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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"

19663 results found.

  1. GRB 130420A: Enhanced Swift-XRT position
  2. GRB 130420B: MASTER-Net optical observations
  3. GRB 130420B: Swift detection of a burst
  4. GRB 130420A: RATIR Optical and NIR Observations
  5. GRB 130420A: PAIRITEL NIR detections
  6. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  7. GRB 130420A: Swift detection of a burst with an optical counterpart
  8. GRB 130420A: Faulkes Telescope North candidate
  9. GRB 130418A: Swift-XRT refined Analysis
  10. Swift Trigger 553930 is not an astrophysical source
  11. GRB 130419A, Swift-BAT refined analysis
  12. GRB 130327B: Swift/XRT source is not the afterglow
  13. GRB 130419B (Swift trigger Trigger 553930): MASTER-Net optical observations
  14. Trigger 553930: Swift detection of a possible flare from HR 5110
  15. GRB 130418A, Swift-BAT refined analysis
  16. GRB 130419A: Swift detection of a burst
  17. GRB 130418A: RATIR Optical and NIR Observations
  18. GRB 130418A: GROND detection of the optical-NIR afterglow
  19. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  20. GRB 130418A: Enhanced Swift-XRT position
  21. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  22. GRB 130418A: Bassano Bresciano Observatory optical observations
  23. GRB 130418A: Swift detection of a burst with an optical counterpart
  24. GRB 130408a: Skynet Optical Observations
  25. GRB 130408A, Swift-BAT refined analysis
  26. GRB 130408A: Zadko observatory - Gingin optical observations
  27. GRB 130407A: Swift-XRT observations
  28. GRB130408A: Swift/UVOT followup observations
  29. GRB 130408A: Swift-XRT refined Analysis
  30. Konus-Wind observation of GRB 130408A
  31. GRB 130408A: Enhanced Swift-XRT position
  32. GRB 130408A: GROND detection of the afterglow
  33. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow
  34. GRB 130408A: Liverpool Telescope Optical candidate detection
  35. GRB 130408A: Swift detection of a burst
  36. GRB 130407A Tiled Swift observations
  37. GRB 130211A: Retraction of afterglow candidate
  38. GRB 130327B: Suzaku WAM observation of the prompt emission
  39. Swift detection of IGR J18245-2452
  40. IPN Triangulation of GRB 130320B (very long/bright)
  41. Swift/XRT observation of GRB 130327B
  42. GRB 130306A: Confirmation of the X-ray Afterglow
  43. Swift Trigger 552142 is a noise event
  44. GRB 130327B: Fermi-LAT detection of a burst
  45. Swift Trigger 552142: a possible GRB
  46. GRB 130327A: Swift-BAT refined analysis
  47. GRB 130327A: Swift-XRT refined Analysis
  48. GRB 130327A: Swift/UVOT Upper Limits
  49. GRB 130327A: ISON-NM optical upper limit
  50. GRB 130325A Tiled Swift observations
  51. GRB 130327A: Enhanced Swift-XRT position
  52. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  53. GRB 130325A: Fermi LAT detection
  54. GRB 130327A: Swift detection of a burst
  55. report: GRB 130315A: Zadko observatory - Gingin optical observations
  56. GRB 130315A: GROND afterglow candidate
  57. GRB 130305A: optical upper limit in Mondy observatory
  58. GRB 130315A: Swift/UVOT Upper Limits
  59. GRB 130313A: optical upper limit in CrAO
  60. GRB 130313A: optical upper limit in Mondy observatory
  61. GRB 130315A: SALT optical observations
  62. GRB 130315A: Swift-XRT refined Analysis
  63. Swift XRT observations of GRB 130310A
  64. GRB 130315A, Swift-BAT refined analysis
  65. GRB 130313A: Swift/UVOT Upper Limits
  66. GRB 130305A: PTF P48 optical upper limits
  67. GRB130315A BOOTES-3 optical limit
  68. GRB 130315A: Swift detection of a burst
  69. GRB 130305A: TLS Tautenburg observations
  70. GRB 130313A: RATIR Optical and NIR Observations
  71. GRB 130313A: Swift-BAT Spectral lag analysis
  72. GRB 130313A: Fading X-ray Afterglow
  73. Swift-BAT trigger 551030 is not astrophysical
  74. GRB 130313A: Swift-XRT refined Analysis
  75. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  76. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  77. GRB 130313A: Swift-BAT refined analysis
  78. GRB 130313A: Zadko observatory - Gingin optical observations
  79. GRB 130313A: MASTER-Net optical observations
  80. GRB 130313A: Swift detection of a short burst
  81. IPN Triangulation of GRB 130307A
  82. Swift XRT RETRACTION of GRB 130310A afterglow detection
  83. Swift XRT observations of GRB 130310A
  84. GRB 130306A: Swift Detection of a Possible Afterglow
  85. GRB 130306A: Swift-BAT refined analysis
  86. IPN triangulation of GRB 130228A
  87. GRB 130305A BAT refined circular
  88. GRB 130305A: Further Swift-XRT Observations
  89. Konus-Wind observation of GRB 130306A
  90. GRB 130305A: Optical Observations
  91. GRB 130306A: Fermi GBM observation
  92. GRB 130306A: MASTER-Net pre-Swift alert observation
  93. GRB 130305A: Swift/UVOT Upper Limit
  94. GRB 130305A: RATIR Observations
  95. GRB 130306A: Swift detection of a burst
  96. GRB 130305A: P60 Observations
  97. GRB 100615A: HST host detection and X-shooter redshift
  98. GRB 130305A: Swift/XRT detection of the afterglow
  99. Konus-Wind observation of GRB 130305A
  100. GRB 130305A: Fermi GBM observation

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