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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

35958 results found.

  1. GRB 100401A Burst, possibly short, detected in ground analysis of BAT data
  2. GRB 100331B: BOOTES-3 observations
  3. GRB 100316A: R-band limit
  4. GRB 100324B: Suzaku WAM observation of the prompt emission
  5. GRB 100331B: Swift/UVOT Upper Limits
  6. GRB 100331B: Swift/XRT possible afterglow candidate
  7. GRB 100331B: SuperAGILE Localization of a Long GRB
  8. INTEGRAL trigger 5994 (GRB100331A): Swift/XRT observations
  9. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  10. GRB 100331A: BOOTES-3 observations
  11. Konus-Wind observation of GRB 100324B
  12. GRB 100331A: A long GRB detected by INTEGRAL
  13. IPN triangulation of GRB100324B
  14. Konus-Wind observation of GRB 100322A
  15. GRB 100322A: Suzaku WAM observation of the prompt emission
  16. GRB 100325A: Fermi LAT detection
  17. GROND observations of GRB100316D/SN2010bh
  18. GRB 100325A: Fermi GBM detection
  19. GRB 100324A: GROND observations
  20. GRB 100324A found in ground analysis of BAT data
  21. Emerging Supernova in the Afterglow of GRB 100316D
  22. GRB 100322B or possible Galactic transient detected in ground analysis of BAT data
  23. GRB 100316D: Spectroscopic Discovery of a Supernova from Magellan
  24. GRB 100322A: Fermi GBM detection
  25. GRB 100316D: ATCA radio observations
  26. GRB 100319A: correction to GCN 10527
  27. Probable SGR 1833-0832: Swift-XRT refined analysis
  28. GRB 100219A: MASTER-Net optical alert observations
  29. GRB 100319A: Swift detection of a burst; possible SGR
  30. GRB 100316D: Possible Supernova
  31. GRB 100316D: Pre-burst emission measured by BAT
  32. GRB 100316D: Further Gemini observations
  33. GRB 100219A: optical upper limit
  34. GRB 100316A: optical observations in CrAO
  35. GRB 100316D: Swift/UVOT Observations
  36. GRB 100316D: Swift XRT enhanced position and further refined analysis
  37. GRB 100316B: Swift-XRT refined analysis
  38. Tentative redshift of GRB100316D from X-ray data
  39. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  40. Trigger 416226 is probably not a GRB
  41. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  42. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  43. GRB 100316D: VLT/X-shooter observations
  44. GRB 100316D: Swift-BAT refined analysis
  45. GRB100316C: Swift/UVOT Upper Limits
  46. GRB 100316C: Swift-BAT refined analysis
  47. GRB 100316B: Swift/UVOT observations
  48. GRB 100316C: Swift-XRT team refined analysis
  49. GRB 100316C: Enhanced Swift-XRT position
  50. GRB 100316D: Swift XRT refined analysis
  51. GRB 100316A: TAROT Calern observatory optical observations
  52. GRB 100316A: Swift-XRT refined analysis
  53. GRB 100316B: Enhanced Swift-XRT position
  54. GRB 100316A: Swift-BAT refined analysis
  55. GRB 100316B: Swift-BAT refined analysis
  56. GRB100316A: Swift/UVOT Upper Limits
  57. Trigger 416140 is almost certainly not a GRB
  58. GRB 100316C: BOOTES-3 observations
  59. GRB 100316D: Swift detection of a burst
  60. GRB 100316B: VLT/X-shooter redshift
  61. GRB 100316B: Skynet/PROMPT Observations of Fading
  62. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  63. GRB 100316C: Swift detection of a burst
  64. GRB 100316A: Enhanced Swift-XRT position
  65. GRB 100316B: Swift detection of a burst with optical counterpart
  66. GRB 100316 optical candidate from 1.23m CAHA telescope
  67. GRB 100316 optical candidate from 1.23m CAHA telescope
  68. GRB 100316A: Swift/UVOT Observations
  69. GRB 100316A: Swift-XRT detection
  70. GRB 100316A: Swift detection of a burst
  71. IBAS Alert 5992 is not a GRB, but XTE J1855-026
  72. GRB100305A: Optical upper limits at IAO
  73. GRB 100305A: Super-LOTIS early observations
  74. GRB 100305A, Swift-BAT refined analysis
  75. GRB 100305A: Gemini z'-band observation
  76. GRB 100305A: Swift/UVOT Upper Limits
  77. GRB 100305A: Swift-XRT refined analysis
  78. GRB 100305A Optical Observations
  79. GRB 100305A: Enhanced Swift-XRT position
  80. GRB 100305A: Gemini-N OT candidate
  81. GRB 100305A: PAIRITEL NIR Upper Limits
  82. GRB 100305A: P60 Observations
  83. GRB 100305A: Swift detection of a burst
  84. GRB 100302A: Ondrejov 65cm limit
  85. GRB 100302A: Swift/UVOT Upper Limits
  86. GRB 100302A: Swift-XRT refined analysis
  87. GRB 100302A: Gemini-North redshift
  88. GRB 100302A: Gemini-N OT confirmation
  89. GRB 100302A: Optical observations at Crni Vrh
  90. GRB 100302A: MASTER-Net optical alert observations
  91. GRB 100302A, Swift-BAT refined analysis
  92. GRB 1000302A : A possible afterglow candidate
  93. GRB 100302A: Enhanced Swift-XRT position
  94. GRB 100302A: Skynet/DAO Observations
  95. GRB 100302A: Swift detection of a burst
  96. GRB 100224B: Fermi GBM detection
  97. GRB 100206A: optical observations in CrAO
  98. GRB 100206A: optical observations in Terskol
  99. GRB 100213B: Mondy optical observations
  100. GRB 100219A: optical observations

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