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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"

21801 results found.

  1. GRB100420A: MITSuME optical upper limits
  2. GRB 100414A: CFHT optical observations
  3. GRB 100420A: Swift/UVOT Upper Limits
  4. GRB 100420A: Enhanced Swift-XRT position
  5. GRB 100418A: SARA second epoch
  6. GRB 100420A: SARA Upper Limits
  7. GRB 100418A: optical observations
  8. GRB 100418A: SMA submm detection
  9. GRB 100420A: ROTSE-III Optical Limits
  10. GRB 100420A: Swift detection of a burst
  11. GRB 100418A: Swift/UVOT Observations
  12. GRB 100418A: Gemini-N redshift confirmation
  13. GRB100418A: VLT/X-shooter redshift and photometry
  14. GRB 100418A: SARA observations
  15. GRB 100418A: GROND observations; missing author list added
  16. GRB 100418A: GROND observations
  17. GRB 100418A: Enhanced Swift-XRT position
  18. GRB 100418A: ROTSE-III Optical Limits
  19. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  20. GRB 100414A: Suzaku WAM observation of the prompt emission
  21. GRB 100414A: Swift/UVOT Observations
  22. GRB 100414A: GROND Detection of the Optical Afterglow
  23. GRB 100414A: Gemini-N candidate and redshift
  24. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  25. GRB 100413A: Suzaku WAM observation of the prompt emission
  26. GRB 100414A: Palomar Transient Factory Observations
  27. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  28. Konus-Wind observation of GRB 100414B
  29. GRB 100414A: Fermi GBM detection
  30. GRB100414A: Fermi LAT detection
  31. GRB 100413B : Swift detection of a burst
  32. GRB 100413A: GROND Upper limits
  33. GRB 100413A: Swift/UVOT Upper Limits
  34. Konus-Wind observation of GRB 100413A
  35. GRB 100413A: SARA upper limit
  36. GRB 100413A: Enhanced Swift-XRT position
  37. GRB 100413A: Swift detection of a burst
  38. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  39. Trigger 419015 is probably not a GRB
  40. GRB100401A: GROND Upper Limits
  41. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  42. GRB 100331B: GROND Upper limits
  43. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  44. GRB 100331B: BOOTES-3 observations
  45. GRB 100324B: Suzaku WAM observation of the prompt emission
  46. GRB 100331B: Swift/UVOT Upper Limits
  47. GRB 100331B: Swift/XRT possible afterglow candidate
  48. Swift detection of LS V +44 17
  49. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  50. GRB 100331A: BOOTES-3 observations
  51. Konus-Wind observation of GRB 100324B
  52. Konus-Wind observation of GRB 100322A
  53. GRB 100322A: Suzaku WAM observation of the prompt emission
  54. GRB 100325A: Fermi LAT detection
  55. GROND observations of GRB100316D/SN2010bh
  56. GRB 100324A: GROND observations
  57. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  58. SGR 1833-0832: Swift/UVOT Upper Limits
  59. GRB 100322A: Fermi GBM detection
  60. SGR 1833-0832: Archival Chandra Observations
  61. Possible pulsation period in SGR 1833-0832
  62. Discovery of the Spin Period of SGR 1833-0832
  63. GRB 100316D: ATCA radio observations
  64. Probable SGR 1833-0832: Enhanced Swift-XRT position
  65. GRB 100219A: MASTER-Net optical alert observations
  66. GRB 100319A: Swift detection of a burst; possible SGR
  67. GRB 100316D: Possible Supernova
  68. GRB 100219A: optical upper limit
  69. GRB 100316A: optical observations in CrAO
  70. GRB 100316D: Swift/UVOT Observations
  71. GRB 100316D: Swift XRT enhanced position and further refined analysis
  72. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  73. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  74. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  75. GRB 100316D: VLT/X-shooter observations
  76. GRB 100316D: Swift-BAT refined analysis
  77. GRB100316C: Swift/UVOT Upper Limits
  78. GRB 100316B: Swift/UVOT observations
  79. GRB 100316C: Enhanced Swift-XRT position
  80. GRB 100316A: TAROT Calern observatory optical observations
  81. GRB 100316B: Enhanced Swift-XRT position
  82. GRB100316A: Swift/UVOT Upper Limits
  83. Trigger 416140 is almost certainly not a GRB
  84. GRB 100316C: BOOTES-3 observations
  85. GRB 100316D: Swift detection of a burst
  86. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  87. GRB 100316C: Swift detection of a burst
  88. GRB 100316A: Enhanced Swift-XRT position
  89. GRB 100316B: Swift detection of a burst with optical counterpart
  90. GRB100305A: Optical upper limits at IAO
  91. GRB 100305A: Super-LOTIS early observations
  92. GRB100302A : LOAO observations and Lulin afterglow analysis
  93. GRB 100305A: Swift/UVOT Upper Limits
  94. GRB 100305A Optical Observations
  95. GRB 100305A: Enhanced Swift-XRT position
  96. GRB 100305A: Gemini-N OT candidate
  97. GRB 100305A: PAIRITEL NIR Upper Limits
  98. GRB 100305A: P60 Observations
  99. GRB 100305A: Swift detection of a burst
  100. GRB 100302A: Swift/UVOT Upper Limits

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