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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"

19533 results found.

  1. GRB 100909A: Swift/UVOT observations
  2. GRB 100901A: optical observations in Mondy and R-light curve
  3. GRB 100909A: Swift-XRT refined analysis
  4. GRB 100906A: optical observations at Mt.Terskol
  5. GRB 100901A: optical observation in Maidanak, break confirmation
  6. GRB 100909A: Faulkes Telescope North afterglow candidate
  7. GRB 100909A: ROTSE-III Optical Limits
  8. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  9. GRB 100909A: Swift target of opportunity observation
  10. EVLA detection of radio afterglow of GRB100901A
  11. GRB 100901A: CrAO optical observations
  12. GRB100906A: R band observations
  13. Konus-Wind observation of GRB 100906A
  14. GRB 100906A: Fermi GBM observation
  15. GRB 100901A: TLS Detection at 5.5 days
  16. GRB 100906A: Swift-XRT refined analysis
  17. GRB 100906A: Enhanced Swift-XRT position
  18. GRB 100906A: Swift/UVOT Observations
  19. GRB 100906A: TLS Multicolor Observations
  20. GRB 100905A: Swift/UVOT Upper Limits
  21. GRB 100901A: ISON-NM optical observations
  22. GRB 100906A: Swift-BAT refined analysis
  23. GRB 100906A: MASTER preliminary polarization prompt light curve
  24. GRB 100906A : Faulkes Telescope North optical observations
  25. GRB 100906A: MASTER early OT observations
  26. GRB 100906A: Swift detection of a burst with an optical afterglow
  27. GRB 100905A: Swift-XRT refined analysis.
  28. GRB 100905A: Enhanced Swift-XRT position
  29. GRB 100905A: Swift-BAT refined analysis
  30. GRB100904A: BOOTES-3 Upper Limit
  31. GRB 100905A: MASTER Prompt Optical Observations
  32. GRB 100905A: Faulkes Telescope North observations
  33. GRB 100905A: Swift detection of a burst
  34. GRB 100904A: Swift-BAT refined analysis
  35. GRB 100904A: Swift detection of a burst
  36. GRB 100902A: Swift-BAT refined analysis
  37. GRB 100901A: optical observation at Mt.Terskol
  38. GRB 100901A: multicolor photometry at Mt.Terskol
  39. IPN Triangulation of the very bright GRB 100829A
  40. GRB 100901A: Lightbuckets Optical Observations
  41. GRB 100902A: 1.5m OSN I-band Upper Limits
  42. Tentative redshift of GRB100902A from Swift-XRT data
  43. GRB 100902A: Swift XRT refined analysis
  44. GRB 100902A: Swift/UVOT Upper Limits
  45. GRB 100902A: optical observation at Mt.Terskol
  46. GRB 100901A: optical observation at Mt.Terskol
  47. GRB 100902A: Enhanced Swift-XRT position
  48. GRB 100901A: TLS Observations: Break?
  49. GRB 100902A: MASTER Prompt Optical Observations
  50. GRB 100901A: ISON-NM optical observations
  51. GRB 100902A: MASTER Optical Early Limit
  52. GRB 100902A: Swift detection of a burst
  53. GRB 100901A: 1.5m OSN BVRI-band observations.
  54. GRB 100901A: ROTSE-III Detection
  55. Swift/UVOT Observations of GRB100901A
  56. GRB 100901A: Swift-XRT Team refined analysis
  57. GRB 100901A: Swift-BAT refined analysis
  58. GRB 100901A: optical observation at Mt.Terskol
  59. GRB 100901A: Enhanced Swift-XRT position
  60. GRB 100901A: optical observation at Mt.Terskol
  61. GRB 100901A: MASTER power low decay
  62. GRB 100901A: MASTER: the OT brightenning
  63. GRB 100901A: confirmation of the afterglow
  64. GRB 100901A: MASTER Optical Early Limits
  65. GRB 100901A: Faulkes Telescope North afterglow candidate
  66. GRB 100901A: Swift detection of a burst with an optical afterglow
  67. GRB 100823A: optical upper limit
  68. GRB 100814A: Maidanak optical observations
  69. GRB 100823A: optical observations
  70. GRB 100823A: MAXI/GSC detection
  71. GRB 100725B: Mondy optical upper limit
  72. GRB 100725B: Maidanak optical upper limit
  73. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
  74. GRB100807A: R band observations
  75. GRB100823A : MOA optical observation
  76. GRB 100823A: Swift XRT refined analysis
  77. GRB 100823: 1.5m OSN I-band observations
  78. GRB 100823A: Swift/UVOT Upper Limits
  79. GRB 100823A: Swift-BAT refined analysis
  80. GRB 100823A: Enhanced Swift-XRT position
  81. GRB 100823A: Swift detection of a burst
  82. GRB 100814A: Suzaku WAM observation of the prompt emission
  83. GRB 100814A: ISON-NM optical observations
  84. EVLA radio afterglow detection of GRB 100814A
  85. GRB 100814A: optical observations
  86. Konus-Wind observation of GRB 100816A
  87. GRB 100816A: Fermi GBM observation
  88. Konus-Wind observation of GRB 100814A
  89. GRB 100816A: Gemini-N spectroscopy
  90. GRB 100816A: Swift UVOT Observations
  91. GRB100816A Swift-XRT refined analysis
  92. GRB 100816A: Swift-BAT spectral lag results
  93. GRB 100816A: 1.23m CAHA optical observations
  94. GRB 100816A, Swift-BAT refined analysis
  95. GRB 100816A: Enhanced Swift-XRT position
  96. GRB100814A - interesting UVOT lightcurve.
  97. GRB 100816A: TAROT Calern observatory optical detection
  98. GRB100816A: TNG optical afterglow confirmation.
  99. GRB 100816A: ROTSE-III Optical Limits
  100. GRB 100816A: Swift detection of a possibly short burst with optical afterglow

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