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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"

19599 results found.

  1. Trigger 430975: Swift detection of a possible burst
  2. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  3. GRB 100805A: Enhanced Swift-XRT position
  4. GRB 100805A: Liverpool Telescope afterglow observations
  5. GRB 100805A: P60 Optical Afterglow Candidate
  6. GRB 100805A: Enhanced Swift-XRT position
  7. GRB 100805A: ROTSE-III Optical Limits
  8. GRB 100805A: Swift detection of a burst with an optical counterpart
  9. GRB 100802A: Fermi GBM observation
  10. GRB 100728B: optical photometry of ISON-NM
  11. GRB 100802A: XRT refined analysis
  12. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  13. GRB 100728A: Suzaku WAM observation of the prompt emission
  14. GRB 100802A: Enhanced Swift-XRT position
  15. GRB 100802A: Swift-BAT refined analysis
  16. GRB 100802A: Liverpool Telescope observations
  17. GRB 100802A: ROTSE-III Optical Limits
  18. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  19. GRB 100802A: Swift detection of a burst
  20. GRB 100725B: TELMA optical observation
  21. GRB 100728B: Swift/UVOT Observations (correction to GCN 11028)
  22. GRB 100728B: Swift/UVOT Observations (correction)
  23. GRB 100728B: Swift/UVOT Observations
  24. GRB 100728B: Lick Observations
  25. GRB 100728B, Swift-BAT refined analysis
  26. GRB 100728B: Swift-XRT Refined Analysis
  27. Konus-Wind observation of GRB 100728A
  28. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  29. GRB 100727A: Swift/UVOT Upper Limits
  30. GRB 100728A, Swift-BAT refined analysis
  31. GRB 100728B: Enhanced Swift-XRT position
  32. GRB 100728A: Swift/UVOT Upper Limits
  33. GRB 100728B: Fermi GBM observation
  34. GRB 100728A: Swift-XRT refined analysis
  35. GRB 100728B: GROND Detection of the NIR Afterglow
  36. GRB 100728B: optical detection
  37. GRB 100728B: Skynet/PROMPT Detections (correction)
  38. GRB 100728B: KAIT optical afterglow detection (correction)
  39. GRB 100728B: Swift detection of a burst with an optical counterpart
  40. GRB 100728A: Skynet/PROMPT Detections
  41. GRB 100728A: Fermi GBM observation
  42. GRB 100728A: Enhanced Swift-XRT position
  43. GRB 100728A: Swift detection of a burst
  44. GRB 100727A: Swift XRT refined analysis
  45. GRB 100727A: Fermi GBM observation
  46. GRB 100727A, Swift-BAT refined analysis
  47. GRB 100727A: Enhanced Swift-XRT position
  48. GRB100727A: MOA optical upper limit
  49. GRB 100727A: Swift detection of a burst
  50. GRB 100725B: Swift-BAT refined analysis
  51. GRB 100725B: refined XRT analysis
  52. GRB 100725B: Swift/UVOT Upper Limits
  53. GRB 100725A: Swift/UVOT Upper Limits
  54. GRB 100725A: Swift-BAT refined analysis
  55. GRB 100725A: Swift XRT refined analysis
  56. GRB 100725B: Enhanced Swift-XRT position
  57. GRB 100725A: Enhanced Swift-XRT position
  58. GRB100725B: Faulkes Telescope North observations
  59. GRB 100725B: Swift detection of a burst
  60. GRB 100725A: Prompt enhanced Swift-XRT position
  61. GRB 100725A: Swift detection of a burst
  62. GRB 100724A: Swift/BAT spectral lag results
  63. GRB 100724A: Swift XRT refined analysis
  64. GRB 100724A: Enhanced Swift-XRT position
  65. GRB 100724A: Swift/UVOT observations
  66. GRB 100724A: Swift-BAT refined analysis
  67. GRB 100724A, GROND detection of an afterglow candidate
  68. GRB 100724A: Swift detection of a burst
  69. GRB 100614A: 10.4-m GTC deep-optical limit
  70. GRB 100719A: Swift-BAT refined analysis
  71. GRB 100719A: Swift detection of a burst
  72. GRB 100713A: Swift XRT refined analysis
  73. GRB 100713A : IRSF/SIRIUS NIR upper limits
  74. GRB100713A: Swift/UVOT observations
  75. GRB 100713A: GROND upper limits
  76. GRB 100713A: optical upper limit
  77. GRB 100713A: TELMA and 1.5m OSN optical observations
  78. GRB100713A: Swift X-ray afterglow detection
  79. GRB 100628A: Chandra observations
  80. GRB 100628A: Swift XRT/UVOT refined analysis
  81. Tentative redshift of GRB100704A from Swift-XRT data
  82. Konus-Wind observation of GRB 100704A
  83. GRB 100704A: Swift XRT refined analysis
  84. GRB 100704: Swift/UVOT Upper Limits
  85. GRB 100704A: Fermi GBM observation
  86. GRB 100704A: Swift-BAT refined analysis
  87. GRB100704A: MOA optical upper limit
  88. GRB 100704A: Enhanced Swift-XRT position
  89. GRB 100704A: Swift detection of a burst
  90. GRB 100702A, Swift-BAT refined analysis
  91. GRB 100702A: Swift XRT refined analysis
  92. Swift/UVOT observations of GRB100702A - correction
  93. Swift/UVOT observations of GRB100702A
  94. GRB 100702: ROTSE-III Optical Limits
  95. GRB 100702A: Swift detection of a short burst
  96. GRB 100615A: Chandra X-ray ToO Observation
  97. GRB 100213B: Detection of Fading Optical Afterglow
  98. GRB 100625A: Fermi GBM detection
  99. GRB 100628A: Swift XRT refined position
  100. GRB100625A: GROND confirmation of constant source

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