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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"

28079 results found.

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

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