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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"

19611 results found.

  1. GRB 100522A: Swift detection of a burst
  2. GRB 100418A: CrAO optical observations
  3. GRB 100518A: Swift/UVOT Upper Limits
  4. GRB 100518A: Swift-XRT refined analysis
  5. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  6. Swift-BAT trigger 422437 is not anything astrophysical
  7. Swift Trigger 422437 is probably not a GRB
  8. GRB 100514A: optical afterglow confirmation
  9. GRB 100514A: Swift/UVOT Observations
  10. GRB 100514A: Swift XRT refined analysis
  11. GRB 100514A: MASTER-Net optical observations
  12. GRB 100514A: Enhanced Swift-XRT position
  13. GRB 100514A: Swift-BAT refined analysis
  14. GRB 100514A: Faulkes Telescope South observations
  15. GRB 100514A: Swift detection of a burst
  16. GRB 100513A: Faulkes Telescope South observations
  17. GRB 100513A: Swift/UVOT upper limits
  18. GRB 100513A, RIMOTS optical upper limits
  19. GRB 100513A: Swift XRT refined analysis
  20. GRB 100513A: Swift-BAT refined analysis
  21. GRB 100513A: Enhanced Swift-XRT position
  22. GRB 100513A: PAIRITEL NIR afterglow candidate
  23. GRB 100513A: Swift detection of a burst
  24. GRB 100511A: Super-LOTIS early observations
  25. Swift-BAT trigger 421695 is likely not astrophysical
  26. GRB 100511A, RIMOTS optical upper limits
  27. Trigger 421695: Swift detection of a possible burst
  28. GRB100508A: Further Swift/UVOT Observations
  29. GRB 100508A: GROND Detection of the optical afterglow
  30. GRB 100508A: Swift-XRT Refined analysis
  31. GRB 100508A: Swift-BAT refined analysis
  32. GRB 100508A: Enhanced Swift-XRT position
  33. GRB100508A: Swift/UVOT Detection of the Afterglow
  34. GRB 100508A: ROTSE-III Optical Limits
  35. GRB 100508A: Swift detection of a burst
  36. Swift-BAT refined analysis of trigger 421262
  37. GRB 100504A: Fermi GBM observation
  38. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  39. GRB 100504A: Swift/UVOT Observations
  40. GRB 100418A: Flattening of the Swift/UVOT Optical Light Curve
  41. GRB 100504A: Swift-XRT refined analysis
  42. GRB 100504A: Enhanced Swift-XRT position
  43. GRB 100504A: GROND Upper limits
  44. GRB 100504A: Swift-BAT refined analysis
  45. GRB 100504A: UVOT-enhanced XRT position
  46. GRB 100504A: Swift detection of a burst
  47. Swift-BAT trigger 421072 is not astrophyical
  48. INTEGRAL observations of Swift GRB trigger 421072
  49. GRB100423A : Suzaku WAM observation of the prompt emission
  50. Trigger 421072: Possible Swift detection of a GRB or transient
  51. GRB 100420A: Terskol optical upper limit
  52. GRB 100427A: Swift XRT and UVOT Upper Limits
  53. GRB 100427A: Fermi GBM detection
  54. GRB 100427A detected in ground analysis of Swift BAT data
  55. Konus-Wind observation of GRB 100423A
  56. GRB 100423A: CrAO optical observations
  57. GRB 100418A: Terskol optical observations
  58. GRB 100424A: CrAO optical observations
  59. GRB 100425A: Swift XRT refined analysis
  60. GRB100425A: Swift/UVOT Upper Limits
  61. GRB 100424A: Swift/UVOT Upper Limits
  62. GRB 100425A: Enhanced Swift-XRT position
  63. GRB 100425A: Swift-BAT refined analysis
  64. GRB 100425A: GROND afterglow observation
  65. GRB 100424A: D50 optical limits
  66. GRB 100424A : Lulin early z'-band upper limit
  67. GRB 100424A: GROND Upper Limits
  68. GRB 100424A: PAIRITEL NIR Upper Limits
  69. GRB 100424A: Swift-XRT refined analysis
  70. GRB 100425A: Swift detection of a burst
  71. GRB 100424A, Swift-BAT refined analysis
  72. GRB 100424A: Enhanced Swift-XRT position
  73. GRB 100424A: Prompt enhanced Swift-XRT position.
  74. GRB 100424A: Swift detection of a burst
  75. GRB 100420A: GRT Optical Observation
  76. Swift-BAT refined analysis of trigger 420256
  77. Swift Trigger 420256: D50 optical limits
  78. GRB 100418A: Possible Evidence for a Supernova
  79. GRB 100420A: Swift-BAT refined analysis
  80. GRB 100423A: Swift-BAT refined analysis
  81. Swift Trigger 420256: IAC80 R-band observations
  82. Swift Trigger 420256: BOOTES-2 observations
  83. Swift Trigger 420256: ROTSE-III Optical Limits
  84. Trigger 420256: Swift detection of a possible GRB
  85. GRB 100423A: Skynet/PROMPT Detections
  86. GRB 100423A: GROND discovery of afterglow
  87. GRB 100423A: Swift detection of a burst
  88. Radio afterglow detection of GRB 100418A with the EVLA
  89. GRB 100418A: Continued PAIRITEL NIR Observations
  90. GRB 100418A: Continuing Swift/UVOT Observations
  91. GRB 100420A: Swift/UVOT Upper Limits
  92. GRB 100420A: XRT refined analysis
  93. GRB 100420A: Enhanced Swift-XRT position
  94. GRB 100418A: optical observations
  95. GRB 100418A: MASTER-Net optical observations
  96. GRB 100414A: Confirmation of the X-ray afterglow
  97. GRB 100420A: ROTSE-III Optical Limits
  98. GRB 100420A: Swift detection of a burst
  99. GRB 100418A PAIRITEL NIR Observations
  100. GRB 100418A: ROVOR optical afterglow detection

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