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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"
  1. GRB 060510B : Planned XMM-Newton observation
  2. GRB 060510b: Gemini NIR observations
  3. GRB 060510B: Super-LOTIS Observations
  4. GRB 060510b: NIR observations
  5. GRB 060510B: Coordinate correction
  6. GRB 060510B: MDM Observations and candidate OT
  7. GRB 060510B: Swift detection of a burst
  8. GRB 060510: Swift detection of a burst with optical transient
  9. GRB060507: optical afterglow detection
  10. GRB060502B: improvement in the XRT afterglow position
  11. GRB 060507: BART limit
  12. GRB 060507: Final Refined analysis of the Swift-BAT burst
  13. GRB 060507: Swift-BAT Refined Analysis
  14. GRB 060505: PROMPT Observations
  15. GRB 060507: Swift/UVOT Upper Limits
  16. GRB 060507: Swift XRT Team Refined Analysis
  17. GRB 060507: MDM Optical Upper Limit
  18. GRB060507: Swift XRT position
  19. GRB 060507: Swift detection of a burst
  20. GRB 060429: Suzaku WAM observation
  21. GRB060505: Swift/UVOT Observations
  22. GRB 060505: Swift XRT Team Refined Analysis
  23. GRB060425: new MASTER survey method
  24. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  25. GRB 060505: Swift XRT afterglow canditate position
  26. GRB 060502b: Second epoch Gemini observations
  27. GRB 060505: Swift-BAT detection of a weak burst
  28. GRB 060428B: spectroscopy
  29. GRB 060502B: optical observations
  30. GRB 060502B: AROMA refined photometric calibration
  31. GRB 060502B MDM Follow-up Observation
  32. GRB 060502b: Gemini imaging and spectroscopy
  33. GRB060502A, optical observation
  34. GRB 060502B: Swift/UVOT upper limits
  35. GRB 060502A: Swift/UVOT source detection
  36. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  37. GRB 060502B: MDM Optical Observation
  38. GRB 060502B: AROMA optical observations
  39. GRB 060502B: Refined analysis of the Swift-BAT short burst
  40. GRB060502B: Swift XRT Team refined analysis
  41. Short GRB 060502B: Tautenburg Observation
  42. GRB 060427B Milagro GeV/TeV Observations
  43. GRB 060502A: TTT Observations
  44. GRB060502B: correction to XRT position
  45. GRB 060501: P60 Observations and Candidate Retraction
  46. GRB 060502B: Xinglong optical observation
  47. GRB 060502B: MASTER optical observations
  48. GRB 060502B: Swift detection of a short burst
  49. GRB060502: Swift-XRT refined analysis
  50. GRB 060502: Swift-BAT refined analysis
  51. GRB060502: Gemini spectroscopy
  52. GRB 060502: APO Spectroscopic Observations
  53. GRB060501: Swift UVOT followup observations
  54. GRB060502: Super-LOTIS Observations
  55. GRB 060502: P60 Afterglow Confirmation
  56. GRB 060502: Swift detection of a burst with an optical counterpart
  57. GRB 060501: MDM Observations
  58. GRB060501: Super-LOTIS observations
  59. GRB060501: P60 imaging and afterglow candidate
  60. GRB 060501: Refined analysis of the Swift-BAT burst
  61. GRB060501: Swift XRT position
  62. GRB 060501: ROTSE-III Optical Limits
  63. GRB 060501: Swift detection of a burst
  64. IPN triangulation of GRB060429 (short/hard)
  65. Konus-Wind observation of GRB 060427B
  66. GRB060428B - SDSS Pre-Burst Observations
  67. GRB060428B: optical observation
  68. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  69. GRB 060428B: MDM Observations
  70. GRB 060428A: PROMPT Observations
  71. GRB 060427B: MASTER optical observations
  72. GRB060428B: Swift XRT Team refined analysis
  73. GRB 060427B: IPN localization of a short hard burst
  74. GRB 060428B: Refined analysis of the Swift-BAT burst
  75. GRB 060428B: Xinglong I-band limit
  76. GRB 060428B: KAIT observations
  77. GRB060425:MASTER optical limit
  78. GRB 051117A: Bright host galaxy not confirmed
  79. GRB060428A: Swift/UVOT observations.
  80. GRB060428B, optical observation
  81. GRB 060428A: Refined analysis of the Swift-BAT burst
  82. GRB 060428b : Kiso R-band limit
  83. GRB060427:MASTER optical limit
  84. GRB 060428b: Optical afterglow candidate
  85. GRB060428A: Swift XRT Team refined analysis
  86. GRB 060428B: Swift detection of a burst
  87. GRB 060427: NIR observations
  88. GRB060427: Xinglong optical Observations
  89. GRB 060428: Swift detection of a burst
  90. GRB 060427: NOT observations
  91. GRB 060427: Swift/UVOT upper limits.
  92. GRB 060427: Refined analysis of the Swift-BAT burst
  93. GRB060427: Swift XRT Team refined analysis
  94. GRB060418: Swift XRT Team Further Refined Analysis
  95. GRB060425:MASTER survey observations
  96. GRB 060427, optical observation
  97. GRB 060427: Swift detection of a burst
  98. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  99. An interactive program for GRB pseudo-redshift computations
  100. GRB060424: optical afterglow detection

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