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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"

35343 results found.

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

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