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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"

27649 results found.

  1. AXP 4U 0142+61: Fermi GBM detection
  2. GRB 110801A: TLS Optical afterglow confirmation
  3. GRB 110801A: ROTSE-III Detection of re-brightening from OT
  4. GRB 110801A: Swift detection of a burst with an optical counterpart
  5. GRB 110731A: Swift-XRT refined Analysis
  6. Konus-Wind observation of GRB 110731A
  7. GRB110731A: Swift/UVOT Observations
  8. GRB 110731A: Fermi GBM observation
  9. GRB 110731A: NOT photometry
  10. GRB 110731A: Swift-BAT refined analysis
  11. GRB 110731A: FTN+FTS afterglow observations
  12. GRB 110731A: Swift detection of a burst with an optical counterpart
  13. INTEGRAL Weak trigger #6331: GRT Optical Observation
  14. GRB 110721A: Swift observations of afterglow candidate
  15. AXP 4U 0142+61: Swift-BAT refined analysis
  16. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  17. Swift triggers 458268 and 458269 are not astrophysical
  18. GRB 110726A: Further Swift/UVOT Observations
  19. GRB 110726A: Swift-BAT refined analysis
  20. GRB 110726A: Swift/UVOT Detection
  21. GRB 110726A: Liverpool Telescope observations
  22. GRB 110726: ROTSE-III Detection of Optical Counterpart
  23. GRB 110726A: Swift detection of a burst
  24. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  25. GRB 110721A: potential counterpart candidate
  26. GRB 110721A: Fermi-LAT detection
  27. GRB 110721A: Fermi GBM detection
  28. Recent GCN/Swift-BAT Slew Burst Position notices are due to playback debugging
  29. GRB110715A: spectral lag analysis
  30. GRB 110715A : Suzaku WAM observation of the prompt emission
  31. GRB 110719A: GRT Optical Observation
  32. Swift/UVOT observations of GRB110719A
  33. Swift J1822.3-1606 : Fermi GBM observation
  34. GRB 110719A: Swift-XRT refined Analysis
  35. GRB 110719A: Swift-BAT refined analysis
  36. GRB 110719A: Swift detection of a burst
  37. GRB 110709B : Suzaku WAM observation of the prompt emission
  38. GRB 110715A: ATCA detection of the radio counterpart
  39. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  40. Konus-Wind observation of GRB 110715A
  41. GRB 110715A: Swift-XRT refined Analysis
  42. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  43. GRB 110715A: Swift/UVOT Detection
  44. GRB 110715A: Swift-BAT refined analysis
  45. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  46. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  47. GRB 110709B: Swift/UVOT Observations
  48. GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
  49. Swift trigger 457076 is not a GRB
  50. GRB 110709A: Suzaku WAM observation of the prompt emission
  51. IPN triangulation of GRB 110708B (long duration, extremely intense)
  52. Swift Trigger 457076: a possible GRB
  53. GRB 110709A: Swift/UVOT Upper Limits
  54. Fermi Gamma-ray Burst Monitor trigger 332078586 is not a GRB
  55. GRB 110709A: Konkoly observations
  56. GRB 110708A: Konkoly observations
  57. GRB 110709B BAT refined analysis
  58. GRB 110709B: burst detection from Swift-BAT slew data
  59. GRB 110709B: Swift-XRT refined Analysis
  60. GRB 110709A: Swift-XRT refined Analysis
  61. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  62. Konus-Wind observation of GRB 110709A
  63. Konus-Wind observation of GRB 110709B
  64. GRB110709A: upper limits from CAHA 1.23m and OSN 1.5m
  65. GRB 110709A: Fermi GBM observation
  66. GRB 110709B: Gemini-South additional analysis and photometry
  67. GRB 110709B: Preliminary Swift-BAT refined analysis
  68. GRB 110709B: GROND Detection of an Afterglow Candidate
  69. GRB 110709B: Gemini-South optical observations
  70. GRB 110709A: Swift-BAT refined analysis
  71. GRB 110709B: Swift detection of renewed activity at T+11 minutes.
  72. GRB 110709B: Swift detection of a burst
  73. GRB 110708A: Swift/UVOT Observations
  74. GRB 110709A: Swift detection of a burst
  75. GRB 110708A: Liverpool Telescope observations
  76. GRB 110708A: Lick observations
  77. GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst
  78. GRB 110705A: Suzaku WAM observation of the prompt emission
  79. Konus-Wind observation of GRB 110705A
  80. IPN triangulation of short hard GRB 110705A
  81. Swift trigger 456780 is not a burst
  82. GRB 110705A: Fermi GBM detection
  83. Swift Trigger 456659 is probably not astrophysical
  84. Swift-BAT trigger 456532 is not astrophysical
  85. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  86. SGR 1E 1841-045: Swift-BAT refined analysis
  87. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  88. GRB 110625A: Suzaku WAM observation of the prompt emission
  89. Swift J185003.2-005627: 1.23m CAHA and BOOTES-3 observations
  90. GRB 110625A: Fermi GBM and LAT observations
  91. GRB 110625A: Swift/UVOT Upper Limits
  92. GRB 110625A: 1.23m CAHA I-band observations
  93. GRB 110625A: Fermi LAT detection
  94. GRB 110625A: GROND detection of a source inside the XRT error circle
  95. GRB 110625A: Konkoly observations
  96. Konus-Wind observation of GRB 110625A
  97. GRB 110625A: Swift-XRT refined Analysis
  98. GRB 110625A: Swift-BAT refined analysis
  99. GRB 110625A: ROTSE-III Optical Limits
  100. GRB 110625A: Swift detection of a burst

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