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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"

31744 results found.

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

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