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"8293 results found.
- GRB 160816A: LCOGT-FTN optical candidate
- GRB 160816A: Swift ToO observations
- GRB 160815A: Swift detection of a burst
- INTEGRAL/SPI-ACS and IBIS_VETO search for prompt gamma-ray counterpart of IceCube-160806A
- IceCube 160806A EHE Neutrino Candidate Event
- Swift Trigger 707545 is likely 4U 1850-03/GS1843-02
- Swift Trigger 707517 is probably not a GRB
- GRB 160802A: CALET Gamma-Ray Burst Monitor detection
- IceCube-160731A: Konus-Wind limits
- Search for counterpart to IceCube-160731A with ANTARES
- GRB 160804A: TNG optical observations, afterglow fading and candidate host galaxy
- IceCube-160731A: iPTF P48 Observations
- GRB 160801A: SAO RAS optical observations
- GRB 160802A: Fermi GBM detection
- Global MASTER net follow up of IceCube-160731A
- GRB 160801A: Swift detection of a burst
- HAWC follow up of IceCube 160731
- GBM observation of SGR-like burst from the direction of PSR 1119-6127
- Trigger 706396: Swift detection of a short burst from PSR 1119-6127
- GRB 160716A: Swift detection of a burst
- Swift Trigger 704444 is probably not an astrophysical event.
- Swift Trigger 704327: a possible GRB
- GRB 160712A: Swift/UVOT Upper Limits
- GRB 160712A: Initial Swift/UVOT observations
- GRB 160709A: Tiled Swift observations
- GRB 160705B: LT optical candidate
- GRB 160705B: Swift detection of a burst
- GRB 160703A: Swift detection of a burst
- GRB 160629A: Swift ToO observations
- GRB 160630A: Swift detection of a burst
- Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
- Swift Trigger 701668 is probably not an astrophysical event
- Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
- GRB 160625B: Tiled Swift observations
- GRB 160624A: Swift detection of a short burst
- Trigger 701182: Swift detection of SGR 1935+2154
- GRB 160623A: Swift ToO observations
- GRB 160622A: Swift detection of a possible short GRB or a new SGR
- LIGO/Virgo G197392 / LVT151012: Sky maps and other data available in LOSC
- GRB 160612A: Swift ToO observations
- Trigger 689956: Swift detection of a source near the Galactic center
- GRB 160607A: GROND confirmation of the afterglow
- GRB 160607A: candidate optical afterglow from the NOT
- GRB 160607A: Swift detection of a bright burst
- GRB 160530A: further Swift-XRT follow-up observations
- Trigger 689353: Swift detection of a transient near Sgr A*
- GRB160601A: Gemini Imaging
- GRB 160601A: GTC observations confirming transient source decay
- GRB160601A: NOT detection of an afterglow candidate
- GRB 160530A: Swift follow-up and X-ray afterglow candidate
- GRB 160601A: Swift detection of a short hard burst
- GRB 160530A: Tiled Swift observations
- GRB 160525B: Swift detection of a burst
- GRB 160425A: SMARTS late-time observations
- Another Swift detection of SGR 1935+2154 (trigger #687124)
- Swift detection of SGR 1935+2154
- GRB 160521B: Swift ToO observations
- Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
- Trigger 686443: Swift detection of SGR 1935+2154
- Fermi GBM trigger 484906918/160514349 is not a GRB
- GRB 160509A: DCT Imaging / Afterglow Confirmation
- GRB 160509A: VLA Detection
- GRB 160509A: Swift/UVOT Upper Limit
- GRB 160509A Gemini North candidate afterglow
- GRB 160509A: optical observations
- GRB 160509A: Tiled Swift observations
- GRB 160506A: Swift detection of a burst
- IceCube-160427A: iPTF Observations
- GRB 160504A: Swift detection of a burst
- ICECUBE-160427A : Pan-STARRS imaging and optical transients in the field
- GRB 160501A: Swift detection of a burst
- ICECUBE-160427A neutrino candidate event: updated direction information
- Archival observations by HAWC of IceCube HESE event of April 27, 2016
- Fermi/LAT search for counterpart to the IceCube event 67093193 (run 127853)
- GRB 160422A: XRT Afterglow Confirmation
- LSGT observation of GRB 160425A
- GRB 160422A: Swift/UVOT Afterglow Confirmation
- GRB 160425A: Swift detection of an unusual burst with an optical afterglow
- LIGO/Virgo G197392 / LVT151012: Identification of a GW CBC Candidate
- GRB 160424A: Swift-BAT refined analysis
- GRB 160424A: Swift/UVOT Upper Limit
- GRB 160422A: Swift-XRT afterglow detection
- GRB 160422A: Swift/UVOT Candidate Afterglow
- GRB 160422A: Swift ToO observations
- GRB 160417A: Swift detection of a burst with an optical counterpart
- GRB 160411A - Gemini-S afterglow candidate
- GRB 160410A: further NOT optical observations
- GRB 160412A: Swift detection of a burst
- GRB 160409A: Swift ToO observations
- GRB 160410A: Swift detection of a (possibly-short) burst with an optical counterpart
- GRB 160408A: Swift detection of a short burst
- GRB 160401A: Swift ToO observations
- GRB 160327A: Swift detection of a burst
- GRB 160325A: afterglow confirmation
- GRB160325A Swift/UVOT Detection
- GRB 160325A: Swift detection of a burst
- Swift detects GX 301-2 in very high state
- GRB 160321A: Swift detection of a probable burst
- Swift detection of a likely new SGR: SGR 0755-2933
- GRB 160314A: Optical observations from OSN