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"11841 results found.
- GRB 110625A: ROTSE-III Optical Limits
- SGR 1E 1841-045: Swift-BAT refined analysis
- GRB 110604A: final update on Swift-XRT observations
- SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
- Konus-Wind observation of GRB 110618A
- GRB 110610A: MASTER-NET optical observations
- Konus-Wind observation of GRB 110604A
- GRB 110530A: Swift-XRT refined Analysis
- GRB 110530A: MASTER OT observations
- GRB 110530A: Swift detection of a burst with an optical afterglow
- Konus-Wind observation of GRB 110529A
- Swift J1644+57/GRB 110328A, Additional HST Observations
- GRB 110521A: MASTER prompt optical limit
- GRB 110521A: Swift-XRT refined analysis
- GRB 110521A: Swift detection of a burst
- GRB 110520A: Swift-XRT refined Analysis
- GRB 110520A: WHT IR observations
- GRB 110520A - NOT optical observation
- GRB 110520A: MASTER-NET optical observations
- GRB 110520A: Swift detection of a burst
- Konus-Wind observation of GRB 110518A
- IPN localization of bright GRB 110518A
- GRB 110519A: Swift detection of a burst
- Konus-Wind observation of GRB 110503A
- GRB 110422A: MASTER first 30 min OT light curve
- GRB 110503A: SARA-N Observations and Photometric Calibration
- GRB 110503A: Swift/UVOT Observations
- GRB 110503A: Swift-XRT refined Analysis
- GRB 110503A: Swift-BAT refined analysis
- GRB 110428A: Suzaku WAM observation of the prompt emission
- GRB 110422A: optical observations in CrAO
- Konus-Wind observation of GRB 110428A
- GRB 110428A: Fermi-LAT Detection
- GRB 110426A: MAXI/GSC detection of a GRB
- GRB 110422A: optical observations in CrAO
- Konus-Wind observation of GRB 110422A
- GRB 110422A: Swift-XRT refined Analysis
- GRB 110422A: THO optical observations
- GRB 110420B: Fermi GBM observation
- Konus-Wind observation of GRB 110420A
- GRB 110420B, GROND observations
- GRB 110420B: Swift-XRT afterglow candidate
- GRB 110420A: Swift-XRT refined Analysis
- GRB 110420A: Swift detection of a burst with optical counterpart
- GRB 110414A: Swift-BAT Refined Analysis
- GRB 110412A: Swift-BAT refined analysis
- GRB 110411A: Swift-XRT refined Analysis
- GRB 110411A: MASTER prompt and follow-up optical limits
- GRB 110412A: Swift detection of a burst
- GRB 110411A: Swift detection of a burst
- GRB 110407A: Swift-XRT refined Analysis
- GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
- GRB 110406A: Positional coincidence with NGC 404
- GRB 110407A: Swift detection of a burst
- Konus-Wind observation of GRB 110406A
- ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
- GRB 110328A / Swift J164449.3+573451: millimeter detection at PdBI
- GRB 110402A: Konus-Wind spectral lags and detailed energetics
- GRB 110328A/Swift J164449.3+573451: SARA-N detection
- Konus-Wind observation of GRB 110402A
- GRB 110402A: Swift-XRT refined Analysis
- GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
- GRB 110402A: Swift detection of a burst
- GRB 110328A / Swift J164449.3+573451: KASINICS NIR Observation
- GRB 110328A / Swift J164449.3+573451: Radio-optical/NIR Astrometry
- GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
- GRB 110328B: Fermi-LAT Detection
- GRB 110328A/ Swift J164449.3+573451 : Xinglong TNT Upper limit
- GRB 110328A: Swift detection of a burst
- GRB 110319B BAT refined analysis
- GRB 110319B: GROND upper limits
- GRB 110319B found in ground analysis of Swift-BAT data
- GRB 110319A: Swift-XRT refined Analysis
- GRB 110319A: Swift detection of a burst
- GRB 110318A: Swift detection of a burst
- GRB 110315A: Swift detection of a burst
- GRB 110312A: RTT150 optical observations
- GRB 110312A: Swift-XRT refined Analysis
- GRB 110312A: Swift detection of a burst
- GRB 110223A : early optical limit by "Pi of the Sky"
- GRB 110223A: Liverpool Telescope observations
- GRB 110223A: Swift-XRT refined Analysis
- GRB 110223B: Swift-BAT refined analysis
- GRB 110223A: Swift detection of a burst
- OT 110215: Further NIR observations from NOT of the GRB candidate
- Fermi GBM detection of an SGR-like burst
- Swift XRT and UVOT Observations of OT 110215
- OT 110215: NIR observations from NOT of GRB candidate
- GRB 110213A: optical observations in CrAO
- OT 110215: possible GRB from 2MASS J00264184+8324093
- GRB 110213B: Gemini South Redshift
- GRB 110213A: YNAO-GMG Observations
- Konus-Wind observation of GRB 110213A
- Konus-Wind observation of GRB 110213B
- GRB 110213B: MAXI/GSC refined analysis
- GRB 110213B: MAXI/GSC detection of a probable GRB
- GRB 110213A: GRAS011 optical observations
- GRB 110212A: GRT Optical Observation
- GRB 110212A: SARA-N Optical Limits
- GRB 110201A: Subaru/MOIRCS Ks-band photometry