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"27029 results found.
- GRB 080723, Swift-BAT refined analysis
- GRB 080723A: Swift-XRT refined analysis
- GRB 080723B: Detection and Localization by SuperAGILE
- GRB 080723: Swift detection of a burst
- GRB 080721: UVOT Follow-Up Observations
- Konus-Wind observation of GRB 080721
- GRB 080721: Swift-XRT refined analysis
- GRB 080721, Swift-BAT refined analysis
- GRB 080721: Swift/UVOT Photometric Redshift
- GRB 080721: Swift detection of a burst with a bright optical counterpart.
- Retraction of Swift Trigger 317393
- Trigger 317393: Swift detection of a possible GRB
- Trigger 317205: Swift detection of an outburst from XTE J1701-407
- GRB 080714: GROND confirmation of the optical/NIR afterglow
- Konus-Wind observation of GRB 080714
- GRB 080714: Swift/UVOT Detection of an Optical Afterglow
- GRB 080714: Swift-XRT refined analysis
- GRB 080714: Swift-BAT refined analysis
- GRB 080714: Swift detection of a burst
- GRB 080710: Optical observation with MITSuME Okayama
- GRB 080710, Swift-BAT refined analysis
- GRB 080710: Rapid PROMPT Observations
- GRB 080710: Swift-XRT refined analysis
- GRB080710: Swift/UVOT observations
- UVOT white band observations of GRB080710
- GRB 080710: KAIT OA candidate
- GRB 080710: Swift XRT position
- GRB 080710: Swift detection of a burst
- GRB 080707: possible break in the X-rays
- GRB 080707: GROND Confirmation of the Optical Afterglow
- UVOT observations of GRB080707
- GRB 080707, Swift-BAT refined analysis
- GRB 080707: Swift XRT refined analysis
- GRB 080707: VLT redshift
- GRB 080707: GROND Detection of the Optical Afterglow Candidate
- GRB 080707: Swift detection of a burst
- Refined analysis of Swift Trigger 316063, is IGR J08408-4503
- Trigger 316063: Swift detection of a transient
- GRB 080703: GROND Upper Limits
- GRB 080702B: GROND Upper Limits
- GRB 080703: Swift-XRT refined analysis
- GRB 080703: UVOT Follow-Up Observation
- GRB 080703, Swift-BAT refined analysis
- GRB 080703: Swift detection of a burst with optical afterglow
- GRB 080703A: ROTSE-III Detection of Optical Counterpart
- Swift/UVOT observation of GRB080702A
- GRB 080625: Suzaku WAM observation of the prompt emission
- GRB 080702A: MITSuME Akeno optical upper limits
- GRB 080701A: Early RAPTOR optical limits
- Swift Trigger 315630: Swift/UVOT Upper Limits
- GRB 080702A, Swift-BAT refined analysis
- GRB 080702A: Swift-XRT Team refined analysis
- Swift Trigger 315630: TLS R-band observation
- Swift Trigger 315630: Probably not a GRB
- GRB 080702: Swift detection of a short burst
- GRB 080701A: Swift/UVOT Upper Limits
- GRB 080701A: Early Super-LOTIS Observations
- GRB 080701A, Swift-BAT refined analysis
- Trigger 315630: Swift detection of a possible burst
- GRB 080701: Swift-XRT Prompt Analysis
- GRB 080701: Swift detection of a burst
- GRB 080623: Suzaku WAM observation of the prompt emission
- GRB 080625: Swift/UVOT Follow-Up Observations
- GRB 080625:Swift-XRT detection of the afterglow
- GRB 080625: Swift/UVOT Detection of an Optical Afterglow
- GRB080623: Swift UVOT followup observations
- GRB 080623, Swift-BAT refined analysis
- GRB 080623: TAROT La Silla observatory optical observations
- GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
- GRB 080623: Swift XRT prompt analysis
- GRB 080623: Swift detection of a burst
- Swift trigger 314975 is not a GRB
- Swift-BAT trigger 314975 possible burst
- GRB080613B: MITSuME upper limits
- GRB080613A: Optical upper limits with Okayama MITSuME telescope
- Konus-Wind observation of GRB 080613B
- GRB 080613A: Swift-XRT detection of the afterglow
- GRB080613A: Swift/UVOT Upper Limits
- GRB 080613A: GROND Confirmation of the Afterglow Candidate
- GRB 080613B: GROND Upper Limits
- GRB080613B: Swift/UVOT Upper Limits
- GRB 080613B, Swift-BAT refined analysis
- GRB 080613B: Swift-XRT refined analysis
- GRB 080613B: Swift detection of a burst
- GRB 080613: Faulkes Telescope North optical candidate
- Swift observations of BAT Slew Survey event (Trigger=010)
- Konus-Wind observation of GRB 080607
- GRB080607: RTT150 optical observations
- GRB 080607: Swift-XRT refined analysis
- Swift/UVOT Observations of GRB080607
- GRB 080607 KAIT observations
- Konus-Wind observation of GRB 080605
- GRB 080607, Swift-BAT refined analysis
- GRB 080605: GROND 2nd epoch observations
- GRB 080607: Keck/LRIS spectroscopy and redshift
- GRB 080607: Super-LOTIS early observations
- GRB 080607: Swift detection of a burst with optical afterglow
- GRB 080607: ROTSE-III Detection of Optical Counterpart
- GRB 080605: Swift-UVOT refined analysis
- GRB 080605, Swift-BAT refined analysis