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"36180 results found.
- GRB 080319C: KAIT OA observations
- GRB 080320 - SDSS Pre-Burst Observations
- GRB 080320: Swift detection of a burst
- GRB 080320: ROTSE-III Optical Limits
- GRB 080319B : Lulin observation of temporal break at 0.2 days
- GRB 080319B: ROTSE-III Observations of Optical Counterpart
- GRB 080319B: optical observations
- 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: RAPTOR observations of a naked eye burst
- GRB 080319A: Swift-XRT Team Refined Analysis
- GRB 080319B, Swift-BAT refined analysis
- GRB080319B: Prompt PROMPT Detections
- GRB 080319C: Swift-XRT Team Refined Analysis
- GRB 080319B: Swift-XRT Team Refined Analysis
- GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
- GRB 080319C: AGILE-MCAL observation of the prompt emission
- GRB 080319B: Hobby-Eberly Telescope Spectroscopy
- GRB 080319D: MASTER-VWF-Kislovodsk optical observation
- GRB 080319C: MASTER-VWF-Kislovodsk optical observation
- GRB 080319D: Swift detection of a burst with a possible optical afterglow
- GRB 080319B: TORTORA synchronous observation
- VLT/UVES redshift of GRB 080319B from FeII fine-structure lines
- GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
- GRB 080319B: Enhanced Swift-XRT position
- GRB 080319A: Enhanced Swift-XRT position
- GRB 080319A, Swift-BAT refined analysis
- GRB 080319B: REM early data
- GRB 080319b light curve by Pi-of-the-Sky
- VLT/UVES redshift of GRB 080319B
- GRB 080319C: Early Super-LOTIS Observations
- GRB 080319C: Swift detection of a burst with an optical afterglow
- GRB 080319C: KAIT OA candidate
- GRB 080319A: REM observations
- GRB 080319b prompt optical observation by Pi-of-the-Sky
- GRB 080319B: Change in power law decay index
- GRB 080319B: Gemini-South Spectroscopy
- GRB 080319A: optical observations at the NOT
- GRB0 080319B : LOAO optical observation
- GRB 080319b: Early IR Imaging from PAIRITEL
- GRB080319B Liverpool Telescope optical afterglow candidate
- GRB 080319B: Super-LOTIS Detection of a Bright OT
- GRB 080319B: REM observations
- GRB 080319B: KAIT OA
- GRB 080319B: UVOT Position
- 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
- GRB080310, LBT and MDM photometry
- GRB080315: Bok Optical Observations
- Swift/UVOT observations of GRB 080315
- Swift trigger 306323: Swift-BAT/XRT refined analysis
- GRB 080315: Optical observations
- GRB 080315: TAROT Calern observatory optical observations
- GRB 080315: Swift detection of a possible burst
- GRB080310 : Lulin Optical observations
- GRB080310, unusual slow decay in the optical
- GRB 080310: GAO 150cm telescope Optical Observation
- GRB 080310: ROTSE-III Observations of Optical Counterpart
- GRB080310: Optical observation by MITSuME telescope
- GRB080310, optical observations with the LBT
- GRB 080307: GAO 150cm telescope Optical Observation
- GRB 080229A: GAO 150cm telescope Optical Observation
- GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
- GRB 080307: NIR upper limit
- GRB 080229: NIR upper limit
- GRB 080310: early RAPTOR multicolor observations
- GRB 080310, Swift-BAT refined analysis
- GRB080210: optical observations
- GRB080307: optical upper limit
- GRB 080310: Swift-XRT refined analysis
- GRB 080310: Swift/UVOT Refined Analysis
- GRB 080310: Redshift from Keck/DEIMOS Spectra
- GRB 080310 - SDSS Pre-Burst Observations
- GRB 080310: Enhanced Swift-XRT position
- GRB 080310: RRM optical photometry with the VLT
- GRB080310, detection of break in optical
- GRB 080310: VLT/UVES spectroscopy
- GRB080310, optical observations with LBT
- GRB 080310: Magellan redshift revision
- GRB 080310: Lick/Kast Spectroscopy
- GRB080310: Super-LOTIS suggestion of brightening
- GRB 080310, SMARTS optical/IR afterglow observations
- GRB 080310: REM observations
- GRB 080310: Magellan redshift
- GRB 080310 afterglow candidate (correction to UT time)
- GRB 080310: Swift detection of a burst with optical afterglow
- GRB 080310 afterglow candidate
- GRB 080307: Swift-XRT Team refined analysis
- GRB 080307: Swift/UVOT Upper Limits
- GRB 080307: Early RAPTOR Limits
- GRB 080307, Swift-BAT refined analysis
- GRB080307 - SDSS Pre-Burst Observations
- GRB 080307: TNT optical observation
- GRB080307: Optical upper limits
- GRB 080307: Gemini-N i-band observations - candidate afterglow
- GRB 080307: BOAO imaging - retraction and new limit