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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"

32764 results found.

  1. GRB 091221: Fermi GBM Observation
  2. GRB 091117: Swift-XRT late time observations
  3. GRB 091221 Swift-BAT refined analysis
  4. GRB091221: Swift/UVOT refined analysis, correction.
  5. GRB 091221: Swift/UVOT refined analysis
  6. GRB 091221: Swift-XRT refined analysis
  7. GRB 091221, GROND observations
  8. GRB 091221: UVOT Confirmation of an Optical Afterglow
  9. GRB 091221: ROTSE-III Detection of Optical Counterpart
  10. Swift trigger 379449 (possible GRB) is not a burst
  11. GRB 091215: Faulkes Telescope North observations
  12. GRB 091208B: Xinglong TNT optical observation
  13. GRB 091208A: Suzaku WAM observation of the prompt emission
  14. GRB 091208A: GAO 150cm telescope Optical Observation
  15. Konus-Wind observation of GRB 091208A
  16. GRB 091208B: GAO 150cm telescope Optical Observation
  17. GRB091208A: Swift/UVOT refined analysis
  18. GRB 091208B: optical observations
  19. GRB 091208B: Keck HIRES redshift confirmation
  20. GRB 091208B: GROND observations
  21. GRB 091208A: Swift-XRT observations
  22. GRB091208B: NOT optical observations
  23. GRB 091208B: Swift-XRT refined analysis
  24. GRB091208B: Swift/UVOT refined analysis
  25. GRB 091208B: Fermi GBM observation
  26. GRB 091208B, Swift-BAT refined analysis
  27. GRB 091208A Swift-BAT refined analysis
  28. GRB 091208B: Gemini-North redshift
  29. GRB 091208B: Faulkes Telescope North and South Optical Afterglow
  30. GRB 091208A, RIMOTS optical upper limits
  31. GRB 091208B: MITSuME Akeno Optical Observation
  32. GRB 091208B: MITSuME Okayama Optical Observation
  33. GRB 091208B, RIMOTS optical upper limits
  34. GRB 091208B: BOOTES-3 optical afterglow
  35. GRB 091208: ROTSE-III Optical Limits
  36. Short X-ray Transient, RIMOTS optical upper limits
  37. A small revision to the GRB-naming convention
  38. GRB 091123: Suzaku WAM observation of the prompt emission
  39. GRB 091127: Skynet/PROMPT Observations of Possible Host Galaxy
  40. GRB 091127: GAO 150cm telescope Optical Observation
  41. GRB 091202: GTC & CAHA optical/nIR afterglow candidate
  42. GRB 091109A: GROND confirmation of redshift z = 3.5
  43. GRB091127: Continuing Swift/UVOT Observations
  44. GRB 091127, SMARTS optical/IR afterglow observations
  45. GRB091202: Swift-XRT refined analysis
  46. GRB 091202: Swift/UVOT Upper Limits
  47. GRB 091202: Liverpool Telescope observations
  48. GRB 091202: Optical and NIR observations
  49. GRB 091127: Zadko Telescope Observations
  50. GRB 091126A: Suzaku WAM observation of the prompt emission
  51. GRB 091202: Liverpool Telescope Observations
  52. GRB 091127: redshift confirmation with X-shooter
  53. GRB 091117: Chandra Observations
  54. GRB 091020: MASTER-Net optical polarization observations
  55. GRB 091127: Skynet/PROMPT Continued Observations of Fading
  56. Short X-ray Transient Detection by MAXI/GSC
  57. Konus-Wind observation of very long GRB 091123
  58. GRB 091130A: Xinglong TNT upper limit
  59. GRB 091127: Suzaku WAM observation of the prompt emission
  60. GRB 091130B: Swift-XRT team refined analysis
  61. GRB 091130B: Swift-BAT refined analysis
  62. GRB 091130B: Swift/UVOT Upper Limits
  63. GRB 091127: Skynet/PROMPT Observations of Fading
  64. GRB 091130B: MASTER observations
  65. GRB 091130B: SDSS galaxy at XRT location
  66. GRB 091130: MASTER observations
  67. GRB 091127: Radio observations
  68. Konus-Wind observation of GRB 091127
  69. GRB 091127: optical observations
  70. GRB 091127: LABOCA/APEX submm observations
  71. GRB 091127: Further NOT optical observations
  72. GRB 091127: Fermi GBM detection
  73. GRB 091127: MASTER early optical transient polarimetry
  74. GRB 091127: Gemini-N redshift
  75. GRB 091127: Swift-XRT afterglow detection and analysis
  76. GRB 091127: Swift/UVOT observations
  77. GRB 091127: CAHA 1.23m I-band observations
  78. GRB 091127: Swift-BAT refined analysis
  79. GRB 091127: NOT observations
  80. GRB 091127 : GROND observations
  81. GRB 091127: REM NIR afterglow detection
  82. GRB 091127: Swift/UVOT Detection of an Optical Afterglow
  83. GRB 091127: Liverpool Telescope afterglow candidate
  84. IPN Triangulation of GRB091120
  85. Konus-Wind observation of GRB 091120
  86. GRB 091117A: Suzaku WAM observation of the prompt emission
  87. GRB 091117: TNG optical observations
  88. GRB 091117A: Swift/UVOT followup observations
  89. GRB 091117: 2nd epoch of Magellan optical observations
  90. GRB 091117: VLA radio observations
  91. GRB 091117: Swift-XRT observations
  92. GRB 091117 BAT refined analysis
  93. GRB 091117: Evidence for Variability of XRT Source #1
  94. GRB091117: Gemini South Observations
  95. GRB 091117: Swift XRT refined analysis
  96. GRB 091117: Gemini-North spectroscopy of DSS galaxy
  97. Konus-Wind observations of GRB 091117A
  98. GRB 091117: Magellan optical observations
  99. GRB 091117: XRT source coincident with a DSS galaxy
  100. GRB 091112: Suzaku WAM observation of the prompt emission

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