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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"

11609 results found.

  1. GRB 140206A: Fermi GBM detection
  2. GRB 140206B: Fermi-LAT detection
  3. GRB 140206B: Fermi GBM detection
  4. GRB 140122A/Fermi412093190: MASTER-Net early optical observations
  5. Fermi412093190: iPTF optical counterpart search
  6. GRB 140118A: Fermi GBM observation
  7. GRB 140110A: Further Swift-XRT Observation
  8. GRB 140104B: Further Swift XRT observations
  9. Fermi Gamma-ray Burst Monitor trigger 411362827 is not a GRB
  10. IPN Triangulation of GRB 140110A
  11. GRB 140110A: Swift/UVOT Observations
  12. GRB 140104B: Suzaku WAM observation of the prompt emission
  13. GRB 140110A: Swift XRT observations
  14. GRB 140110A: Fermi GBM observation
  15. GRB 140110A Tiled Swift observations
  16. GRB 140110A: Fermi-LAT detection of a burst
  17. GRB 140105A: MASTER-Net early optical observations and time correction
  18. GRB 131231A: AAO optical observations
  19. GRB 140108A: Fermi GBM detection
  20. New Fermi-LAT GRB Table
  21. GRB 140105A: HCT Observations
  22. GRB 140105A: continued iPTF observations and rejection of optical candidates
  23. GRB 140105A: Swift XRT observations
  24. GRB 140104B: Swift XRT observations
  25. GRB 140105A: Fermi GBM detection
  26. GRB 140104B: Fermi GBM observation
  27. Fermi410578384: iPTF optical afterglow candidates for a possible short GRB
  28. GRB 140102A: BOOTES-4 early optical observations
  29. GRB 140104B: Fermi-LAT detection of a burst
  30. GRB 131209A: Further Swift XRT observations
  31. GRB 131231A, Optical Observations
  32. GRB 140102A: P60 observations
  33. GRB 131231A: Swift/UVOT Observations of the Optical Afterglow
  34. GRB 131231A: Fermi GBM correction to GCN 15644
  35. Konus-Wind observation of GRB 131231A
  36. GRB 140102A: Fermi/GBM Observation
  37. Konus-Wind observation of GRB 140102A
  38. GRB 140102A: Fermi-LAT detection of a burst
  39. GRB 131229A: Fermi GBM detection
  40. GRB 131231A: Swift-XRT observations
  41. GRB 131231A: VLT/X-shooter redshift
  42. GRB 131231A: Fermi GBM detection
  43. GRB 131231A: iPTF optical afterglow candidate coincident with Nanshan detection
  44. GRB 131231A: afterglow confirmation from the NOT
  45. GRB 131231A: Nanshan afterglow candidate
  46. GRB 131231A: Fermi-LAT detection of a burst
  47. GRB 131216A: Suzaku WAM observation of the prompt emission
  48. Fermi Gamma-ray Burst Monitor trigger 409187680/131219968 is not a GRB
  49. IPN Triangulation of GRB 131216A
  50. GRB 131216A: Fermi GBM observation
  51. GRB 131216A: Fermi-LAT detection of a burst
  52. GRB 131209A: Swift XRT and UVOT observations
  53. GRB 131209A: Fermi GBM observation
  54. GRB 131209A Tiled Swift observations
  55. Konus-Wind observation of GRB 131209A
  56. IPN Triangulation of GRB 131209A
  57. GRB 131209A: Fermi-LAT detection of a burst
  58. GRB 131127B: archival confirmation of iPTF13ecv as a CV
  59. GRB 131127B: rejection of optical counterpart candidates
  60. GRB 131126A: Fermi GBM observation
  61. GRB 131126A: iPTF upper limits on the afterglow of a short GRB
  62. GRB 131202A: Fermi GBM Detection
  63. GRB 131128A; Fermi GBM observation
  64. GRB 131125A: MASTER-Net very early optical observations
  65. GRB 131125A: iPTF upper limits on the afterglow of a short GRB
  66. IPN Triangulation of GRB 131126A (short/hard)
  67. IPN Triangulation of GRB 131125A (short/hard)
  68. GRB 131127B: Bassano Bresciano Observatory optical observations
  69. GRB 131127B: Nanshan optical observations
  70. Konus-Wind observation of GRB 131127B
  71. IPN Triangulation of GRB 131127B
  72. GRB 131127B: Fermi GBM detection
  73. Fermi407254341: iPTF optical afterglow candidates
  74. Konus-Wind observation of GRB 131118A
  75. IPN Triangulation of GRB 131118A
  76. Fermi Gamma-ray Burst Monitor trigger 406601061 / 131120031 is not a GRB
  77. GRB 131118A: Fermi GBM detection
  78. GRB 131108A: VLA Observations
  79. Fermi GBM trigger 406351590 / 131117143 is not a GRB
  80. Konus-Wind observation of GRB 131108A
  81. GRB 131108A: CARMA 3mm detection
  82. GRB 131108A: Fermi GBM observation
  83. GRB 131108A: Swift/UVOT Detection
  84. GRB 131108A: Swift-XRT observations
  85. GRB 131108A: TAROT-Calern optical observation
  86. GRB 131108A: Fermi-LAT refined analysis
  87. GRB 131108A: NOT optical observations
  88. GRB 131108A: Redshift from 10.4m GTC
  89. GRB 131108A: Swift detection of a possible X-ray afterglow
  90. GRB 131108A Tiled Swift observations
  91. GRB 131108A: Fermi-LAT onboard detection of a burst
  92. GRB 131029A: Suzaku WAM observation of the prompt emission
  93. GRB 131105A: Fermi GBM observation
  94. GRB 131018B: RATIR Optical/NIR Observations
  95. GRB 131031A: Fermi GBM detection
  96. GRB 131018B: Further Swift-XRT observations.
  97. GRB 131031A: MASTER optical observation
  98. GRB 131031A found in ground analysis of BAT data
  99. GRB 131024C: ICSP discovery of a burst in X-rays by balloon borne study
  100. GRB 131029A: Nanshan optical observations

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