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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

28231 results found.

  1. GRB 060515: TAROT optical observation
  2. GRB 060512: Subaru NIR observation
  3. GRB060512: Swift XRT Team refined analysis
  4. GRB 060512: 1.54m Kuiper Observations
  5. GRB 060512: Detection of NIR afterglow
  6. GRB 060512: P60 Observations
  7. GRB 060512: Swift-BAT Refined Analysis
  8. GRB 060512: REM NIR observations
  9. GRB060512 - SDSS Pre-Burst Observations
  10. GRB 060512: Swift detection of a burst with an optical afterglow
  11. GRB 060505: X-ray afterglow - Correction -
  12. GRB 060505: X-ray afterglow
  13. Konus-Wind observation of GRB 060510A
  14. GRB060418: optical observations
  15. GRB 060428a, SMARTS optical/IR afterglow detection
  16. GRB060510B: Swift XRT refined analysis
  17. GRB 060510A: Refined analysis of the Swift-BAT burst
  18. GRB 060510B: Swift-BAT Refined Analysis
  19. GRB060510A: XRT refined analysis
  20. GRB060510 - SDSS Pre-Burst Observations
  21. GRB 060510B: Swift detection of a burst
  22. GRB 060510: Swift detection of a burst with optical transient
  23. GRB060507: optical afterglow detection
  24. GRB060502B: improvement in the XRT afterglow position
  25. GRB 060507: Final Refined analysis of the Swift-BAT burst
  26. GRB 060507: Swift-BAT Refined Analysis
  27. GRB 060505: PROMPT Observations
  28. GRB 060507: Swift XRT Team Refined Analysis
  29. GRB 060507: Swift detection of a burst
  30. GRB 060429: Suzaku WAM observation
  31. GRB060505: Swift/UVOT Observations
  32. GRB060425: new MASTER survey method
  33. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  34. GRB 060505: Swift XRT afterglow canditate position
  35. GRB 060502b: Second epoch Gemini observations
  36. GRB 060505: Swift-BAT detection of a weak burst
  37. GRB 060428B: spectroscopy
  38. GRB 060502B: optical observations
  39. GRB 060502B: AROMA refined photometric calibration
  40. GRB 060502B MDM Follow-up Observation
  41. GRB 060502b: Gemini imaging and spectroscopy
  42. GRB060502A, optical observation
  43. GRB 060502B: Swift/UVOT upper limits
  44. GRB 060502A: Swift/UVOT source detection
  45. GRB 060502B: MDM Optical Observation
  46. GRB 060502B: Refined analysis of the Swift-BAT short burst
  47. GRB060502B: Swift XRT Team refined analysis
  48. GRB 060501: P60 Observations and Candidate Retraction
  49. GRB 060502B: Xinglong optical observation
  50. GRB060502: Swift-XRT refined analysis
  51. GRB 060502: Swift-BAT refined analysis
  52. GRB060501: Swift UVOT followup observations
  53. GRB 060502: P60 Afterglow Confirmation
  54. GRB 060502: Swift detection of a burst with an optical counterpart
  55. GRB060501: P60 imaging and afterglow candidate
  56. GRB 060501: Refined analysis of the Swift-BAT burst
  57. GRB060428B - SDSS Pre-Burst Observations
  58. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  59. GRB 060428B: MDM Observations
  60. GRB060428B: Swift XRT Team refined analysis
  61. GRB 060427B: IPN localization of a short hard burst
  62. GRB 060428B: Refined analysis of the Swift-BAT burst
  63. GRB 060428B: Xinglong I-band limit
  64. GRB 051117A: Bright host galaxy not confirmed
  65. GRB060428A: Swift/UVOT observations.
  66. GRB060428B, optical observation
  67. GRB 060428A: Refined analysis of the Swift-BAT burst
  68. GRB 060428b : Kiso R-band limit
  69. GRB 060428b: Optical afterglow candidate
  70. GRB060428A: Swift XRT Team refined analysis
  71. GRB 060428B: Swift detection of a burst
  72. GRB 060427: NIR observations
  73. GRB060427: Xinglong optical Observations
  74. GRB 060428: Swift detection of a burst
  75. GRB 060427: Swift/UVOT upper limits.
  76. GRB 060427: Refined analysis of the Swift-BAT burst
  77. GRB060427: Swift XRT Team refined analysis
  78. GRB060418: Swift XRT Team Further Refined Analysis
  79. GRB060425:MASTER survey observations
  80. GRB 060427, optical observation
  81. GRB 060427: Swift detection of a burst
  82. GRB060418: Further Analysis of MIKE Spectroscopy
  83. GRB 060424: Refined analysis of the Swift-BAT burst
  84. GRB 060421: TTT Observations
  85. GRB060421: Swift/UVOT observations
  86. GRB 060421: Swift-BAT Refined Analysis
  87. GRB 060421: Swift-XRT refined analysis
  88. GRB 060418: prediction of t_break
  89. GRB(?) 060421: Swift detection of a burst
  90. Erratum of GCN 4983 for GRB 060418 IR follow-up
  91. GRB 060418 : IR afterglow observations
  92. GRB 060418: Radio Observations
  93. GRB060418, BVRcIc field calibration
  94. GRB060418: Swift/UVOT Observations
  95. GRB060418: Optical Observations
  96. GRB 060418: Refined Analysis of the Swift-BAT burst
  97. GRB 060418, SMARTS continuing afterglow observations
  98. GRB 060418, SMARTS optical/IR afterglow observations
  99. GRB060418 : LT optical afterglow observation
  100. GRB 060418: REM candidate afterglow

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