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"40749 results found.
- GRB 140719B: Swift detection of a burst
- GRB 140719A: Swift-XRT refined Analysis
- GRB 140719A: Swift detection of a burst
- Konus-Wind observation of GRB 140716A
- GRB 140716A: Swift/UVOT Upper Limits
- GRB 140713A: AMI 15 GHz detection
- GRB 140713A: 10.4-m GTC deep optical observation
- GRB 140716A: GROND afterglow candidate
- GRB 140716A: Swift-XRT detection of an afterglow candidate
- GRB 140716A: A Fermi GBM Detection
- GRB 140716A BAT refined analysis
- Swift observations of a flare from UX Ari
- GRB 140716A found in ground analysis of Swift-BAT data
- GRB 140709A: Possible AMI 15 GHz detection
- Swift detection of UX Ari
- GRB 140713A: CARMA mm detection
- GRB 140714A: Fermi GBM detection
- Radio upper limits on the GRB 140703A with the GMRT
- GRB 140713A: Fermi GBM detection
- GRB 140713A: Swift-XRT refined Analysis
- GRB 140713A: Swift/UVOT Upper Limits
- GRB 140713A: NOT upper limits
- GRB 140713A : Xinglong TNT upper limit
- GRB 140713A: Swift-BAT refined analysis
- GRB 140713A: T100 observations
- GRB 140710A: iTelescope.Net T11 Optical Observation
- GRB 140713A: Swift detection of a burst
- Swift Trigger 604111 is not a GRB
- GRB 140710B: Fermi GBM detection
- GRB 140710B: improved INTEGRAL position
- Fermi GBM Observations of SGR 1935+2154
- GRB 140710B: a long GRB detected with INTEGRAL
- GRB 140709A: Continued RATIR Optical and NIR Observations
- GRB 140710A: Swift-XRT refined Analysis
- GRB 140710A: Swift-BAT refined analysis
- GRB 140710A: Swift/UVOT Upper Limits
- GRB 140709B: update of Khureltogot optical upper limit
- GRB 140710A: Gemini-N redshift of likely host
- GRB 140710A: RATIR Optical and NIR Observations
- GRB 140710A: P60 Confirmation of Afterglow
- GRB 140710A: correction to GCN #16565
- GRB 140710A: GROND Detection of NIR Afterglow Candidate
- GRB 140709A: 10.4m GTC optical decay
- GRB 140710A: Swift detection of a burst
- GRB 140709B: Swift-XRT refined Analysis
- GRB 140709B: Fermi GBM detection
- GRB 140709B: Swift-BAT refined analysis
- GRB 140709A : Virtual Telescope optical observations
- GRB 140709B: Khureltogot optical upper limit
- GRB 140709A: Fermi GBM detection
- GRB 140709A: BOOTES-2 and OSN optical observations
- GRB 140709A, Swift-BAT refined analysis
- GRB 140709B: MASTER optical observation
- GRB 140709B: Swift detection of a burst
- GRB 140709A: Swift-XRT refined Analysis
- GRB 140709A: Swift/UVOT Upper Limits
- GRB 140709A: RATIR Optical and NIR Observations
- GRB 140709A: Swift detection of a burst
- Fermi GBM trigger 140708682 is not a GRB
- GRB 140705A: Nishi-Harima NIR upper limits
- GRB 140703A: AMI 15 GHz detection
- GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
- GRB 140706A: Swift/UVOT Detection
- GRB 140703A: Swift/UVOT Upper Limits
- GRB 140706A: Swift-BAT refined analysis
- GRB 140706A: Swift-XRT refined Analysis
- GRB 140706A: Fermi GBM detection
- GRB 140703A: AAO optical observations
- Pre-discovery observations of SGR 1935+2154 in Swift archival data
- GRB140706A: GROND detection of the Optical/NIR afterglow
- GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
- GRB 140706A: Swift detection of a burst with an optical counterpart
- SGR 1935+2154: Swift-BAT observations of additional short soft events
- GRB 140705A / SGR 1935+2154: FTN observations
- GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
- GRB 140705A: KAIT Optical Upper Limit
- GRB 140705A: MITSuME Ishigakijima upper limits
- GRB 140705A: Swift-XRT refined Analysis
- GRB 140705A: MITSuME Okayama upper limits
- GRB 140705A: Swift/UVOT Upper Limits
- GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
- GRB 140705A: Swift detection of a short burst
- GRB 140621A: Suzaku WAM observation of the prompt emission
- GRB 140629A: SAO RAS Rc band photometry
- GRB 140629A, Optical observations
- GRB 140703A: VLA K-band detection
- GRB 140703A: CARMA 3mm detection
- GRB 140703A: P60 observations of a red, slowly-fading afterglow
- GRB 140703A: RATIR Optical and NIR Observations
- GRB 140703A: Fermi GBM detection
- GRB 140703A: Swift-XRT refined Analysis
- GRB 140703A: Swift-BAT refined analysis
- Correction to GCN 16507: GRB 140703A!
- GRB 140703A: MASTER optical observations
- GRB140703A: 10.4m GTC redshift
- GRB 140703A: BOOTES-2 and OSN optical observations
- GRB 140703A: Swift detection of a burst
- GRB 140619C: Suzaku WAM observation of the prompt emission
- GRB 140629A: MITSuME Akeno Optical observation
- GRB 140629A: MASTER-Net preliminary light curve