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"

11622 results found.

  1. Fermi trigger No 736472503: Global MASTER-Net observations report
  2. GRB 240504A: BALROG localization (Fermi Trigger 736492377 / GRB 240504217)
  3. GRB 240504A: Fermi GBM Final Real-time Localization
  4. Fermi trigger No 736387941: Global MASTER-Net observations report
  5. GRB 240502A: GOTO optical upper limit
  6. Fermi trigger No 736379109: Global MASTER-Net observations report
  7. GRB 240502A: Fermi GBM Observation
  8. GRB 240502C: GOTO possible optical counterpart candidates
  9. Fermi GRB 240502B: Global MASTER-Net observations report
  10. GRB 240502C: Fermi GBM Final Localization
  11. Fermi GRB 240502A: Global MASTER-Net observations report
  12. GRB 240430A: GRBAlpha detection
  13. GRB 240502B: Fermi GBM Final Real-time Localization
  14. GRB 240502A: Fermi GBM Final Real-time Localization
  15. Fermi GRB 240501A: Global MASTER-Net observations report
  16. Fermi trigger No 736197684: Global MASTER-Net observations report
  17. GRB 240425A: VZLUSAT-2 detection
  18. GRB240430A: Fermi GBM Final Localization
  19. GRB 240501A: Fermi GBM Final Real-time Localization
  20. GRB 240407A: VZLUSAT-2 detection
  21. GRB 240425A: GRBAlpha detection
  22. Fermi-LAT gamma-ray observations of IceCube-240424A
  23. GRB 240429A: Fermi GBM Final Real-time Localization
  24. Fermi GRB 240428A: Global MASTER-Net observations report
  25. GRB 240428A: Fermi GBM Final Real-time Localization
  26. GRB 240425A: Fermi GBM Final Real-time Localization
  27. Fermi trigger No 735697285: Global MASTER-Net observations report
  28. GRB 240422A: Glowbug gamma-ray detection
  29. IceCube-240424A - IceCube observation of a high-energy neutrino candidate track-like event
  30. GRB 240421B: GRBAlpha detection
  31. LIGO/Virgo/KAGRA S240422ed: Upper limits from Fermi-GBM Observations
  32. Fermi trigger No 735470374: Global MASTER-Net observations report
  33. GRB 240421A: Glowbug gamma-ray detection
  34. GRB 240414A: radio detection with the VLA
  35. Fermi-LAT gamma-ray observations of IceCube-240419A
  36. Fermi GRB 240422A: Global MASTER-Net observations report
  37. GRB 240421B: AstroSat CZTI detection
  38. GRB 240422A: Fermi GBM Final Real-time Localization
  39. Fermi GRB 240421B: Global MASTER-Net observations report
  40. GRB 240421B: Fermi GBM Observation
  41. Fermi GRB 240421A: Global MASTER-Net observations report
  42. GRB 240421A: Fermi GBM Final Real-time Localization
  43. Fermi trigger No 735280430: Global MASTER-Net observations report
  44. IceCube-240419A - IceCube observation of a high-energy neutrino candidate track-like event
  45. IceCube-240419A - IceCube observation of a high-energy neutrino candidate track-like event
  46. Fermi trigger No 735089036: Global MASTER-Net observations report
  47. GRB 240411A: GOTO early optical upper limits
  48. Fermi GRB 240417A: Global MASTER-Net observations report
  49. Improved IPN triangulation of GRB 240411A
  50. GRB 240417A: Fermi GBM Final Real-time Localization
  51. GRB 240415A: Glowbug gamma-ray detection
  52. GRB 240414A: Glowbug gamma-ray detection
  53. GRB 240411A: Glowbug gamma-ray detection
  54. GRB 240415A: Fermi GBM Observation
  55. GRB 240415A: Earliest optical followup with the Kinder observations
  56. GRB 240415A: OHP/T193 optical observations
  57. GRB 240415A: optical afterglow detection from the INAF Asiago Observatory
  58. GRB 240415A: SAO RAS optical observations
  59. GRB 240414A: Fermi GBM Observation
  60. Fermi GRB 240415A: Global MASTER-Net observations report
  61. GRB 240415A: Mondy optical transient detection
  62. GRB 240414B: Fermi GBM Final Real-time Localization
  63. GRB 240415A: Swift detection of a burst
  64. GRB 240415A: Fermi GBM Final Real-time Localization
  65. Fermi trigger No 734754044: Global MASTER-Net observations report
  66. IPN triangulation of GRB 240411A
  67. Fermi-LAT gamma-ray observations of IceCube-240412A
  68. IceCube-240412A - IceCube observation of a high-energy neutrino candidate track-like event
  69. GRB 240411A: GRBAlpha detection
  70. GRB 240405A: Glowbug gamma-ray detection
  71. GRB 240411A: Fermi GBM Final Real-time Localization
  72. GRB 240405A: GRBAlpha detection
  73. Fermi GRB 240408A: Global MASTER-Net observations report
  74. GRB 240408A: Fermi GBM Final Real-time Localization
  75. GRB 240407A: BALROG localization (Fermi Trigger 734144396 / GRB 240407042)
  76. Fermi GRB 240407A: Global MASTER-Net observations report
  77. GRB 240407A: Fermi GBM Final Real-time Localization
  78. Fermi-LAT gamma-ray observations of IceCube-240327B
  79. Fermi-LAT gamma-ray observations of IceCube-240327A
  80. Fermi GRB 240405B: Global MASTER-Net observations report
  81. GRB 240405B: Fermi GBM Final Real-time Localization
  82. GRB 240405A: Fermi GBM Final Real-time Localization
  83. GRB 240331A: GRBAlpha detection
  84. GRB 240403B: Glowbug gamma-ray detection
  85. GRB 240403A: Glowbug gamma-ray detection
  86. GRB 240403A: Fermi GBM Detection
  87. Fermi GRB 240404A: Global MASTER-Net observations report
  88. GRB 240404A: Fermi GBM Final Real-time Localization
  89. GRB 240403A: BALROG localization (Fermi Trigger 733838255 / GRB 240403498)
  90. Fermi trigger No 733808041: Global MASTER-Net observations report
  91. Fermi GRB 240402A: Global MASTER-Net observations report
  92. GRB 240402A: Fermi GBM Final Real-time Localization
  93. GRB 240329A: Glowbug gamma-ray detection
  94. GRB 240331A: AstroSat CZTI detection
  95. GRB 240329A: AstroSat CZTI detection
  96. GRB 240331A: Fermi GBM Final Real-time Localization
  97. GRB 240329A: GRBAlpha detection
  98. Fermi trigger No 733366352: Global MASTER-Net observations report
  99. Fermi GRB 240329A: Global MASTER-Net observations report
  100. GRB 240329A: BALROG localization (Fermi Trigger 733441392 / GRB 240329905)

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