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"27245 results found.
- GRB 170514A CALET Gamma-Ray Burst Monitor detection
- GRB 170519A: Continued RATIR Optical and NIR Observations
- GRB 170519A: NOT optical observations
- GRB170519A, Swift-UVOT Detection
- GRB 170519A: BOOTES-5/JGT early optical detection
- LIGO/Virgo G284239: DLT40 follow-up observation
- GRB 170519A: Swift-XRT refined Analysis
- GRB 170519A: Swift-BAT refined analysis
- GRB 170519A: RATIR Optical and NIR Observations
- GRB 170519A: optical observations
- GRB 170519A: Swift detection of a burst with an optical counterpart
- GRB 170510A CALET Gamma-Ray Burst Monitor detection
- GRB 170516A: Swift-BAT refined analysis
- GRB 170516A: Swift-XRT refined Analysis
- AXP CXOU J164710.2-455216: Fermi GBM observation
- GRB 170516A: Swift/UVOT Upper Limits
- GRB 170516A: Swift detection of a burst
- Swift Trigger AXP CXOU J164710.2-455216: MASTER-OAFA observations
- Swift Trigger on AXP CXOU J164710.2-455216
- GRB 170514A: Fermi GBM detection
- Fermi GBM trigger 516459580/170514541 is not a GRB
- GRB 170510A: Global MASTER Net possible OT observations
- GRB 170510A: Fermi GBM observation
- LIGO/Virgo G284239: H.E.S.S. very-high energy gamma-ray follow-up
- LIGO/Virgo G284239: MAXI/GSC observations
- GRB 170510A: Fermi-LAT detection
- Swift Trigger 752193 is not a GRB
- LIGO/Virgo G284239: AstroSat CZTI upper limits
- Trigger 751928: Swift misidentification of Cen X-3
- GRB 170423A: TAROT Reunion observatory optical observations
- LIGO/Virgo G284239:SVOM/Mini-GWAC observations of the initial skymap
- LIGO/VIRGO G284239: Fermi GBM Upper Limits
- LIGO/Virgo G284239: HAWC follow-up
- LIGO/Virgo G284239: MASTER automatic follow up and synchronous observations
- LIGO/Virgo G284239: Fermi-LAT search for a high-energy gamma-ray counterpart
- LIGO/Virgo G284239: TZAC TAROT network observations with TRE/TCA/TCH
- GRB 170428A CALET Gamma-Ray Burst Monitor detection
- LIGO/Virgo G284239: Swift/BAT data search
- LIGO/Virgo G284239: AGILE GRID observations
- LIGO/Virgo G284239: INTEGRAL search for a prompt gamma-ray counterpart
- LIGO/Virgo G284239: IceCube neutrino observations
- Swift Trigger 748858: 15 GHz upper limits from AMI
- Short GRB 170428A: MASTER-OAFA final reduction of the optical observations
- GRB 170428A: DCT Imaging
- GRB 170428A: TAROT La Silla observatory optical observations
- GRB 170428A: RATIR Afterglow Confirmation
- GRB 170428A: GROND detection of the afterglow
- GRB 170428A: Swift/UVOT Upper Limits
- GRB 170428A: Swift-XRT refined Analysis
- GRB 170428A: Swift-BAT refined analysis
- GRB 170428A: MASTER-OAFA early optical observations
- Swift Trigger 750337 is probably a noise fluctuation
- GRB 170428A: Swift detection of a short burst
- Swift trigger 750096 - OT candidate
- GRB170426.95 MASTER-Net OT detection
- Swift Trigger 750096 is probably a noise fluctuation
- Swift Trigger 750044 is probably a noise fluctuation
- GRB 170419A: Swift/UVOT Upper Limits
- GRB 170424A: Fermi GBM detection
- GRB 170424A: Fermi-LAT detection
- GRB 170423A: Fermi GBM detection
- Swift Trigger 748858: AbAO and TSHAO optical observations
- Fermi GBM trigger 514436208/170421123 is not a GRB
- Swift Trigger 748858: TAROT La Silla observatory optical observations
- Swift Trigger 748858: RATIR Optical and NIR Observations
- GRB 170419B, Swift-BAT refined analysis
- GRB 170419B: Zadko observatory - Gingin optical observations
- GRB 170419A: Zadko observatory - Gingin optical observations
- Fermi GBM trigger 514379207/170420463 is not a GRB
- GRB 170419A: Swift-XRT refined Analysis
- GRB 170412A CALET Gamma-Ray Burst Monitor detection
- GRB 170419B: Fermi GBM observation
- GRB 170419A: Swift-BAT refined analysis
- Swift trigger 748858: Swift BAT, XRT, and UVOT refined analysis
- GRB 170419B: Swift detection of a burst
- Swift Trigger 748858: MASTER-OAFA early optical observations
- GRB 170419A: Swift detection of a burst
- Swift Trigger 748858: Zadko observatory - Gingin optical observations
- Swift Trigger 748858: a possible GRB
- LIGO/Virgo G275404: DLT40 follow-up observation
- LIGO/Virgo G277583: DLT40 follow-up observation
- GRB 170409A: TAROT Reunion observatory optical observations
- GRB 170402A: AstroSat CZTI detection
- GRB 170409A: Fermi GBM Observation
- GRB 170409A: Fermi-LAT detection
- GRB 170403B CALET Gamma-Ray Burst Monitor detection
- GRB170405A, Swift-UVOT Detection
- GRB 170405A, Swift-BAT refined analysis
- GRB 170405A: Etelman observatory optical observations
- GRB 170405A: Swift-XRT refined Analysis
- GRB 170405A: RATIR Optical and NIR Observations
- Trigger 745966: Swift detection of 4U1850-03
- GRB 170405A: Watcher optical detection
- GRB 170405A: TAROT Reunion observatory optical observations
- GRB 170405A: NOT optical observations
- GRB 170405A: Fermi-LAT detection
- GRB 170405A: Fermi GBM observation
- GRB 170405A: Swift detection of a burst with an optical counterpart
- LIGO/Virgo G275697: Update on significance from offline analyses
- LIGO/Virgo G275404: Update on significance from offline analyses