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"19090 results found.
- GRB 160623A: Swift/UVOT Upper Limits
- GRB 160623A: RATIR Optical and NIR Observations, Afterglow Confirmation
- GRB 160624A: Enhanced Swift-XRT position
- GRB160624A:possible GRB host redshift
- GRB 160623A: Mondy optical observations
- GRB 160624A: Swift detection of a short burst
- GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
- Trigger 701182: Swift detection of SGR 1935+2154
- GRB 160623A / Galactic transient: Fermi-LAT detection
- GRB 160623A: Swift ToO observations
- SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
- Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
- BAT trigger 700791 (possible GRB 160622A) is SNR RCW 103
- GRB 160622A: Swift detection of a possible short GRB or a new SGR
- GRB 160612A: Swift-XRT observations
- GRB 160612A: Swift ToO observations
- IPN Triangulation of GRB 160612A (short/hard)
- GRB 160611A: Swift/UVOT observations
- GRB 160611A: Swift-BAT refined analysis
- GRB 160611A: Enhanced Swift-XRT position
- GRB 160611A: Swift-XRT observations
- SWIFT J174540.2-290037, Swift-BAT refined analysis (trigger 690197)
- SWIFT J174540.2-290037, Swift-BAT refined analysis (trigger 689956)
- Trigger 689956: Swift detection of a source near the Galactic center
- GRB 160607A: Swift/UVOT Upper Limits
- GRB 160607A: GROND confirmation of the afterglow
- GRB 160607A: candidate optical afterglow from the NOT
- Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
- GRB 160607A: Enhanced Swift-XRT position
- GRB 160607A: Swift detection of a bright burst
- Trigger 689353: Swift detection of a transient near Sgr A*
- GRB 160601A: AbAO optical observations
- GRB 160601A: Swift/UVOT Upper Limits
- GRB 160601A: GTC observations confirming transient source decay
- GRB 160601A: Mondy optical observations, photometry of NOT sources
- GRB160601A: NOT afterglow confirmation
- GRB160601A: NOT detection of an afterglow candidate
- GRB 160601A: Enhanced Swift-XRT position
- GRB 160601A: Mondy optical observations
- GRB 160601A: MITSuME Okayama Ks-band upper-limit
- GRB 160601A: MITSuME Okayama upper limits
- GRB 160601A: Swift detection of a short hard burst
- GRB 160530A: discovery with the Compton Spectrometer and Imager
- GRB 160530A: Tiled Swift observations
- GRB 160525B: Mondy optical upper limit
- GRB 160525B: Khureltogot optical upper limit
- GRB 160525B: Swift-BAT refined analysis
- GRB 160525B: Nanshan optical upper limit
- GRB 160525B: Swift/UVOT Detection
- GRB 160521B: Swift-XRT afterglow detection
- GRB 160525B: Enhanced Swift-XRT position
- GRB 160525B: Swift detection of a burst
- GRB 160521B: Theoretical estimate of the redshift and urgent need for further x-ray observations
- Another Swift detection of SGR 1935+2154 (trigger #687124)
- Swift detection of SGR 1935+2154
- GRB 160521B: Swift ToO observations
- Konus-Wind observation of a bright burst from SGR 1935+2154
- SGR 1935+2154: AbAO optical upper limit
- Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
- Trigger 686443: Swift detection of SGR 1935+2154
- GRB 160509A: CALET Gamma-Ray Burst Monitor detection
- GRB 160509A: non-observation of VHE emission with HAWC
- GRB 160508A: CALET Gamma-Ray Burst Monitor detection
- GRB 160509A Gemini North redshift
- GRB 160509A: Fermi GBM Detection
- GRB 160509A Gemini North candidate afterglow
- GRB 160509A: optical observations
- GRB 160509A: Swift-XRT afterglow detection
- GRB 160509A: Preliminary XRT positon
- GRB 160509A: Tiled Swift observations
- GRB 160506A: TAROT La Silla observatory optical observations
- GRB 160506A: IRSF upper limits
- GRB 160506A: Swift/UVOT Upper Limits
- GRB 160506A: GROND upper limits
- GRB 160506A: Enhanced Swift-XRT position
- GRB 160506A: Swift detection of a burst
- GRB 160504A: RATIR Optical and NIR Observations
- GRB 160504A: Swift/UVOT Upper Limits
- GRB160504A: Gemini NIR Observations
- GRB 160504A: Bassano Bresciano Observatory upper limits
- GRB 160504A: Enhanced Swift-XRT position
- GRB 160504A: NOT upper limits
- GRB 160504A: TAROT Calern observatory optical observations
- GRB 160504A: Swift detection of a burst
- ICECUBE-160427A : Pan-STARRS imaging and optical transients in the field
- GRB 160503A: Fermi GBM observation
- VERITAS rapid follow-up observations of IceCube event 160427A
- GRB 160501A: GROND Upper limits
- GRB 160501A: MITSuME Okayama upper limits
- GRB 160501A: UKIRT near-IR upper limits
- GRB 160501A: Swift/UVOT Upper Limits
- GRB 160501A: Swift-XRT refined Analysis
- GRB 160501A: RATIR Optical and NIR Observations
- GRB 160501A: Enhanced Swift-XRT position
- GRB 160501A: TAROT Calern observatory optical observations
- GRB 160501A: NOT optical and NIR observations
- GRB 160501A: Swift detection of a burst
- IceCube-160427A: Fermi GBM Observations
- Archival observations by HAWC of IceCube HESE event of April 27, 2016
- Fermi/LAT search for counterpart to the IceCube event 67093193 (run 127853)