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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"

19596 results found.

  1. GRB 100805A: Enhanced Swift-XRT position
  2. GRB 100805A: ROTSE-III Optical Limits
  3. GRB 100805A: Swift detection of a burst with an optical counterpart
  4. GRB 100802A: Fermi GBM observation
  5. GRB 100728B: optical photometry of ISON-NM
  6. GRB 100802A: XRT refined analysis
  7. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  8. GRB 100728A: Suzaku WAM observation of the prompt emission
  9. GRB 100802A: Enhanced Swift-XRT position
  10. GRB 100802A: Swift-BAT refined analysis
  11. GRB 100802A: Liverpool Telescope observations
  12. GRB 100802A: ROTSE-III Optical Limits
  13. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  14. GRB 100802A: Swift detection of a burst
  15. GRB 100725B: TELMA optical observation
  16. GRB 100728B: Swift/UVOT Observations (correction to GCN 11028)
  17. GRB 100728B: Swift/UVOT Observations (correction)
  18. GRB 100728B: Swift/UVOT Observations
  19. GRB 100728B: Lick Observations
  20. GRB 100728B, Swift-BAT refined analysis
  21. GRB 100728B: Swift-XRT Refined Analysis
  22. Konus-Wind observation of GRB 100728A
  23. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  24. GRB 100727A: Swift/UVOT Upper Limits
  25. GRB 100728A, Swift-BAT refined analysis
  26. GRB 100728B: Enhanced Swift-XRT position
  27. GRB 100728A: Swift/UVOT Upper Limits
  28. GRB 100728B: Fermi GBM observation
  29. GRB 100728A: Swift-XRT refined analysis
  30. GRB 100728B: GROND Detection of the NIR Afterglow
  31. GRB 100728B: optical detection
  32. GRB 100728B: Skynet/PROMPT Detections (correction)
  33. GRB 100728B: KAIT optical afterglow detection (correction)
  34. GRB 100728B: Swift detection of a burst with an optical counterpart
  35. GRB 100728A: Skynet/PROMPT Detections
  36. GRB 100728A: Fermi GBM observation
  37. GRB 100728A: Enhanced Swift-XRT position
  38. GRB 100728A: Swift detection of a burst
  39. GRB 100727A: Swift XRT refined analysis
  40. GRB 100727A: Fermi GBM observation
  41. GRB 100727A, Swift-BAT refined analysis
  42. GRB 100727A: Enhanced Swift-XRT position
  43. GRB100727A: MOA optical upper limit
  44. GRB 100727A: Swift detection of a burst
  45. GRB 100725B: Swift-BAT refined analysis
  46. GRB 100725B: refined XRT analysis
  47. GRB 100725B: Swift/UVOT Upper Limits
  48. GRB 100725A: Swift/UVOT Upper Limits
  49. GRB 100725A: Swift-BAT refined analysis
  50. GRB 100725A: Swift XRT refined analysis
  51. GRB 100725B: Enhanced Swift-XRT position
  52. GRB 100725A: Enhanced Swift-XRT position
  53. GRB100725B: Faulkes Telescope North observations
  54. GRB 100725B: Swift detection of a burst
  55. GRB 100725A: Prompt enhanced Swift-XRT position
  56. GRB 100725A: Swift detection of a burst
  57. GRB 100724A: Swift/BAT spectral lag results
  58. GRB 100724A: Swift XRT refined analysis
  59. GRB 100724A: Enhanced Swift-XRT position
  60. GRB 100724A: Swift/UVOT observations
  61. GRB 100724A: Swift-BAT refined analysis
  62. GRB 100724A, GROND detection of an afterglow candidate
  63. GRB 100724A: Swift detection of a burst
  64. GRB 100614A: 10.4-m GTC deep-optical limit
  65. GRB 100719A: Swift-BAT refined analysis
  66. GRB 100719A: Swift detection of a burst
  67. GRB 100713A: Swift XRT refined analysis
  68. GRB 100713A : IRSF/SIRIUS NIR upper limits
  69. GRB100713A: Swift/UVOT observations
  70. GRB 100713A: GROND upper limits
  71. GRB 100713A: optical upper limit
  72. GRB 100713A: TELMA and 1.5m OSN optical observations
  73. GRB100713A: Swift X-ray afterglow detection
  74. GRB 100628A: Chandra observations
  75. GRB 100628A: Swift XRT/UVOT refined analysis
  76. Tentative redshift of GRB100704A from Swift-XRT data
  77. Konus-Wind observation of GRB 100704A
  78. GRB 100704A: Swift XRT refined analysis
  79. GRB 100704: Swift/UVOT Upper Limits
  80. GRB 100704A: Fermi GBM observation
  81. GRB 100704A: Swift-BAT refined analysis
  82. GRB100704A: MOA optical upper limit
  83. GRB 100704A: Enhanced Swift-XRT position
  84. GRB 100704A: Swift detection of a burst
  85. GRB 100702A, Swift-BAT refined analysis
  86. GRB 100702A: Swift XRT refined analysis
  87. Swift/UVOT observations of GRB100702A - correction
  88. Swift/UVOT observations of GRB100702A
  89. GRB 100702: ROTSE-III Optical Limits
  90. GRB 100702A: Swift detection of a short burst
  91. GRB 100615A: Chandra X-ray ToO Observation
  92. GRB 100213B: Detection of Fading Optical Afterglow
  93. GRB 100625A: Fermi GBM detection
  94. GRB 100628A: Swift XRT refined position
  95. GRB100625A: GROND confirmation of constant source
  96. GRB100628A : MOA optical upper limit
  97. GRB 100628A: Swift/UVOT Upper Limits
  98. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  99. GRB 100628A: INTEGRAL SPI-ACS light curve
  100. GRB 100628A: Swift-BAT refined analysis

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Download all Circulars as a .tar.gz archive (updated once a day):
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