Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. See news and announcements

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').
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"

20536 results found.

  1. LIGO/Virgo G297595: REM optical/NIR observations
  2. LIGO/Virgo G297595 : MAXI/GSC observations
  3. GRB 170810A: VLA Detection
  4. LIGO/Virgo G297595: Pan-STARRS coverage and transients over the first 5hrs
  5. LIGO/Virgo G297595: Insight-HXMT observations
  6. LIGO/Virgo G297595: Nearby Galaxies in the Localization Volume
  7. LIGO/Virgo G297595: Fermi GBM Observations
  8. LIGO/Virgo G297595: AGILE GRID observations
  9. GRB 170813A: Swift/UVOT Upper Limits
  10. LIGO/Virgo G297595: INTEGRAL search for a prompt gamma-ray counterpart
  11. LIGO/Virgo G297595: AGILE MCAL observations
  12. LIGO/Virgo G297595: IceCube neutrino observations
  13. GRB 170813A: RATIR Optical and NIR Observations
  14. LIGO/Virgo G296853: Liverpool Telescope classification of MASTER OT J013646.48-140323.5
  15. GRB 170728B: 15 GHz upper limits from AMI
  16. GRB 170728A: 15 GHz upper limits from AMI
  17. GRB 170714A: 15 GHz upper limits from AMI
  18. GRB 170711A: 15 GHz upper limits from AMI
  19. GRB 170710C: 15 GHz upper limits from AMI
  20. GRB 170710B: 15 GHz upper limits from AMI
  21. GRB 170626A: 15 GHz upper limits from AMI
  22. LIGO/Virgo G296853: BOOTES-1 and GTC optical observations
  23. LIGO/Virgo G296853: Insight-HXMT observations
  24. LIGO/Virgo G296853 : MAXI/GSC observations
  25. GRB 170810A: Swift/UVOT Detection
  26. GRB 170810A: Swift detection of a burst with a bright optical counterpart
  27. GRB 170810A: MASTER-NET very bright OT detection
  28. LIGO/Virgo G296853: Super-AGILE observations
  29. LIGO/Virgo G296853: MASTER SN detection near center error-area
  30. GMRT upper limit on the radio afterglow of GRB 170728B
  31. LIGO/Virgo G296853: Fermi GBM Observations
  32. LIGO/Virgo G296853: AGILE GRID observations
  33. LIGO/Virgo G296853: MASTER follow up observations
  34. LIGO/Virgo G296853: AGILE MCAL observations
  35. LIGO/Virgo G296853: IceCube neutrino observations
  36. GRB 170728B: TShAO, SAO RAS and AbAO optical observations
  37. GRB 170804A: LCO Observations
  38. GRB 170804A: Swift/UVOT Detection
  39. GRB 170803A: Swift/UVOT Detection
  40. Swift Trigger 765783 is not an astrophysical event.
  41. GRB 170728B: Swift/UVOT Further Analysis
  42. GRB 170714A: Chandra observations
  43. GRB 170728B: VLA radio afterglow detection
  44. GRB 170728B: Optical observations at Crni Vrh
  45. GRB 170728B: MASTER-IAC first minute short GRB early OT detection
  46. GRB 170728B: COATLI Observations And Confirmation of Fading
  47. GRB 170728B: Swift/UVOT Upper Limits
  48. GRB 170728A: Swift/UVOT Detection
  49. GRB 170728A: LCO observations
  50. GRB 170728B: NOT optical afterglow confirmation
  51. GRB 170728B: TNG optical afterglow candidate
  52. GRB170714A: ATCA observation
  53. GRB 170714A: Bastille Day Burst redshift from OSIRIS/GTC
  54. GRB 170714A: NOEMA non-detection of the Bastille Day Burst
  55. LIGO/Virgo G275697: LOFAR follow-up
  56. GRB 170710B: Further Swift-XRT observations
  57. Correction to GCN Circular 21351: GRB 170714A: Swift/UVOT Observations
  58. GRB170714A: VLA Observations of the Bastille Day Ultra-long Burst
  59. GRB 170714A: Swift/UVOT Observations
  60. GRB 170714A: TNG NIR observations
  61. GRB 170714A: z-band afterglow candidate for OSIRIS/GTC
  62. GRB 170714A: Bastille Day Burst: ULGRB or RTDE?
  63. GRB 170711A: ISON/Terskol and AbAO optical observations
  64. GRB 170711A: Swift/UVOT Upper Limits
  65. GRB 170711A: RATIR Optical and NIR Observations
  66. GRB 170705A: TShAO optical observations
  67. GRB 170710B: Swift-XRT and UVOT observations
  68. GRB 170710B: Swift ToO observations
  69. GRB170710A: Swift/UVOT detection
  70. Trigger 760835: Swift misidentification of GRS1716-249
  71. LIGO/Virgo G288732: Konus-Wind observations
  72. GRB 170705A: Further RATIR Optical and NIR Observations and Steepening of Fading
  73. GRB 170705A: KAIT Optical Observations
  74. GRB 170705A: ISON/Terskol optical observations
  75. GRB 170705A: Swift/UVOT Detection
  76. GRB 170705A: RATIR Optical and NIR Observations
  77. GRB 170705A: MASTER-OAFA early OT observations
  78. GRB 170626A: TShAO optical observations
  79. GRB 170607A: 15 GHz upper limits from AMI
  80. GRB 170626A: OASDG optical observations
  81. GRB 170626A: TNG optical observations
  82. GRB 170626A: SAO RAS possible OT detection
  83. LIGO/Virgo G288732: Fermi GBM Upper Limits for the LIGO Trigger and LAT Candidate
  84. LIGO/Virgo G288732: Pan-STARRS coverage of the Fermi/LAT candidate position
  85. LIGO/Virgo G288732: VLA imaging of the possible Fermi/LAT counterpart
  86. LIGO/Virgo G288732: Kiso/KWFC optical imaging of the possible Fermi/LAT counterpart
  87. LIGO/Virgo G288732: UKIRT near-IR imaging of the Fermi/LAT candidate
  88. LIGO/Virgo G288732: LBT optical imaging of the Fermi/LAT candidate
  89. LIGO/Virgo G288732 : MAXI/GSC observations
  90. GRB 170607A: ISON/Terskol optical observations
  91. LIGO/Virgo G288732: GWFUNC/NOWT observations of the skymap and follow-up of the Fermi/LAT candidate
  92. LIGO/Virgo G288732: Swift/UVOT follow up of the possible LAT counterpart
  93. LIGO/Virgo G288732: Swift-XRT follow up of the putative LAT counterpart
  94. LIGO/Virgo G288732: INTEGRAL search for a prompt gamma-ray counterpart
  95. LIGO/Virgo G288732:SVOM/Mini-GWAC observations of the initial skymap
  96. LIGO/Virgo G288732: AGILE GRID Observations
  97. LIGO/Virgo G288732: Fermi-LAT detection of a weak candidate
  98. LIGO/Virgo G288732: IceCube neutrino observations update
  99. GRB 170607A: Correction on the possible host galaxy identification
  100. LIGO/Virgo G288732: AGILE MCAL Observations

Advanced

Download all Circulars as a .tar.gz archive:
Looking for U.S. government information and services? Visit USA.gov