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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"

5184 results found.

  1. GRB 140129B: Swift detection of a burst with an optical afterglow
  2. GRB 140129A: ROTSE-III Detection of Optical Counterpart
  3. Correction: MAXI J1421-613: Skynet PROMPT/R-COP observations
  4. GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
  5. GRB 140103A: MASTER-Net early OT detection
  6. GRB 140114A: MITSuME Okayama upper limits
  7. GRB 140114A: Swift-XRT refined Analysis
  8. GRB 140102A: AAO optical upper limits
  9. GRB 140105A: MASTER-Net early optical observations and time correction
  10. GRB 140108A: Swift-XRT refined Analysis
  11. GRB 140108A: Mondy optical observations
  12. GRB 140102A: Swift-XRT refined Analysis
  13. Konus-Wind observation of GRB 131229A
  14. GRB 131229A: Swift-BAT refined analysis
  15. GRB 131229A: Swift-XRT refined Analysis
  16. GRB 131229A: Swift detection of a burst
  17. GRB 131227A: Swift-XRT refined Analysis
  18. GRB 131224A: Swift-XRT observation
  19. GRB 131225A: MAXI/GSC detection
  20. GRB 131224A: MASTER-Net early optical observations
  21. GRB 131224A: A short GRB detected by INTEGRAL
  22. GRB 131216A: Fermi GBM observation
  23. GRB 131215A: MAXI/GSC detection
  24. INTEGRAL Weak trigger #6403: AROMA-N Optical Observation
  25. GRB 131205A: Swift-XRT refined Analysis
  26. GRB 131202A: Swift-XRT refined Analysis
  27. GRB 131125A: MASTER-Net very early optical observations
  28. IPN Triangulation of GRB 131125A (short/hard)
  29. GRB 131128A: Swift-XRT refined Analysis
  30. GRB 131128A: Swift detection of a burst
  31. GRB 131127A: Swift-XRT refined Analysis
  32. GRB 131127A: MASTER-NET optical observations
  33. GRB 131127A: Swift detection of a burst
  34. GRB 131118A: Fermi GBM detection
  35. GRB 131117A: Swift-XRT refined Analysis
  36. GRB 131108A: Swift-XRT observations
  37. IPN triangulation of GRB 131108A
  38. GRB 131105A: Swift-XRT refined Analysis
  39. GRB 131105A: VLT/X-shooter optical afterglow candidate
  40. GRB 131103A: Swift-XRT refined Analysis
  41. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  42. GRB 131030A: Swift-XRT refined Analysis
  43. GRB 131024B: Mondy optical upper limits
  44. GRB 131024B: Fermi GBM observation
  45. GRB 131024B: Swift-XRT refined Analysis
  46. Fermi GBM trigger 13121024.436 is not a GRB
  47. GRB 131024B: Nanshan optical upper limit
  48. GRB 131024A: Swift-XRT refined Analysis
  49. GRB 131024A: Skynet R-COP optical observations
  50. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  51. GRB 131018A: Swift-XRT refined Analysis
  52. GRB131018A, optical observations
  53. Fermi 403206457 / GRB 131011A: AAO optical observations
  54. GRB 131014A: Swift detection of a possible X-ray afterglow
  55. Swift-XRT detection of iPTF 13dsw/Fermi403206457
  56. Fermi403206457: NOT optical observations
  57. Fermi403206457: iPTF detection of a possible optical afterglow
  58. Trigger 574266 is not a Swift detection of a known source
  59. GRB 131004A: Swift-XRT refined Analysis
  60. GRB 131002B: Swift-XRT Refined Analysis
  61. GRB 131002A: Swift-XRT refined Analysis
  62. GRB 131001A detected in ground analysis of Swift-BAT data
  63. IPN Observations of GRB 130925A
  64. GRB 130929A: Swift-XRT refined Analysis
  65. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  66. GRB 130925A: Historical non-detection from Rosat-HRI
  67. GRB 130925A: Initial Similarities to Swift J1644+57
  68. GRB 130925A: Swift detection of a burst
  69. GRB 130919A: Swift detection of a burst
  70. GRB 130912A: WHT confirmation of optical counterpart
  71. GRB 130912A: Swift-XRT refined Analysis
  72. GRB 130831A: ISON-Kislovodsk optical observations
  73. Swift Trigger 569022: a possible GRB
  74. GRB 130831B: Swift-XRT refined Analysis
  75. GRB 130831A: Swift-XRT refined Analysis
  76. IPN triangulation of GRB130821A
  77. GRB 130821A: Weihai optical upper limit
  78. GRB 130822A: Swift-XRT refined Analysis
  79. GRB 130816A: Swift-XRT refined Analysis
  80. GRB 130816B: Swift-XRT refined Analysis
  81. IPN Triangulation of GRB 130812B (long/soft)
  82. GRB 130812A: Swift-XRT refined Analysis
  83. GRB 130812A: Swift detection of a burst
  84. GRB 130806A: Swift-XRT refined Analysis
  85. GRB 130803A: Swift-XRT refined Analysis
  86. GRB 130727A: Swift-XRT refined Analysis
  87. GRB 130725A: Swift-XRT refined Analysis
  88. GRB 130725B: Swift-XRT refined Analysis
  89. GRB 130725B: Swift detection of a burst
  90. Fermi Gamma-ray Burst Monitor trigger 396447899 / 130725517 is not a GRB
  91. GRB 130722A: Swift-XRT refined Analysis
  92. GRB 130702A: Continued P60 observations
  93. Fermi394416326: iPTF detection of a possible optical afterglow
  94. GRB 130701A: MITSuME Akeno Optical observation
  95. GRB 130701A: Swift-XRT refined Analysis
  96. GRB 130627A: Swift-XRT refined Analysis
  97. GRB 130625A: Swift-XRT refined Analysis
  98. GRB 130603B: First epoch of XMM-Newton observations
  99. Swift Trigger 558828 is not an interesting event
  100. GRB 130609B: Suzaku WAM observation of the prompt emission

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