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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"

28289 results found.

  1. GRB 110726A: Swift/UVOT Detection
  2. GRB 110726A: Liverpool Telescope observations
  3. GRB 110726: ROTSE-III Detection of Optical Counterpart
  4. GRB 110726A: Swift detection of a burst
  5. IPN triangulation of GRB 110721A
  6. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  7. GRB 110721A: potential counterpart candidate
  8. GRB 110721A: Fermi-LAT detection
  9. GRB 110721A: Fermi GBM detection
  10. GRB 110715A : Suzaku WAM observation of the prompt emission
  11. GRB 110719A: GRT Optical Observation
  12. GRB 110719A: optical limit by "Pi of the Sky"
  13. GRB 110719A: z-band upper limit
  14. Swift/UVOT observations of GRB110719A
  15. GRB 110719A: Swift-XRT refined Analysis
  16. GRB 110719A: optical upper limit
  17. GRB 110719A: Enhanced Swift-XRT position
  18. GRB 110719A: Swift-BAT refined analysis
  19. GRB 110719A: Swift detection of a burst
  20. GRB 110709B : Suzaku WAM observation of the prompt emission
  21. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  22. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  23. GRB 110715A: APEX detection of the submm counterpart
  24. GRB 110715A: Swift-XRT refined Analysis
  25. GRB 110715A: Swift/UVOT Detection
  26. GRB 110715A: Enhanced Swift-XRT position
  27. GRB 110715A: Swift-BAT refined analysis
  28. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  29. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  30. GRB 110709B: Swift/UVOT Observations
  31. GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
  32. Swift trigger 457076 is not a GRB
  33. GRB 110709A: Suzaku WAM observation of the prompt emission
  34. GRB 110709B: Submm observations from APEX
  35. IPN triangulation of GRB 110708B (long duration, extremely intense)
  36. Swift Trigger 457076: a possible GRB
  37. GRB 110709A: Swift/UVOT Upper Limits
  38. GRB 110709A: Konkoly observations
  39. GRB 110708A: Konkoly observations
  40. GRB 110709B BAT refined analysis
  41. GRB 110709B: burst detection from Swift-BAT slew data
  42. GRB 110709B: Swift-XRT refined Analysis
  43. GRB 110709A: Swift-XRT refined Analysis
  44. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  45. GRB110709A: MITSuME Ishigakijima Optical upper limits
  46. GRB 110709B: Enhanced Swift-XRT position
  47. GRB 110709B: Gemini-South additional analysis and photometry
  48. GRB 110709B: Preliminary Swift-BAT refined analysis
  49. GRB 110709B: GROND Detection of an Afterglow Candidate
  50. GRB 110709B: Gemini-South optical observations
  51. GRB 110709A: Swift-BAT refined analysis
  52. GRB 110709B: possible quiescent source in DSS
  53. GRB 110709B: Swift detection of renewed activity at T+11 minutes.
  54. GRB 110709A: Enhanced Swift-XRT position
  55. GRB 110709B: Swift detection of a burst
  56. GRB 110708A: Swift/UVOT Observations
  57. GRB 110709A: Swift detection of a burst
  58. GRB 110708A: Liverpool Telescope observations
  59. GRB 110708A: Lick observations
  60. GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst
  61. GRB 110705A: Suzaku WAM observation of the prompt emission
  62. GRB 110625A, the review of the sky area in plate archives
  63. IPN triangulation of short hard GRB 110705A
  64. Swift trigger 456780 is not a burst
  65. GRB 110705A: Fermi GBM detection
  66. Swift Trigger 456659 is probably not astrophysical
  67. Swift-BAT trigger 456532 is not astrophysical
  68. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  69. SGR 1E 1841-045: Swift-BAT refined analysis
  70. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  71. GRB 110625A: Suzaku WAM observation of the prompt emission
  72. Swift J185003.2-005627: 1.23m CAHA and BOOTES-3 observations
  73. GRB 110625A: Fermi GBM and LAT observations
  74. GRB 110625A: Swift/UVOT Upper Limits
  75. GRB 110625A: 1.23m CAHA I-band observations
  76. GRB 110625A: Fermi LAT detection
  77. GRB 110625A: GROND detection of a source inside the XRT error circle
  78. GRB 110625A: Konkoly observations
  79. GRB 110625A: Swift-XRT refined Analysis
  80. GRB 110625A: Swift-BAT refined analysis
  81. Swift J185003.2-005627: NIR Observation
  82. GRB 110625A: Swift detection of a burst
  83. Swift J185003.2-005627: Swift-XRT/UVOT refined analysis
  84. Swift J185003.2-005627: Swift-BAT refined analysis
  85. Swift J185003.2-005627: TAROT La Silla observatory optical observations
  86. Swift J185003.2-005627: TAROT Calern observatory optical observations
  87. Swift J185003.2-005627: Swift detection of a burst from a new Galactic transient
  88. SGR 1E 1841-045: Swift-BAT refined analysis
  89. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  90. IPN triangulation of GRB110618A (long duration, extremely intense)
  91. GRB 110604A: Suzaku WAM observation of the prompt emission
  92. GRB 110610A: Suzaku WAM observation of the prompt emission
  93. GRB 110610A: Fermi GBM detection
  94. GRB 110610A: 1.23m CAHA optical observations
  95. GRB 110610A: Swift-XRT refined Analysis
  96. GRB 110610A: Swift/UVOT Upper Limits
  97. GRB 110610A: Enhanced Swift-XRT position
  98. GRB 110610A: Swift-BAT refined analysis
  99. Swift detection of the X-ray afterglow of GRB 110604A
  100. GRB 110610A: Swift detection of a burst

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