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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"

19663 results found.

  1. GRB 101008A: 1.23m CAHA optical observations
  2. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  3. GRB 101008A: Swift detection of a burst
  4. Refined analysis shows Swift Trigger 435520 is not a GRB
  5. Swift Trigger 435520 is probably not a GRB
  6. GRB 100924A: Suzaku WAM observation of the prompt emission
  7. GRB 100928A, Swift-BAT refined analysis
  8. GRB 100924A: Fermi GBM observation
  9. GRB 100928A: Swift detection of a burst
  10. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  11. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  12. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  13. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  14. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  15. GRB100925A UVOT afterglow
  16. GRB 100924A: GROND detection of an optical/NIR afterglow
  17. GRB 100925A: Swift detection of a burst
  18. GRB 100924A: Swift-BAT refined analysis
  19. GRB 100924A: Swift detection of a burst
  20. GRB 100917A: TAROT La Silla observatory optical observations
  21. GRB 100915A: TAROT Calern observatory optical observations
  22. GRB100906A: Ashra-1 observation of early optical emission
  23. GRB 100917A: Swift-BAT refined analysis
  24. GRB 100917A: Swift detection of a burst
  25. GRB 100915A: GRT Optical Observation
  26. GRB 100915A: Correction to Swift-BAT refined analysis
  27. GRB 100915A: Swift/UVOT Upper Limits
  28. GRB 100915A: Swift-BAT refined analysis
  29. GRB 100915A: Swift-XRT refined analysis
  30. GRB 100915A: Enhanced Swift-XRT position
  31. GRB 100915A: Swift detection of a likely burst
  32. Swift-BAT trigger 433953 is not a burst
  33. Swift BAT Trigger 433953 probably not a GRB
  34. GRB 100909A: Swift/UVOT observations
  35. GRB 100901A: optical observations in Mondy and R-light curve
  36. GRB 100909A: Swift-XRT refined analysis
  37. GRB 100906A: optical observations at Mt.Terskol
  38. GRB 100901A: optical observation in Maidanak, break confirmation
  39. GRB 100909A: Faulkes Telescope North afterglow candidate
  40. GRB 100909A: ROTSE-III Optical Limits
  41. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  42. GRB 100909A: Swift target of opportunity observation
  43. EVLA detection of radio afterglow of GRB100901A
  44. GRB 100901A: CrAO optical observations
  45. GRB100906A: R band observations
  46. Konus-Wind observation of GRB 100906A
  47. GRB 100906A: Fermi GBM observation
  48. GRB 100901A: TLS Detection at 5.5 days
  49. GRB 100906A: Swift-XRT refined analysis
  50. GRB 100906A: Enhanced Swift-XRT position
  51. GRB 100906A: Swift/UVOT Observations
  52. GRB 100906A: TLS Multicolor Observations
  53. GRB 100905A: Swift/UVOT Upper Limits
  54. GRB 100901A: ISON-NM optical observations
  55. GRB 100906A: Swift-BAT refined analysis
  56. GRB 100906A: MASTER preliminary polarization prompt light curve
  57. GRB 100906A : Faulkes Telescope North optical observations
  58. GRB 100906A: MASTER early OT observations
  59. GRB 100906A: Swift detection of a burst with an optical afterglow
  60. GRB 100905A: Swift-XRT refined analysis.
  61. GRB 100905A: Enhanced Swift-XRT position
  62. GRB 100905A: Swift-BAT refined analysis
  63. GRB100904A: BOOTES-3 Upper Limit
  64. GRB 100905A: MASTER Prompt Optical Observations
  65. GRB 100905A: Faulkes Telescope North observations
  66. GRB 100905A: Swift detection of a burst
  67. GRB 100904A: Swift-BAT refined analysis
  68. GRB 100904A: Swift detection of a burst
  69. GRB 100902A: Swift-BAT refined analysis
  70. GRB 100901A: optical observation at Mt.Terskol
  71. GRB 100901A: multicolor photometry at Mt.Terskol
  72. IPN Triangulation of the very bright GRB 100829A
  73. GRB 100901A: Lightbuckets Optical Observations
  74. GRB 100902A: 1.5m OSN I-band Upper Limits
  75. Tentative redshift of GRB100902A from Swift-XRT data
  76. GRB 100902A: Swift XRT refined analysis
  77. GRB 100902A: Swift/UVOT Upper Limits
  78. GRB 100902A: optical observation at Mt.Terskol
  79. GRB 100901A: optical observation at Mt.Terskol
  80. GRB 100902A: Enhanced Swift-XRT position
  81. GRB 100901A: TLS Observations: Break?
  82. GRB 100902A: MASTER Prompt Optical Observations
  83. GRB 100901A: ISON-NM optical observations
  84. GRB 100902A: MASTER Optical Early Limit
  85. GRB 100902A: Swift detection of a burst
  86. GRB 100901A: 1.5m OSN BVRI-band observations.
  87. GRB 100901A: ROTSE-III Detection
  88. Swift/UVOT Observations of GRB100901A
  89. GRB 100901A: Swift-XRT Team refined analysis
  90. GRB 100901A: Swift-BAT refined analysis
  91. GRB 100901A: optical observation at Mt.Terskol
  92. GRB 100901A: Enhanced Swift-XRT position
  93. GRB 100901A: optical observation at Mt.Terskol
  94. GRB 100901A: MASTER power low decay
  95. GRB 100901A: MASTER: the OT brightenning
  96. GRB 100901A: confirmation of the afterglow
  97. GRB 100901A: MASTER Optical Early Limits
  98. GRB 100901A: Faulkes Telescope North afterglow candidate
  99. GRB 100901A: Swift detection of a burst with an optical afterglow
  100. GRB 100823A: optical upper limit

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