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"43602 results found.
- GRB 150309A: CrAO optic upper limit
- GRB 150309A: ISON-Kislovodsk optic upper limit
- Fermi GBM trigger 150311331 is not a GRB
- GRB 150309A: Swift-BAT refined analysis
- GRB 150309A: Fermi GBM detection
- GRB150309A: Optical observations at Crni Vrh
- GRB 150309A: MASTER prompt optical observation
- GRB 150309A: Swift-XRT refined Analysis
- GRB 150309A : Liverpool Telescope observations
- GRB 150309A: Enhanced Swift-XRT position
- GRB 150309A: BOOTES-1 and -2 upper limit
- GRB 150309A: Swift detection of a burst
- GRB 150305A: a long GRB detected by INTEGRAL
- GRB 150305A: Swift XRT confirms weak INTEGRAL event as a new GRB
- Fermi GBM trigger 150307942 is not a GRB
- Chandra X-ray observations of SWIFT J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka p[PFH2005] 622)
- Swift J0045.2+4151: analysis of XMM-Newton archival data
- Further UVOT Observations of Swift J0045.2+4151
- Fermi GBM trigger 150305751 is not a GRB
- GRB 150301C: VLA Observations
- Further X-ray observations of Swift J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka [PFH2005] 622)
- BAT trigger 633105 (GRB 150301C): NOT r-band upper limit
- GRB 150302A: BOOTES-2/TELMA upper limit
- Trigger 633105 (aka GRB150301C): Swift/UVOT Observations of XRT Counterpart
- GRB 150302A: Mondy optical upper limit
- GRB 150302A, Swift-BAT refined analysis
- GRB 150302A: Swift/UVOT Upper Limits
- GRB 150301C: XRT detection of a potential counterpart of BAT trigger 633105
- GRB 150302A: Swift-XRT refined Analysis
- GRB 150302A: Enhanced Swift-XRT position
- GRB 150301B: Swift-XRT refined Analysis
- GRB 150220A: further Swift-XRT observations
- GRB 150301B: Swift/UVOT Observations
- GRB 150301B: LCOGT-Sutherland observations
- GRB 150302A: KAIT Optical Upper Limit
- GRB 150302A: UVOT Observations
- GRB 150302A: NOT afterglow candidate
- GRB 150302A: Swift detection of a burst
- GRB 150301B: Fermi GBM detection
- GRB 150301B: Swift-BAT refined analysis
- GRB 150301B: X-shooter spectroscopy
- GRB 150301B: GROND afterglow observations
- GRB 150301A: Swift/UVOT Upper Limits
- GRB 150301B: Enhanced Swift-XRT position
- GRB 150301A: Swift-BAT refined analysis
- GRB 150301B: MASTER early OT detection
- GRB 150301A: Swift-XRT refined Analysis
- GRB 150301C : (Swift trigger 633105) Swift observations
- GRB 150301B: Swift detection of a burst with an optical afterglow
- Swift Trigger 633173 is probably not an astrophysical source
- GRB 150301A: GROND Observations
- Trigger 633105 is likely not a GRB
- GRB 150301A: Fermi GBM observation
- GRB 150301A: Swift detection of a short burst or new SGR
- Swift-BAT refined analysis of magnetar 4U 0142+61 (Trigger 632888)
- Fermi GBM Observations of Magnetar 4U 0142+61
- Trigger 632888: Swift detection of the magnetar 4U 0142+61
- GRB 150222A: Further GROND Observations
- GRB 150220A: Fermi GBM observation
- GRB 150220A: Swift-XRT observations
- Konus-Wind observation of GRB 150220A
- IPN Triangulation of GRB 150220A
- GRB 150220A: Swift ToO observations
- GRB 150222A: I-band observations from OSN
- GRB 150222A: Swift-XRT refined Analysis
- GRB 150222B: MAXI/GSC detection
- Fermi GBM Observations of SGR 1935+2154
- GRB 150222A: GROND optical afterglow candidate
- GRB 150222A: Enhanced Swift-XRT position
- GRB 150222A: TNG optical observations
- Fermi GBM trigger 150223068 is not a GRB
- GRB 150222A: Swift-BAT refined analysis
- SGR 1935+2154: Swift-BAT refined analysis
- GRB 150222A: Mondy optical observations
- GRB 150222A: Zadko observatory - Gingin optical observations
- GRB 150222A: MASTER early optical observations
- GRB 150222A: Swift detection of a burst
- Swift detection of an outburst from SGR 1935+2154
- GRB 150213B, the review of the sky area in plate archives
- Trigger 631946: Swift detection of H1745-203
- Fermi GBM trigger 150220229 is not a GRB
- GRB 150219A: Fermi GBM observation
- GRB 150219A: Swift-XRT afterglow detection
- Trigger 631747: Swift detection of 4U 0614+09
- GRB 150213B: AAO photometry
- GRB 150219A: Swift ToO observations
- GRB 150219A: A long GRB detected by INTEGRAL
- GRB 150213B: Enhanced Swift-XRT position
- GRB 150213B: P60 Observations
- GRB 150212A, the review of the sky area in plate archives
- GRB 150213B: Swift/UVOT Detection
- GRB 150213B: Swift-BAT refined analysis
- GRB 150213B: RATIR Optical and NIR Observations
- GRB 150213B: Swift-XRT refined Analysis
- GRB 150213B: AAO optical observations
- GRB 150213B: optical detection from the NOT
- GRB 150212A: Swift/UVOT Observations
- GRB 150213B: Tautenburg Afterglow Detection
- GRB 150213B: Swift detection of a burst with an optical afterglow
- GRB 150213A: Fermi GBM detection