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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"

38622 results found.

  1. Swift Trigger 381434 is not a GRB
  2. Trigger 381434: Swift detection of a possible burst
  3. GRB 091221 : IRSF NIR upper limit
  4. GRB 091221: Fermi GBM Observation
  5. GRB 091117: Swift-XRT late time observations
  6. GRB 091221: Swift/UVOT refined analysis
  7. GRB 091221: Swift-XRT refined analysis
  8. GRB 091221: Enhanced Swift-XRT position
  9. GRB 091221, GROND observations
  10. GRB 091221: UVOT Confirmation of an Optical Afterglow
  11. GRB 091221: ROTSE-III Detection of Optical Counterpart
  12. GRB 091221: Swift detection of a burst
  13. Swift trigger 379449 (possible GRB) is not a burst
  14. GRB 091215: Faulkes Telescope North observations
  15. Trigger 379449: Swift detection of a possible burst
  16. GRB 091208B: Xinglong TNT optical observation
  17. GRB 091208A: Suzaku WAM observation of the prompt emission
  18. GRB 091208A: GAO 150cm telescope Optical Observation
  19. Konus-Wind observation of GRB 091208A
  20. GRB 091208B: GAO 150cm telescope Optical Observation
  21. GRB091208A: Swift/UVOT refined analysis
  22. GRB 091208B: optical observations
  23. GRB 091208B: Keck HIRES redshift confirmation
  24. GRB 091208B: GROND observations
  25. GRB 091208A: Swift-XRT observations
  26. GRB091208B: NOT optical observations
  27. GRB 091208B: Swift-XRT refined analysis
  28. GRB091208B: Swift/UVOT refined analysis
  29. GRB 091208B: Fermi GBM observation
  30. GRB 091208A Swift-BAT refined analysis
  31. GRB 091208B: Gemini-North redshift
  32. GRB 091208B: Faulkes Telescope North and South Optical Afterglow
  33. GRB 091208A, RIMOTS optical upper limits
  34. GRB 091208B: MITSuME Akeno Optical Observation
  35. GRB 091208B: Enhanced Swift-XRT position
  36. GRB 091208B: MITSuME Okayama Optical Observation
  37. GRB 091208B, RIMOTS optical upper limits
  38. GRB 091208B: Swift detection of a burst with an optical afterglow
  39. GRB 091208B: BOOTES-3 optical afterglow
  40. GRB 091208: ROTSE-III Optical Limits
  41. GRB 091208: Swift detection of a burst
  42. Short X-ray Transient, RIMOTS optical upper limits
  43. A small revision to the GRB-naming convention
  44. GRB 091123: Suzaku WAM observation of the prompt emission
  45. GRB 091127: GAO 150cm telescope Optical Observation
  46. GRB 091202: GTC & CAHA optical/nIR afterglow candidate
  47. GRB 091109A: GROND confirmation of redshift z = 3.5
  48. GRB091127: Continuing Swift/UVOT Observations
  49. GRB 091127, SMARTS optical/IR afterglow observations
  50. GRB091202: Swift-XRT refined analysis
  51. GRB 091202: Swift/UVOT Upper Limits
  52. GRB 091202: Liverpool Telescope observations
  53. GRB 091202: Optical and NIR observations
  54. GRB 091202 - UVOT-enhanced XRT position
  55. GRB 091127: Zadko Telescope Observations
  56. GRB 091126A: Suzaku WAM observation of the prompt emission
  57. GRB 091202: Liverpool Telescope Observations
  58. GRB 091202: a long GRB detected by INTEGRAL
  59. GRB 091127: redshift confirmation with X-shooter
  60. GRB 091117: Chandra Observations
  61. GRB 091020: MASTER-Net optical polarization observations
  62. Short X-ray Transient Detection by MAXI/GSC
  63. Konus-Wind observation of very long GRB 091123
  64. GRB 091130A: Xinglong TNT upper limit
  65. GRB 091123: Fermi GBM detection of a very long burst
  66. GRB 091126B: Fermi GBM detection
  67. GRB 091127: Suzaku WAM observation of the prompt emission
  68. GRB 091126: Fermi GBM detection
  69. GRB 091130B: Swift-XRT team refined analysis
  70. GRB 091130B: Swift/UVOT Upper Limits
  71. GRB 091130B: Enhanced Swift-XRT position
  72. Swift trigger 377436 (possible GRB 091130A) is not a burst
  73. GRB 091130B: Swift detection of a burst
  74. GRB 091130: Swift detection of a possible burst
  75. GRB 091127: Radio observations
  76. GRB 091128: Fermi GBM detection
  77. Konus-Wind observation of GRB 091127
  78. GRB 091127: optical observations
  79. GRB 091127: LABOCA/APEX submm observations
  80. GRB 091127: Further NOT optical observations
  81. GRB 091127: Fermi GBM detection
  82. GRB 091127: Gemini-N redshift
  83. GRB 091127: Swift-XRT afterglow detection and analysis
  84. GRB 091127: Swift/UVOT observations
  85. GRB 091127: CAHA 1.23m I-band observations
  86. GRB 091127: NOT observations
  87. GRB 091127 : GROND observations
  88. GRB 091127: REM NIR afterglow detection
  89. GRB 091127: Swift/UVOT Detection of an Optical Afterglow
  90. GRB 091127: Liverpool Telescope afterglow candidate
  91. GRB 091127: Swift detection of a burst
  92. IPN Triangulation of GRB091120
  93. Konus-Wind observation of GRB 091120
  94. GRB 091120: MAXI GSC detection
  95. GRB 091120: Fermi GBM observation
  96. GRB 091117A: Suzaku WAM observation of the prompt emission
  97. GRB 091117: TNG optical observations
  98. GRB 091117A: Swift/UVOT followup observations
  99. GRB 091117: 2nd epoch of Magellan optical observations
  100. GRB 091117: VLA radio observations

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