XRT detection
- GRB 120716A: Swift/XRT position consistent with that of the optical counterpart
- GRB 120716A: GROND confirmation of the optical/NIR afterglow
- GRB 120714B: Swift/UVOT Detection
- GRB 120714B: Swift-XRT refined Analysis
- GRB120714A: Swift/UVOT upper limits
- GRB 120714B: Swift-BAT refined analysis
- Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
- GRB 120714A: GROND upper limits
- GRB 120714B: GROND confirmation of fading afterglow
- GRB 120714A: Swift-XRT refined Analysis
- Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
- GRB 120714B: Position Correction and Candidate Optical Afterglow