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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"

19662 results found.

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

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