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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"
  1. GRB 060526: RTT150 optical observations, afterglow flattening
  2. GRB 060526: Optical Flare
  3. GRB 060526: MDM-2.4m Observations
  4. GRB 060526: Refined analysis of the Swift-BAT burst
  5. GRB 060526: RTT150 optical observations
  6. GRB060526: Further Swift-UVOT Observations
  7. GRB060526, optical observations
  8. GRB 060526: Magellan Redshift
  9. GRB 060526 Lulin optical observation
  10. GRB 060526: Swift/XRT Team refined analysis
  11. GRB 060526: TNG optical observations
  12. GRB 060526: ROTSE-III Observations of Optical Counterpart
  13. GRB 060526: Watcher Observations
  14. GRB060526 - SDSS Pre-burst Observations
  15. GRB 060526: Continued emission for the Swift burst
  16. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  17. GRB060505: VLT observations of the optical afterglow
  18. GRB 060413 : WIDGET simultaneous optical observations
  19. GRB 060522: Swift/UVOT Observations: Correction
  20. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  21. XMM-Newton observation of GRB060510b
  22. GRB060512: Late-Time P200 Observations
  23. GRB060522: z = 5.11 Keck-LRIS Redshift
  24. GRB 060522: Swift/XRT Team refined analysis
  25. GRB 060522: Swift-BAT Refined Analysis
  26. GRB 060522: REM NIR observations
  27. GRB 060522: TNG optical observations
  28. GRB 060522: Swift detection of a burst with possible optical afterglow
  29. GRB 060512: reanalysis of optical spectra
  30. GRB 060515: NIR observation
  31. GRB 060210: Jet Break in the XRT light curve
  32. GRB 060516: Refined analysis of the Swift-BAT burst
  33. GRB 060512: TNG optical spectroscopy
  34. GRB 060516: Swift detection of a burst
  35. GRB060515: P200 NIR Observations
  36. GRB 060505 BAT refined analysis
  37. GRB 060515 BAT refined analysis
  38. GRB 060512: TAROT optical observation
  39. GRB 060515: Swift/XRT Team refined analysis
  40. GRB 060515: Swift/UVOT Upper Limits
  41. GRB 060515: Swift/XRT position
  42. GRB 060515: Super-LOTIS Observations
  43. GRB060515: Swift/UVOT initial observation
  44. GRB 060515: TAROT optical observation
  45. GRB 060515: ROTSE-III Optical Limits
  46. GRB 060515: Swift detection of a burst
  47. VLT optical spectroscopy of GRB 060512
  48. Swift/UVOT observations of GRB060512.
  49. GRB 060512: Subaru NIR observation
  50. GRB060512: Swift XRT Team refined analysis
  51. GRB 060512: 1.54m Kuiper Observations
  52. GRB 060512: Detection of NIR afterglow
  53. GRB 060512: P60 Observations
  54. GRB 060512: Swift-BAT Refined Analysis
  55. GRB 060505 - OT candidate + galaxy spectrum
  56. GRB 060512: optical decay
  57. GRB 060512: REM NIR observations
  58. GRB060512 - SDSS Pre-Burst Observations
  59. GRB060512 Name Correction: LT Afterglow detection
  60. GRB060512: Liverpool Telescope Afterglow detection
  61. GRB 060512: Swift detection of a burst with an optical afterglow
  62. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  63. GRB 060505: X-ray afterglow - Correction -
  64. GRB 060505: X-ray afterglow
  65. Konus-Wind observation of GRB 060510A
  66. GRB060418: optical observations
  67. GRB 060428a, SMARTS optical/IR afterglow detection
  68. GRB060510B: Swift XRT refined analysis
  69. GRB 060510B: Swift/UVOT Upper Limits
  70. GRB 060510A: Refined analysis of the Swift-BAT burst
  71. GRB 060510B: Swift-BAT Refined Analysis
  72. GRB060510A: XRT refined analysis
  73. GRB060510 - SDSS Pre-Burst Observations
  74. GRB 060510b: Redshift
  75. GRB060510B : Faulkes North Telescope detection
  76. GRB 060510B : Planned XMM-Newton observation
  77. GRB 060510b: Gemini NIR observations
  78. GRB 060510B: Super-LOTIS Observations
  79. GRB 060510b: NIR observations
  80. GRB 060510B: Coordinate correction
  81. GRB 060510B: MDM Observations and candidate OT
  82. GRB 060510B: Swift detection of a burst
  83. GRB 060510: Swift detection of a burst with optical transient
  84. GRB060507: optical afterglow detection
  85. GRB060502B: improvement in the XRT afterglow position
  86. GRB 060507: BART limit
  87. GRB 060507: Final Refined analysis of the Swift-BAT burst
  88. GRB 060507: Swift-BAT Refined Analysis
  89. GRB 060505: PROMPT Observations
  90. GRB 060507: Swift/UVOT Upper Limits
  91. GRB 060507: Swift XRT Team Refined Analysis
  92. GRB 060507: MDM Optical Upper Limit
  93. GRB060507: Swift XRT position
  94. GRB 060507: Swift detection of a burst
  95. GRB 060429: Suzaku WAM observation
  96. GRB060505: Swift/UVOT Observations
  97. GRB 060505: Swift XRT Team Refined Analysis
  98. GRB060425: new MASTER survey method
  99. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  100. GRB 060505: Swift XRT afterglow canditate position

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