Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

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').
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"

14954 results found.

  1. GRB 220525A: CALET Gamma-Ray Burst Monitor detection
  2. GRB 220523B: CALET Gamma-Ray Burst Monitor detection
  3. Konus-Wind detection of GRB 220524B
  4. Konus-Wind detection of GRB 220525A
  5. Konus-Wind detection of GRB 220524A
  6. IPN triangulation of GRB 220525A
  7. GRB 220525A: Fermi GBM Final Real-time Localization
  8. GRB 220521A: ATCA detection
  9. GRB 220521A: ALMA detection
  10. Konus-Wind detection of GRB 220522B
  11. GRB 220521A: BOOTES-2/TELMA and CAHA 2.2m telescope optical upper limit
  12. Konus-Wind detection of GRB 220521B
  13. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  14. IceCube-220524A - IceCube observation of a high-energy neutrino candidate track-like event
  15. GRB 220521A: Gemini Observations
  16. GRB 220523B: Fermi GBM detection
  17. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  18. GRB 220523A: Fermi GBM Final Real-time Localization
  19. GRB 220521A: LCO Optical Detection
  20. GRB 220521A: Fermi GBM detection
  21. GRB 220521A: RATIR Optical and NIR Observations
  22. GRB 220522A: Fermi GBM Final Real-time Localization
  23. GRB 220521A: NOT optical afterglow detection
  24. GRB 220521A: Swift detection of a burst
  25. GRB 220521A: Fermi GBM Final Real-time Localization
  26. Konus-Wind detection of GRB 220519A
  27. GRB 220514A: AstroSat CZTI detection
  28. Continued Chandra monitoring of GW170817 at ~4.8 yr post-merger
  29. GRB 220518B: Fermi GBM Final Real-time Localization
  30. GRB 220518A: Swift/UVOT Detection
  31. GRB 220518A: Swift detection of a burst
  32. Konus-Wind detection of GRB 220506A
  33. Konus-Wind detection of GRB 220514B
  34. GRB 220511A: Swift-XRT afterglow detection
  35. IceCube-220513A: No significant detection in HAWC
  36. GRB 220514B: MAXI/GSC detection
  37. GRB 220514A: MeerLICHT optical afterglow candidate
  38. GRB 220514A: Fermi GBM Final Real-time Localization
  39. IceCube-220513A - IceCube observation of a high-energy neutrino candidate track-like event
  40. GRB 220513A: Fermi GBM Final Real-time Localization
  41. Konus-Wind detection of GRB 220511A
  42. GRB 220427A: MeerLICHT afterglow observations
  43. IceCube-220509A: No significant detection in HAWC
  44. GRB 220511A: AstroSat CZTI detection
  45. GRB 220511A: BOOTES-2/TELMA optical upper limit
  46. GRB 220512A: Fermi GBM Final Real-time Localization
  47. GRB 220511A: AGILE detection
  48. GRB 220511A: Fermi GBM Final Real-time Localization
  49. GRB 220507A: AstroSat CZTI detection
  50. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  51. IceCube-220509A - IceCube observation of a high-energy neutrino candidate track-like event
  52. GRB 220508A: Fermi GBM Final Real-time Localization
  53. GRB 220507A: Fermi GBM Final Localization
  54. GRB 220506A: BOOTES-5/JGT optical upper limit
  55. GRB 220506A: Swift-XRT afterglow detection
  56. GRB 220506A/MAXI J1558-266: MAXI/GSC detection
  57. IPN triangulation of GRB 220423A
  58. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  59. GRB 220501A: BOOTES-1 optical upper limit
  60. GRB 220430A: AstroSat CZTI detection
  61. IceCube-220501A - IceCube observation of a high-energy neutrino candidate track-like event
  62. GRB 220501A: Fermi GBM Final Real-time Localization
  63. GRB 220501A: Swift detection of a burst
  64. GRB 220430A: CAHA 2.2m telescope optical limit
  65. GRB 220430A: AGILE detection
  66. GRB 220430A: Swift detection of a burst or Swift J0630.4+0932
  67. GRB 220423A: Detection by VZLUSAT-2
  68. Konus-Wind detection of GRB 220427A
  69. GRB 220427A: Swift detection of a burst with an optical counterpart
  70. Konus-Wind detection of GRB 220426A
  71. IPN triangulation of GRB 220426A
  72. GRB 220426C: Swift/BAT-GUANO detection outside the coded FOV (short)
  73. GRB 220426A: Fermi GBM detection
  74. GRB 220426A: Swift/BAT-GUANO detection outside the coded FOV
  75. GRB 220426B: Fermi GBM Final Real-time Localization
  76. Correction to 31937: GRB 220421B: Detection by VZLUSAT-2
  77. IceCube-220425A: MASTER: flaring blazar TXS 1742-078 as the possible neutrino source candidate
  78. IceCube-220425A - IceCube observation of a high-energy neutrino candidate track-like event
  79. GRB 220423A: Swift/BAT-GUANO detection outside the coded FOV
  80. IceCube-220424A - IceCube observation of a high-energy neutrino candidate track-like event
  81. On the AGILE detection of GRB 220423A
  82. GRB 220423A: AGILE detection
  83. GRB 220421B: Detection by VZLUSAT-2
  84. GRB 220421A: Swift/BAT-GUANO detection outside the coded FOV
  85. IceCube-220421A - IceCube observation of a high-energy neutrino candidate track-like event
  86. GRB 220420A: Swift/BAT-GUANO detection outside the coded FOV
  87. GRB 220417A: Fermi GBM detection
  88. IPN triangulation of GRB 220411A
  89. GRB 220417A: Swift/BAT-GUANO detection outside the coded FOV
  90. GRB 220418B: Fermi GBM Final Real-time Localization
  91. GRB 220418A: Fermi GBM Final Real-time Localization
  92. GRB 220417A: Fermi GBM Final Real-time Localization
  93. Konus-Wind detection of GRB 220412B
  94. Konus-Wind detection of GRB 220403C
  95. Konus-Wind detection of GRB 220408B
  96. GRB 220412A: BOOTES-network optical upper limits
  97. GRB 220412B: BOOTES-1 optical upper limit
  98. GRB 220408B: Fermi-LAT detection
  99. GRB 220412B: Swift detection of a short burst
  100. GRB 220412A: Swift detection of a burst

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov