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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').
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"

21787 results found.

  1. GRB 090102: GROND observations of the optical afterglow
  2. GRB 090102: NOT redshift
  3. GRB 090102: Enhanced Swift-XRT position
  4. GRB 090102: REM observations of a bright afterglow
  5. GRB 090102: Swift detection of a burst with an optical counterpart
  6. GRB 090102: TAROT Calern observatory optical observations
  7. GRB 081230: GROND confirmation of the afterglow
  8. GRB 081230, Swift-BAT refined analysis
  9. GRB081230: Swift-XRT refined analysis
  10. GRB 081230 Swift/UVOT Observations
  11. GRB 081230: Enhanced Swift-XRT position
  12. GRB 081230: Swift detection of a burst
  13. GRB 081228, Swift-BAT refined analysis
  14. VLA radio detection of GRB 081221
  15. GRB 081228: Swift/UVOT Upper Limits
  16. GRB 081228: Swift-XRT Team refined analysis
  17. GRB 081228: detection by GROND
  18. GRB 081228: Enhanced Swift-XRT position
  19. GRB 081228: TAROT Calern observatory optical observations
  20. GRB 081228: Swift detection of a burst
  21. VLA radio observation of GRB 081221
  22. GRB 081226B: Swift XRT and UVOT upper limits
  23. GRB 081224: Suzaku WAM observation of the prompt emission
  24. GRB 081226: Swift-XRT refined analysis
  25. GRB 081226A: Swift UVOT Upper Limits
  26. GRB 081226: GROND afterglow candidate
  27. GRB 081226: ROTSE-III Optical Limits
  28. GRB 081226: Swift detection of a possible short-hard burst
  29. GRB 080810: optical observations
  30. GRB 081211B: optical observations
  31. GRB 081224: Swift-XRT observation
  32. GRB 081222: MITSuME optical observation
  33. GRB 081224: Fermi GBM Detection & LAT Localization
  34. Konus-Wind observation of GRB 081222
  35. GRB 081221: GROND observations
  36. VLA radio upper limit on GRB 081222
  37. GRB 081221: Probable host galaxy in Keck imaging
  38. GRB 081222, Swift-BAT refined analysis
  39. GRB081222 optical limit by "Pi of the Sky"
  40. Konus-Wind observation of very bright GRB 081215A
  41. GRB 081222: Swift XRT refined analysis
  42. IPN triangulation of bright GRB 081215A
  43. GRB 081222: Faulkes Telescope South observations
  44. GRB 081221: Gemini-N nIR imaging
  45. GRB081222, optical observation
  46. GRB081203A: BTA observation
  47. Konus-Wind observation of GRB 081221
  48. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  49. GRB081222: REM candidate afterglow
  50. GRB 081222: Swift detection of a burst with a bright optical afterglow
  51. GRB 081221: Enhanced Swift-XRT position
  52. GRB 081221: further NOT observations
  53. GRB 081221: NOT observations
  54. GRB 081221: Swift detection of a burst
  55. GRB 081216: Suzaku WAM observation of the prompt emission
  56. GRB 081215A: Fermi GBM detection (correction to event fluence)
  57. GRB 081118: Zadko observations
  58. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  59. GRB 0811215A: MASTER prompt optical observations
  60. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  61. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  62. Possible GRB 081211B: Swift/UVOT Upper Limits
  63. Possible GRB 081211B - Swift-XRT analysis
  64. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  65. GRB 081210, SMARTS optical/IR observations
  66. GRB 081211: Enhanced Swift-XRT position
  67. GRB 081211: Swift detection of a burst
  68. GRB081203B: optical observations
  69. GRB 081210: Enhanced Swift-XRT position
  70. GRB 081210: Swift detection of a burst with optical afterglow
  71. Konus-Wind observation of GRB 081209
  72. IPN triangulation of short hard GRB 081209
  73. GRB 081203A: optical observations
  74. GRB 081128: afterglow observations
  75. GRB 081203B: Suzaku WAM observation of the prompt emission
  76. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  77. GRB081203A: Optical observations at Ishigaki
  78. GRB 081128: Optical afterglow observations
  79. GRB 081204: GROND Observations
  80. Radio detection of GRB 081203B with the VLA
  81. GRB081203A: Radio upper limit at 15 GHz
  82. GRB 081204: Swift/UVOT Upper Limits
  83. GRB081203A: MITSuME optical observation
  84. GRB081203A: optical observation
  85. VLA Radio upper limit on GRB 081203A
  86. Konus-Wind observation of GRB 081203A
  87. Konus-Wind observation of GRB 081203B
  88. GRB 081203B: optical observations
  89. Swift/UVOT detection of GRB081203B
  90. GRB 081203B: Swift-XRT candidate afterglow.
  91. GRB 081203A: optical observations
  92. GRB 081203: Enhanced Swift-XRT position
  93. GRB 081130B: MASTER prompt optical observations
  94. GRB081203: optical observation
  95. GRB 081203: Swift detection of a burst with a bright optical counterpart
  96. Swift Trigger 335971: Swift/UVOT Observations
  97. GRB 081126: afterglow photometry
  98. VLA Radio upper limit on GRB 081126
  99. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  100. GRB 081128A: optical observations

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