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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"

41710 results found.

  1. GRB 060210: Jet Break in the XRT light curve
  2. GRB 060516: Refined analysis of the Swift-BAT burst
  3. GRB 060516: Swift detection of a burst
  4. GRB060515: P200 NIR Observations
  5. GRB 060505 BAT refined analysis
  6. GRB 060515 BAT refined analysis
  7. GRB 060512: TAROT optical observation
  8. GRB 060515: Swift/XRT Team refined analysis
  9. GRB 060515: Swift/UVOT Upper Limits
  10. GRB 060515: Swift/XRT position
  11. GRB 060515: Super-LOTIS Observations
  12. GRB060515: Swift/UVOT initial observation
  13. GRB 060515: TAROT optical observation
  14. GRB 060515: ROTSE-III Optical Limits
  15. GRB 060515: Swift detection of a burst
  16. VLT optical spectroscopy of GRB 060512
  17. Swift/UVOT observations of GRB060512.
  18. GRB 060512: Subaru NIR observation
  19. GRB060512: Swift XRT Team refined analysis
  20. GRB 060512: 1.54m Kuiper Observations
  21. GRB 060512: Detection of NIR afterglow
  22. GRB 060512: P60 Observations
  23. GRB 060505 - OT candidate + galaxy spectrum
  24. GRB 060512: optical decay
  25. GRB 060512: REM NIR observations
  26. GRB060512 - SDSS Pre-Burst Observations
  27. GRB060512 Name Correction: LT Afterglow detection
  28. GRB060512: Liverpool Telescope Afterglow detection
  29. GRB 060512: Swift detection of a burst with an optical afterglow
  30. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  31. Konus-Wind observation of GRB 060510A
  32. GRB060418: optical observations
  33. GRB 060428a, SMARTS optical/IR afterglow detection
  34. GRB060510B: Swift XRT refined analysis
  35. GRB 060510B: Swift-BAT Refined Analysis
  36. GRB060510A: XRT refined analysis
  37. GRB060510 - SDSS Pre-Burst Observations
  38. GRB060510B : Faulkes North Telescope detection
  39. GRB 060510b: Gemini NIR observations
  40. GRB 060510B: Super-LOTIS Observations
  41. GRB 060510b: NIR observations
  42. GRB 060510B: Coordinate correction
  43. GRB 060510B: MDM Observations and candidate OT
  44. GRB 060510B: Swift detection of a burst
  45. GRB 060510: Swift detection of a burst with optical transient
  46. GRB060507: optical afterglow detection
  47. GRB060502B: improvement in the XRT afterglow position
  48. GRB 060507: BART limit
  49. GRB 060507: Swift-BAT Refined Analysis
  50. GRB 060505: PROMPT Observations
  51. GRB 060507: Swift/UVOT Upper Limits
  52. GRB 060507: Swift XRT Team Refined Analysis
  53. GRB 060507: MDM Optical Upper Limit
  54. GRB060507: Swift XRT position
  55. GRB 060507: Swift detection of a burst
  56. GRB 060429: Suzaku WAM observation
  57. GRB060505: Swift/UVOT Observations
  58. GRB 060505: Swift XRT Team Refined Analysis
  59. GRB060425: new MASTER survey method
  60. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  61. GRB 060505: Swift XRT afterglow canditate position
  62. GRB 060502b: Second epoch Gemini observations
  63. GRB 060505: Swift-BAT detection of a weak burst
  64. GRB 060502B: optical observations
  65. GRB 060502B: AROMA refined photometric calibration
  66. GRB 060502B MDM Follow-up Observation
  67. GRB 060502b: Gemini imaging and spectroscopy
  68. GRB060502A, optical observation
  69. GRB 060502B: Swift/UVOT upper limits
  70. GRB 060502A: Swift/UVOT source detection
  71. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  72. GRB 060502B: MDM Optical Observation
  73. GRB 060502B: Refined analysis of the Swift-BAT short burst
  74. Short GRB 060502B: Tautenburg Observation
  75. GRB 060427B Milagro GeV/TeV Observations
  76. GRB 060502A: TTT Observations
  77. GRB 060501: P60 Observations and Candidate Retraction
  78. GRB 060502B: Xinglong optical observation
  79. GRB 060502B: MASTER optical observations
  80. GRB 060502B: Swift detection of a short burst
  81. GRB060502: Swift-XRT refined analysis
  82. GRB 060502: Swift-BAT refined analysis
  83. GRB060502: Gemini spectroscopy
  84. GRB 060502: APO Spectroscopic Observations
  85. GRB060502: Super-LOTIS Observations
  86. GRB 060502: P60 Afterglow Confirmation
  87. GRB 060502: Swift detection of a burst with an optical counterpart
  88. GRB 060501: MDM Observations
  89. GRB060501: Super-LOTIS observations
  90. GRB060501: P60 imaging and afterglow candidate
  91. GRB 060501: Refined analysis of the Swift-BAT burst
  92. GRB060501: Swift XRT position
  93. GRB 060501: Swift detection of a burst
  94. IPN triangulation of GRB060429 (short/hard)
  95. Konus-Wind observation of GRB 060427B
  96. GRB060428B - SDSS Pre-Burst Observations
  97. GRB060428B: optical observation
  98. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  99. GRB 060428B: MDM Observations
  100. GRB 060428A: PROMPT Observations

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