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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"

26164 results found.

  1. GRB 100728B: Continued KAIT observations
  2. GRB 100728B, Swift-BAT refined analysis
  3. GRB 100728B: Swift-XRT Refined Analysis
  4. Konus-Wind observation of GRB 100728A
  5. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  6. GRB 100727A: Swift/UVOT Upper Limits
  7. GRB 100728A, Swift-BAT refined analysis
  8. GRB 100728A: Swift/UVOT Upper Limits
  9. GRB 100728B: Fermi GBM observation
  10. GRB 100728A: Swift-XRT refined analysis
  11. GRB 100728B: GROND Detection of the NIR Afterglow
  12. GRB 100728B: Skynet/PROMPT Detections (correction)
  13. GRB 100728B: KAIT optical afterglow detection (correction)
  14. GRB 100728B: Swift detection of a burst with an optical counterpart
  15. GRB 100728A: Skynet/PROMPT Detections
  16. GRB 100728A: KAIT optical afterglow detection
  17. GRB 100728A: Fermi GBM observation
  18. GRB 100728A: Swift detection of a burst
  19. GRB 100727A: Swift XRT refined analysis
  20. GRB 100727A: Fermi GBM observation
  21. GRB 100727A, Swift-BAT refined analysis
  22. GRB 100727A: Swift detection of a burst
  23. GRB 100724B: Suzaku WAM observation of the prompt emission
  24. GRB 100725B: Swift-BAT refined analysis
  25. GRB 100725B: refined XRT analysis
  26. GRB 100725A: GROND upper limits
  27. GRB 100725B: Swift/UVOT Upper Limits
  28. GRB 100725A: Swift/UVOT Upper Limits
  29. GRB 100725A: Swift-BAT refined analysis
  30. GRB 100725A: Swift XRT refined analysis
  31. GRB100725B: Faulkes Telescope North observations
  32. GRB 100725B: Swift detection of a burst
  33. GRB100725A Faulkes Telescope South observations
  34. Konus-Wind observation of GRB 100724B
  35. GRB 100725A: Swift detection of a burst
  36. GRB 100724B: Fermi LAT and GBM analysis
  37. GRB 100724B: Fermi GBM detection
  38. GRB 100724A: Swift XRT refined analysis
  39. GRB 100724A: Swift/UVOT observations
  40. GRB 100724A: Swift-BAT refined analysis
  41. GRB 100724A, GROND detection of an afterglow candidate
  42. GRB 100724A: Swift detection of a burst
  43. GRB 100614A: 10.4-m GTC deep-optical limit
  44. GRB 100722A: Fermi GBM detection
  45. GRB 100718A: MASTER-Net optical prompt and alert observations
  46. GRB 100719A: Swift-BAT refined analysis
  47. GRB 100719A: Swift detection of a burst
  48. GRB 100713A: Swift XRT refined analysis
  49. Fermi GBM trigger 300794561 (100714419) is not a GRB
  50. GRB100713A: Swift/UVOT observations
  51. GRB 100713A: GROND upper limits
  52. GRB100713A: Swift X-ray afterglow detection
  53. GRB 100707A: Suzaku WAM observation of the prompt emission
  54. Fermi GBM trigger 300370702 (100709513) is not a GRB
  55. Konus-Wind observation of GRB 100707A
  56. GRB 100707A: Fermi GBM detection
  57. Tentative redshift of GRB100704A from Swift-XRT data
  58. Konus-Wind observation of GRB 100704A
  59. GRB 100703A: a short GRB detected by INTEGRAL
  60. GRB 100704A: Swift XRT refined analysis
  61. GRB 100704: Swift/UVOT Upper Limits
  62. GRB 100704A: Fermi GBM observation
  63. GRB 100704A: Swift-BAT refined analysis
  64. GRB 100704A: Swift detection of a burst
  65. GRB 100702A, Swift-BAT refined analysis
  66. Fermi GBM trigger 299767472 (100702531) is not a GRB
  67. GRB 100702A: Swift XRT refined analysis
  68. Swift/UVOT observations of GRB100702A
  69. GRB 100701B: Fermi GBM detection
  70. GRB 100702: ROTSE-III Optical Limits
  71. GRB 100702A: Swift detection of a short burst
  72. GRB 100625A: Fermi GBM detection
  73. GRB 100628A: GROND optical/NIR observations of the host candidate
  74. GRB 100628A: Swift XRT refined position
  75. GRB100625A: GROND confirmation of constant source
  76. GRB 100628A: Swift/UVOT Upper Limits
  77. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  78. GRB 100628A: Swift-BAT refined analysis
  79. GRB 100628A: Swift detection of a short hard burst
  80. Swift-BAT trigger 426048 is not a burst
  81. GRB 100625A: Swift/UVOT Upper Limits
  82. GRB 100625A: Swift-BAT refined analysis
  83. Konus-Wind observation of GRB 100625A
  84. GRB 100625A: Swift-XRT Team refined analysis
  85. GRB100625A : MOA optical upper limit
  86. GRB 100625A: Swift detection of a short hard burst
  87. Konus-Wind observation of GRB 100621A
  88. GRB 100621A: IRSF/SIRIUS NIR Observation
  89. GRB 100619A: Correction to the Fermi GBM trigger time
  90. GRB 100621A: Swift/UVOT observations
  91. GRB 100621A: Swift XRT refined analysis
  92. GRB 100621A: Swift-BAT refined analysis
  93. GRB 100621A: GROND observation of bright NIR afterglow
  94. GRB 100621A: ROTSE-III Optical Limits
  95. GRB 100621A: Swift detection of a burst
  96. GRB 100606A: Optical Limits
  97. GRB 100619A: Fermi GBM detection
  98. GRB 100619A: Swift/UVOT Upper Limits
  99. GRB 100619A: Swift-XRT refind analysis
  100. GRB 100619A: Swift-BAT refined analysis

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