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"

11835 results found.

  1. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  2. Fermi GRB 220523A: Global MASTER-Net observations report
  3. GRB 220521A: Fermi GBM detection
  4. GRB 220521A: Sintesz-Newton/CrAO optical upper limit
  5. GRB 220521A: NOT optical afterglow detection
  6. GRB 220521A: Prompt enhanced Swift-XRT position
  7. GRB 220521A: Swift detection of a burst
  8. GRB 220521A: Fermi GBM Final Real-time Localization
  9. Swift GRB220521.97: Global MASTER-Net observations report
  10. Konus-Wind detection of GRB 220519A
  11. Swift BAT Trigger 1107209 is not an astrophysical event
  12. GRB 220514A: AstroSat CZTI detection
  13. Swift GRB220519.84: Global MASTER-Net observations report
  14. GRB 220518A: Swift-XRT refined Analysis
  15. GRB 220518A: Swift detection of a burst
  16. Konus-Wind detection of GRB 220506A
  17. Konus-Wind detection of GRB 220514B
  18. Fermi-LAT Gamma-ray Observations of IceCube-220513A
  19. GRB 220514B: MAXI/GSC detection
  20. GRB 220514A: a long GRB detected by INTEGRAL
  21. IceCube Alert 220513.97: Global MASTER-Net observations report
  22. GRB 220513A: Fermi GBM Final Real-time Localization
  23. Konus-Wind detection of GRB 220511A
  24. GRB 220511A: AstroSat CZTI detection
  25. GRB 220511A: AGILE detection
  26. GRB 220507A: AstroSat CZTI detection
  27. Fermi-LAT Gamma-ray Observations of IceCube-220509A
  28. Fermi trigger No 673846271: Global MASTER-Net observations report
  29. Swift GRB220506.51: Global MASTER-Net observations report
  30. GRB 220506A/MAXI J1558-266: MAXI/GSC detection
  31. Fermi-LAT Gamma-ray Observations of IceCube-220501A
  32. GRB 220501A: BOOTES-1 optical upper limit
  33. GRB 220430A: AstroSat CZTI detection
  34. GRB 220430A: Swift-BAT refined analysis
  35. GRB 220430A: CAHA 2.2m telescope optical limit
  36. GRB 220430A: Mondy and AbAO optical upper limits
  37. GRB 220430A: AGILE detection
  38. GRB 220430A: MeerLICHT optical upper limits
  39. IceCube-220421A: Upper limits from a search for additional neutrino events in IceCube
  40. Konus-Wind detection of GRB 220427A
  41. Konus-Wind detection of GRB 220426A
  42. GRB 220426C: Swift/BAT-GUANO detection outside the coded FOV (short)
  43. Fermi GRB 220426A: Global MASTER-Net observations report
  44. GRB 220426A: Swift/BAT-GUANO detection outside the coded FOV
  45. Fermi-LAT Gamma-ray Observations of IceCube-220425A
  46. Fermi GRB 220426B: Global MASTER-Net observations report
  47. Fermi-LAT Gamma-ray Observations of IceCube-220424A
  48. IceCube Alert 220425.11: Global MASTER-Net observations report
  49. Fermi trigger No 672492774: Global MASTER-Net observations report
  50. GRB 220423A: Swift/BAT-GUANO detection outside the coded FOV
  51. IceCube Alert 220424.05: Global MASTER-Net observations report
  52. GRB 220423A: AGILE detection
  53. Fermi-LAT Gamma-ray Observations of IceCube-220421A
  54. GRB 220421A: Swift/BAT-GUANO detection outside the coded FOV
  55. Fermi GBM trigger 672128054/220420260 is not a GRB
  56. IceCube-220421A - IceCube observation of a high-energy neutrino candidate track-like event
  57. Fermi trigger No 672093919: Global MASTER-Net observations report
  58. GRB 220420A: Swift/BAT-GUANO detection outside the coded FOV
  59. IPN triangulation of GRB 220411A
  60. GRB 220418B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  61. GRB 220417A: Swift/BAT-GUANO detection outside the coded FOV
  62. Fermi GRB 220417A: Global MASTER-Net observations report
  63. Konus-Wind detection of GRB 220412B
  64. GRB 220412B: Fermi GBM observation
  65. Konus-Wind detection of GRB 220403C
  66. Konus-Wind detection of GRB 220408B
  67. GRB 220412A: Swift-BAT refined analysis
  68. GRB 220408B: Fermi-LAT detection
  69. GRB 220412A: Swift-XRT refined Analysis
  70. GRB 220412A: Enhanced Swift-XRT position
  71. GRB 220412A: Swift/UVOT Upper Limits
  72. GRB 220408A: GRANDMA observations
  73. GRB 220412A: Swift detection of a burst
  74. Swift GRB220412.28: Global MASTER-Net observations report
  75. GRB 220411A: AstroSat CZTI detection
  76. IPN triangulation of GRB 220408B
  77. IPN triangulation of GRB 220403C
  78. Fermi GRB 220411A: Global MASTER-Net observations report
  79. GRB 220411A: BALROG localization (Fermi Trigger 671354405/ GRB 220411306)
  80. GRB 220411A: Fermi GBM Final Real-time Localization
  81. GRB 220408A: LOAO, DOAO, and, SAO optical upper limit
  82. GRB 220408B: AstroSat CZTI detection
  83. GRB 220408A: Swift-XRT refined Analysis
  84. Fermi GRB 220408B: Global MASTER-Net observations report
  85. GRB 220408A: Fermi GBM observation
  86. Chandra upper limit at the location of GRB 220408A
  87. GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51
  88. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, SAO RAS, CrAO)
  89. Fermi-LAT Gamma-ray Observations of IceCube-220405B
  90. GRB 220403B: Mondy optical upper limit
  91. IceCube-220405B: No Candidate Counterparts from the Zwicky Transient Facility
  92. GRB 220403B: 1.5m OSN optical observation
  93. IceCube-220405A - IceCube observation of a high-energy neutrino candidate track-like event
  94. Fermi-LAT Gamma-ray Observations of IceCube-220405A
  95. IceCube Alert 220405.21: Global MASTER-Net observations report
  96. GRB 220403B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  97. GRB 220403B: Fermi GBM detection
  98. GRB 220404A: Swift detection of a burst
  99. GRB 220403C (or A): Swift/BAT-GUANO detection outside the coded FOV
  100. GRB 220403B: Swift detection of a burst with an optical counterpart

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