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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"

19600 results found.

  1. GRB 080727: Swift detection of a burst
  2. GRB 080725, Swift-BAT refined analysis
  3. GRB 080723A: optical upper limit
  4. GRB080723B: Swift/UVOT Upper Limits
  5. GRB 080725: Swift detection of a burst
  6. GRB 080723A: Swift/UVOT Upper Limits
  7. GRB 080723B - correction to flux conversion factor
  8. GRB 080723B - Swift-XRT refined analysis
  9. GRB 080723B - Swift-XRT position
  10. GRB 080723, Swift-BAT refined analysis
  11. GRB 080723A: Swift-XRT refined analysis
  12. GRB 080723: Enhanced Swift-XRT position
  13. GRB 080723: Swift detection of a burst
  14. TNG/DOLORES redshift for GRB080721
  15. GRB 080721: UVOT Follow-Up Observations
  16. Konus-Wind observation of GRB 080721
  17. GRB 080721: Swift-XRT refined analysis
  18. GRB 080721: Enhanced Swift-XRT position
  19. GRB 080721, Swift-BAT refined analysis
  20. GRB 080721: Swift/UVOT Photometric Redshift
  21. GRB 080721: Swift-XRT correct position
  22. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  23. Retraction of Swift Trigger 317393
  24. Trigger 317393: Swift detection of a possible GRB
  25. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  26. GRB 080714: GROND confirmation of the optical/NIR afterglow
  27. Konus-Wind observation of GRB 080714
  28. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  29. GRB 080714: Swift-XRT refined analysis
  30. GRB 080714: Enhanced Swift-XRT position
  31. GRB 080714: Swift-BAT refined analysis
  32. GRB 080714: Swift detection of a burst
  33. GRB 080603B: optical observations in MAO
  34. GRB 080603B: optical observations in CrAO
  35. GRB 080710: TLS observations, steepening afterglow decay
  36. GRB 080702B: Swift XRT confirmation of the afterglow
  37. GRB 080710, Swift-BAT refined analysis
  38. GRB 080710: Swift-XRT refined analysis
  39. GRB080710: Swift/UVOT observations
  40. GRB 080710: Enhanced Swift-XRT position
  41. UVOT white band observations of GRB080710
  42. GRB 080710: KAIT OA candidate
  43. GRB 080710: Swift XRT position
  44. GRB 080710: Swift detection of a burst
  45. GRB 080707: possible break in the X-rays
  46. New Swift-XRT GRB products available online.
  47. GRB 080707: GROND Confirmation of the Optical Afterglow
  48. UVOT observations of GRB080707
  49. GRB 080707, Swift-BAT refined analysis
  50. GRB 080707: Swift XRT refined analysis
  51. GRB 080707: Enhanced Swift-XRT position
  52. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  53. GRB 080707: Swift detection of a burst
  54. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  55. Trigger 316063: Swift detection of a transient
  56. GRB 080703: GROND Upper Limits
  57. GRB 080702B: GROND Upper Limits
  58. GRB 080703: Swift-XRT refined analysis
  59. GRB 080703: UVOT Follow-Up Observation
  60. GRB 080703: Enhanced Swift-XRT position
  61. GRB 080703, Swift-BAT refined analysis
  62. GRB 080702B Swift-BAT refined analysis
  63. GRB 080703: Swift detection of a burst with optical afterglow
  64. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  65. Swift/UVOT observation of GRB080702A
  66. GRB 080702B: Swift XRT and UVOT observations
  67. GRB 080701A: Early RAPTOR optical limits
  68. Swift Trigger 315630: Swift/UVOT Upper Limits
  69. GRB 080702A, Swift-BAT refined analysis
  70. GRB 080702A: Swift-XRT Team refined analysis
  71. GRB 080702B : Burst detected in BAT during Swift slew
  72. GRB 080702A: Enhanced Swift-XRT position
  73. Swift Trigger 315630: TLS R-band observation
  74. Swift Trigger 315630: Probably not a GRB
  75. GRB 080702: Swift detection of a short burst
  76. GRB 080701: Swift-XRT refined analysis
  77. TLS I-Band Observation of GRB 080701A
  78. GRB 080701A: Swift/UVOT Upper Limits
  79. GRB 080701: Enhanced Swift-XRT position
  80. GRB 080701A, Swift-BAT refined analysis
  81. Trigger 315630: Swift detection of a possible burst
  82. GRB 080701: Swift-XRT Prompt Analysis
  83. GRB 080701: Swift detection of a burst
  84. GRB 080623: Suzaku WAM observation of the prompt emission
  85. GRB 080625: Swift/UVOT Follow-Up Observations
  86. GRB 080625:Swift-XRT detection of the afterglow
  87. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  88. GRB 080623: GROND upper limits
  89. GRB080623: Swift UVOT followup observations
  90. GRB 080623: Swift-XRT refined analysis
  91. GRB 080623, Swift-BAT refined analysis
  92. GRB 080623: Enhanced Swift-XRT position
  93. GRB 080623: TAROT La Silla observatory optical observations
  94. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  95. GRB 080623: Swift XRT prompt analysis
  96. GRB 080623: Swift detection of a burst
  97. Swift trigger 314975 is not a GRB
  98. Swift-BAT trigger 314975 possible burst
  99. GRB080607: optical observation
  100. GRB 080603b: optical observation

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