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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"

23719 results found.

  1. GRB 061025: ROTSE-III Optical Limits
  2. GRB 061025: a long GRB detected by INTEGRAL
  3. Swift XRT boresight update
  4. GRB 061021 - VLT spectrum without lines
  5. GRB 061021: Swift/UVOT Observation
  6. GRB 061021, Swift-BAT refined analysis
  7. GRB060904b: optical observations
  8. GRB061019: optical observations
  9. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  10. GRB 061019: SMARTS afterglow confirmation
  11. GRB061019: Swift XRT refined analysis
  12. GRB 061019, Swift-BAT refined analysis
  13. GRB061019: Swift/XRT position
  14. GRB 060825: GORT Observations
  15. GRB 061007: RHESSI Spectral Fit
  16. GRB 061007: Suzaku/WAM observation of the prompt emission
  17. Konus-Wind observation of GRB 061007
  18. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  19. GRB061007: Swift UVOT followup observations
  20. GRB 061006 : Suzaku/WAM observation of the prompt emission
  21. GRB 061007: Swift-BAT refined analysis
  22. GRB 061006: Swift/UVOT optical observations
  23. GRB 061007 - FTS early brightening and power law decay
  24. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  25. GRB 061007: ROTSE-III Detection of Optical Counterpart
  26. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  27. GRB 061006: Swift-XRT Team Refined Analysis
  28. GRB 060930: near-IR afterglow candidate retraction
  29. GRB 061004: Swift-XRT Team Refined Analysis
  30. GRB 061004, Swift BAT refined analysis
  31. Konus-Wind observation of GRB 060928
  32. GRB 060928: Suzaku/WAM observation of the prompt emission
  33. GRB 060928: Swift observations
  34. GRB 060928: RHESSI Spectral Fit
  35. GRB 061002, Swift-BAT refined analysis
  36. GRB061002: MASTER-VWF-Kislovodsk observations
  37. GRB060930: Faulkes Telescope South observation
  38. GRB 060930: Xinglong TNT optical observations
  39. GRB 060929: Swift/UVOT Optical Observations
  40. GRB 060930: ROTSE-III Optical Limits
  41. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  42. GRB060929: Swift-XRT refined analysis.
  43. GRB 060929, Swift-BAT further refined analysis - late-time flare
  44. GRB 060929, Swift-BAT refined analysis
  45. GRB 060929: BART observation
  46. GRB 060929: MASTER-VWF-Kislovodsk observations
  47. GRB 060929: Swift detection of a burst
  48. GRB060908: optical observations
  49. GRB 060729: An update on the late-time Swift observations
  50. IBAS Alert n.3501: not a GRB
  51. IBAS Alert n.3500: not a GRB
  52. GRB060923C: optical limit
  53. GRB060927: optical observations
  54. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  55. GRB 060927: Early color
  56. GRB 060927, Swift-BAT refined analysis
  57. GRB 060927: Xinglong TNT optical observations
  58. GRB060927: Faulkes Telescope South observation
  59. GRB 060926: MASTER: first minutes decay
  60. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  61. GRB 060927: Swift detection of a burst
  62. GRB 060926: OPTIMA-Burst -- further observations
  63. GRB 060926: Swift XRT refined analysis
  64. GRB 060926, Swift-BAT refined analysis
  65. GRB 060926: MASTER OT alert observation
  66. GRB 060926: MASTER optical observation
  67. GRB 060923C, Swift-BAT refined analysis
  68. GRB060923C: AROMA optical obsevation
  69. GRB 060923C: Gemini Observations and Afterglow Candidate
  70. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  71. GRB060923B: Swift/UVOT upper limits
  72. GRB 060923C: Swift XRT refined analysis
  73. GRB 060923A: Keck and Gemini Observations
  74. GRB 060923B, Swift-BAT refined analysis
  75. GRB060923C: Faulkes Telescope North optical observations
  76. GRB 060923B: Swift detection of a burst
  77. GRB 060923, Swift-BAT refined analysis
  78. GRB060923: Faulkes Telescope North optical observations
  79. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  80. GRB 060919, Swift-BAT refined analysis
  81. GRB 060912A: Probable Host Galaxy
  82. IBAS Alert n.3470: not a GRB
  83. Konus-Wind observation of GRB 060912
  84. IBAS Alert No.3468: not a GRB
  85. GRB 060912B: a long GRB detected with INTEGRAL
  86. GRB 060912: Swift XRT Team Refined Analysis
  87. GRB 060912, Swift-BAT refined analysis
  88. GRB 060908, Swift-BAT refined analysis
  89. GRB 060904A : Optical limit
  90. GRB 060908: REM optical prompt observation
  91. GRB 060908: PROMPT Detection of a Bright Counterpart
  92. GRB 060904A: Suzaku/WAM observation of the prompt emission
  93. GRB060904b optical detections (delayed report due to internet outage)
  94. GRB 060906, Swift-BAT refined spectral analysis
  95. GRB 060906: Swift/XRT Refined Analysis
  96. VLT redshift of GRB 060906
  97. GRB 060906: observations with FRAM
  98. GRB 060906: Swift detection of a probable burst
  99. GRB 060904b: SMARTS optical/IR afterglow observations
  100. GRB 060904A: Subaru NIR observation

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