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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"

26482 results found.

  1. GRB060604: Swift/UVOT detections
  2. GRB 060604: Swift-XRT Team refined analysis
  3. GRB 060604: BAT refined analysis
  4. GRB 060604A: ROTSE-III Optical Limits
  5. GRB 060604: Swift detection of a burst with possible optical counterpart
  6. GRB 060602A: Swift-BAT Refined Analysis: Correction
  7. GRB 060602B: Swift-XRT Refined Analysis
  8. GRB 060602B: Swift-BAT Refined Analysis
  9. GRB 060602B: Swift/UVOT observations
  10. GRB 060602A: Swift-BAT Refined Analysis
  11. GRB 060211A : WIDGET simultaneous optical observations
  12. GRB060602A: optical observations(/transient?)
  13. GRB 060602B: Swift detection of a burst
  14. GRB060602B: BOOTES-IR candidate afterglow
  15. GRB060602 - SDSS Pre-Burst Observations
  16. GRB 060502A: Optical afterglow observations
  17. GRB 060526: Break in X-ray light curve
  18. GRB060526, optical observations
  19. GRB 051227 : WIDGET simultaneous optical observations
  20. GRB 051028 : WIDGET pre-trigger limit
  21. GRB060526: Optical counterpart from MIRO
  22. GRB 060526: RTT150 optical observations
  23. GRB060526: optical observations
  24. GRB 060526: REM observations
  25. GRB 060526: RTT150 optical observations, afterglow flattening
  26. GRB 060526: MDM-2.4m Observations
  27. GRB 060526: Refined analysis of the Swift-BAT burst
  28. GRB 060526: RTT150 optical observations
  29. GRB060526, optical observations
  30. GRB 060526: Swift/XRT Team refined analysis
  31. GRB 060526: ROTSE-III Observations of Optical Counterpart
  32. GRB 060526: Watcher Observations
  33. GRB060526 - SDSS Pre-burst Observations
  34. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  35. GRB 060413 : WIDGET simultaneous optical observations
  36. XMM-Newton observation of GRB060510b
  37. GRB060512: Late-Time P200 Observations
  38. GRB 060522: Swift-BAT Refined Analysis
  39. GRB 060522: REM NIR observations
  40. GRB 060522: TNG optical observations
  41. GRB 060515: NIR observation
  42. GRB 060210: Jet Break in the XRT light curve
  43. GRB 060516: Refined analysis of the Swift-BAT burst
  44. GRB060515: P200 NIR Observations
  45. GRB 060505 BAT refined analysis
  46. GRB 060515 BAT refined analysis
  47. GRB 060512: TAROT optical observation
  48. GRB 060515: Swift/XRT Team refined analysis
  49. GRB 060515: Swift/UVOT Upper Limits
  50. GRB 060515: Swift/XRT position
  51. GRB 060515: Super-LOTIS Observations
  52. GRB 060515: TAROT optical observation
  53. GRB 060512: Subaru NIR observation
  54. GRB060512: Swift XRT Team refined analysis
  55. GRB 060512: 1.54m Kuiper Observations
  56. GRB 060512: Detection of NIR afterglow
  57. GRB 060512: P60 Observations
  58. GRB 060512: Swift-BAT Refined Analysis
  59. GRB 060512: REM NIR observations
  60. GRB060512 - SDSS Pre-Burst Observations
  61. GRB 060512: Swift detection of a burst with an optical afterglow
  62. GRB 060505: X-ray afterglow - Correction -
  63. GRB 060505: X-ray afterglow
  64. Konus-Wind observation of GRB 060510A
  65. GRB060418: optical observations
  66. GRB 060428a, SMARTS optical/IR afterglow detection
  67. GRB060510B: Swift XRT refined analysis
  68. GRB 060510A: Refined analysis of the Swift-BAT burst
  69. GRB 060510B: Swift-BAT Refined Analysis
  70. GRB060510A: XRT refined analysis
  71. GRB060510 - SDSS Pre-Burst Observations
  72. GRB 060510B: Swift detection of a burst
  73. GRB 060510: Swift detection of a burst with optical transient
  74. GRB060507: optical afterglow detection
  75. GRB060502B: improvement in the XRT afterglow position
  76. GRB 060507: Final Refined analysis of the Swift-BAT burst
  77. GRB 060507: Swift-BAT Refined Analysis
  78. GRB 060505: PROMPT Observations
  79. GRB 060507: Swift XRT Team Refined Analysis
  80. GRB 060507: Swift detection of a burst
  81. GRB 060429: Suzaku WAM observation
  82. GRB060505: Swift/UVOT Observations
  83. GRB060425: new MASTER survey method
  84. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  85. GRB 060505: Swift XRT afterglow canditate position
  86. GRB 060502b: Second epoch Gemini observations
  87. GRB 060505: Swift-BAT detection of a weak burst
  88. GRB 060428B: spectroscopy
  89. GRB 060502B: optical observations
  90. GRB 060502B: AROMA refined photometric calibration
  91. GRB 060502B MDM Follow-up Observation
  92. GRB 060502b: Gemini imaging and spectroscopy
  93. GRB060502A, optical observation
  94. GRB 060502B: Swift/UVOT upper limits
  95. GRB 060502A: Swift/UVOT source detection
  96. GRB 060502B: MDM Optical Observation
  97. GRB 060502B: Refined analysis of the Swift-BAT short burst
  98. GRB060502B: Swift XRT Team refined analysis
  99. GRB 060501: P60 Observations and Candidate Retraction
  100. GRB 060502B: Xinglong optical observation

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