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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"

27039 results found.

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

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