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"42587 results found.
- GRB 130603B: Enhanced Swift-XRT position
- Swift/UVOT observations of GRB130603A
- GRB 130603A: Enhanced Swift-XRT position
- GRB 130603A: Swift-BAT refined analysis
- GRB 130603B: Swift detection of a bright short burst
- GRB 130603A: Swift-XRT observations
- GRB 130603A: Swift-XRT and Swift-UVOT detections
- GRB 130603A: Swift detection of a burst
- GRB 130529A: GROND upper limits
- GRB 130528A: Fermi GBM detection
- GRB 130527A: Suzaku WAM observation of the prompt emission
- GRB 130529A: Swift-BAT refined analysis
- GRB 130518A: Suzaku WAM observation of the prompt emission
- GRB 130529A: Swift-XRT refined Analysis
- GRB 130529A: Enhanced Swift-XRT position
- Konus-Wind observation of GRB 130528A
- Konus-Wind observation of GRB 130527A
- GRB 130529A: Prompt enhanced Swift-XRT position
- GRB 130528A: Swift-BAT refined analysis
- GRB 130529A: Swift detection of a burst
- GRB 130528A: Swift-XRT refined Analysis
- GRB 130528A: Enhanced Swift-XRT position
- GRB 130521A: Skynet/PROMPT detection of an extremely red afterglow
- GRB 130528A: optical upper limit
- GRB 130528A: Swift detection of a burst
- GRB 130527A: NOT optical counterpart
- GRB 130527A: RATIR Optical and NIR Observations
- GRB 130527A: Swift-BAT refined analysis
- GRB 130527A: Swift-XRT refined Analysis
- GRB 130527A: BOOTES-2 & 3.5m CAHA opt/nIR observations
- GRB 130527A: Enhanced Swift-XRT position
- GRB 130527A: Prompt enhanced Swift-XRT position
- GRB 130527A: Swift detection of a bright burst
- GRB 130514A: Konus-Wind and Swift/BAT joint spectral analysis
- Swift Trigger 556533 is not an astrophysical event
- GRB 130521B: Suzaku WAM observation of the prompt emission
- Swift Trigger 556533 is probably not an astrophysical event
- Konus-Wind observation of GRB 130521B
- GRB 130521A: Skynet/PROMPT observations
- IPN Triangulation of GRB 130521B
- GRB 130514B: Further Swift-XRT Observations
- GRB 130518B, Swift-BAT refined analysis
- GRB 130521A, Swift-BAT refined analysis
- GRB 130521A: TAROT La Silla observatory optical observations
- GRB 130521A: Swift detection of a burst
- Swift XRT observation of GRB 130518B
- GRB 130518A: mm detection at PdBI
- GRB 130515A: Suzaku WAM observation of the prompt emission
- GRB 130518A: Gemini Redshift confirmation
- GRB 130427A / SN 2013cq: Hubble Space Telescope Observations
- GRB 130518A: 10.4m GTC/OSIRIS redshift
- GRB 130518A: Continued RATIR Optical Observations - Fading
- Correction to GCN Circular 14682 (GRB 130518B)
- GRB 130518B found in ground analysis of Swift-BAT data
- GRB 130518A: Confirmation of the X-ray afterglow.
- GRB 130518A: P60 Afterglow Observations
- GRB 130518A: RATIR Optical and NIR Observations
- GRB 130518A: Swift XRT and UVOT possible afterglow
- Konus-Wind observation of GRB 130518A
- GRB 130518A Swift-BAT position from ground analysis
- GRB 130518A: Fermi LAT detection
- GRB 130518A: Fermi GBM detection
- VLT observations of GRB 130427A
- GRB 130427A: Konkoly optical observations
- GRB 130515A: IRSF NIR Observation
- GRB 130515A: Further Gemini Observations
- GRB 130427A:: BTA spectroscopic observations on May 10/11.
- Konus-Wind observation of GRB 130515A
- GRB 130515A: FORS2 spectroscopy of candidate counterpart
- GRB 130427A: Continued RATIR Optical and NIR Observations - Photometric Evidence for a New Component
- GRB 130514B: RATIR Optical and NIR Observations
- Fermi GBM trigger 390275038 / 130515072 is not a GRB
- GRB 130515A: Fermi GBM detection
- GRB 130427A: Skynet detections of a possible supernova
- GRB 130515A: Swift-XRT refined Analysis
- GRB 130515A: Swift/UVOT Upper Limits
- GRB 130514B Swift-BAT observations
- GRB 130515A: Swift-BAT refined analysis
- GRB 130514B: GROND observations
- GRB 130515A: Gemini/GMOS Observations
- GRB 130515A: GROND Observations
- GRB 130515A: Enhanced Swift-XRT position
- GRB 130515A: VLT acquisition observation
- GRB 130511A: SSO 2.3m observation
- GRB 130514B: Swift-XRT Observations
- GRB 130515A: Swift detection of a short burst
- GRB 130514A: Swift-XRT refined Analysis
- GRB 130514A: Skynet/PROMPT/DSO Detections
- GRB 130427A: Spectroscopic detection of the SN from the 10.4m GTC
- GRB 130427A: optical observations
- GRB130514B: MASTER-Net optical observations.
- GRB 130514A: RATIR Optical and NIR Observations
- GRB 130513A: RATIR Optical and NIR Observations
- GRB 130514A: Swift/UVOT Upper Limits
- GRB 130513A: GROND observations
- GRB 130514B: a long GRB detected by INTEGRAL
- GRB 130514A: Enhanced Swift-XRT position
- GRB 130514A: Swift-BAT refined analysis
- GRB 130513A: Swift-XRT detection of the afterglow.
- GRB 130514A: GROND optical-NIR afterglow discovery and photo-z