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"

39444 results found.

  1. GRB 220618A: Swift-BAT refined analysis
  2. GRB 220618A: iTelescope T-19 upper limit
  3. Konus-Wind detection of GRB 220617A
  4. Fermi trigger No 677377371: Global MASTER-Net observations report
  5. Fermi GRB 220620B: Global MASTER-Net observations report
  6. Fermi GRB 220620A: Global MASTER-Net observations report
  7. GRB 220620B: Fermi GBM Final Real-time Localization
  8. Integral GRB220619.53: Global MASTER-Net observations report
  9. GRB 220619A: AstroSat CZTI detection
  10. Swift GRB220620.02: Global MASTER-Net observations report
  11. GRB 220620A: Fermi GBM Final Real-time Localization
  12. GRB 220611A: Continued Gemini Infrared Observations
  13. GRB 220617A: TNG optical observations
  14. Fermi trigger No 677307509: Global MASTER-Net observations report
  15. Fermi trigger No 677236224: Global MASTER-Net observations report
  16. GRB 220617A: Fermi GBM observation
  17. GRB 220611A optical counterpart
  18. GRB 220618A: Swift-XRT refined Analysis
  19. IPN triangulation of GRB 220617A (short)
  20. GRB 220618A: BOOTES-5/JGT early optical upper limit
  21. GRB 220618A: Swift/UVOT Upper Limits
  22. GRB220611A: Gemini Optical Afterglow Confirmation
  23. GRB 220618A: Enhanced Swift-XRT position
  24. GRB 220617A: Swift-XRT observations
  25. GRB 220618A: Swift detection of a burst
  26. Swift GRB220618.38: Global MASTER-Net observations report
  27. GRB 220617A: Fermi-LAT detection
  28. GRB 220617B: Swift ToO observations
  29. Fermi GRB 220617A: Global MASTER-Net observations report
  30. GRB 220617A: Fermi GBM Final Real-time Localization
  31. GRB 220611A: Gemini Ks counterpart detection
  32. Fermi trigger No 677174940: Global MASTER-Net observations report
  33. Konus-Wind detection of GRB 220613A
  34. IPN triangulation of GRB 220613A
  35. GRB 220611A: Gemini South Infrared Detection
  36. IPN triangulation of GRB 220606C
  37. GRB 220611A: Swift/UVOT Upper Limits
  38. Fermi trigger No 676909037: Global MASTER-Net observations report
  39. GRB 220612A: CALET Gamma-Ray Burst Monitor detection
  40. GRB 220612A: Swift/BAT-GUANO detection
  41. GRB 220611A: Swift-BAT refined analysis
  42. GRB 220608B: Detection by VZLUSAT-2
  43. Swift GRB 220611A: Global MASTER-Net observations report
  44. GRB 220611A: Swift-XRT refined Analysis
  45. GRB 220610B: AstroSat CZTI detection
  46. GRB 220611A: Enhanced Swift-XRT position
  47. GRB 220611A: Swift detection of a burst
  48. IPN triangulation of GRB 220609B
  49. Fermi GRB 220610A: Global MASTER-Net observations report
  50. GRB 220610A: Fermi GBM Final Real-time Localization
  51. Fermi trigger No 676537486: Global MASTER-Net observations report
  52. GRB 220609B: AstroSat CZTI detection
  53. GRB 220609B: CALET Gamma-Ray Burst Monitor detection
  54. Fermi trigger No 676366592: Global MASTER-Net observations report
  55. GRB 220608A: AstroSat CZTI detection
  56. GRB 220609A: Fermi GBM Final Real-time Localization
  57. GRB 220606A: Fermi GBM observation
  58. GRB 220606C: CALET Gamma-Ray Burst Monitor detection
  59. Fermi GRB 220608A: Global MASTER-Net observations report
  60. GRB 220608A: Fermi GBM Final Real-time Localization
  61. GRB 220606B: Gemini South Optical Observations
  62. MAXI GRB220607.31: Global MASTER-Net observations report
  63. MAXI GRB220607.41: Global MASTER-Net observations report
  64. GRB 220606B: Fermi GBM Observation
  65. GRB 220606B: Swift follow-up observations
  66. Konus-Wind detection of GRB 220601A
  67. GRB 220606A: Swift/BAT-GUANO detection
  68. GRB 220606B: GUANO coordinate correction to GCN 32167
  69. GRB 220527A: A BdHN I with a clear UPE phase
  70. GRB 220606B: Swift ToO observations
  71. GRB 220606B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  72. Fermi GRB 220606B: Global MASTER-Net observations report
  73. GRB 220606B: Fermi GBM Final Real-time Localization
  74. GRB 220606A: Fermi GBM Final Real-time Localization
  75. IPN triangulation of GRB 220601A (long)
  76. Fermi trigger No 675992935: Global MASTER-Net observations report
  77. GRB 220603A: Swift/BAT-GUANO detection outside the coded FOV
  78. GRB 220527A: MITSuME Akeno continued optical observation
  79. GRB 220527A: Lick 3m Optical Observations
  80. Konus-Wind detection of GRB 220528A
  81. IPN triangulation of GRB 220528A (short)
  82. GRB 220528A: Fermi GBM Observation
  83. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  84. Fermi GRB 220530A: Global MASTER-Net observations report
  85. Konus-Wind observation of GRB 220527A
  86. GRB 220530A: Fermi GBM Final Real-time Localization
  87. Correction to GCN 32148: Should be GRB 220528A
  88. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  89. GRB 220528A: Fermi GBM Final Localization
  90. GRB 220527A: AST3-3 Yaoan Optical Observation
  91. GRB 220527A: REM optical/NIR observations
  92. GRB 220527A: VLT/X-shooter spectroscopic redshift
  93. GRB 220527A: MeerLICHT afterglow observations
  94. Fermi trigger No 675411172: Global MASTER-Net observations report
  95. GRB 220527A: NOT optical photometry and spectroscopic redshift
  96. GRB 220527A: AstroSat CZTI detection
  97. GRB 220527A: CALET Gamma-Ray Burst Monitor detection
  98. GRB 220527A: MITSuME Akeno optical observation
  99. LAT GRB220527.39: Global MASTER-Net observations report
  100. GRB 220527A: Swift/UVOT detection

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