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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"

19607 results found.

  1. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  2. Swift-BAT trigger 422437 is not anything astrophysical
  3. Swift Trigger 422437 is probably not a GRB
  4. GRB 100514A: optical afterglow confirmation
  5. GRB 100514A: Swift/UVOT Observations
  6. GRB 100514A: Swift XRT refined analysis
  7. GRB 100514A: MASTER-Net optical observations
  8. GRB 100514A: Enhanced Swift-XRT position
  9. GRB 100514A: Swift-BAT refined analysis
  10. GRB 100514A: Faulkes Telescope South observations
  11. GRB 100514A: Swift detection of a burst
  12. GRB 100513A: Faulkes Telescope South observations
  13. GRB 100513A: Swift/UVOT upper limits
  14. GRB 100513A, RIMOTS optical upper limits
  15. GRB 100513A: Swift XRT refined analysis
  16. GRB 100513A: Swift-BAT refined analysis
  17. GRB 100513A: Enhanced Swift-XRT position
  18. GRB 100513A: PAIRITEL NIR afterglow candidate
  19. GRB 100513A: Swift detection of a burst
  20. GRB 100511A: Super-LOTIS early observations
  21. Swift-BAT trigger 421695 is likely not astrophysical
  22. GRB 100511A, RIMOTS optical upper limits
  23. Trigger 421695: Swift detection of a possible burst
  24. GRB100508A: Further Swift/UVOT Observations
  25. GRB 100508A: GROND Detection of the optical afterglow
  26. GRB 100508A: Swift-XRT Refined analysis
  27. GRB 100508A: Swift-BAT refined analysis
  28. GRB 100508A: Enhanced Swift-XRT position
  29. GRB100508A: Swift/UVOT Detection of the Afterglow
  30. GRB 100508A: ROTSE-III Optical Limits
  31. GRB 100508A: Swift detection of a burst
  32. Swift-BAT refined analysis of trigger 421262
  33. GRB 100504A: Fermi GBM observation
  34. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  35. GRB 100504A: Swift/UVOT Observations
  36. GRB 100418A: Flattening of the Swift/UVOT Optical Light Curve
  37. GRB 100504A: Swift-XRT refined analysis
  38. GRB 100504A: Enhanced Swift-XRT position
  39. GRB 100504A: GROND Upper limits
  40. GRB 100504A: Swift-BAT refined analysis
  41. GRB 100504A: UVOT-enhanced XRT position
  42. GRB 100504A: Swift detection of a burst
  43. Swift-BAT trigger 421072 is not astrophyical
  44. INTEGRAL observations of Swift GRB trigger 421072
  45. GRB100423A : Suzaku WAM observation of the prompt emission
  46. Trigger 421072: Possible Swift detection of a GRB or transient
  47. GRB 100420A: Terskol optical upper limit
  48. GRB 100427A: Swift XRT and UVOT Upper Limits
  49. GRB 100427A: Fermi GBM detection
  50. GRB 100427A detected in ground analysis of Swift BAT data
  51. Konus-Wind observation of GRB 100423A
  52. GRB 100423A: CrAO optical observations
  53. GRB 100418A: Terskol optical observations
  54. GRB 100424A: CrAO optical observations
  55. GRB 100425A: Swift XRT refined analysis
  56. GRB100425A: Swift/UVOT Upper Limits
  57. GRB 100424A: Swift/UVOT Upper Limits
  58. GRB 100425A: Enhanced Swift-XRT position
  59. GRB 100425A: Swift-BAT refined analysis
  60. GRB 100425A: GROND afterglow observation
  61. GRB 100424A: D50 optical limits
  62. GRB 100424A : Lulin early z'-band upper limit
  63. GRB 100424A: GROND Upper Limits
  64. GRB 100424A: PAIRITEL NIR Upper Limits
  65. GRB 100424A: Swift-XRT refined analysis
  66. GRB 100425A: Swift detection of a burst
  67. GRB 100424A, Swift-BAT refined analysis
  68. GRB 100424A: Enhanced Swift-XRT position
  69. GRB 100424A: Prompt enhanced Swift-XRT position.
  70. GRB 100424A: Swift detection of a burst
  71. GRB 100420A: GRT Optical Observation
  72. Swift-BAT refined analysis of trigger 420256
  73. Swift Trigger 420256: D50 optical limits
  74. GRB 100418A: Possible Evidence for a Supernova
  75. GRB 100420A: Swift-BAT refined analysis
  76. GRB 100423A: Swift-BAT refined analysis
  77. Swift Trigger 420256: IAC80 R-band observations
  78. Swift Trigger 420256: BOOTES-2 observations
  79. Swift Trigger 420256: ROTSE-III Optical Limits
  80. Trigger 420256: Swift detection of a possible GRB
  81. GRB 100423A: Skynet/PROMPT Detections
  82. GRB 100423A: GROND discovery of afterglow
  83. GRB 100423A: Swift detection of a burst
  84. Radio afterglow detection of GRB 100418A with the EVLA
  85. GRB 100418A: Continued PAIRITEL NIR Observations
  86. GRB 100418A: Continuing Swift/UVOT Observations
  87. GRB 100420A: Swift/UVOT Upper Limits
  88. GRB 100420A: XRT refined analysis
  89. GRB 100420A: Enhanced Swift-XRT position
  90. GRB 100418A: optical observations
  91. GRB 100418A: MASTER-Net optical observations
  92. GRB 100414A: Confirmation of the X-ray afterglow
  93. GRB 100420A: ROTSE-III Optical Limits
  94. GRB 100420A: Swift detection of a burst
  95. GRB 100418A PAIRITEL NIR Observations
  96. GRB 100418A: ROVOR optical afterglow detection
  97. GRB 100418A: Swift/UVOT Observations
  98. GRB 100418A: Gemini-N redshift confirmation
  99. GRB 100418A: Swift-XRT Refined Analysis
  100. GRB 100418A: Swift-BAT refined analysis

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