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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

19662 results found.

  1. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  2. GRB 101008A: Swift detection of a burst
  3. Refined analysis shows Swift Trigger 435520 is not a GRB
  4. Swift Trigger 435520 is probably not a GRB
  5. GRB 100924A: Suzaku WAM observation of the prompt emission
  6. GRB 100928A, Swift-BAT refined analysis
  7. GRB 100924A: Fermi GBM observation
  8. GRB 100928A: Swift detection of a burst
  9. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  10. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  11. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  12. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  13. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  14. GRB100925A UVOT afterglow
  15. GRB 100924A: GROND detection of an optical/NIR afterglow
  16. GRB 100925A: Swift detection of a burst
  17. GRB 100924A: Swift-BAT refined analysis
  18. GRB 100924A: Swift detection of a burst
  19. GRB 100917A: TAROT La Silla observatory optical observations
  20. GRB 100915A: TAROT Calern observatory optical observations
  21. GRB100906A: Ashra-1 observation of early optical emission
  22. GRB 100917A: Swift-BAT refined analysis
  23. GRB 100917A: Swift detection of a burst
  24. GRB 100915A: GRT Optical Observation
  25. GRB 100915A: Correction to Swift-BAT refined analysis
  26. GRB 100915A: Swift/UVOT Upper Limits
  27. GRB 100915A: Swift-BAT refined analysis
  28. GRB 100915A: Swift-XRT refined analysis
  29. GRB 100915A: Enhanced Swift-XRT position
  30. GRB 100915A: Swift detection of a likely burst
  31. Swift-BAT trigger 433953 is not a burst
  32. Swift BAT Trigger 433953 probably not a GRB
  33. GRB 100909A: Swift/UVOT observations
  34. GRB 100901A: optical observations in Mondy and R-light curve
  35. GRB 100909A: Swift-XRT refined analysis
  36. GRB 100906A: optical observations at Mt.Terskol
  37. GRB 100901A: optical observation in Maidanak, break confirmation
  38. GRB 100909A: Faulkes Telescope North afterglow candidate
  39. GRB 100909A: ROTSE-III Optical Limits
  40. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  41. GRB 100909A: Swift target of opportunity observation
  42. EVLA detection of radio afterglow of GRB100901A
  43. GRB 100901A: CrAO optical observations
  44. GRB100906A: R band observations
  45. Konus-Wind observation of GRB 100906A
  46. GRB 100906A: Fermi GBM observation
  47. GRB 100901A: TLS Detection at 5.5 days
  48. GRB 100906A: Swift-XRT refined analysis
  49. GRB 100906A: Enhanced Swift-XRT position
  50. GRB 100906A: Swift/UVOT Observations
  51. GRB 100906A: TLS Multicolor Observations
  52. GRB 100905A: Swift/UVOT Upper Limits
  53. GRB 100901A: ISON-NM optical observations
  54. GRB 100906A: Swift-BAT refined analysis
  55. GRB 100906A: MASTER preliminary polarization prompt light curve
  56. GRB 100906A : Faulkes Telescope North optical observations
  57. GRB 100906A: MASTER early OT observations
  58. GRB 100906A: Swift detection of a burst with an optical afterglow
  59. GRB 100905A: Swift-XRT refined analysis.
  60. GRB 100905A: Enhanced Swift-XRT position
  61. GRB 100905A: Swift-BAT refined analysis
  62. GRB100904A: BOOTES-3 Upper Limit
  63. GRB 100905A: MASTER Prompt Optical Observations
  64. GRB 100905A: Faulkes Telescope North observations
  65. GRB 100905A: Swift detection of a burst
  66. GRB 100904A: Swift-BAT refined analysis
  67. GRB 100904A: Swift detection of a burst
  68. GRB 100902A: Swift-BAT refined analysis
  69. GRB 100901A: optical observation at Mt.Terskol
  70. GRB 100901A: multicolor photometry at Mt.Terskol
  71. IPN Triangulation of the very bright GRB 100829A
  72. GRB 100901A: Lightbuckets Optical Observations
  73. GRB 100902A: 1.5m OSN I-band Upper Limits
  74. Tentative redshift of GRB100902A from Swift-XRT data
  75. GRB 100902A: Swift XRT refined analysis
  76. GRB 100902A: Swift/UVOT Upper Limits
  77. GRB 100902A: optical observation at Mt.Terskol
  78. GRB 100901A: optical observation at Mt.Terskol
  79. GRB 100902A: Enhanced Swift-XRT position
  80. GRB 100901A: TLS Observations: Break?
  81. GRB 100902A: MASTER Prompt Optical Observations
  82. GRB 100901A: ISON-NM optical observations
  83. GRB 100902A: MASTER Optical Early Limit
  84. GRB 100902A: Swift detection of a burst
  85. GRB 100901A: 1.5m OSN BVRI-band observations.
  86. GRB 100901A: ROTSE-III Detection
  87. Swift/UVOT Observations of GRB100901A
  88. GRB 100901A: Swift-XRT Team refined analysis
  89. GRB 100901A: Swift-BAT refined analysis
  90. GRB 100901A: optical observation at Mt.Terskol
  91. GRB 100901A: Enhanced Swift-XRT position
  92. GRB 100901A: optical observation at Mt.Terskol
  93. GRB 100901A: MASTER power low decay
  94. GRB 100901A: MASTER: the OT brightenning
  95. GRB 100901A: confirmation of the afterglow
  96. GRB 100901A: MASTER Optical Early Limits
  97. GRB 100901A: Faulkes Telescope North afterglow candidate
  98. GRB 100901A: Swift detection of a burst with an optical afterglow
  99. GRB 100823A: optical upper limit
  100. GRB 100814A: Maidanak optical observations

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