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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"

26272 results found.

  1. GRB 060211A : WIDGET simultaneous optical observations
  2. GRB060602A: optical observations(/transient?)
  3. GRB 060602B: Swift detection of a burst
  4. GRB060602B: BOOTES-IR candidate afterglow
  5. GRB060602 - SDSS Pre-Burst Observations
  6. GRB 060502A: Optical afterglow observations
  7. GRB 060526: Break in X-ray light curve
  8. GRB060526, optical observations
  9. GRB 051227 : WIDGET simultaneous optical observations
  10. GRB 051028 : WIDGET pre-trigger limit
  11. GRB060526: Optical counterpart from MIRO
  12. GRB 060526: RTT150 optical observations
  13. GRB060526: optical observations
  14. GRB 060526: REM observations
  15. GRB 060526: RTT150 optical observations, afterglow flattening
  16. GRB 060526: MDM-2.4m Observations
  17. GRB 060526: Refined analysis of the Swift-BAT burst
  18. GRB 060526: RTT150 optical observations
  19. GRB060526, optical observations
  20. GRB 060526: Swift/XRT Team refined analysis
  21. GRB 060526: ROTSE-III Observations of Optical Counterpart
  22. GRB 060526: Watcher Observations
  23. GRB060526 - SDSS Pre-burst Observations
  24. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  25. GRB 060413 : WIDGET simultaneous optical observations
  26. XMM-Newton observation of GRB060510b
  27. GRB060512: Late-Time P200 Observations
  28. GRB 060522: Swift-BAT Refined Analysis
  29. GRB 060522: REM NIR observations
  30. GRB 060522: TNG optical observations
  31. GRB 060515: NIR observation
  32. GRB 060210: Jet Break in the XRT light curve
  33. GRB 060516: Refined analysis of the Swift-BAT burst
  34. GRB060515: P200 NIR Observations
  35. GRB 060505 BAT refined analysis
  36. GRB 060515 BAT refined analysis
  37. GRB 060512: TAROT optical observation
  38. GRB 060515: Swift/XRT Team refined analysis
  39. GRB 060515: Swift/UVOT Upper Limits
  40. GRB 060515: Swift/XRT position
  41. GRB 060515: Super-LOTIS Observations
  42. GRB 060515: TAROT optical observation
  43. GRB 060512: Subaru NIR observation
  44. GRB060512: Swift XRT Team refined analysis
  45. GRB 060512: 1.54m Kuiper Observations
  46. GRB 060512: Detection of NIR afterglow
  47. GRB 060512: P60 Observations
  48. GRB 060512: Swift-BAT Refined Analysis
  49. GRB 060512: REM NIR observations
  50. GRB060512 - SDSS Pre-Burst Observations
  51. GRB 060512: Swift detection of a burst with an optical afterglow
  52. GRB 060505: X-ray afterglow - Correction -
  53. GRB 060505: X-ray afterglow
  54. Konus-Wind observation of GRB 060510A
  55. GRB060418: optical observations
  56. GRB 060428a, SMARTS optical/IR afterglow detection
  57. GRB060510B: Swift XRT refined analysis
  58. GRB 060510A: Refined analysis of the Swift-BAT burst
  59. GRB 060510B: Swift-BAT Refined Analysis
  60. GRB060510A: XRT refined analysis
  61. GRB060510 - SDSS Pre-Burst Observations
  62. GRB 060510B: Swift detection of a burst
  63. GRB 060510: Swift detection of a burst with optical transient
  64. GRB060507: optical afterglow detection
  65. GRB060502B: improvement in the XRT afterglow position
  66. GRB 060507: Final Refined analysis of the Swift-BAT burst
  67. GRB 060507: Swift-BAT Refined Analysis
  68. GRB 060505: PROMPT Observations
  69. GRB 060507: Swift XRT Team Refined Analysis
  70. GRB 060507: Swift detection of a burst
  71. GRB 060429: Suzaku WAM observation
  72. GRB060505: Swift/UVOT Observations
  73. GRB060425: new MASTER survey method
  74. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  75. GRB 060505: Swift XRT afterglow canditate position
  76. GRB 060502b: Second epoch Gemini observations
  77. GRB 060505: Swift-BAT detection of a weak burst
  78. GRB 060428B: spectroscopy
  79. GRB 060502B: optical observations
  80. GRB 060502B: AROMA refined photometric calibration
  81. GRB 060502B MDM Follow-up Observation
  82. GRB 060502b: Gemini imaging and spectroscopy
  83. GRB060502A, optical observation
  84. GRB 060502B: Swift/UVOT upper limits
  85. GRB 060502A: Swift/UVOT source detection
  86. GRB 060502B: MDM Optical Observation
  87. GRB 060502B: Refined analysis of the Swift-BAT short burst
  88. GRB060502B: Swift XRT Team refined analysis
  89. GRB 060501: P60 Observations and Candidate Retraction
  90. GRB 060502B: Xinglong optical observation
  91. GRB060502: Swift-XRT refined analysis
  92. GRB 060502: Swift-BAT refined analysis
  93. GRB060501: Swift UVOT followup observations
  94. GRB 060502: P60 Afterglow Confirmation
  95. GRB 060502: Swift detection of a burst with an optical counterpart
  96. GRB060501: P60 imaging and afterglow candidate
  97. GRB 060501: Refined analysis of the Swift-BAT burst
  98. GRB060428B - SDSS Pre-Burst Observations
  99. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  100. GRB 060428B: MDM Observations

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