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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"

45759 results found.

  1. GRB100401A: GROND Upper Limits
  2. INTEGRAL Alert n. 5995: MASTER-Net optical observations
  3. MASTER observations on the Swift second trigger on LS V +44 17
  4. IBAS Alert n. 5996: not a GRB
  5. IBAS Alert n. 5995: not a GRB
  6. GRB 100331B: GROND Upper limits
  7. Master-Net observations on the Swift trigger on LS V +44 17
  8. GRB 100401A: Swift/UVOT Upper Limit
  9. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  10. GRB 100401A: Fermi GBM detection
  11. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  12. GRB 100331B: BOOTES-3 observations
  13. GRB 100316A: R-band limit
  14. GRB 100324B: Suzaku WAM observation of the prompt emission
  15. GRB 100331B: Swift/UVOT Upper Limits
  16. GRB 100331B: Swift/XRT possible afterglow candidate
  17. Swift detection of LS V +44 17
  18. GRB 100331B: SuperAGILE Localization of a Long GRB
  19. INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations
  20. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  21. GRB 100331A: BOOTES-3 observations
  22. Konus-Wind observation of GRB 100324B
  23. GRB 100331A: A long GRB detected by INTEGRAL
  24. IPN triangulation of GRB100324B
  25. Konus-Wind observation of GRB 100322A
  26. Short X-ray Transient detected by MAXI/GSC
  27. Fermi GBM detection of four Solar Flares
  28. GRB 100322A: Suzaku WAM observation of the prompt emission
  29. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  30. GRB 100325A: Fermi LAT detection
  31. GROND observations of GRB100316D/SN2010bh
  32. GRB 100325A: Fermi GBM detection
  33. GRB 100324A: GROND observations
  34. GRB 100324A found in ground analysis of BAT data
  35. Emerging Supernova in the Afterglow of GRB 100316D
  36. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  37. GRB 100316D: Spectroscopic Discovery of a Supernova from Magellan
  38. SGR 1833-0832: Swift/UVOT Upper Limits
  39. GRB 100322A: Fermi GBM detection
  40. SGR 1833-0832: Archival Chandra Observations
  41. SGR 1833-0832 is pulsed at 7.56 seconds
  42. SGR 1833-0832 is pulsed at 7.56 seconds
  43. Possible pulsation period in SGR 1833-0832
  44. Discovery of the Spin Period of SGR 1833-0832
  45. GRB 100316D: ATCA radio observations
  46. Probable SGR 1833-0832: Swift-XRT refined analysis
  47. Probable SGR 1833-0832: Enhanced Swift-XRT position
  48. Swift-XRT refined position of the probable new SGR 1833-0832
  49. Swift-BAT refined analysis of the probable new SGR 1833-0832
  50. GRB 100219A: MASTER-Net optical alert observations
  51. GRB 100319A: Swift detection of a burst; possible SGR
  52. GRB 100316D: Possible Supernova
  53. GRB 100316D: Pre-burst emission measured by BAT
  54. GRB 100316D: Further Gemini observations
  55. GRB 100219A: optical upper limit
  56. GRB 100316A: optical observations in CrAO
  57. GRB 100316D: Swift/UVOT Observations
  58. GRB 100316D: Swift XRT enhanced position and further refined analysis
  59. GRB 100316B: Swift-XRT refined analysis
  60. Tentative redshift of GRB100316D from X-ray data
  61. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  62. Trigger 416226 is probably not a GRB
  63. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  64. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  65. GRB 100316D: VLT/X-shooter observations
  66. GRB 100316D: Swift-BAT refined analysis
  67. GRB100316C: Swift/UVOT Upper Limits
  68. GRB 100316C: Swift-BAT refined analysis
  69. GRB 100316B: Swift/UVOT observations
  70. GRB 100316C: Swift-XRT team refined analysis
  71. GRB 100316C: Enhanced Swift-XRT position
  72. GRB 100316D: Swift XRT refined analysis
  73. GRB 100316A: TAROT Calern observatory optical observations
  74. GRB 100316A: Swift-XRT refined analysis
  75. GRB 100316B: Enhanced Swift-XRT position
  76. GRB 100316A: Swift-BAT refined analysis
  77. GRB 100316B: Swift-BAT refined analysis
  78. GRB100316A: Swift/UVOT Upper Limits
  79. Trigger 416140 is almost certainly not a GRB
  80. GRB 100316C: BOOTES-3 observations
  81. GRB 100316D: Swift detection of a burst
  82. GRB 100316B: VLT/X-shooter redshift
  83. GRB 100316B: Skynet/PROMPT Observations of Fading
  84. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  85. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  86. GRB 100316C: Swift detection of a burst
  87. GRB 100316A: Enhanced Swift-XRT position
  88. GRB 100316B: Swift detection of a burst with optical counterpart
  89. GRB 100316 optical candidate from 1.23m CAHA telescope
  90. GRB 100316 optical candidate from 1.23m CAHA telescope
  91. GRB 100316A: Swift/UVOT Observations
  92. GRB 100316A: Swift-XRT detection
  93. GRB 100316A: Swift detection of a burst
  94. IBAS Alert 5992 is not a GRB, but XTE J1855-026
  95. GRB100305A: Optical upper limits at IAO
  96. GRB 100305A: Super-LOTIS early observations
  97. GRB100302A : LOAO observations and Lulin afterglow analysis
  98. GRB 100305A, Swift-BAT refined analysis
  99. GRB 100305A: Gemini z'-band observation
  100. GRB 100305A: Swift/UVOT Upper Limits

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