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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27037 results found.

  1. GRB 130427A: Zadko observatory - Gingin optical observations
  2. GRB 130427A: MAXI/GSC detection
  3. GRB 130427B: Faulkes Telescope North afterglow detection
  4. GRB 130427B: Swift detection of a burst with optical counterpart
  5. GRB 130427A: RATIR Optical and NIR Observations
  6. GRB 130427A: Weihai optical observations
  7. GRB 130427A: MITSuME Akeno Optical observation(T0+8000s~)
  8. GRB 130427A: PAIRITEL NIR Detections
  9. GRB 130427A: Faulkes Telescope North detection
  10. GRB 130427A: P60 early nondetection
  11. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  12. GRB 130420A: Continued Skynet/GORT Observations/Detections
  13. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  14. GRB 130425A: Fermi GBM detection
  15. GRB 130420A: Continued RATIR Optical and NIR Observations
  16. GRB 130420A: ROTSE-III data analysis
  17. GRB 130420A: Continued RATIR Optical and NIR Observations
  18. GRB 130418A: Continued RATIR Optical and NIR Observations
  19. GRB 130420A: Early RAPTOR Simultaneous Multi-Color Observations
  20. GRB 130420B: Fermi GBM observation
  21. Swift Trigger 554135 is probably not a GRB or transient
  22. GRB 130420B: RATIR Optical and NIR Observations
  23. GRB 130420A: Continued RATIR Optical and NIR Observations
  24. GRB 130420B: Swift-XRT refined Analysis
  25. GRB 130420A: Fermi GBM observation
  26. GRB 130420A: ISON-NM optical observations
  27. Skynet/GORT observations of GRB130420A
  28. GRB 130420B: Weihai optical upper limit
  29. GRB 130420B: Swift/UVOT Upper Limits
  30. GRB 130420A: Swift/UVOT Detection
  31. GRB 130420A: Swift-XRT refined Analysis
  32. GRB 130420B, Swift-BAT refined analysis
  33. GRB 130420A, Swift-BAT refined analysis
  34. Konus-Wind observation of GRB 130418A
  35. GRB130420A : Xinglong TNT optical upper limit
  36. GRB 130420B: Faulkes Telescope North observations
  37. GRB 130420A: Weihai Optical Observations
  38. GRB 130420B: Swift detection of a burst
  39. GRB 130420A: RATIR Optical and NIR Observations
  40. GRB 130420A: PAIRITEL NIR detections
  41. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  42. GRB 130420A: Swift detection of a burst with an optical counterpart
  43. GRB 130420A: Faulkes Telescope North candidate
  44. GRB 130418A: Continued RATIR Optical and NIR Observations
  45. GRB 130418A: Swift-XRT refined Analysis
  46. Swift Trigger 553930 is not an astrophysical source
  47. GRB 130419A, Swift-BAT refined analysis
  48. GRB 130419B (Swift trigger Trigger 553930): MASTER-Net optical observations
  49. Trigger 553930: Swift detection of a possible flare from HR 5110
  50. GRB 130418A, Swift-BAT refined analysis
  51. GRB 130419A: Swift detection of a burst
  52. GRB 130418A: RATIR Optical and NIR Observations
  53. GRB 130418A: GROND detection of the optical-NIR afterglow
  54. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  55. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  56. GRB 130418A: Bassano Bresciano Observatory optical observations
  57. GRB 130418A: Swift detection of a burst with an optical counterpart
  58. GRB 130408A: Suzaku WAM observation of the prompt emission
  59. GRB 130408a: Skynet Optical Observations
  60. GRB 130408A, Swift-BAT refined analysis
  61. GRB 130408A: Zadko observatory - Gingin optical observations
  62. GRB130408A: Swift/UVOT followup observations
  63. GRB 130408A: Swift-XRT refined Analysis
  64. Konus-Wind observation of GRB 130408A
  65. GRB 130408A - Gemini-S/GMOS redshift determination
  66. GRB 130408A - VLT/X-shooter redshift determination
  67. GRB 130408A: GROND detection of the afterglow
  68. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow
  69. GRB 130408A: Liverpool Telescope Optical candidate detection
  70. GRB 130408A: Swift detection of a burst
  71. GRB 130211A: Retraction of afterglow candidate
  72. GRB 130327B: Suzaku WAM observation of the prompt emission
  73. Swift detection of IGR J18245-2452
  74. IPN Triangulation of GRB 130320B (very long/bright)
  75. Swift/XRT observation of GRB 130327B
  76. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  77. GRB 130310A: RATIR Observations
  78. Swift Trigger 552142 is a noise event
  79. GRB 130327B: Fermi-LAT detection of a burst
  80. GRB 130327B: Fermi GBM detection
  81. Swift Trigger 552142: a possible GRB
  82. GRB 130327A: Swift-BAT refined analysis
  83. GRB 130327A: Swift-XRT refined Analysis
  84. GRB 130327A: Swift/UVOT Upper Limits
  85. GRB 130327A: RATIR Optical and NIR Observations
  86. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  87. GRB 130325A: Fermi LAT detection
  88. GRB 130327A: Swift detection of a burst
  89. report: GRB 130315A: Zadko observatory - Gingin optical observations
  90. GRB 130325A: Fermi GBM detection
  91. GRB 130315A: GROND afterglow candidate
  92. GRB 130315A: Swift/UVOT Upper Limits
  93. GRB 130315A: SALT optical observations
  94. GRB 130315A: Swift-XRT refined Analysis
  95. GRB 130315A, Swift-BAT refined analysis
  96. GRB 130313A: Swift/UVOT Upper Limits
  97. GRB 130305A: PTF P48 optical upper limits
  98. GRB 130315A: Swift detection of a burst
  99. GRB 130310A : Suzaku WAM observation of the prompt emission
  100. GRB 130313A: RATIR Optical and NIR Observations

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