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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"

27594 results found.

  1. Swift Trigger 420256: ROTSE-III Optical Limits
  2. Trigger 420256: Swift detection of a possible GRB
  3. GRB 100423A: Skynet/PROMPT Detections
  4. GRB 100423A: GROND discovery of afterglow
  5. GRB 100423A: Swift detection of a burst
  6. GRB 100418A: Continued PAIRITEL NIR Observations
  7. GRB 100414A: CFHT optical observations
  8. GRB 100420A: Swift/UVOT Upper Limits
  9. GRB 100420A: XRT refined analysis
  10. GRB 100418A: SARA second epoch
  11. GRB 100420A: SARA Upper Limits
  12. GRB 100418A: MASTER-Net optical observations
  13. GRB 100414A: Confirmation of the X-ray afterglow
  14. GRB 100420A: ROTSE-III Optical Limits
  15. GRB 100420A: Swift detection of a burst
  16. GRB 100418A PAIRITEL NIR Observations
  17. GRB 100418A: Swift/UVOT Observations
  18. GRB 100418A: Swift-XRT Refined Analysis
  19. GRB 100418A: SARA observations
  20. GRB 100418A: Swift-BAT refined analysis
  21. GRB 100418A: ROTSE-III Optical Limits
  22. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  23. GRB 100413A: Radio Afterglow Detection with the EVLA
  24. GRB 100414A: Suzaku WAM observation of the prompt emission
  25. GRB 100414A: Swift/UVOT Observations
  26. GRB 100414A: GROND Detection of the Optical Afterglow
  27. GRB 100413A: Suzaku WAM observation of the prompt emission
  28. GRB 100414A: Palomar Transient Factory Observations
  29. GRB 100413B: Swift Confirmation of Burst
  30. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  31. GRB 100413A: Swift-BAT final refined analysis
  32. GRB 100414A: Fermi GBM detection
  33. GRB100414A: Fermi LAT detection
  34. GRB 100413B : Swift detection of a burst
  35. GRB 100413A: GROND Upper limits
  36. GRB 100413A: Swift/UVOT Upper Limits
  37. Konus-Wind observation of GRB 100413A
  38. GRB 100413A: Faulkes Telescope South observations
  39. GRB 100413A: SARA upper limit
  40. GRB 100413A: Swift-XRT Refined Analysis
  41. GRB 100413A: Swift-BAT initial refined analysis
  42. GRB 100413A: MASTER-Net optical observations
  43. GRB 100413A: Swift detection of a burst
  44. Swift-BAT trigger 419015 is not astrophysical
  45. Trigger 419015 is probably not a GRB
  46. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  47. MASTER observations on the Swift second trigger on LS V +44 17
  48. IBAS Alert n. 5996: not a GRB
  49. IBAS Alert n. 5995: not a GRB
  50. GRB 100331B: GROND Upper limits
  51. Master-Net observations on the Swift trigger on LS V +44 17
  52. GRB 100401A: Swift/UVOT Upper Limit
  53. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  54. GRB 100401A: Fermi GBM detection
  55. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  56. GRB 100316A: R-band limit
  57. GRB 100331B: Swift/XRT possible afterglow candidate
  58. Swift detection of LS V +44 17
  59. INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations
  60. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  61. Konus-Wind observation of GRB 100322A
  62. Fermi GBM detection of four Solar Flares
  63. GRB 100322A: Suzaku WAM observation of the prompt emission
  64. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  65. GRB 100325A: Fermi LAT detection
  66. GROND observations of GRB100316D/SN2010bh
  67. GRB 100325A: Fermi GBM detection
  68. GRB 100324A: GROND observations
  69. GRB 100324A found in ground analysis of BAT data
  70. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  71. GRB 100316D: Spectroscopic Discovery of a Supernova from Magellan
  72. SGR 1833-0832: Swift/UVOT Upper Limits
  73. GRB 100322A: Fermi GBM detection
  74. Probable SGR 1833-0832: Swift-XRT refined analysis
  75. Swift-XRT refined position of the probable new SGR 1833-0832
  76. Swift-BAT refined analysis of the probable new SGR 1833-0832
  77. GRB 100219A: MASTER-Net optical alert observations
  78. GRB 100319A: Swift detection of a burst; possible SGR
  79. GRB 100316D: Pre-burst emission measured by BAT
  80. GRB 100316D: Swift/UVOT Observations
  81. GRB 100316D: Swift XRT enhanced position and further refined analysis
  82. GRB 100316B: Swift-XRT refined analysis
  83. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  84. Trigger 416226 is probably not a GRB
  85. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  86. GRB 100316D: Swift-BAT refined analysis
  87. GRB100316C: Swift/UVOT Upper Limits
  88. GRB 100316C: Swift-BAT refined analysis
  89. GRB 100316B: Swift/UVOT observations
  90. GRB 100316C: Swift-XRT team refined analysis
  91. GRB 100316D: Swift XRT refined analysis
  92. GRB 100316A: TAROT Calern observatory optical observations
  93. GRB 100316A: Swift-XRT refined analysis
  94. GRB 100316A: Swift-BAT refined analysis
  95. GRB 100316B: Swift-BAT refined analysis
  96. GRB100316A: Swift/UVOT Upper Limits
  97. Trigger 416140 is almost certainly not a GRB
  98. GRB 100316D: Swift detection of a burst
  99. GRB 100316B: Skynet/PROMPT Observations of Fading
  100. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate

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