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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"

19664 results found.

  1. GRB 090904B: Fermi GBM detection
  2. GRB 090904A: Swift-XRT refined analysis
  3. GRB 090904B: Swift XRT Refined Analysis
  4. GRB 090904B: MOA-II Optical observation
  5. GRB 090904A: Enhanced Swift XRT position
  6. GRB 090904B: Swift-BAT refined analysis
  7. GRB 090904A: Swift-BAT refined analysis
  8. GRB 090904B: Enhanced Swift-XRT position
  9. GRB090904A: Correction to enhanced XRT position
  10. GRB 090904A: Enhanced Swift-XRT position
  11. GRB090904B: REM observations
  12. GRB 090904B: Swift detection of a burst
  13. GRB 090904A: ROTSE-III Optical Limits
  14. GRB 090904: Swift detection of a burst
  15. GRB 090902B: Swift/UVOT refined analysis
  16. GRB090902B: Swift XRT refined analysis
  17. GRB 090902B: Faulkes Telescope North observations
  18. GRB 090902B: GROND NIR Afterglow Observations
  19. GRB 090902B: Gemini-N absorption redshift
  20. GRB 090902B: Enhanced Swift-XRT position
  21. GRB 090902B: Optical afterglow candidate
  22. GRB090902B: Swift/UVOT observations
  23. GRB 090902B: Swift/XRT Afterglow Candidate
  24. GRB 090902B: Fermi LAT detection
  25. GRB 090831C BAT refined analysis
  26. GRB 090831C: GROND upper limits
  27. Swift Trigger 361477, called GRB090831B, is probably not real.
  28. GRB090831C: Swift/UVOT upper limits
  29. GRB 090831C: Swift XRT Refined Analysis
  30. GRB 090831C: Enhanced Swift-XRT position
  31. GRB 090831C: Swift detection of a burst
  32. GRB 090831B, RIMOTS optical upper limits
  33. GRB 090831B: Swift detection of a possible burst
  34. GRB 090827: Swift XRT and UVOT observations
  35. GRB 090827 Burst discovered in BAT ground analysis
  36. GRB 090823: Swift XRT possible detection of the X-ray afterglow
  37. GRB 090823: Confirmation of Swift-BAT position by BAT Slew Survey
  38. GRB 090823 Correction to BAT position
  39. GRB 090817: No host galaxy, no supernova
  40. Konus-Wind observations of GRB 090823
  41. GRB 090823 Long burst with IPN triangulation and BAT position
  42. GRB 090817: Swift/UVOT Observations of a Possible Late-Time Brightening
  43. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  44. GRB 090817: Liverpool Telescope Observations
  45. GRB 090817: Confirmation of the X-ray afterglow
  46. GRB 090815C: Swift refined analysis
  47. GRB 090817: Swift/UVOT Upper Limits
  48. GRB 090812: Konus-Wind and Swift/BAT joint spectral analysis
  49. GRB 090817: Swift-XRT observations
  50. GRB 090813: Suzaku WAM observation of the prompt emission
  51. GRB 090812: Suzaku WAM observation of the prompt emission
  52. GRB 090813: CrAO optical obsevations
  53. GRB 090814B: Confirmation of the X-ray afterglow
  54. GRB 090814B: I-band observations from 1.23m CAHA telescope
  55. GRB 090814B: Swift/UVOT Upper Limits
  56. GRB 090814B: Liverpool Telescope Observations
  57. GRB 090814B: Swift-XRT detection of a possible afterglow.
  58. GRB 090814A: Swift/UVOT Observations
  59. GRB 090814A: Swift-XRT Team Refined Analysis
  60. GRB 090814A, RIMOTS optical upper limits
  61. GRB 090814A: Swift-BAT refined analysis
  62. GRB 090814: Enhanced Swift-XRT position
  63. GRB 090814: GROND Detection of an Optical Afterglow Candidate
  64. GRB 090814: Swift detection of a burst
  65. GRB 090813: Fermi GBM observation
  66. GRB 090813: Swift-XRT refined analysis
  67. GRB 090813, Swift-BAT refined analysis
  68. Konus-Wind observations of GRB090813
  69. GRB090813: Swift/UVOT upper limits
  70. GRB 090813: Enhanced Swift-XRT position
  71. GRB 090813: Liverpool Telescope afterglow confirmation
  72. GRB 090813: Swift detection of a burst
  73. GRB 090812: WIRO NIR upper limit
  74. GRB 090812: Faulkes Telescope South Continued Optical Monitoring
  75. GRB 090812: RAPTOR detections during the burst
  76. GRB 090812: Swift XRT refined analysis
  77. GRB 090812, RIMOTS optical upper limits
  78. GRB 090812 Swift-BAT Refined Analysis
  79. GRB090812: Swift/UVOT observations
  80. GRB 090812: GROND Observations of the Optical/NIR Afterglow
  81. GRB 090812: Enhanced Swift-XRT position
  82. GRB 090812: Liverpool Telescope afterglow confirmation
  83. GRB 090812: Swift detection of a burst with an optical counterpart
  84. GRB 090809: Swift-XRT refined analysis
  85. GRB090809: Swift/UVOT observations
  86. GRB 090809: Enhanced Swift-XRT position
  87. GRB 090809: Swift-BAT refined analysis
  88. GRB 090809: Swift detection of a burst with a possible optical counterpart
  89. GRB 090807: Liverpool Telescope observations
  90. GRB 090807: Swift/UVOT Upper Limits
  91. GRB 090807: Swift-XRT refined analysis
  92. GRB 090807, Swift-BAT refined analysis
  93. GRB 090807: Enhanced Swift-XRT position
  94. GRB 090807, RIMOTS optical upper limits
  95. GRB 090807: Swift detection of a burst
  96. GRB 090726: optical observation
  97. Swift-BAT trigger 358760 is most likely not a GRB
  98. Swift trigger 358760 is probably a noise event
  99. GRB 090709A : Quick look analysis of the Suzaku observation
  100. GRB 090728: Swift-BAT refined analysis

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