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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"

19189 results found.

  1. GRB 060602B: XMM-Newton Survey Source
  2. GRB 060602B: Swift-XRT Refined Analysis
  3. GRB 060602B: Swift-BAT Refined Analysis
  4. GRB 060602B: Swift/UVOT observations
  5. GRB 060602A: Swift-BAT Refined Analysis
  6. GRB 060602B: RTT150 optical observations
  7. GRB 060602B: Swift detection of a burst
  8. GRB060602 - SDSS Pre-Burst Observations
  9. GRB 060602: Swift detection of a burst
  10. GRB 060526: Break in X-ray light curve
  11. GRB 051227 : WIDGET simultaneous optical observations
  12. GRB 060526: Multiple Optical Flares
  13. GRB060502b: optical observations
  14. GRB 060526: Optical Flare
  15. GRB 060526: Refined analysis of the Swift-BAT burst
  16. GRB 060526: RTT150 optical observations
  17. GRB060526: Further Swift-UVOT Observations
  18. GRB 060526: Swift/XRT Team refined analysis
  19. GRB 060526: ROTSE-III Observations of Optical Counterpart
  20. GRB 060526: Watcher Observations
  21. GRB 060526: Continued emission for the Swift burst
  22. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  23. GRB 060413 : WIDGET simultaneous optical observations
  24. GRB 060522: Swift/UVOT Observations: Correction
  25. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  26. XMM-Newton observation of GRB060510b
  27. GRB 060522: Swift/XRT Team refined analysis
  28. GRB 060522: Swift-BAT Refined Analysis
  29. GRB 060522: Swift detection of a burst with possible optical afterglow
  30. GRB 060210: Jet Break in the XRT light curve
  31. GRB 060516: Refined analysis of the Swift-BAT burst
  32. GRB 060516: Swift detection of a burst
  33. GRB 060505 BAT refined analysis
  34. GRB 060515 BAT refined analysis
  35. GRB 060512: TAROT optical observation
  36. GRB 060515: Swift/XRT Team refined analysis
  37. GRB 060515: Swift/UVOT Upper Limits
  38. GRB 060515: Swift/XRT position
  39. GRB 060515: Super-LOTIS Observations
  40. GRB060515: Swift/UVOT initial observation
  41. GRB 060515: TAROT optical observation
  42. GRB 060515: ROTSE-III Optical Limits
  43. GRB 060515: Swift detection of a burst
  44. Swift/UVOT observations of GRB060512.
  45. GRB060512: Swift XRT Team refined analysis
  46. GRB 060512: Detection of NIR afterglow
  47. GRB 060512: Swift-BAT Refined Analysis
  48. GRB060512 Name Correction: LT Afterglow detection
  49. GRB060512: Liverpool Telescope Afterglow detection
  50. GRB 060512: Swift detection of a burst with an optical afterglow
  51. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  52. GRB 060505: X-ray afterglow - Correction -
  53. GRB 060505: X-ray afterglow
  54. Konus-Wind observation of GRB 060510A
  55. GRB 060428a, SMARTS optical/IR afterglow detection
  56. GRB060510B: Swift XRT refined analysis
  57. GRB 060510B: Swift/UVOT Upper Limits
  58. GRB 060510A: Refined analysis of the Swift-BAT burst
  59. GRB 060510B: Swift-BAT Refined Analysis
  60. GRB060510A: XRT refined analysis
  61. GRB 060510B: Super-LOTIS Observations
  62. GRB 060510B: MDM Observations and candidate OT
  63. GRB 060510B: Swift detection of a burst
  64. GRB 060510: Swift detection of a burst with optical transient
  65. GRB060502B: improvement in the XRT afterglow position
  66. GRB 060507: BART limit
  67. GRB 060507: Final Refined analysis of the Swift-BAT burst
  68. GRB 060507: Swift-BAT Refined Analysis
  69. GRB 060507: Swift/UVOT Upper Limits
  70. GRB 060507: Swift XRT Team Refined Analysis
  71. GRB 060507: MDM Optical Upper Limit
  72. GRB060507: Swift XRT position
  73. GRB 060507: Swift detection of a burst
  74. GRB060505: Swift/UVOT Observations
  75. GRB 060505: Swift XRT Team Refined Analysis
  76. GRB 060505: Swift XRT afterglow canditate position
  77. GRB 060505: Swift-BAT detection of a weak burst
  78. GRB 060502B MDM Follow-up Observation
  79. GRB060502A, optical observation
  80. GRB 060502B: Swift/UVOT upper limits
  81. GRB 060502A: Swift/UVOT source detection
  82. GRB 060502B: MDM Optical Observation
  83. GRB 060502B: Refined analysis of the Swift-BAT short burst
  84. GRB060502B: Swift XRT Team refined analysis
  85. GRB060502B: correction to XRT position
  86. GRB 060502B: MASTER optical observations
  87. GRB 060502B: Swift detection of a short burst
  88. GRB060502: Swift-XRT refined analysis
  89. GRB 060502: Swift-BAT refined analysis
  90. GRB 060502: APO Spectroscopic Observations
  91. GRB060501: Swift UVOT followup observations
  92. GRB060502: Super-LOTIS Observations
  93. GRB 060502: Swift detection of a burst with an optical counterpart
  94. GRB 060501: MDM Observations
  95. GRB060501: Super-LOTIS observations
  96. GRB060501: P60 imaging and afterglow candidate
  97. GRB 060501: Refined analysis of the Swift-BAT burst
  98. GRB060501: Swift XRT position
  99. GRB 060501: ROTSE-III Optical Limits
  100. GRB 060501: Swift detection of a burst

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