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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"

26042 results found.

  1. GRB 060604: Swift detection of a burst with possible optical counterpart
  2. GRB 060602A: Swift-BAT Refined Analysis: Correction
  3. GRB 060602B: XMM-Newton Survey Source
  4. GRB 060602B: Swift-XRT Refined Analysis
  5. GRB 060602B: Swift-BAT Refined Analysis
  6. GRB 060602B: Swift/UVOT observations
  7. GRB 060602A: Swift-BAT Refined Analysis
  8. GRB 060602B: RTT150 optical observations
  9. GRB 060211A : WIDGET simultaneous optical observations
  10. GRB 060526: Tautenburg Second Epoch Observations
  11. GRB 060602B: Swift detection of a burst
  12. GRB060602B: BOOTES-IR candidate afterglow
  13. GRB060602 - SDSS Pre-Burst Observations
  14. GRB 060602: Swift detection of a burst
  15. GRB 060502A: Optical afterglow observations
  16. GRB 060526: Break in X-ray light curve
  17. GRB 060526: RTT150 optical observations
  18. GRB 051227 : WIDGET simultaneous optical observations
  19. GRB 051028 : WIDGET pre-trigger limit
  20. GRB 060526: RTT150 optical observations
  21. GRB 060526: Multiple Optical Flares
  22. GRB060526: afterglow fitting and probable jet break
  23. GRB 060526: RTT150 optical observations
  24. GRB060526: Optical counterpart from MIRO
  25. GRB060502b: optical observations
  26. GRB 060526: RTT150 optical observations
  27. GRB 060526: Tautenburg OT observation and light curve fitting
  28. GRB 060526: SMARTS optical/IR afterglow observations
  29. GRB 060526: REM observations
  30. GRB 060526: RTT150 optical observations, afterglow flattening
  31. GRB 060526: Optical Flare
  32. GRB 060526: MDM-2.4m Observations
  33. GRB 060526: Refined analysis of the Swift-BAT burst
  34. GRB 060526: RTT150 optical observations
  35. GRB060526: Further Swift-UVOT Observations
  36. GRB 060526: Magellan Redshift
  37. GRB 060526 Lulin optical observation
  38. GRB 060526: Swift/XRT Team refined analysis
  39. GRB 060526: TNG optical observations
  40. GRB 060526: ROTSE-III Observations of Optical Counterpart
  41. GRB 060526: Watcher Observations
  42. GRB 060526: Continued emission for the Swift burst
  43. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  44. GRB060505: VLT observations of the optical afterglow
  45. GRB 060413 : WIDGET simultaneous optical observations
  46. GRB 060522: Swift/UVOT Observations: Correction
  47. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  48. XMM-Newton observation of GRB060510b
  49. GRB060512: Late-Time P200 Observations
  50. GRB060522: z = 5.11 Keck-LRIS Redshift
  51. GRB 060522: Swift/XRT Team refined analysis
  52. GRB 060522: Swift-BAT Refined Analysis
  53. GRB 060522: REM NIR observations
  54. GRB 060522: TNG optical observations
  55. GRB 060522: Swift detection of a burst with possible optical afterglow
  56. GRB 060515: NIR observation
  57. GRB 060210: Jet Break in the XRT light curve
  58. GRB 060516: Refined analysis of the Swift-BAT burst
  59. GRB 060516: Swift detection of a burst
  60. GRB060515: P200 NIR Observations
  61. GRB 060505 BAT refined analysis
  62. GRB 060515 BAT refined analysis
  63. GRB 060512: TAROT optical observation
  64. GRB 060515: Swift/XRT Team refined analysis
  65. GRB 060515: Swift/UVOT Upper Limits
  66. GRB 060515: Swift/XRT position
  67. GRB 060515: Super-LOTIS Observations
  68. GRB060515: Swift/UVOT initial observation
  69. GRB 060515: TAROT optical observation
  70. GRB 060515: ROTSE-III Optical Limits
  71. GRB 060515: Swift detection of a burst
  72. VLT optical spectroscopy of GRB 060512
  73. Swift/UVOT observations of GRB060512.
  74. GRB060512: Swift XRT Team refined analysis
  75. GRB 060512: Detection of NIR afterglow
  76. GRB 060512: P60 Observations
  77. GRB 060512: Swift-BAT Refined Analysis
  78. GRB 060505 - OT candidate + galaxy spectrum
  79. GRB 060512: optical decay
  80. GRB 060512: REM NIR observations
  81. GRB060512 Name Correction: LT Afterglow detection
  82. GRB060512: Liverpool Telescope Afterglow detection
  83. GRB 060512: Swift detection of a burst with an optical afterglow
  84. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  85. GRB 060505: X-ray afterglow - Correction -
  86. GRB 060505: X-ray afterglow
  87. Konus-Wind observation of GRB 060510A
  88. GRB060418: optical observations
  89. GRB 060428a, SMARTS optical/IR afterglow detection
  90. GRB060510B: Swift XRT refined analysis
  91. GRB 060510B: Swift/UVOT Upper Limits
  92. GRB 060510A: Refined analysis of the Swift-BAT burst
  93. GRB 060510B: Swift-BAT Refined Analysis
  94. GRB060510A: XRT refined analysis
  95. GRB 060510b: Redshift
  96. GRB060510B : Faulkes North Telescope detection
  97. GRB 060510b: Gemini NIR observations
  98. GRB 060510B: Super-LOTIS Observations
  99. GRB 060510b: NIR observations
  100. GRB 060510B: MDM Observations and candidate OT

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