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"

19663 results found.

  1. Swift GRB221204.45 AKO Upper Limit
  2. Swift GRB221204.45: Global MASTER-Net observations report
  3. GRB 221202A: Swift/UVOT Detection
  4. GRB 221202A: Swift-BAT refined analysis
  5. GRB 221202A: VLT/FORS2 Afterglow Discovery
  6. GRB 221201A: Swift-BAT refined analysis
  7. GRB 221201A: Fermi GBM observation
  8. GRB 221202A: Swift-XRT refined Analysis
  9. GRB 221202A: Enhanced Swift-XRT position
  10. GRB 221202A: MeerLICHT upper limits
  11. GRB 221202A: Swift detection of a burst
  12. Swift GRB221202.84: Global MASTER-Net observations report
  13. GCN: GRB 221201A: Swift/UVOT Upper Limits
  14. GRB 221201A: Swift-XRT refined Analysis
  15. GRB 221201A: Enhanced Swift-XRT position
  16. Swift GRB 221201A: Global MASTER-Net observations report
  17. Konus-Wind detection of GRB 221124A
  18. GRB 221201A: Swift detection of a burst
  19. GRB 221126A: Fermi GBM observation
  20. GRB 221126A: AGILE detection
  21. GRB 221126A: AstroSat CZTI detection
  22. GRB 221126A: Swift/BAT-GUANO detection outside the coded FOV
  23. IPN triangulation of GRB 221124A (long)
  24. GRB 221124A: Swift/BAT-GUANO detection
  25. GRB 221120A: Detection by VZLUSAT-2
  26. GRB 221009A：DAMPE observed a 34.7 GeV photon at 1.36 hour after the GBM trigger
  27. IPN triangulation of GRB 221121A (long)
  28. GRB 221120A: Swift-BAT refined analysis
  29. GRB 221120A: AKO Telescope Upper Limits
  30. GRB221120A: WIRC near-IR imaging of the afterglow candidate
  31. GRB 221120A: Liverpool Telescope Upper Limits
  32. GRB 221120A: Fermi GBM observation
  33. GRB 221120A: Swift-XRT refined Analysis
  34. GRB 221120A: Enhanced Swift-XRT position
  35. GRB221120A: Montarrenti Observatory Upper Limit
  36. GRB 221120A is a short burst
  37. GRB 221120A: Swift/UVOT Upper Limits
  38. GRB 221120A: GIT upper limits on optical afterglow
  39. GRB 221120A: Swift detection of a likely short burst
  40. GRB 221119A: Fermi-LAT detection
  41. GRB 221009A: Japanese VLBI Network observation
  42. GRB 221115B: CALET Gamma-Ray Burst Monitor detection
  43. Correction to GCN 32646 (GRB 221009A (Swift J1913.1+1946): MeerLICHT observations)
  44. GRB 221115B : MeerLICHT upper limits
  45. GRB 221115A: Fermi GBM detection
  46. GRB 221115B: Swift/BAT-GUANO arcminute localization
  47. GRB 221115A: Swift/BAT-GUANO detection
  48. GRB 221110A: GRANDMA observations
  49. GRB 221009A: GRANDMA/Kilonova-Catcher observations
  50. GRB 221110A: Swift/UVOT Detection and Corrected UVOT Position
  51. GRB 221110A: Swift-BAT refined analysis
  52. GRB 221110A: Swift-XRT refined Analysis
  53. GRB 221110A: Enhanced Swift-XRT position
  54. GRB 221110A: LCOGT Optical Afterglow Detection
  55. GRB 221110A: Swift detection of a burst with an optical counterpart
  56. Swift GRB221110.10: Global MASTER-Net OT detection
  57. Swift GRB221110.10: Global MASTER-Net observations report
  58. GRB 221107A: Fermi GBM Observation
  59. GRB 221107A: Detection by GRBAlpha
  60. GRB 221107A: Swift/BAT-GUANO detection outside the coded FOV
  61. Correction to GCN 32852 (GRB 221009A: SARA-RM 1m Optical Afterglow Detection)
  62. GRB 221029A: CALET Gamma-Ray Burst Monitor detection
  63. High-precision position of the compact radio counterpart to GRB221009A
  64. GRB 221028A: GRANDMA observations
  65. GRB 221027B: GRANDMA observations
  66. GRB 221028A: Detection by VZLUSAT-2
  67. GRB 221028A: Swift-XRT refined Analysis
  68. GRB 221028A: 1.3m DFOT Optical upper limit
  69. GRB 221028A, Swift-BAT refined analysis
  70. GRB 221027B: Swift-BAT refined analysis
  71. GRB 221029A: Swift/BAT-GUANO detection outside the coded FOV
  72. Trigger 1132968: Swift trigger is the Crab
  73. GRB 221028A: HCT optical upper limit
  74. GRB 221028A: AGILE detection
  75. GRB 221028A: MITSuME Okayama optical upper limits
  76. Swift GRB 221028A: Global MASTER-Net observations report
  77. GRB 221028A: BOOTES-4/MET optical upper limit
  78. GRB 221028A: GIT optical upper limit
  79. GRB 221027B: Swift/UVOT Upper Limits
  80. GRB 221028A: Swift detection of a burst
  81. GRB 221027B: FRAM-ORM and Ondrejov SBT optical limits
  82. Swift GRB 221027B: Global MASTER-Net observations report
  83. GRB 221027B: Swift-XRT refined Analysis
  84. GRB 221027B: BOOTES-1 optical upper limit
  85. GRB 221027B: Enhanced Swift-XRT position
  86. GRB 221027B: Swift detection of a burst
  87. Konus-Wind detection of GRB 221022B
  88. GRB 221024A: Mondy optical observations
  89. GRB 221027A: Fermi-LAT detection
  90. GRB 221024A: GRANDMA observations
  91. IPN triangulation of GRB 221022C (short)
  92. GRB 221024A: Swift-BAT refined analysis
  93. GRB 221009A: SARA-RM 1m Optical Afterglow Detection
  94. GRB 221024A: Swift/UVOT UV upper limits
  95. GRB 221022A: Swift-XRT observations
  96. GRB 221024A: Swift-XRT refined Analysis
  97. GRB 221022B: Detection by GRBAlpha
  98. GRB 221025A: Fermi-LAT detection
  99. IPN triangulation of GRB 221022B (long)
  100. GRB 221024A: GIT confirmation of the optical afterglow

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