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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"

26511 results found.

  1. GRB 081102: MASTER prompt optical limit
  2. GRB 081102: Swift-XRT refined analysis
  3. GRB 081102: Swift-BAT refined analysis
  4. GRB 081102: Enhanced Swift-XRT position
  5. Radio observation of GRB 080218b with ATCA
  6. Radio observation of GRB 080229a with ATCA
  7. GRB 081102: Swift detection of a burst
  8. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  9. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  10. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  11. GRB 081024B: BTA deep optical observations
  12. Radio observation of GRB 080229b with ATCA
  13. GRB 081024B: VLA radio observation
  14. GRB 081029: Swift-BAT refined analysis
  15. GRB081029: Swift XRT refined analysis
  16. GRB 081025: Suzaku WAM observation of the prompt emission
  17. GRB 081024B: Suzaku WAM observation of the prompt emission
  18. GRB 081029: Enhanced Swift-XRT position
  19. GRB 081029: REM observations
  20. Radio observation of GRB 080303 with ATCA
  21. Radio observation of GRB 080411 with ATCA
  22. GRB 081029: UVES/VLT Absorption Redshift
  23. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  24. GRB 081029: Swift detection of a burst
  25. GRB 081028B: Fermi GBM detection
  26. GRB 081021: Fermi GBM detection
  27. GRB 081028: Swift-XRT refined analysis
  28. GRB 081028, Swift-BAT refined analysis
  29. GRB 081028: Enhanced Swift-XRT position
  30. GRB 081028: TAROT Calern observatory optical observations
  31. GRB 081028: optical observations at the NOT
  32. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  33. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  34. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  35. GRB 081028: Swift detection of a burst
  36. GRB 081024: No radio detection with the VLA
  37. GRB 081025 BAT refined analysis
  38. Konus-Wind observation of GRB 081025
  39. GRB 081025: Burst detection from Swift-BAT slew data
  40. GRB 081024B: Fermi Gamma-ray Burst Monitor detection
  41. Fermi-LAT observation of GRB 081024B
  42. GRB 081024: Swift-XRT refined analysis
  43. GRB 081024, Swift-BAT refined analysis
  44. GRB 081024: Enhanced Swift-XRT position
  45. GRB 081024: Swift detection of a burst
  46. GRB 081022, Swift-BAT refined analysis
  47. GRB 081022: Swift detection of a burst
  48. GRB 081012: Swift-XRT Refined Analysis
  49. Swift detection of a possible burst (trigger 332287)
  50. GRB 081012 - Enhanced Swift XRT position
  51. GRB 081017, Swift-BAT refined analysis
  52. GRB 081017: Swift detection of a burst
  53. GRB 081016B, Swift-BAT refined analysis
  54. GRB 081011: Swift XRT refined analysis
  55. GRB 081016B: Swift-XRT Team refined Analysis
  56. GRB 081016B: Enhanced Swift-XRT position
  57. GRB 081016B: Swift detection of a burst
  58. GRB 081011: Enhanced Swift-XRT position
  59. GRB 081016: A long GRB discovered by INTEGRAL
  60. Detection of flare star Algol in Swift-BAT slew data
  61. GRB 081009: Fermi GBM detection
  62. GRB 081012: GROND upper limits
  63. GRB 081012: Fermi GBM detection
  64. GRB 081007 and GRB 081007B: Fermi GBM detection
  65. GRB 080430: optical observations
  66. GRB 081008 optical upper limit
  67. GRB 081012: Observations from NOT
  68. GRB 081012, Swift-BAT refined analysis
  69. GRB 081012: ROTSE-III Optical Limits
  70. GRB 081012: Swift detection of a burst
  71. GRB 081011, Swift-BAT refined analysis
  72. GRB 081011: Swift detection of a burst
  73. GRB 081007: Radio Detection
  74. Konus-Wind observation of GRB 081001
  75. GRB 081008, Swift-BAT refined analysis
  76. GRB 081008: VLT redshift confirmation
  77. GRB 081008: Swift-XRT Refined Analysis
  78. GRB081008: Swift/UVOT observations
  79. GRB 081008: Enhanced Swift-XRT position
  80. GRB 081008: Gemini-South Absorption Redshiftt
  81. GRB 081008: Swift detection of a burst with optical afterglow
  82. GRB081006B: Fermi GBM detection
  83. GRB081006: Fermi GBM detection
  84. GRB 081007, Swift-BAT refined analysis
  85. GRB 081007: Early RAPTOR measurements of optical counterpart
  86. GRB 081007: Swift-XRT Team refined analysis
  87. GRB 081007: Enhanced Swift-XRT position
  88. GRB 081007, Faulkes Telescope North optical observations
  89. GRB 081007, SMARTS optical/IR afterglow observations
  90. GRB 081007: Swift detection of a burst with optical afterglow
  91. GRB081003C: GLAST Burst Monitor detection
  92. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  93. GRB 081003B: TAROT Calern observatory optical observations
  94. GRB 081003A: OSN optical observations
  95. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  96. GRB 081003A: Swift-XRT Team position and analysis
  97. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  98. GRB 081003B: a long GRB detected with INTEGRAL
  99. GRB 080928: Fermi GBM detection
  100. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection

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