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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"

38579 results found.

  1. GRB 091003: Lick observations and possible SDSS host galaxy
  2. GRB 091003: WHT ACAM observations
  3. Konus-Wind observation of GRB 091003A
  4. GRB 090929B: Suzaku WAM observation of the prompt emission
  5. GRB 090929A: Suzaku WAM observation of the prompt emission
  6. GRB 091003: Swift-XRT confirmation of fading afterglow
  7. GRB 091003: Swift/UVOT Detection of an Optical Afterglow
  8. GRB 091003: UVOT-enhanced XRT position
  9. GRB 091003: Swift UVOT Detection of a Candidate UV Afterglow
  10. GRB 091003: Swift XRT analysis
  11. GRB 091003A: Fermi LAT detection
  12. GRB 091003A: Fermi GBM detection
  13. GRB 090929A: Swift/UVOT Observations
  14. Trigger 371210: Swift/BAT Triggered on IGR J17511-3057
  15. GRB 090929A: Swift-XRT non-detection
  16. Konus-Wind observation of GRB 090929A
  17. Konus-Wind observation of GRB 090929B
  18. GRB 090927: Fermi GBM observation
  19. GRB 090929B: Swift-XRT refined analysis
  20. GRB 090926A: Fermi LAT and GBM refined analysis
  21. GRB 090929B: Gemini-N upper limits
  22. GRB 090929B: Swift/UVOT Observations
  23. Konus-RF observation of GRB 090929A
  24. GRB 090929A BAT location of the Fermi GBM burst
  25. Correction: GRB 090929B: Enhanced Swift-XRT position
  26. GRB 090929: Enhanced Swift-XRT position
  27. GRB 090929B: Swift detection of a burst
  28. GRB 090929A: Fermi GBM detection
  29. GRB090926A: Swift-XRT refined analysis
  30. GRB 090927: Faulkes Telescope South Detection of the Optical Afterglow
  31. Konus-Wind and Konus-RF observations of GRB 090926A
  32. GRB 090927: VLT redshift
  33. GRB 090926B: Fermi GBM detection
  34. GRB 090927: Zadko Telescope observations
  35. Swift/UVOT observations of GRB 090927
  36. GRB 090927: Swift XRT refined analysis
  37. GRB 090926A: Suzaku WAM observation of the prompt emission
  38. GRB 090927: Enhanced Swift-XRT position
  39. GRB090926B: Swift/UVOT Upper Limits
  40. GRB090926A: Swift/UVOT observations
  41. GRB 090926B: VLT spectroscopy
  42. GRB 090927: Swift/UVOT detection of an optical afterglow
  43. GRB 090927: Swift detection of a short burst
  44. GRB 090926B: optical object in error circle
  45. GRB 090926B: MAXI GSC detection
  46. GRB 090926A: VLT/X-shooter redshift
  47. GRB 090926B: NOT optical observation
  48. GRB 090926B: Swift XRT refined analysis
  49. GRB 090926A: Swift/UVOT detection of an optical afterglow
  50. GRB090926A: UVOT-enhanced XRT position
  51. GRB 090926B: Swift detection of a burst
  52. GRB 090926: Fermi LAT detection
  53. GRB 090926: Fermi GBM detection
  54. GRB 090925: Fermi GBM detection
  55. GRB090904B : IRSF NIR upper limit
  56. GRB090922A: correction to Fermi location
  57. GRB 090922A: Fermi GBM detection
  58. Swift returns to normal operations
  59. GRB 090916: Swift-XRT upper limit
  60. GRB 090915: GROND upper limits
  61. Swift-BAT temporarily off-line for a few days
  62. GRB 090912: optical observation
  63. GRB 090915: Swift/UVOT detection of an optical afterglow candidate
  64. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  65. GRB 090916: Swift detection of a short burst
  66. GRB 090915 Swift-BAT detection of a burst in ground analysis
  67. GRB 090827: Confirmation of the X-ray afterglow
  68. GRB 090912: Swift-XRT refined analysis
  69. GRB 090912: Swift/UVOT Upper Limits
  70. GRB 090912 optical upper limit
  71. GRB 090912: Enhanced Swift-XRT position
  72. GRB 090912: Swift detection of a burst
  73. GRB 090910: Fermi GBM detection
  74. GRB 090823: Swift XRT confirmation of the X-ray afterglow
  75. GRB 090904B: GROND detection of the optical afterglow
  76. GRB 090831A: Suzaku WAM observation of the prompt emission
  77. GRB 090904A: Swift/UVOT Refined Analysis
  78. GRB 090904B: Swift/UVOT Refined Analysis
  79. GRB 090902B: Suzaku WAM observation of the prompt emission
  80. GRB 090829A: Suzaku WAM observation of the prompt emission
  81. GRB 090904B: Fermi GBM detection
  82. GRB 090904A: Swift-XRT refined analysis
  83. GRB 090904B: Swift XRT Refined Analysis
  84. GRB 090904B: MOA-II Optical observation
  85. GRB 090904A: Enhanced Swift XRT position
  86. GRB 090902B: VLA radio detection
  87. GRB 090904A: Swift-BAT refined analysis
  88. GRB 090904B: Enhanced Swift-XRT position
  89. GRB090904A: Correction to enhanced XRT position
  90. GRB 090904A: Enhanced Swift-XRT position
  91. GRB 090904A: NOT observations
  92. GRB 090902B: WSRT Radio Observation
  93. GRB090904B: REM observations
  94. GRB 090904B: Swift detection of a burst
  95. GRB 090904A: ROTSE-III Optical Limits
  96. GRB 090904: Swift detection of a burst
  97. GRB 090902B: ROTSE-III Detection of Optical Afterglow
  98. GRB 090902B: Swift/UVOT refined analysis
  99. GRB090902B: Swift XRT refined analysis
  100. GRB 090902B: Faulkes Telescope North observations

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