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"25643 results found.
- GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
- Swift/UVOT observations of GRB070721B optical afterglow.
- GRB 070721B, Further Swift-BAT refined analysis
- Swift/UVOT Observations of GRB070721A
- GRB 070721B : Faulkes Telescope South observations
- GRB 070721B: Swift-XRT refined analysis
- GRB 070721A : Faulkes Telescope South optical limit
- GRB 070721A: Swift/XRT refined analysis
- GRB 070721B, Swift-BAT refined analysis
- GRB 070721A, Swift-BAT refined analysis
- GRB070721B: A bright UVOT candidate
- GRB 070721B: Swift detection of a burst
- GRB 070721: Swift detection of a possible burst
- GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
- GRB 070714B : Suzaku WAM observation of the prompt emission
- GRB 070714A: Swift-BAT T_zero
- GRB 070714A: Swift/UVOT Upper limits
- GRB 070714B: Swift/UVOT Upper Limits
- GRB 070714B: Swift-BAT spectral lag for the SHB
- GRB 070714A: Swift XRT refined analysis
- GRB070714B: Swift-XRT refined analysis
- GRB 070707: Swift-XRT follow-up observations
- GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
- GRB 070714B, Swift-BAT refined analysis of the short hard burst
- GRB 070714A, Swift-BAT refined analysis
- GRB 070714 : Liverpool Telescope optical counterpart ?
- GRB 070714: Swift detection of a bright burst, possibly short
- Swift detection of a possible burst (Trigger 284850)
- GRB 070704: RTT150 optical observations
- GRB 070704: Suzaku/WAM observation of the prompt emission
- Swift/UVOT Observations of GRB070707
- Swift XRT observation of GRB 070707
- GRB 070707: VLT observations
- GRB 070429B: NIR Observations
- GRB070704: FAVOR optical observations
- GRB 070704 : Liverpool Telescope Observations
- GRB 070704: Swift-XRT refined analysis
- Swift/UVOT Observations of GRB070704
- GRB 070704, Swift-BAT refined analysis
- GRB 070704: Correction to GCN Circ 6594
- GRB 070704: Swift detection of a burst
- GRB 070626: Suzaku/WAM observation of the prompt emission
- GRB 070628 Swift-UVOT Refined Analysis
- GRB 070628: NIR detection of afterglow
- GRB 070628, Swift-BAT refined analysis
- GRB 070628: TAROT La Silla observatory optical observations
- GRB 070628: Swift XRT refined analysis
- GRB 070628: Watcher Observations
- Swift UVOT Observations of GRB 070628
- GRB 070628: Swift detection of a possible burst
- INTEGRAL burst GRB070615: X-ray continued observations
- GRB 070616 : WIDGET simultaneous optical observations
- GRB 070616: Suzaku/WAM observation of the prompt emission
- GRB 070621: Swift/UVOT Upper Limits
- Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
- GRB 070621: Swift-BAT refined analysis
- GRB070621: Swift XRT refined analysis
- GRB070621: OPTIMA-Burst optical upper limit
- GRB 070621: TAROT Calern observatory optical observations
- GRB 070621: Watcher Observations
- GRB 070621: ROTSE-III Prompt Optical Limits
- GRB 070621: Swift detection of a burst
- Swift/UVOT detection of GRB070616 optical afterglow.
- GRB070616: Optical Observation by MITSuME Akeno
- GRB 070612B: Optical Observation by MITSuME Akeno
- GRB 070616, Swift-BAT further refined analysis
- GRB 070616: Swift XRT refined circular
- Swift/UVOT observations of GRB070616
- GRB 070616: TLS observation
- Swift XRT observations of the INTEGRAL burst GRB070615: Possible
- GRB 070616, Swift-BAT partial refined analysis
- GRB 070616: Swift detection of a burst
- UVOT Observations of INTEGRAL burst GRB070615
- GRB 070615
- GRB 070612A: Super-LOTIS observations
- GRB 070612A: Suzaku/WAM observation of the prompt emission
- GRB 070612A: continued SARA observations
- GRB 070612A: spectral lag
- GRB 070611: Watcher Observations
- Swift Trigger 282176 is Cygnus X-1
- GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
- GRB 070612B: SARA upper limit
- GRB 070612B, Swift-BAT refined analysis
- GRB 070612A, Swift-BAT refined analysis
- SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
- GRB 070612B: Swift/UVOT upper limits
- GRB 070612B: FRAM limit
- GRB 070612B: KAIT limits
- GRB 070612A: SARA detection of possible OT
- GRB 070612B: Swift XRT position from downlink data
- GRB 070610: TAROT Calern observatory optical observations
- GRB 070612B: Swift detection of a burst
- GRB 070612: Swift detection of a burst
- GRB 070610: SARA upper limit
- GRB 070610: Swift-XRT refined analysis
- GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
- GRB 070611: Swift/UVOT Observations
- GRB 070611, Swift-BAT refined analysis
- GRB 070610: Watcher Observations
- GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart