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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

26276 results found.

  1. GRB 061019: MITSuME upper limits
  2. GRB 061025: ROTSE-III Optical Limits
  3. GRB 061021, Swift-BAT Lag analysis
  4. Konus-Wind observation of GRB 061021
  5. GRB 061021: Swift-XRT refined analysis
  6. GRB 061021: Swift/UVOT Observation
  7. GRB 061021, Swift-BAT refined analysis
  8. GRB 061021: Swift detection of a burst
  9. GRB 061019: Super-LOTIS upper limit
  10. GRB 061019: SARA upper limit
  11. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  12. GRB 061019: Swift/UVOT upper limit
  13. GRB 061019, Swift-BAT refined analysis
  14. GRB 061019: TAROT La Silla observatory optical observations
  15. GRB061019: Swift/XRT position
  16. GRB 061019: Swift-BAT detection of a burst
  17. GRB 061007: Suzaku/WAM observation of the prompt emission
  18. Konus-Wind observation of GRB 061007
  19. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  20. GRB061007: Swift UVOT followup observations
  21. GRB 061006 : Suzaku/WAM observation of the prompt emission
  22. GRB 061007: Magellan Spectroscopy
  23. GRB 061007: Swift-BAT refined analysis
  24. GRB 061006: Swift/UVOT optical observations
  25. Konus-Wind observation of the short hard GRB 061006
  26. GRB 061007 - FTS early brightening and power law decay
  27. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  28. GRB 061007: Swift detection of a burst with an optical counterpart
  29. GRB 061007: ROTSE-III Detection of Optical Counterpart
  30. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  31. GRB 061006: Swift detection of a burst
  32. GRB061004: Swift/UVOT optical observations
  33. GRB 061004: Swift-XRT Team Refined Analysis
  34. GRB 061004, Swift BAT refined analysis
  35. GRB 061004: Swift detection of a burst
  36. GRB 060928: Suzaku/WAM observation of the prompt emission
  37. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  38. GRB 060928: Swift observations
  39. GRB 061002: Swift-XRT Team Refined Analysis
  40. GRB061002 - SDSS Pre-Burst Observations
  41. GRB 061002, Swift-BAT refined analysis
  42. GRB061002: MASTER-VWF-Kislovodsk observations
  43. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  44. GRB 061002: Swift detection of a burst
  45. GRB060930: Faulkes Telescope South observation
  46. GRB 060929: Swift/UVOT Optical Observations
  47. GRB 060930: ROTSE-III Optical Limits
  48. GRB060929: Swift-XRT refined analysis.
  49. GRB 060929, Swift-BAT refined analysis
  50. GRB 060929: MASTER-VWF-Kislovodsk observations
  51. Liverpool Telescope observations of GRB 060929
  52. GRB 060929: Swift detection of a burst
  53. GRB 060927: Swift/UVOT Optical Observations
  54. GRB 060927: Early color
  55. GRB 060927: Swift XRT Team refined analysis
  56. GRB 060927, Swift-BAT refined analysis
  57. GRB060927: Faulkes Telescope South observation
  58. GRB060927 - SDSS Pre-Burst Observations
  59. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  60. GRB 060927: Swift detection of a burst
  61. GRB 060926: Swift-UVOT Detections
  62. GRB 060926, Swift-BAT refined analysis
  63. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  64. GRB 060926: Swift detection of a burst
  65. GRB 060923C, Swift-BAT refined analysis
  66. GRB060923B: Swift/UVOT upper limits
  67. GRB 060923C, Swift-BAT partial refined analysis
  68. GRB 060923C: Keck Observations
  69. GRB 060923A: Keck and Gemini Observations
  70. GRB 060923B, Swift-BAT refined analysis
  71. GRB060923C : Faulkes Telescope South optical limits
  72. GRB060923C: Faulkes Telescope North optical observations
  73. GRB 060923C: optical observation
  74. GRB 060923C: Swift detection of a burst
  75. GRB 060923B: Swift detection of a burst
  76. GRB 060923, Swift-BAT refined analysis
  77. GRB 060923: Early Super-LOTIS Observations
  78. GRB060923: Faulkes Telescope North optical observations
  79. GRB060923 - SDSS Pre-Burst Observations
  80. GRB 060923: KAIT observations
  81. GRB 060923: Swift detection of a burst
  82. Swift detection of IGR J17497-2821 (trigger 230504)
  83. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  84. GRB 060919, Swift-BAT refined analysis
  85. GRB060919: XRT refined analysis
  86. GRB 060919: TAROT optical observations
  87. GRB 060919: Swift detection of a burst
  88. Konus-Wind observation of GRB 060912
  89. GRB060912: Swift/UVOT Observations
  90. GRB 060912: Swift XRT Team Refined Analysis
  91. GRB 060912, Swift-BAT refined analysis
  92. GRB 060912: Swift detection of a burst with an optical afterglow
  93. GRB 060908, Swift/XRT refined analysis
  94. GRB 060908: Swift/UVOT Observations
  95. GRB 060908: Danish/DFOSC optical observations
  96. GRB 060908, Swift-BAT refined analysis
  97. GRB 060908 - SDSS Pre-burst Observations
  98. GRB 060908: PROMPT Detection of a Bright Counterpart
  99. GRB 060908: Swift detection of a burst with a bright optical counterpart
  100. GRB 060904A: Suzaku/WAM observation of the prompt emission

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