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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"

32491 results found.

  1. GRB 060602B: Swift detection of a burst
  2. GRB060602B: Watcher observations - no OT candidate
  3. GRB060602B: BOOTES-IR candidate afterglow
  4. GRB 060502A: Optical afterglow observations
  5. GRB 060526: Break in X-ray light curve
  6. GRB 060526: RTT150 optical observations
  7. GRB060526, optical observations
  8. GRB 051227 : WIDGET simultaneous optical observations
  9. GRB 051028 : WIDGET pre-trigger limit
  10. GRB 060526: RTT150 optical observations
  11. GRB 060526: Multiple Optical Flares
  12. GRB060526: afterglow fitting and probable jet break
  13. GRB 060526: RTT150 optical observations
  14. GRB060526: Optical counterpart from MIRO
  15. GRB060502b: optical observations
  16. GRB 060526: RTT150 optical observations
  17. GRB 060526: Tautenburg OT observation and light curve fitting
  18. GRB060526: optical observations
  19. GRB 060526: SMARTS optical/IR afterglow observations
  20. GRB060526: possible break in the optical light curve
  21. GRB 060526: REM observations
  22. GRB 060526: RTT150 optical observations, afterglow flattening
  23. GRB 060526: Optical Flare
  24. GRB 060526: MDM-2.4m Observations
  25. GRB 060526: Refined analysis of the Swift-BAT burst
  26. GRB 060526: RTT150 optical observations
  27. GRB060526: Further Swift-UVOT Observations
  28. GRB 060526: Magellan Redshift
  29. GRB 060526: Swift/XRT Team refined analysis
  30. GRB 060526: TNG optical observations
  31. GRB 060526: ROTSE-III Observations of Optical Counterpart
  32. GRB 060526: Watcher Observations
  33. GRB060526 - SDSS Pre-burst Observations
  34. GRB 060526: Continued emission for the Swift burst
  35. GRB060505: VLT observations of the optical afterglow
  36. GRB 060413 : WIDGET simultaneous optical observations
  37. GRB 060522: Swift/UVOT Observations: Correction
  38. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  39. XMM-Newton observation of GRB060510b
  40. GRB060512: Late-Time P200 Observations
  41. GRB060522: z = 5.11 Keck-LRIS Redshift
  42. GRB 060522: Swift/XRT Team refined analysis
  43. GRB 060522: Swift-BAT Refined Analysis
  44. GRB 060522: REM NIR observations
  45. GRB 060522: TNG optical observations
  46. GRB 060512: reanalysis of optical spectra
  47. GRB 060515: NIR observation
  48. GRB 060210: Jet Break in the XRT light curve
  49. GRB 060516: Refined analysis of the Swift-BAT burst
  50. GRB 060512: TNG optical spectroscopy
  51. GRB060515: P200 NIR Observations
  52. GRB 060505 BAT refined analysis
  53. GRB 060515 BAT refined analysis
  54. GRB 060515: Swift/XRT Team refined analysis
  55. GRB 060515: Swift/UVOT Upper Limits
  56. GRB 060515: Swift/XRT position
  57. GRB 060515: Super-LOTIS Observations
  58. GRB060515: Swift/UVOT initial observation
  59. GRB 060515: ROTSE-III Optical Limits
  60. VLT optical spectroscopy of GRB 060512
  61. Swift/UVOT observations of GRB060512.
  62. GRB 060512: Subaru NIR observation
  63. GRB060512: Swift XRT Team refined analysis
  64. GRB 060512: 1.54m Kuiper Observations
  65. GRB 060512: Detection of NIR afterglow
  66. GRB 060512: P60 Observations
  67. GRB 060512: Swift-BAT Refined Analysis
  68. GRB 060505 - OT candidate + galaxy spectrum
  69. GRB 060512: optical decay
  70. GRB 060512: REM NIR observations
  71. GRB060512 - SDSS Pre-Burst Observations
  72. GRB060512 Name Correction: LT Afterglow detection
  73. GRB060512: Liverpool Telescope Afterglow detection
  74. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  75. GRB 060505: X-ray afterglow - Correction -
  76. GRB 060505: X-ray afterglow
  77. Konus-Wind observation of GRB 060510A
  78. GRB060418: optical observations
  79. GRB 060428a, SMARTS optical/IR afterglow detection
  80. GRB060510B: Swift XRT refined analysis
  81. GRB 060510B: Swift/UVOT Upper Limits
  82. GRB 060510A: Refined analysis of the Swift-BAT burst
  83. GRB 060510B: Swift-BAT Refined Analysis
  84. GRB060510A: XRT refined analysis
  85. GRB060510 - SDSS Pre-Burst Observations
  86. GRB 060510b: Redshift
  87. GRB060510B : Faulkes North Telescope detection
  88. GRB 060510b: Gemini NIR observations
  89. GRB 060510B: Super-LOTIS Observations
  90. GRB 060510b: NIR observations
  91. GRB 060510B: Coordinate correction
  92. GRB 060510B: MDM Observations and candidate OT
  93. GRB 060510: Swift detection of a burst with optical transient
  94. GRB060507: optical afterglow detection
  95. GRB060502B: improvement in the XRT afterglow position
  96. GRB 060507: BART limit
  97. GRB 060507: Final Refined analysis of the Swift-BAT burst
  98. GRB 060507: Swift-BAT Refined Analysis
  99. GRB 060505: PROMPT Observations
  100. GRB 060507: Swift/UVOT Upper Limits

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