GCN Circulars
GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"5862 results found.
- GRB 150424A: Keck detection of optical afterglow
- GRB 150424A: Swift detection of a short burst
- Swift trigger 638589 is probably not an astrophysical source
- GRB 150418A: MAXI/GSC detection
- Swift detection of SAX J1808.4-3658
- Swift triggered on a source in Terzan 5 (trigger=637212)
- GRB 150323C: CrAO optical observations
- GRB 150323C: additional optical observations in Mondy
- GRB 150403A: Swift detection of a burst with an optical counterpart
- GRB 150317A: likely host galaxy detection
- GRB 150323C: MITSuME Akeno Optical observation
- GRB 150220A: Optical observations at Kyiv comet station
- Konus-Wind observation of GRB 150323B
- GRB 150323C: Mondy optical observations
- GRB 150323C, Swift-BAT refined analysis
- GRB 150323B: Fermi GBM observation
- GRB 150323C: MASTER-net optical observation
- GRB 150323B detected in ground analysis of Swift-BAT data
- Swift Triggers 635788-635794 are probably not real.
- GRB 150318A: Skynet PROMPT-CTIO Observations
- GRB 150220A, the review of the sky area in plate archives
- GRB 150314A: P60 observations
- GRB 150313A: MAXI/GSC detection
- GRB 150222A: CrAO optical observation
- GRB 150309A: CrAO optic upper limit
- GRB 150309A: ISON-Kislovodsk optic upper limit
- GRB150309A: Optical observations at Crni Vrh
- GRB 150309A: MASTER prompt optical observation
- GRB 150309A: Swift detection of a burst
- GRB 150305A: a long GRB detected by INTEGRAL
- GRB 150301B: GROND afterglow observations
- GRB 150301A: Fermi GBM observation
- 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 150220A: Swift-XRT observations
- GRB 150222A: GROND optical afterglow candidate
- GRB 150222A: Enhanced Swift-XRT position
- GRB 150222A: Swift-BAT refined analysis
- GRB 150222A: Swift detection of a burst
- Trigger 631747: Swift detection of 4U 0614+09
- GRB 150213B: Swift-BAT refined analysis
- GRB 150213B: Swift detection of a burst with an optical afterglow
- GRB 150210A: MASTER SN detection during LAT error box inspection
- GRB 150206B: Fermi GBM detection
- Trigger 630047: Swift detection of 1RXS J180408.9-342058
- GRB 150206B: iPTF Optical Observations
- GRB 150206A: Swift detection of a burst with an optical afterglow
- GRB 150203A: REM optical and NIR observations
- GRB 150203A: Fermi GBM observation
- GRB 150203A: Swift detection of a burst
- Konus-Wind observation of GRB 150201A
- GRB 150201A: Fermi GBM observation
- GRB 150201A: Swift detection of a burst
- GRB 150128A: MASTER OT detction during inspection
- IPN Triangulation of GRB 150127A
- GRB 150127A: Fermi-LAT detection
- GRB150127A: Fermi GBM Detection
- GRB 150123A: MAXI/GSC detection
- Konus-Wind observation of GRB 150118B
- IPN Triangulation of GRB 150118B (long/intense)
- GRB 150118B: Fermi GBM Detection
- GRB 150118B: Fermi-LAT detection
- The Swift Detection of a Large Flare from the RS CVn Binary SZ Psc
- Swift detection of the variable star SZ Psc
- GRB 150110B: Swift detection of a burst
- Swift detection of 4U 1700+24 (= V* V934 Her)
- GRB 141225A: MASTER-SAAO first OT detection
- GRB 141225A: UVOT detection
- GRB 141225A: Optical aftergow confirmation
- GRB 141225A: LT optical candidate
- GRB 141225A: 1.23m CAHA optical observations
- GRB 141222A: First MASTER-SAAO optical observation
- GRB 141222A: Fermi-LAT detection
- GRB141221A: GROND Afterglow Detection
- GRB 141212A: Swift-BAT refined analysis
- Swift detection of 4U 1700+24 (= V934 Her)
- GRB 141212A: extended object within the XRT error circle
- GRB 141212A: Swift detection of a short burst
- GRB 141202A: Swift/UVOT Detection of a Variable Source Near the IPN Error Box
- GRB 141121A: Mondy optical observations
- IPN Triangulation of GRB 141202A (short/hard)
- GRB 141124A: iPTF upper limits
- GRB 141121A: Swift detection of a burst
- Swift Trigger 618673: probable noise event
- Trigger 618634: Swift detection of Vela X-1
- GRB 141109B: optical upper limits
- Swift Trigger 618402: probable noise event
- GRB 141109B: MITSuME Akeno upper limits
- GRB141109A : Xinglong TNT optical observation
- GRB 141109A: MITSuME Ishigakijima upper limits
- GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
- GRB 141109A: GROND afterglow observation
- X-shooter redshift of GRB 141109A
- GRB 141109A: REM NIR candidate afterglow
- GRB 141031A, Swift-BAT refined analysis
- GRB 141028A: SAO RAS Zeiss-1000 photometry
- GRB 140509A: GROND afterglow detection
- GRB 141029A: MAXI/GSC detection
- GRB 141026A: SAO RAS Zeiss-1000 observations