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"19533 results found.
- GRB 140606A: Swift detection of a short hard burst
- Swift Trigger 600914 is probably a noise fluctuation
- Swift XRT is off-line
- GRB 140523A: further Swift-XRT observations
- GRB 140529A BAT refined analysis
- GRB 140529A: Swift/UVOT Upper Limits
- GRB 140529A: Swift-XRT afterglow detection.
- GRB 140408A: Withdrawal of afterglow candidate
- GRB 140529A found in ground analysis of BAT slew data
- Swift Trigger 600114 in M31: UVOT Observations
- Swift trigger 600114 is not an outbursting X-ray source
- Swift Trigger 600114: Optical spectroscopy from GTC
- Swift Trigger 600114: Preliminary BAT analysis
- Swift Trigger 600114 in M31: Archival and Prompt UVOT Imaging
- Swift detection of a bright X-ray source in M31
- Swift detection of SFXT IGR J17544-2619
- GRB 140523A: NOT observation
- IPN Triangulation of GRB 140523A
- Swift trigger 599860 probably not real
- GRB 140523A: possible X-ray afterglow candidate from tiled Swift/XRT observations
- GRB 140523A Tiled Swift observations
- GRB 140523A: Fermi-LAT detection
- GRB 140521A: Fermi GBM Detection
- GRB 140423A: TShAO optical observations
- GRB 140521A: AAO optical observations
- GRB 140521A: Swift-BAT refined analysis
- GRB 140521A: AROMA-N Optical Observation
- GRB 140516A: further Swift-XRT analysis
- GRB 140521A: MASTER optical observations
- GRB 140521A: Swift detection of a burst
- GRB 140518A: T100 observations
- GRB 140512A: MASTER prompt and afterglow optical observations
- GRB 140518A, Swift-BAT refined analysis
- GRB 140518A: Swift-XRT refined Analysis
- GRB 140518A: Skynet GORT Detections of the Optical Afterglow
- GRB 140518A: Swift/UVOT Upper Limits
- GRB 140518A: RATIR Optical and NIR Observations
- GRB 140518A: P60 i-/z-band detections
- GRB 140518A: KAIT optical candidate
- GRB 140518A: Swift detection of a burst
- GRB 140516A: RATIR Optical and NIR Observations
- GRB 140516A: Swift/UVOT Upper Limits
- GRB 140516A: Swift-BAT refined analysis
- GRB 140516A: Swift-XRT refined Analysis
- GRB 140516A: Enhanced Swift-XRT position
- GRB 140516A: MASTER early optical observations
- GRB 140516A: Swift detection of a short burst
- GRB 140515A: Swift-BAT refined analysis
- GRB 140419A: Continued Mondy optical observations
- GRB 140515A: GROND observation of the afterglow
- GRB 140515A: Swift-XRT refined Analysis
- GRB 140515A: KAIT Optical Upper Limit
- GRB 140515A: Swift/UVOT Upper Limits
- GRB 140423A: HCT optical observations
- GRB 140515A: Enhanced Swift-XRT position
- Trigger 599041: Swift detection of SFXT IGR J16479-4514
- GRB 140515A: Swift detection of a burst
- Konus-Wind observation of GRB 140512A
- GRB 140423A: AAO optical upper limits
- GRB 140512A: Continued UVOT Observations
- GRB 140512A: Fermi GBM detection
- GRB 140508A: Mondy upper limit
- GRB 140512A: Swift-BAT refined analysis
- GRB 140512A: Swift-XRT refined Analysis
- GRB 140512A: Enhanced Swift-XRT position
- Swift Observations of GRB 140508A
- GRB 140428A: GROND afterglow confirmation
- GRB 140512A: Swift detection of a burst with an optical counterpart
- GRB 140512A: MASTER optical observations
- GRB 140423A: Mondy optical observations
- Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
- GRB 140508A: Swift/UVOT Detection
- GRB 140509A: Swift/UVOT Detection and photo-z
- GRB 140509A: Swift-BAT refined analysis
- VHE gamma-ray observations by MAGIC of SWIFT Trigger 596958
- GRB 140509A: Swift-XRT refined Analysis
- GRB 140509A: Enhanced Swift-XRT position
- GRB 140508A: Swift-XRT observations
- GRB 140509A: Swift detection of a burst with an optical counterpart
- GRB 140508A: iPTF optical transient candidate
- IPN triangulation of GRB 140508A
- Konus-Wind observation of GRB 140506A
- GRB 140502A: ISON-NM early optical limit
- GRB 140506A: Fermi GBM Detection
- GRB 140506A: Swift/UVOT Detection
- GRB 140506A: Swift-BAT refined analysis
- GRB 140506A: Swift-XRT refined Analysis
- GRB 140506A: Enhanced Swift-XRT position
- GRB 140506A: Swift detection of a burst with an optical counterpart
- Konus-Wind observation of GRB 140423A
- GRB 140430A: iTelescope.Net T16 Optical Observation
- GRB 140502A: Swift/UVOT Upper Limits
- GRB 140502A: Swift-BAT refined analysis
- GRB 140502A: Swift-XRT refined Analysis
- GRB 140502A: Enhanced Swift-XRT position
- Swift Trigger 597860 is probably not a GRB
- GRB 140502A: Fermi GBM observation
- GRB 140502A: Swift detection of a burst
- GRB 140430A: Swift-BAT refined analysis
- GRB 140430A: Swift/UVOT Observations