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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"

28072 results found.

  1. GRB 060607: REM NIR afterglow
  2. GRB 060607: Swift detection of a burst with bright optical counterpart
  3. GRB 060522: PROMPT Optical Limits
  4. GRB060602B : REM infrared observations
  5. GRB060605: Swift/UVOT detections
  6. GRB 060605: Swift-XRT Team refined analysis
  7. SALT spectroscopy of GRB 060605
  8. GRB 060605: TNG optical observations
  9. GRB 060605: RTT150 optical observations
  10. GRB 060605: ROTSE-III Optical Counterpart
  11. GRB 060605: Swift detection of a burst with optical counterpart
  12. GRB 060605: ROTSE-III Detection of Optical Counterpart
  13. GRB060604: Swift/UVOT detections
  14. GRB 060604: redshift
  15. GRB 060512: Keck Redshift
  16. GRB 060604 optical photometry
  17. GRB 060604: Swift-XRT Team refined analysis
  18. GRB 060604A: ROTSE-III Optical Limits
  19. GRB 060604: Swift detection of a burst with possible optical counterpart
  20. GRB 060602B: XMM-Newton Survey Source
  21. GRB 060602B: Swift-XRT Refined Analysis
  22. GRB 060602B: Swift-BAT Refined Analysis
  23. GRB 060602B: Swift/UVOT observations
  24. GRB 060602B: RTT150 optical observations
  25. GRB 060211A : WIDGET simultaneous optical observations
  26. GRB 060526: Tautenburg Second Epoch Observations
  27. GRB 060602B: Swift detection of a burst
  28. GRB060602B: BOOTES-IR candidate afterglow
  29. GRB 060602: Swift detection of a burst
  30. GRB 060502A: Optical afterglow observations
  31. GRB 060526: Break in X-ray light curve
  32. GRB 060526: RTT150 optical observations
  33. GRB 051227 : WIDGET simultaneous optical observations
  34. GRB 051028 : WIDGET pre-trigger limit
  35. GRB 060526: RTT150 optical observations
  36. GRB 060526: Multiple Optical Flares
  37. GRB060526: afterglow fitting and probable jet break
  38. GRB 060526: RTT150 optical observations
  39. GRB060526: Optical counterpart from MIRO
  40. GRB 060526: RTT150 optical observations
  41. GRB 060526: Tautenburg OT observation and light curve fitting
  42. GRB 060526: SMARTS optical/IR afterglow observations
  43. GRB 060526: REM observations
  44. GRB 060526: RTT150 optical observations, afterglow flattening
  45. GRB 060526: Optical Flare
  46. GRB 060526: MDM-2.4m Observations
  47. GRB 060526: Refined analysis of the Swift-BAT burst
  48. GRB060526: Further Swift-UVOT Observations
  49. GRB 060526: Magellan Redshift
  50. GRB 060526 Lulin optical observation
  51. GRB 060526: Swift/XRT Team refined analysis
  52. GRB 060526: TNG optical observations
  53. GRB 060526: ROTSE-III Observations of Optical Counterpart
  54. GRB 060526: Continued emission for the Swift burst
  55. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  56. GRB060505: VLT observations of the optical afterglow
  57. GRB 060413 : WIDGET simultaneous optical observations
  58. GRB 060522: Swift/UVOT Observations: Correction
  59. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  60. XMM-Newton observation of GRB060510b
  61. GRB060512: Late-Time P200 Observations
  62. GRB060522: z = 5.11 Keck-LRIS Redshift
  63. GRB 060522: Swift/XRT Team refined analysis
  64. GRB 060522: REM NIR observations
  65. GRB 060522: TNG optical observations
  66. GRB 060522: Swift detection of a burst with possible optical afterglow
  67. GRB 060515: NIR observation
  68. GRB 060210: Jet Break in the XRT light curve
  69. GRB 060516: Refined analysis of the Swift-BAT burst
  70. GRB 060516: Swift detection of a burst
  71. GRB060515: P200 NIR Observations
  72. GRB 060505 BAT refined analysis
  73. GRB 060515 BAT refined analysis
  74. GRB 060515: Swift/XRT Team refined analysis
  75. GRB 060515: Swift/UVOT Upper Limits
  76. GRB 060515: Swift/XRT position
  77. GRB060515: Swift/UVOT initial observation
  78. GRB 060515: Swift detection of a burst
  79. VLT optical spectroscopy of GRB 060512
  80. Swift/UVOT observations of GRB060512.
  81. GRB 060512: Subaru NIR observation
  82. GRB060512: Swift XRT Team refined analysis
  83. GRB 060512: Detection of NIR afterglow
  84. GRB 060512: P60 Observations
  85. GRB 060505 - OT candidate + galaxy spectrum
  86. GRB 060512: optical decay
  87. GRB 060512: REM NIR observations
  88. GRB060512 Name Correction: LT Afterglow detection
  89. GRB060512: Liverpool Telescope Afterglow detection
  90. GRB 060512: Swift detection of a burst with an optical afterglow
  91. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  92. GRB 060505: X-ray afterglow - Correction -
  93. GRB 060505: X-ray afterglow
  94. GRB060418: optical observations
  95. GRB 060428a, SMARTS optical/IR afterglow detection
  96. GRB060510B: Swift XRT refined analysis
  97. GRB 060510B: Swift/UVOT Upper Limits
  98. GRB060510A: XRT refined analysis
  99. GRB 060510b: Redshift
  100. GRB060510B : Faulkes North Telescope detection

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