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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"

19666 results found.

  1. GRB 100901A: Faulkes Telescope North afterglow candidate
  2. GRB 100901A: Swift detection of a burst with an optical afterglow
  3. GRB 100823A: optical upper limit
  4. GRB 100814A: Maidanak optical observations
  5. GRB 100823A: optical observations
  6. GRB 100823A: MAXI/GSC detection
  7. GRB 100725B: Mondy optical upper limit
  8. GRB 100725B: Maidanak optical upper limit
  9. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
  10. GRB100807A: R band observations
  11. GRB100823A : MOA optical observation
  12. GRB 100823A: Swift XRT refined analysis
  13. GRB 100823: 1.5m OSN I-band observations
  14. GRB 100823A: Swift/UVOT Upper Limits
  15. GRB 100823A: Swift-BAT refined analysis
  16. GRB 100823A: Enhanced Swift-XRT position
  17. GRB 100823A: Swift detection of a burst
  18. GRB 100814A: Suzaku WAM observation of the prompt emission
  19. GRB 100814A: ISON-NM optical observations
  20. EVLA radio afterglow detection of GRB 100814A
  21. GRB 100814A: optical observations
  22. Konus-Wind observation of GRB 100816A
  23. GRB 100816A: Fermi GBM observation
  24. Konus-Wind observation of GRB 100814A
  25. GRB 100816A: Gemini-N spectroscopy
  26. GRB 100816A: Swift UVOT Observations
  27. GRB100816A Swift-XRT refined analysis
  28. GRB 100816A: Swift-BAT spectral lag results
  29. GRB 100816A: 1.23m CAHA optical observations
  30. GRB 100816A, Swift-BAT refined analysis
  31. GRB 100816A: Enhanced Swift-XRT position
  32. GRB100814A - interesting UVOT lightcurve.
  33. GRB 100816A: TAROT Calern observatory optical detection
  34. GRB100816A: TNG optical afterglow confirmation.
  35. GRB 100816A: ROTSE-III Optical Limits
  36. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  37. Swift-BAT trigger 431756 is not a burst
  38. Swift/UVOT observations of GRB100814A - title correction to GCN 11097
  39. GRB 100814A: Fermi GBM observation
  40. Swift/UVOT Observations of GRB100814A - a clearer table.
  41. GRB 100814A: Swift-XRT refined analysis
  42. Swift/UVOT observations of GRB100814A
  43. GRB 100814A, Swift-BAT refined analysis
  44. GRB 100814A: Enhanced Swift-XRT position
  45. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  46. GRB 100814A: IAC80 R-band observations
  47. GRB 100814A: Swift UVOT observations of the optical afterglow
  48. GRB 100814A: Swift detection of a burst with an optical afterglow
  49. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  50. Swift-BAT trigger 431582 likely is IGR J17464-2811
  51. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  52. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  53. GRB 100807A: P200 Infrared Observations
  54. GRB100807A: optical observation in CrAO
  55. GRB 100805A: optical observation in CrAO
  56. GRB 100807A: Swift XRT refined analysis
  57. GRB 100807A: P60 Optical Afterglow Discovery
  58. GRB 100807A: Swift/UVOT Upper Limits
  59. GRB 100807A: Enhanced Swift-XRT position
  60. GRB 100807A: Swift-BAT refined analysis
  61. GRB 100807A: ROTSE-III Optical Limits
  62. GRB 100807A: Swift detection of a burst
  63. GRB 100805A: Early RAPTOR Observations
  64. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  65. Swift-BAT trigger 430975 is not a burst
  66. GRB 100805A: Swift-BAT refined analysis
  67. GRB 100805A: Swift-XRT Refined Analysis
  68. Trigger 430975: Swift detection of a possible burst
  69. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  70. GRB 100805A: Enhanced Swift-XRT position
  71. GRB 100805A: Liverpool Telescope afterglow observations
  72. GRB 100805A: P60 Optical Afterglow Candidate
  73. GRB 100805A: Enhanced Swift-XRT position
  74. GRB 100805A: ROTSE-III Optical Limits
  75. GRB 100805A: Swift detection of a burst with an optical counterpart
  76. GRB 100802A: Fermi GBM observation
  77. GRB 100728B: optical photometry of ISON-NM
  78. GRB 100802A: XRT refined analysis
  79. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  80. GRB 100728A: Suzaku WAM observation of the prompt emission
  81. GRB 100802A: Enhanced Swift-XRT position
  82. GRB 100802A: Swift-BAT refined analysis
  83. GRB 100802A: Liverpool Telescope observations
  84. GRB 100802A: ROTSE-III Optical Limits
  85. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  86. GRB 100802A: Swift detection of a burst
  87. GRB 100725B: TELMA optical observation
  88. GRB 100728B: Swift/UVOT Observations (correction to GCN 11028)
  89. GRB 100728B: Swift/UVOT Observations (correction)
  90. GRB 100728B: Swift/UVOT Observations
  91. GRB 100728B: Lick Observations
  92. GRB 100728B, Swift-BAT refined analysis
  93. GRB 100728B: Swift-XRT Refined Analysis
  94. Konus-Wind observation of GRB 100728A
  95. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  96. GRB 100727A: Swift/UVOT Upper Limits
  97. GRB 100728A, Swift-BAT refined analysis
  98. GRB 100728B: Enhanced Swift-XRT position
  99. GRB 100728A: Swift/UVOT Upper Limits
  100. GRB 100728B: Fermi GBM observation

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