Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

27296 results found.

  1. GRB 240125A (short): Glowbug gamma-ray detection
  2. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  3. Swift trigger 1210856 is not astrophysical
  4. GRB 240122B: CALET Gamma-Ray Burst Monitor detection
  5. GRB 240123A: Swift-BAT refined analysis
  6. IceCube Alert 240123.48: Global MASTER-Net observations report
  7. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  8. Fermi/GBM trigger 727752941: BALROG analysis retraction
  9. GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)
  10. Fermi GRB 240123B: Global MASTER-Net observations report
  11. GRB 240122A: Swift/UVOT Upper Limits
  12. GRB 240123A: Swift-XRT refined Analysis
  13. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  14. Fermi GBM Sub-Threshold Detection of GRB 240123A
  15. GRB 240123B: Fermi GBM Final Real-time Localization
  16. GRB 240118A: Swift/UVOT Upper Limits
  17. GRB 240122B: Glowbug gamma-ray detection
  18. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  19. Swift GRB240123.46: Global MASTER-Net observations report
  20. GRB 240122A: VLT/X-shooter redshift confirmation
  21. GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
  22. GRB 240122A: GOTO optical counterpart candidate
  23. IPN triangulation of GRB 240119A (short)
  24. GRB 240119A: GECAM detection of a short burst
  25. GRB 240118C: GECAM-B detection of a long burst
  26. GRB 240118C: Fermi GBM Observation
  27. Fermi GRB 240119A: Global MASTER-Net observations report
  28. GRB 240119A: Fermi GBM Final Localization
  29. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  30. GRB 240118C: Swift/BAT-GUANO detection of a burst
  31. GRB 240118A: GRBAlpha detection
  32. GRB 240115A: Fermi GBM Observation
  33. Swift triggers 1209631, 1209632, 1209635 and 1209644 are not interesting astrophysical events
  34. GRB 240118C: Fermi GBM Final Localization
  35. GRB 240118D: AstroSat CZTI detection
  36. GRB 240117A: AstroSat CZTI detection
  37. Fermi GRB 240118B: Global MASTER-Net observations report
  38. GRB 240117A: Glowbug gamma-ray detection
  39. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  40. GRB 240118C: BALROG localization (Fermi Trigger 727291408 / GRB 240118725)
  41. GRB 240118A: NuSTAR Detection of a Long GRB
  42. GRB 240118A: Fermi GBM Observation
  43. GRB 240118B: Fermi GBM Final Real-time Localization
  44. LAT GRB240118.08: Global MASTER-Net observations report
  45. GRB 240118A: Fermi-LAT detection
  46. GRID detection of GRB 231230A
  47. GRB 240118A: Fermi GBM Final Real-time Localization
  48. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  49. Swift Trigger 1209406 is not an astrophysical event
  50. Swift Triggers 1209401 and 1209403 are not astrophysical events
  51. Swift Triggers 1209371 through 1209374 are not astrophysical events
  52. Swift Triggers 1209369 and 1209370 are not astrophysical events
  53. LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO
  54. GRB 240115B: Fermi GBM Detection
  55. GRB 240112D: Glowbug gamma-ray detection
  56. GRB 240112C: Glowbug gamma-ray detection
  57. GRB 240112C: VZLUSAT-2 detection
  58. GRB 240107A: VZLUSAT-2 detection
  59. Integral GRB240115.70: Global MASTER-Net observations report
  60. Fermi GRB 240115B: Global MASTER-Net observations report
  61. GRB 240115B: Fermi GBM Final Real-time Localization
  62. Fermi GRB 240115A: Global MASTER-Net observations report
  63. GRB 240115A: Fermi GBM Final Real-time Localization
  64. GRB 240112C: GRBAlpha detection
  65. GRB 240112C: Swift/UVOT Detection
  66. GRB 240112C: Fermi GBM Detection
  67. Fermi trigger No 726773850: Global MASTER-Net observations report
  68. GRB 240112C: Swift-XRT refined Analysis
  69. GRB 240112E: Fermi GBM Final Localization
  70. Fermi GRB 240112D: Global MASTER-Net observations report
  71. GRB 240112D: Fermi GBM Final Real-time Localization
  72. Fermi trigger No 726774492: Global MASTER-Net observations report
  73. Swift GRB 240112C: Global MASTER-Net observations report
  74. Fermi GRB 240112B: Global MASTER-Net observations report
  75. GRB 240109A: Swift-BAT refined analysis
  76. GRB 240112C: Swift detection of a burst with an optical counterpart
  77. GRB 240112B: Fermi GBM Final Real-time Localization
  78. GRB 240112A: GECAM detection of a burst
  79. GRB 240109A: Fermi GBM Observation
  80. GRB 240110A: AstroSat CZTI detection
  81. GRB 240108A: Glowbug gamma-ray detection
  82. GRB 240109B: Fermi GBM Final Real-time Localization
  83. Swift GRB240109.17: Global MASTER-Net observations report
  84. GRB 240109A: Swift detection of a short burst
  85. LIGO/Virgo/KAGRA S240104bl: Upper limits from Swift/BAT-GUANO
  86. GRB 240106A: GRBAlpha detection
  87. Fermi trigger No 726347794: Global MASTER-Net observations report
  88. GRB 240106B: Fermi GBM Final Real-time Localization
  89. Fermi trigger No 726194053: Global MASTER-Net observations report
  90. GRB 240106A: Fermi GBM Final Real-time Localization
  91. IPN triangulation of GRB 240101C (short)
  92. GRB GRB240101C: Fermi GBM observation
  93. IceCube Alert 240105.52: Global MASTER-Net observations report
  94. GRB 240102A: 1.3m DFOT optical upper limit
  95. GRB 240101B: 1.3m DFOT optical upper limit
  96. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  97. GRB 240102C: AstroSat CZTI detection
  98. GRB 240102A: Swift-BAT refined analysis
  99. GRB 240102A: Swift/UVOT Upper Limits
  100. GRB 231230A: Swift-BAT refined analysis

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