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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"

19670 results found.

  1. GRB 130420A: Swift-XRT refined Analysis
  2. GRB 130420B: Enhanced Swift-XRT position
  3. GRB 130420B, Swift-BAT refined analysis
  4. GRB 130420A, Swift-BAT refined analysis
  5. Konus-Wind observation of GRB 130418A
  6. GRB 130420A: Enhanced Swift-XRT position
  7. GRB 130420B: MASTER-Net optical observations
  8. GRB 130420B: Swift detection of a burst
  9. GRB 130420A: RATIR Optical and NIR Observations
  10. GRB 130420A: PAIRITEL NIR detections
  11. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  12. GRB 130420A: Swift detection of a burst with an optical counterpart
  13. GRB 130420A: Faulkes Telescope North candidate
  14. GRB 130418A: Swift-XRT refined Analysis
  15. Swift Trigger 553930 is not an astrophysical source
  16. GRB 130419A, Swift-BAT refined analysis
  17. GRB 130327B: Swift/XRT source is not the afterglow
  18. GRB 130419B (Swift trigger Trigger 553930): MASTER-Net optical observations
  19. Trigger 553930: Swift detection of a possible flare from HR 5110
  20. GRB 130418A, Swift-BAT refined analysis
  21. GRB 130419A: Swift detection of a burst
  22. GRB 130418A: RATIR Optical and NIR Observations
  23. GRB 130418A: GROND detection of the optical-NIR afterglow
  24. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  25. GRB 130418A: Enhanced Swift-XRT position
  26. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  27. GRB 130418A: Bassano Bresciano Observatory optical observations
  28. GRB 130418A: Swift detection of a burst with an optical counterpart
  29. GRB 130408a: Skynet Optical Observations
  30. GRB 130408A, Swift-BAT refined analysis
  31. GRB 130408A: Zadko observatory - Gingin optical observations
  32. GRB 130407A: Swift-XRT observations
  33. GRB130408A: Swift/UVOT followup observations
  34. GRB 130408A: Swift-XRT refined Analysis
  35. Konus-Wind observation of GRB 130408A
  36. GRB 130408A: Enhanced Swift-XRT position
  37. GRB 130408A: GROND detection of the afterglow
  38. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow
  39. GRB 130408A: Liverpool Telescope Optical candidate detection
  40. GRB 130408A: Swift detection of a burst
  41. GRB 130407A Tiled Swift observations
  42. GRB 130211A: Retraction of afterglow candidate
  43. GRB 130327B: Suzaku WAM observation of the prompt emission
  44. Swift detection of IGR J18245-2452
  45. IPN Triangulation of GRB 130320B (very long/bright)
  46. Swift/XRT observation of GRB 130327B
  47. GRB 130306A: Confirmation of the X-ray Afterglow
  48. Swift Trigger 552142 is a noise event
  49. GRB 130327B: Fermi-LAT detection of a burst
  50. Swift Trigger 552142: a possible GRB
  51. GRB 130327A: Swift-BAT refined analysis
  52. GRB 130327A: Swift-XRT refined Analysis
  53. GRB 130327A: Swift/UVOT Upper Limits
  54. GRB 130327A: ISON-NM optical upper limit
  55. GRB 130325A Tiled Swift observations
  56. GRB 130327A: Enhanced Swift-XRT position
  57. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  58. GRB 130325A: Fermi LAT detection
  59. GRB 130327A: Swift detection of a burst
  60. report: GRB 130315A: Zadko observatory - Gingin optical observations
  61. GRB 130315A: GROND afterglow candidate
  62. GRB 130305A: optical upper limit in Mondy observatory
  63. GRB 130315A: Swift/UVOT Upper Limits
  64. GRB 130313A: optical upper limit in CrAO
  65. GRB 130313A: optical upper limit in Mondy observatory
  66. GRB 130315A: SALT optical observations
  67. GRB 130315A: Swift-XRT refined Analysis
  68. Swift XRT observations of GRB 130310A
  69. GRB 130315A, Swift-BAT refined analysis
  70. GRB 130313A: Swift/UVOT Upper Limits
  71. GRB 130305A: PTF P48 optical upper limits
  72. GRB130315A BOOTES-3 optical limit
  73. GRB 130315A: Swift detection of a burst
  74. GRB 130305A: TLS Tautenburg observations
  75. GRB 130313A: RATIR Optical and NIR Observations
  76. GRB 130313A: Swift-BAT Spectral lag analysis
  77. GRB 130313A: Fading X-ray Afterglow
  78. Swift-BAT trigger 551030 is not astrophysical
  79. GRB 130313A: Swift-XRT refined Analysis
  80. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  81. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  82. GRB 130313A: Swift-BAT refined analysis
  83. GRB 130313A: Zadko observatory - Gingin optical observations
  84. GRB 130313A: MASTER-Net optical observations
  85. GRB 130313A: Swift detection of a short burst
  86. IPN Triangulation of GRB 130307A
  87. Swift XRT RETRACTION of GRB 130310A afterglow detection
  88. Swift XRT observations of GRB 130310A
  89. GRB 130306A: Swift Detection of a Possible Afterglow
  90. GRB 130306A: Swift-BAT refined analysis
  91. IPN triangulation of GRB 130228A
  92. GRB 130305A BAT refined circular
  93. GRB 130305A: Further Swift-XRT Observations
  94. Konus-Wind observation of GRB 130306A
  95. GRB 130305A: Optical Observations
  96. GRB 130306A: Fermi GBM observation
  97. GRB 130306A: MASTER-Net pre-Swift alert observation
  98. GRB 130305A: Swift/UVOT Upper Limit
  99. GRB 130305A: RATIR Observations
  100. GRB 130306A: Swift detection of a burst

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