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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"

19611 results found.

  1. GRB 100807A: Swift XRT refined analysis
  2. GRB 100807A: P60 Optical Afterglow Discovery
  3. GRB 100807A: Swift/UVOT Upper Limits
  4. GRB 100807A: Enhanced Swift-XRT position
  5. GRB 100807A: Swift-BAT refined analysis
  6. GRB 100807A: ROTSE-III Optical Limits
  7. GRB 100807A: Swift detection of a burst
  8. GRB 100805A: Early RAPTOR Observations
  9. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  10. Swift-BAT trigger 430975 is not a burst
  11. GRB 100805A: Swift-BAT refined analysis
  12. GRB 100805A: Swift-XRT Refined Analysis
  13. Trigger 430975: Swift detection of a possible burst
  14. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  15. GRB 100805A: Enhanced Swift-XRT position
  16. GRB 100805A: Liverpool Telescope afterglow observations
  17. GRB 100805A: P60 Optical Afterglow Candidate
  18. GRB 100805A: Enhanced Swift-XRT position
  19. GRB 100805A: ROTSE-III Optical Limits
  20. GRB 100805A: Swift detection of a burst with an optical counterpart
  21. GRB 100802A: Fermi GBM observation
  22. GRB 100728B: optical photometry of ISON-NM
  23. GRB 100802A: XRT refined analysis
  24. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  25. GRB 100728A: Suzaku WAM observation of the prompt emission
  26. GRB 100802A: Enhanced Swift-XRT position
  27. GRB 100802A: Swift-BAT refined analysis
  28. GRB 100802A: Liverpool Telescope observations
  29. GRB 100802A: ROTSE-III Optical Limits
  30. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  31. GRB 100802A: Swift detection of a burst
  32. GRB 100725B: TELMA optical observation
  33. GRB 100728B: Swift/UVOT Observations (correction to GCN 11028)
  34. GRB 100728B: Swift/UVOT Observations (correction)
  35. GRB 100728B: Swift/UVOT Observations
  36. GRB 100728B: Lick Observations
  37. GRB 100728B, Swift-BAT refined analysis
  38. GRB 100728B: Swift-XRT Refined Analysis
  39. Konus-Wind observation of GRB 100728A
  40. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  41. GRB 100727A: Swift/UVOT Upper Limits
  42. GRB 100728A, Swift-BAT refined analysis
  43. GRB 100728B: Enhanced Swift-XRT position
  44. GRB 100728A: Swift/UVOT Upper Limits
  45. GRB 100728B: Fermi GBM observation
  46. GRB 100728A: Swift-XRT refined analysis
  47. GRB 100728B: GROND Detection of the NIR Afterglow
  48. GRB 100728B: optical detection
  49. GRB 100728B: Skynet/PROMPT Detections (correction)
  50. GRB 100728B: KAIT optical afterglow detection (correction)
  51. GRB 100728B: Swift detection of a burst with an optical counterpart
  52. GRB 100728A: Skynet/PROMPT Detections
  53. GRB 100728A: Fermi GBM observation
  54. GRB 100728A: Enhanced Swift-XRT position
  55. GRB 100728A: Swift detection of a burst
  56. GRB 100727A: Swift XRT refined analysis
  57. GRB 100727A: Fermi GBM observation
  58. GRB 100727A, Swift-BAT refined analysis
  59. GRB 100727A: Enhanced Swift-XRT position
  60. GRB100727A: MOA optical upper limit
  61. GRB 100727A: Swift detection of a burst
  62. GRB 100725B: Swift-BAT refined analysis
  63. GRB 100725B: refined XRT analysis
  64. GRB 100725B: Swift/UVOT Upper Limits
  65. GRB 100725A: Swift/UVOT Upper Limits
  66. GRB 100725A: Swift-BAT refined analysis
  67. GRB 100725A: Swift XRT refined analysis
  68. GRB 100725B: Enhanced Swift-XRT position
  69. GRB 100725A: Enhanced Swift-XRT position
  70. GRB100725B: Faulkes Telescope North observations
  71. GRB 100725B: Swift detection of a burst
  72. GRB 100725A: Prompt enhanced Swift-XRT position
  73. GRB 100725A: Swift detection of a burst
  74. GRB 100724A: Swift/BAT spectral lag results
  75. GRB 100724A: Swift XRT refined analysis
  76. GRB 100724A: Enhanced Swift-XRT position
  77. GRB 100724A: Swift/UVOT observations
  78. GRB 100724A: Swift-BAT refined analysis
  79. GRB 100724A, GROND detection of an afterglow candidate
  80. GRB 100724A: Swift detection of a burst
  81. GRB 100614A: 10.4-m GTC deep-optical limit
  82. GRB 100719A: Swift-BAT refined analysis
  83. GRB 100719A: Swift detection of a burst
  84. GRB 100713A: Swift XRT refined analysis
  85. GRB 100713A : IRSF/SIRIUS NIR upper limits
  86. GRB100713A: Swift/UVOT observations
  87. GRB 100713A: GROND upper limits
  88. GRB 100713A: optical upper limit
  89. GRB 100713A: TELMA and 1.5m OSN optical observations
  90. GRB100713A: Swift X-ray afterglow detection
  91. GRB 100628A: Chandra observations
  92. GRB 100628A: Swift XRT/UVOT refined analysis
  93. Tentative redshift of GRB100704A from Swift-XRT data
  94. Konus-Wind observation of GRB 100704A
  95. GRB 100704A: Swift XRT refined analysis
  96. GRB 100704: Swift/UVOT Upper Limits
  97. GRB 100704A: Fermi GBM observation
  98. GRB 100704A: Swift-BAT refined analysis
  99. GRB100704A: MOA optical upper limit
  100. GRB 100704A: Enhanced Swift-XRT position

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