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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"

16155 results found.

  1. GRB060602A: Swift/UVOT upper limits
  2. GCN 060607: Swift-UVOT obswervations.
  3. GRB 060607: optical limit by "Pi of the Sky"
  4. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  5. GRB 060607: PROMPT Observations
  6. GRB 060605: RTT150 optical observations
  7. GRB 060607: Swift detection of a burst with bright optical counterpart
  8. GRB 060522: PROMPT Optical Limits
  9. GRB 060605: Xinglong TNT optical observations
  10. GRB060605: Swift/UVOT detections
  11. GRB 060605: Swift-XRT Team refined analysis
  12. GRB 060605: TNG optical observations
  13. GRB 060605: RTT150 optical observations
  14. GRB 060605: ROTSE-III Optical Counterpart
  15. GRB 060605: Swift detection of a burst with optical counterpart
  16. GRB 060605: ROTSE-III Detection of Optical Counterpart
  17. GRB 060604: redshift
  18. GRB 060512: Keck Redshift
  19. GRB 060604 optical photometry
  20. GRB 060604A: ROTSE-III Optical Limits
  21. GRB 060604: Swift detection of a burst with possible optical counterpart
  22. GRB 060602B: RTT150 optical observations
  23. GRB 060211A : WIDGET simultaneous optical observations
  24. GRB060602A: optical observations(/transient?)
  25. GRB 060526: Tautenburg Second Epoch Observations
  26. GRB 060502A: Optical afterglow observations
  27. GRB 060526: Break in X-ray light curve
  28. GRB 060526: RTT150 optical observations
  29. GRB060526, optical observations
  30. GRB 051227 : WIDGET simultaneous optical observations
  31. GRB 051028 : WIDGET pre-trigger limit
  32. GRB 060526: RTT150 optical observations
  33. GRB 060526: Multiple Optical Flares
  34. GRB060526: afterglow fitting and probable jet break
  35. GRB 060526: RTT150 optical observations
  36. GRB060526: Optical counterpart from MIRO
  37. GRB060502b: optical observations
  38. GRB 060526: RTT150 optical observations
  39. GRB060526: optical observations
  40. GRB 060526: SMARTS optical/IR afterglow observations
  41. GRB060526: possible break in the optical light curve
  42. GRB 060526: REM observations
  43. GRB 060526: RTT150 optical observations, afterglow flattening
  44. GRB 060526: Optical Flare
  45. GRB 060526: RTT150 optical observations
  46. GRB060526: Further Swift-UVOT Observations
  47. GRB060526, optical observations
  48. GRB 060526: Magellan Redshift
  49. GRB 060526 Lulin optical observation
  50. GRB 060526: TNG optical observations
  51. GRB 060526: ROTSE-III Observations of Optical Counterpart
  52. GRB 060526: Continued emission for the Swift burst
  53. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  54. GRB060505: VLT observations of the optical afterglow
  55. GRB 060413 : WIDGET simultaneous optical observations
  56. GRB 060522: Swift/UVOT Observations: Correction
  57. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  58. XMM-Newton observation of GRB060510b
  59. GRB060512: Late-Time P200 Observations
  60. GRB 060522: Swift/XRT Team refined analysis
  61. GRB 060522: REM NIR observations
  62. GRB 060522: TNG optical observations
  63. GRB 060522: Swift detection of a burst with possible optical afterglow
  64. GRB 060512: reanalysis of optical spectra
  65. GRB 060210: Jet Break in the XRT light curve
  66. GRB 060512: TNG optical spectroscopy
  67. GRB 060512: TAROT optical observation
  68. GRB 060515: Swift/XRT Team refined analysis
  69. GRB 060515: Super-LOTIS Observations
  70. GRB 060515: TAROT optical observation
  71. GRB 060515: ROTSE-III Optical Limits
  72. VLT optical spectroscopy of GRB 060512
  73. Swift/UVOT observations of GRB060512.
  74. GRB060512: Swift XRT Team refined analysis
  75. GRB 060512: 1.54m Kuiper Observations
  76. GRB 060512: optical decay
  77. GRB 060512: REM NIR observations
  78. GRB 060512: Swift detection of a burst with an optical afterglow
  79. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  80. GRB060418: optical observations
  81. GRB 060428a, SMARTS optical/IR afterglow detection
  82. GRB 060510B: Swift/UVOT Upper Limits
  83. GRB 060510b: Redshift
  84. GRB060510B : Faulkes North Telescope detection
  85. GRB 060510b: Gemini NIR observations
  86. GRB 060510b: NIR observations
  87. GRB 060510B: MDM Observations and candidate OT
  88. GRB 060510: Swift detection of a burst with optical transient
  89. GRB060507: optical afterglow detection
  90. GRB060502B: improvement in the XRT afterglow position
  91. GRB 060507: Swift/UVOT Upper Limits
  92. GRB 060507: MDM Optical Upper Limit
  93. GRB060425: new MASTER survey method
  94. GRB 060502b: Second epoch Gemini observations
  95. GRB 060428B: spectroscopy
  96. GRB 060502B: optical observations
  97. GRB 060502B MDM Follow-up Observation
  98. GRB060502A, optical observation
  99. GRB 060502B: MDM Optical Observation
  100. GRB 060502B: AROMA optical observations

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