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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"

23611 results found.

  1. GRB 090112B: Fermi GBM Detection
  2. GRB 090113: Swift detection of a burst
  3. GRB 090112: Fermi GBM detection
  4. GRB 090111, Swift-BAT refined analysis
  5. GRB 090111: Swift detection of a burst
  6. GRB 090107B: Suzaku WAM observation of the prompt emission
  7. GRB 090107B: Swift XRT afterglow confirmation
  8. GRB 090107B: Swift-XRT detection of possible afterglow
  9. GRB 090107B: a long GRB localized by INTEGRAL
  10. Fermi/GBM detection of GRB 081226A
  11. Fermi/GBM detection of GRB 081225
  12. GRB 090107: Swift-BAT refined analysis
  13. GRB 090107: Swift detection of a burst
  14. GRB 081231: Fermi GBM Detection
  15. Swift triggered on the HMXB 1A 1118-61
  16. Konus-Wind observation of GRB 090102
  17. GRB 081229: Fermi GBM detection
  18. GRB 090102: P60 Imaging and P200 Spectroscopy
  19. GRB 090102: GROND observations of the optical afterglow
  20. GRB 090102: Swift-BAT refined analysis
  21. GRB 090102: Swift XRT refined analysis
  22. GRB 090102: TAROT Calern observatory optical light curve
  23. GRB 090102: TAROT Calern observatory optical observations
  24. GRB 081230: GROND confirmation of the afterglow
  25. GRB 081230, Swift-BAT refined analysis
  26. GRB 081228, Swift-BAT refined analysis
  27. GRB 081228: detection by GROND
  28. GRB 081228: TAROT Calern observatory optical observations
  29. GRB 081224: Suzaku WAM observation of the prompt emission
  30. GRB 081226: Second epoch of Gemini-South imaging
  31. GRB 081226A: Swift-BAT refined analysis
  32. GRB 081226B: a short-hard GRB detected by INTEGRAL
  33. GRB 081226: GROND afterglow candidate
  34. GRB 080810: optical observations
  35. GRB 081211B: optical observations
  36. GRB 081222: MITSuME optical observation
  37. GRB 080810: optical observations
  38. Konus-Wind observation of GRB 081222
  39. GRB 081221: GROND observations
  40. GRB 081222:Optical afterglow observation
  41. GRB 081222, Swift-BAT refined analysis
  42. GRB 081221, Swift-BAT refined analysis
  43. Konus-Wind observation of very bright GRB 081215A
  44. GRB081221: Fermi GBM observation
  45. Swift/UVOT observations of GRB 081221
  46. IPN triangulation of bright GRB 081215A
  47. GRB081203A: BTA observation
  48. Konus-Wind observation of GRB 081221
  49. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  50. GRB 081222: Swift detection of a burst with a bright optical afterglow
  51. GRB 081221: Swift detection of a burst
  52. GRB 081217: Fermi GBM detection
  53. Modification of Swift/UVOT response to bright GRBs
  54. GRB 081216: Suzaku WAM observation of the prompt emission
  55. GRB 081216 : Fermi GBM observation
  56. GRB 081215A: Fermi GBM detection
  57. IPN localization of short hard GRB 081216
  58. GRB 081118: Zadko observations
  59. GRB 081207: Fermi GBM detection
  60. GRB 081209: Fermi GBM detection
  61. GRB 081210: Xinglong TNT R band Upper Limits
  62. GRB 081211: Swift detection of a burst
  63. GRB081203B: optical observations
  64. GRB 081210: Swift-BAT refined analysis
  65. GRB 081210: Swift detection of a burst with optical afterglow
  66. Konus-Wind observation of GRB 081209
  67. IPN triangulation of short hard GRB 081209
  68. GRB 081203A: optical observations
  69. GRB 081206C: Fermi GBM detection
  70. GRB 081128: afterglow observations
  71. GRB 081203B: Suzaku WAM observation of the prompt emission
  72. GRB 081203B: Additional Gemini imaging
  73. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  74. GRB081203A: Optical observations at Ishigaki
  75. GRB 081204: GROND Observations
  76. GRB081203B: optical observations
  77. GRB081203A: MITSuME optical observation
  78. GRB 081203A: Skynet/GORT Detections
  79. GRB081203A: optical observation
  80. GRB 081204 : a long GRB localized by INTEGRAL
  81. Konus-Wind observation of GRB 081203A
  82. Konus-Wind observation of GRB 081203B
  83. GRB 081203B: optical observations
  84. GRB 081203A: optical observations
  85. Swift UVOT observations of GRB 081203A
  86. GRB081203A: Swift/UVOT grism redshift
  87. GRB 081203A: Burst detection from Swift-BAT slew data
  88. GRB 081203A: Swift-BAT refined analysis
  89. GRB 081130B: MASTER prompt optical observations
  90. GRB081203: optical observation
  91. GRB 081203: Swift detection of a burst with a bright optical counterpart
  92. GRB 081130B: Fermi GBM detection
  93. GRB 081126: afterglow photometry
  94. Trigger 335971: Swift possible detection of a burst
  95. GRB 081122B: Fermi GBM Detection
  96. GRB 081128: Swift-XRT refined analysis
  97. GRB081128: optical observations
  98. GRB 081128: Swift-BAT refined analysis
  99. GRB 081128: Swift detection of a burst
  100. GRB 081127: Swift-BAT refined analysis

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