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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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').
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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"

26340 results found.

  1. GRB 090117 - SuperAGILE Localization of a long GRB
  2. GRB 090112B: Suzaku WAM observation of the prompt emission
  3. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  4. GRB 090113: GROND Upper Limits
  5. GRB 090113: Swift-XRT refined analysis
  6. GRB 090113: Enhanced Swift-XRT position
  7. GRB 090113: Swift-BAT refined analysis
  8. GRB 090112B: Fermi GBM Detection
  9. GRB 090113: Swift detection of a burst
  10. GRB 090112: Fermi GBM detection
  11. GRB 090109: Fermi GBM detection
  12. GRB 090108B: Fermi GBM detection
  13. GRB 090111, Swift-BAT refined analysis
  14. GRB 090108: Fermi GBM Detection
  15. GRB 090111: Swift-XRT refined analysis
  16. GRB 090111: Enhanced Swift-XRT position
  17. GRB 090111: Swift detection of a burst
  18. GRB 090107B: Suzaku WAM observation of the prompt emission
  19. GRB090107B: Fermi GBM Detection
  20. GRB 090107B: Swift XRT afterglow confirmation
  21. GRB 090107B: a long GRB localized by INTEGRAL
  22. Fermi/GBM detection of GRB 081226A
  23. Fermi/GBM detection of GRB 081225
  24. GRB 090107: Swift-BAT refined analysis
  25. GRB 090107: Swift detection of a burst
  26. GRB 081231: Fermi GBM Detection
  27. GRB 090102: optical decay
  28. VLA radio upper limit on GRB 090102
  29. GRB 090102: GRT Optical Observation
  30. Konus-Wind observation of GRB 090102
  31. GRB 081229: Fermi GBM detection
  32. GRB 090102: Hobby-Eberly Telescope Spectroscopy
  33. GRB 090102: P60 Imaging and P200 Spectroscopy
  34. GRB 090102: GROND observations of the optical afterglow
  35. Swift UVOT observations of GRB 090102
  36. GRB 090102: Swift-BAT refined analysis
  37. GRB 090102: Swift burst of interest
  38. GRB 090102: Swift XRT refined analysis
  39. GRB 090102: NOT redshift
  40. GRB 090102: Enhanced Swift-XRT position
  41. GRB 090102: TAROT Calern observatory optical light curve
  42. GRB 090102: REM observations of a bright afterglow
  43. GRB 090102: Swift detection of a burst with an optical counterpart
  44. GRB 090102: TAROT Calern observatory optical observations
  45. GRB 081230, Swift-BAT refined analysis
  46. GRB081230: Swift-XRT refined analysis
  47. GRB 081230 Swift/UVOT Observations
  48. GRB 081230: Enhanced Swift-XRT position
  49. GRB 081230: Swift detection of a burst
  50. GRB 081228: GROND confirmation of the optical/NIR afterglow
  51. GRB 081226B: Fermi GBM observation
  52. GRB 081226C: Fermi GBM detection
  53. GRB 081228, Swift-BAT refined analysis
  54. VLA radio detection of GRB 081221
  55. GRB 081228: Swift/UVOT Upper Limits
  56. GRB 081228: Swift-XRT Team refined analysis
  57. GRB 081228: detection by GROND
  58. GRB 081228: Enhanced Swift-XRT position
  59. GRB 081228: TAROT Calern observatory optical observations
  60. GRB 081228: Swift detection of a burst
  61. VLA radio observation of GRB 081221
  62. GRB 081224: Suzaku WAM observation of the prompt emission
  63. GRB 081226: Swift-XRT refined analysis
  64. GRB 081226A: Swift-BAT refined analysis
  65. GRB 081226B: a short-hard GRB detected by INTEGRAL
  66. GRB 081226: Gemini-South imaging
  67. GRB 081226: Swift detection of a possible short-hard burst
  68. GRB 080810: optical observations
  69. GRB 080810: optical observations
  70. Konus-Wind observation of GRB 081222
  71. GRB 081223: Fermi GBM detection
  72. GRB 081221: GROND observations
  73. GRB 081222:Optical afterglow observation
  74. VLA radio upper limit on GRB 081222
  75. GRB 081222: Fermi GBM observation
  76. GRB 081221: Probable host galaxy in Keck imaging
  77. GRB 081204C: Fermi GBM detection
  78. GRB 081222, Swift-BAT refined analysis
  79. GRB 081221, Swift-BAT refined analysis
  80. GRB081222 optical limit by "Pi of the Sky"
  81. Konus-Wind observation of very bright GRB 081215A
  82. GRB 081222: Swift XRT refined analysis
  83. GRB081221: Fermi GBM observation
  84. GRB 081221: Swift-XRT Refined Analysis
  85. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  86. GRB 081222: Faulkes Telescope South observations
  87. Konus-Wind observation of GRB 081221
  88. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  89. GRB 081222: Swift detection of a burst with a bright optical afterglow
  90. GRB 081221: Enhanced Swift-XRT position
  91. GRB 081221: further NOT observations
  92. GRB 081221: Swift detection of a burst
  93. GRB 081217: Fermi GBM detection
  94. GRB081215A: Fermi-LAT observations
  95. GRB 081211B: Further Swift-XRT analysis
  96. GRB 081215B: Fermi GBM detection
  97. GRB 081216: Suzaku WAM observation of the prompt emission
  98. GRB 081216 : Fermi GBM observation
  99. GRB 081215A: Fermi GBM detection
  100. GRB 081211B - possibly a short burst with extended emission

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