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"23093 results found.
- GRB 080430: Spectroscopy from CAHA
- GRB 080430 - SDSS Pre-Burst Observations
- GRB 080430: Bootes observation
- GRB 080430: Swift detection of a burst with optical afterglow
- GRB 080430: TAROT Calern observatory optical observations
- GRB 080426, Swift-BAT refined analysis
- GRB 080426: Swift detection of a possibly short burst
- GRB080319A: MAGIC telescope GeV observation
- GRB 080420?: Swift detection of a possible short burst
- GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
- GRB 080413B: Rapid PROMPT Observations
- Swift XRT and UVOT observations of GRB080414
- GRB 080413B: Faulkes Telescope South optical afterglow observations
- GRB 080413A: Suzaku WAM observation of the prompt emission
- GRB 080413B: Suzaku WAM observation of the prompt emission
- GRB 080414: RTT150 optical observations
- GRB 080414: A long GRB detected by INTEGRAL
- IBAS Alert n. 5257 : not a GRB
- GRB080413B
- Swift-BAT spectral lag analysis of GRB 080413B
- GRB 080413B: Swift XRT refined analysis
- GRB 080413B, Swift-BAT refined analysis
- GRB 080413A, Swift-BAT refined analysis
- GRB 080413A Bootes observation
- GRB 080413A: VLT/UVES redshift
- GRB 080413B: VLT redshift
- GRB 080413B: Swift detection of a possibly short burst with optical counterpart
- GRB 080413: TAROT Calern observatory optical observations
- GRB 080413: Swift detection of a burst with an optical afterglow
- GRB 080411, Swift-BAT refined analysis
- GRB 080411: VLT redshift
- GRB080330: MAGIC telescope GeV observation
- GRB 080411: Swift detection of a bright burst
- GRB 080409: Swift-BAT refined analysis
- GRB 080330 optical observations
- GRB 080409: Swift detection of a burst
- GRB 080408: Analysis of AGILE Gamma-ray data
- GRB 080408: GRB Localization by SuperAGILE
- GRB 080405: Swift-BAT refined analysis
- GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
- GRB 080325: optical upper limit
- GRB 080330: Prompt PROMPT Observations
- GRB080330: optical observations
- GRB080330: optical observations
- GRB 080328: Suzaku WAM observation of the prompt emission
- GRB 080330, Swift-BAT refined analysis
- Konus-Wind observation of GRB 080328
- GRB080330: LOAO R-band Detection
- GRB 080330: NOT redshift
- GRB 080330: TAROT Calern observatory optical observations
- GRB080330 - SDSS Pre-Burst Observations
- GRB 080330: Liverpool Telescope Optical observations
- GRB 080330: Swift detection of a burst with an optical counterpart
- GRB 080330: TAROT Calern observatory optical detection
- GRB 080328: BTA optical imaging and spectroscopy
- GRB 080328, Swift-BAT refined analysis
- GRB 080328: Swift XRT refined analysis
- GRB 080325, Swift-BAT refined analysis
- Swift/UVOT observations of GRB080328
- GRB080325 - I and z-band Imaging
- GRB080328: Faulkes Telescope North observations
- GRB 080328: Swift detection of a burst with an optical counterpart
- GRB 080325: Subaru detection of NIR afterglow candidate
- GRB 080325: GROND Observations
- GRB 080325: Swift detection of a burst
- GRB 080319B: Spitzer Mid-infrared Observations
- GRB 080319C: Suzaku WAM observation of the prompt emission
- GRB 080320, Swift-BAT refined analysis
- GRB 080319B: TORTORA light curve
- GRB 080319D, Swift-BAT refined analysis
- GRB 080320: Early Super-LOTIS Observations
- Konus-Wind observation of GRB 080319C
- GRB 080319B optical observations
- GRB 080319C, Swift-BAT refined analysis
- GRB 080320 - SDSS Pre-Burst Observations
- GRB 080320: Swift detection of a burst
- GRB 080319B : Lulin observation of temporal break at 0.2 days
- GRB 080319C - SDSS Pre-Burst Observations
- GRB 080319A SDSS Pre-Burst Observations
- Swift-BAT trigger 306829 is IGR J16479-4514
- GRB080319B - SDSS Pre-Burst Observations
- GRB 080319B, Swift-BAT refined analysis
- GRB080319B: Prompt PROMPT Detections
- GRB 080319C: AGILE-MCAL observation of the prompt emission
- GRB 080319D: Swift detection of a burst with a possible optical afterglow
- GRB 080319B: TORTORA synchronous observation
- GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
- GRB 080319A, Swift-BAT refined analysis
- GRB 080319b light curve by Pi-of-the-Sky
- GRB 080319C: Early Super-LOTIS Observations
- GRB 080319C: Swift detection of a burst with an optical afterglow
- GRB 080319b prompt optical observation by Pi-of-the-Sky
- GRB 080319A: optical observations at the NOT
- GRB0 080319B : LOAO optical observation
- GRB080319B Liverpool Telescope optical afterglow candidate
- GRB 080319B: Super-LOTIS Detection of a Bright OT
- GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
- GRB 080319A: Swift detection of a burst
- Swift Trigger 306745 is not a GRB
- Swift Trigger 306616 is not a GRB