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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"

19344 results found.

  1. GRB 100816A: Swift UVOT Observations
  2. GRB100816A Swift-XRT refined analysis
  3. GRB 100816A: Swift-BAT spectral lag results
  4. GRB 100816A: 1.23m CAHA optical observations
  5. GRB 100816A, Swift-BAT refined analysis
  6. GRB 100816A: Enhanced Swift-XRT position
  7. GRB100814A - interesting UVOT lightcurve.
  8. GRB 100816A: TAROT Calern observatory optical detection
  9. GRB100816A: TNG optical afterglow confirmation.
  10. GRB 100816A: ROTSE-III Optical Limits
  11. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  12. Swift-BAT trigger 431756 is not a burst
  13. Swift/UVOT observations of GRB100814A - title correction to GCN 11097
  14. GRB 100814A: Fermi GBM observation
  15. Swift/UVOT Observations of GRB100814A - a clearer table.
  16. GRB 100814A: Swift-XRT refined analysis
  17. Swift/UVOT observations of GRB100814A
  18. GRB 100814A, Swift-BAT refined analysis
  19. GRB 100814A: Enhanced Swift-XRT position
  20. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  21. GRB 100814A: IAC80 R-band observations
  22. GRB 100814A: Swift UVOT observations of the optical afterglow
  23. GRB 100814A: Swift detection of a burst with an optical afterglow
  24. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  25. Swift-BAT trigger 431582 likely is IGR J17464-2811
  26. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  27. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  28. GRB 100807A: P200 Infrared Observations
  29. GRB100807A: optical observation in CrAO
  30. GRB 100805A: optical observation in CrAO
  31. GRB 100807A: Swift XRT refined analysis
  32. GRB 100807A: P60 Optical Afterglow Discovery
  33. GRB 100807A: Swift/UVOT Upper Limits
  34. GRB 100807A: Enhanced Swift-XRT position
  35. GRB 100807A: Swift-BAT refined analysis
  36. GRB 100807A: ROTSE-III Optical Limits
  37. GRB 100807A: Swift detection of a burst
  38. GRB 100805A: Early RAPTOR Observations
  39. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  40. Swift-BAT trigger 430975 is not a burst
  41. GRB 100805A: Swift-BAT refined analysis
  42. GRB 100805A: Swift-XRT Refined Analysis
  43. Trigger 430975: Swift detection of a possible burst
  44. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  45. GRB 100805A: Enhanced Swift-XRT position
  46. GRB 100805A: Liverpool Telescope afterglow observations
  47. GRB 100805A: P60 Optical Afterglow Candidate
  48. GRB 100805A: Enhanced Swift-XRT position
  49. GRB 100805A: ROTSE-III Optical Limits
  50. GRB 100805A: Swift detection of a burst with an optical counterpart
  51. GRB 100802A: Fermi GBM observation
  52. GRB 100728B: optical photometry of ISON-NM
  53. GRB 100802A: XRT refined analysis
  54. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  55. GRB 100728A: Suzaku WAM observation of the prompt emission
  56. GRB 100802A: Enhanced Swift-XRT position
  57. GRB 100802A: Swift-BAT refined analysis
  58. GRB 100802A: Liverpool Telescope observations
  59. GRB 100802A: ROTSE-III Optical Limits
  60. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  61. GRB 100802A: Swift detection of a burst
  62. GRB 100725B: TELMA optical observation
  63. GRB 100728B: Swift/UVOT Observations (correction to GCN 11028)
  64. GRB 100728B: Swift/UVOT Observations (correction)
  65. GRB 100728B: Swift/UVOT Observations
  66. GRB 100728B: Lick Observations
  67. GRB 100728B, Swift-BAT refined analysis
  68. GRB 100728B: Swift-XRT Refined Analysis
  69. Konus-Wind observation of GRB 100728A
  70. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  71. GRB 100727A: Swift/UVOT Upper Limits
  72. GRB 100728A, Swift-BAT refined analysis
  73. GRB 100728B: Enhanced Swift-XRT position
  74. GRB 100728A: Swift/UVOT Upper Limits
  75. GRB 100728B: Fermi GBM observation
  76. GRB 100728A: Swift-XRT refined analysis
  77. GRB 100728B: GROND Detection of the NIR Afterglow
  78. GRB 100728B: optical detection
  79. GRB 100728B: Skynet/PROMPT Detections (correction)
  80. GRB 100728B: KAIT optical afterglow detection (correction)
  81. GRB 100728B: Swift detection of a burst with an optical counterpart
  82. GRB 100728A: Skynet/PROMPT Detections
  83. GRB 100728A: Fermi GBM observation
  84. GRB 100728A: Enhanced Swift-XRT position
  85. GRB 100728A: Swift detection of a burst
  86. GRB 100727A: Swift XRT refined analysis
  87. GRB 100727A: Fermi GBM observation
  88. GRB 100727A, Swift-BAT refined analysis
  89. GRB 100727A: Enhanced Swift-XRT position
  90. GRB100727A: MOA optical upper limit
  91. GRB 100727A: Swift detection of a burst
  92. GRB 100725B: Swift-BAT refined analysis
  93. GRB 100725B: refined XRT analysis
  94. GRB 100725B: Swift/UVOT Upper Limits
  95. GRB 100725A: Swift/UVOT Upper Limits
  96. GRB 100725A: Swift-BAT refined analysis
  97. GRB 100725A: Swift XRT refined analysis
  98. GRB 100725B: Enhanced Swift-XRT position
  99. GRB 100725A: Enhanced Swift-XRT position
  100. GRB100725B: Faulkes Telescope North observations

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