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"28871 results found.
- GRB050716: Faulkes North Telescope observation
- Swift/BAT detection of GRB 050716
- GRB050715: Refined analysis of the Swift-BAT burst
- GRB 050715: Swift-BAT detection
- Swift UVOT Observations of GRB 050714B
- Konus-Wind observation of GRB 050713A
- GRB 050714B: refined XRT analysis
- GRB050714B: Refined analysis of the Swift-BAT burst
- Swift detection of a long transient (GRB 050714B?)
- GRB 050714A: ROTSE-III Optical Limits
- GRB 050713A: XRT refined analysis
- GRB 050713A: RAPTOR detection of early optical emission
- GRB050713B :Swift/UVOT observations
- GRB050713b: XRT refined analysis
- GRB 050713B: Swift-BAT Refined Analysis
- Swift-BAT Trigger 145729 is not a GRB
- GRB 050713A: Swift/UVOT observation
- GRB 050713A : Swift-BAT Refined Analysis
- GRB050713B: Faulkes North Telescope observation
- RBO RI observations of GRB 050713A
- GRB 050713B
- GRB 050713: Swift detection of Bright Burst
- GRB 050713A: ROTSE-III Optical Limits
- GRB 050712: Swift-BAT Refined Analysis
- GRB050712: UVOT candidate optical counterpart
- GRB 050712: Swift XRT afterglow position
- GRB 050712: Swift detection of a weak burst
- GRB050709: A Possible Short-Hard GRB Localized by HETE
- GRB 050701
- GRB 050701, optical observations
- GRB 050701: Refined XRT analysis
- Swift UVOT observations of GRB 050701
- GRB050701: Swift-BAT Refined analysis
- Swift trigger 143708 is really GRB 050701
- GRB 050525A: Swift Late-Time Decay Rate
- CORRECTION: GRB050603 Swift UVOT Afterglow Observations
- XRF 050509c: Optical monitoring
- Konus-Wind observation of an intermediate burst from SGR 1806-20
- GRB 050607 optical decay
- Swift/UVOT observations of GRB050607
- GRB 050607: RAPTOR-S Early Optical Limits
- GRB 050607: MDM Observations
- GRB050607,optical observation
- GRB 050607 - XRT refined data analysis
- GRB050607 optical limit by "Pi of the Sky"
- GRB050607: Swift Detection of a long GRB
- GRB 050603: prediction of t_break
- Konus-Wind observation of GRB 050603
- GRB050603: Fading Afterglow observed by Swift UVOT
- GRB 050603: Swift XRT Position
- GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
- Swift/BAT Detection of GRB050603
- GRB 050408: jet break in the XRT light curve
- GRB050528, XRT observations
- Swift-BAT GRB 050528: a soft burst
- Update on Swift-BAT GRB 050528 (Trigger 130679)
- GRB050528: BOOTES optical candidate (retraction)
- GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
- GRB050528: BOOTES optical candidate
- Possible GRB050528: no candidate from Liverpool Telescope
- Swift-BAT detection of possible GRB 050528
- GRB 050525B: Swift-BAT observations
- GRB050525A,optical observation
- GRB050525: Super-LOTIS observations
- GRB 050525A: Swift-BAT refined analysis
- Swift/UVOT UV and optical detections of GRB 050525
- Konus-Wind observation of GRB 050525
- GRB 050525 - Very Bright, Not Short
- GRB 050525: Swift Detection of a Bright, Possibly Short Burst
- GRB 050525A: ROTSE-III Detection of Possible Counterpart
- GRB 050509A: Further I-band imaging
- GRB050522,optical observation
- GRB050520,optical observation
- GRB 050520: VLT/ULTRACAM observations
- GRB 050520: BART optical limit
- No Swift-BAT Lightcurves in real-time for next 3 weeks
- Swift-BAT trigger 122203 is not a real GRB
- XRF 050509C: REM NIR and Optical refined analysis
- XRF 050509c optical afterglow
- GRB050509b, SDSS pre-burst observations
- GRB 050509b: RAPTOR deep, early limits.
- GRB 050509b: Swift/UVOT follow-up measurements
- GRB050509B: Optical observations at the Very Large Telescope
- GRB050416: Afterglow detection at 188 nm with Swift UVOT
- GRB 050509a: Swift-BAT refined analysis
- GRB 050509c: ROTSE-III Optical Limits
- GRB050509c (=H3751): An X-Ray Flash Localized By HETE
- GRB050509c: REM NIR and Optical observations
- Swift UVOT Follow-up Observations of GRB 050509B
- GRB 050509B: Swift/XRT refined analysis
- GRB050509a: Swift UVOT observations
- GRB 050509b: Optical observations
- GRB 050509A: Optical observations
- GRB 050509b: Swift-BAT refined analysis of the short hard burst
- GRB 050509B: ROTSE-III Optical Limits
- Swift Detection of GRB050509b: A short duration burst
- Swift Detection of the Burst GRB050509
- Swift-BAT detection of GRB 050507
- GRB050505: Infrared observations
- GRB 050505: Further Swift UVOT observations.