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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"

18496 results found.

  1. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  2. GRB 100414A: Palomar Transient Factory Observations
  3. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  4. GRB100414A: Fermi LAT detection
  5. GRB 100413A: GROND Upper limits
  6. GRB 100413A: Swift/UVOT Upper Limits
  7. GRB 100413A: SARA upper limit
  8. GRB 100413A: Swift-XRT Refined Analysis
  9. GRB 100413A: Enhanced Swift-XRT position
  10. GRB 100413A: Swift detection of a burst
  11. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  12. Trigger 419015 is probably not a GRB
  13. GRB100401A: GROND Upper Limits
  14. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  15. GRB 100331B: GROND Upper limits
  16. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  17. GRB 100331B: BOOTES-3 observations
  18. GRB 100331B: Swift/UVOT Upper Limits
  19. GRB 100331B: Swift/XRT possible afterglow candidate
  20. Swift detection of LS V +44 17
  21. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  22. GRB 100331A: BOOTES-3 observations
  23. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  24. GRB 100325A: Fermi LAT detection
  25. GROND observations of GRB100316D/SN2010bh
  26. GRB 100325A: Fermi GBM detection
  27. GRB 100324A: GROND observations
  28. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  29. SGR 1833-0832: Swift/UVOT Upper Limits
  30. SGR 1833-0832: Archival Chandra Observations
  31. Discovery of the Spin Period of SGR 1833-0832
  32. GRB 100316D: ATCA radio observations
  33. Probable SGR 1833-0832: Swift-XRT refined analysis
  34. Probable SGR 1833-0832: Enhanced Swift-XRT position
  35. GRB 100219A: MASTER-Net optical alert observations
  36. GRB 100319A: Swift detection of a burst; possible SGR
  37. GRB 100316D: Possible Supernova
  38. GRB 100219A: optical upper limit
  39. GRB 100316A: optical observations in CrAO
  40. GRB 100316D: Swift/UVOT Observations
  41. GRB 100316D: Swift XRT enhanced position and further refined analysis
  42. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  43. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  44. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  45. GRB 100316D: VLT/X-shooter observations
  46. GRB100316C: Swift/UVOT Upper Limits
  47. GRB 100316B: Swift/UVOT observations
  48. GRB 100316C: Enhanced Swift-XRT position
  49. GRB 100316D: Swift XRT refined analysis
  50. GRB 100316A: TAROT Calern observatory optical observations
  51. GRB 100316B: Enhanced Swift-XRT position
  52. GRB100316A: Swift/UVOT Upper Limits
  53. Trigger 416140 is almost certainly not a GRB
  54. GRB 100316C: BOOTES-3 observations
  55. GRB 100316D: Swift detection of a burst
  56. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  57. GRB 100316C: Swift detection of a burst
  58. GRB 100316A: Enhanced Swift-XRT position
  59. GRB 100316B: Swift detection of a burst with optical counterpart
  60. GRB100305A: Optical upper limits at IAO
  61. GRB 100305A: Super-LOTIS early observations
  62. GRB 100305A: Swift/UVOT Upper Limits
  63. GRB 100305A Optical Observations
  64. GRB 100305A: Enhanced Swift-XRT position
  65. GRB 100305A: Gemini-N OT candidate
  66. GRB 100305A: PAIRITEL NIR Upper Limits
  67. GRB 100305A: P60 Observations
  68. GRB 100305A: Swift detection of a burst
  69. GRB 100302A: Swift/UVOT Upper Limits
  70. GRB 100302A: Gemini-N OT confirmation
  71. GRB 100302A: Optical observations at Crni Vrh
  72. GRB 100302A: MASTER-Net optical alert observations
  73. GRB 1000302A : A possible afterglow candidate
  74. GRB 100302A: Enhanced Swift-XRT position
  75. GRB 100302A: Swift detection of a burst
  76. GRB 100206A: optical observations in CrAO
  77. GRB 100206A: optical observations in Terskol
  78. GRB 100213B: Mondy optical observations
  79. GRB 100219A: optical observations
  80. GRB 100225A: Fermi LAT detection
  81. GRB
  82. GRB100219A Akeno and Okayama MITSuME Optical Observation
  83. GRB 100219A: GROND observations
  84. GRB 100219A: NOT OA observations
  85. GRB 100219A: Enhanced Swift-XRT position
  86. GRB 100219A: Swift/UVOT Detection of the Optical Afterglow
  87. GRB 100219A: Pre-explosion imaging and host candidate
  88. GRB 100219A: Swift/UVOT Detection of a Source near the XRT Position
  89. GRB 100219A: Swift detection of a burst
  90. GRB 100216A: Keck imaging
  91. GRB 100213B: GRT Optical Observation
  92. GRB 100213A: GRT Optical Observation
  93. GRB 100213B: Enhanced Swift-XRT position
  94. GRB 100213B: Gemini-N Observations
  95. GRB 100213B: Swift/UVOT Upper Limits
  96. GRB 100213A: Swift/UVOT Upper Limits
  97. GRB 100213B: PAIRITEL NIR Upper Limits
  98. GRB 100213A: Enhanced Swift-XRT position
  99. GRB 100213A: SARA observations
  100. GRB 100213B: NOT optical observations

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