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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"

19606 results found.

  1. GRB 090429: Swift detection of a burst
  2. GRB 090424 : Multiband Optical observation from Nainital
  3. GRB 090423: CARMA mm observations
  4. GRB 090423: millimeter detection
  5. GRB 090426: Swift/BAT spectral lag results
  6. GRB 090424: Suzaku WAM observation of the prompt emission
  7. GRB 090426: GROND Observations of the Optical/NIR Afterglow
  8. GRB090426 Swift/UVOT observations
  9. GRB 090426: Swift-BAT refined analysis
  10. GRB 090426: Swift-XRT refined analysis
  11. GRB 090423: GROND second epoch imaging and refined SED
  12. GRB 090426: Enhanced Swift-XRT position
  13. GRB 090426, RIMOTS optical upper limits
  14. GRB 090426: TNT confimation of optical counterpart
  15. GRB 090426: Swift detection of a burst with an optical counterpart
  16. GRB 090424: MASTER-Net prompt optical limit
  17. VLA radio observation of high-z GRB 090423
  18. GRB 090424: THO optical observations
  19. GRB 090424: GROND Observations of the Optical/NIR Afterglow
  20. GRB 090423: Swift/BAT spectral lag results
  21. GRB 090424: Swift-XRT refined analysis
  22. GRB 090423: energetic, luminosity and jet break
  23. Swift/UVOT observations of GRB 090424
  24. GRB 090424: Enhanced Swift-XRT position
  25. GRB 090424: Swift-BAT refined analysis
  26. GRB 090424: Fermi GBM Observation
  27. GRB 090423: Fermi GBM observation
  28. GRB 090422: Fermi GBM observation
  29. GRB 090423: Ep,i - Eiso correlation
  30. GRB 090424: SDSS Galaxy at the Swift position
  31. GRB 090424: TNT optical observations
  32. GRB 090424: ROTSE-III Confimation of Optical Counterpart
  33. GRB 090424: Swift detection of a burst with an optical counterpart
  34. GRB 090423: GROND detection and preliminary photo-z
  35. GRB 090423: Swift-XRT refined analysis
  36. GRB090423 - Swift/UVOT upper limits.
  37. GRB 090423: NIR photometry and evidence for spectral break
  38. GRB 090422: Swift-XRT refined analysis
  39. GRB090423, RIMOTS optical upper limits
  40. GRB 090423: Enhanced Swift-XRT position
  41. GRB 090423: Swift-BAT refined analysis
  42. GRB 090422: Swift/UVOT Upper Limits
  43. GRB 090423: Faulkes Telescope South observations
  44. GRB 090418A: R and I band observation
  45. GRB 090423: Swift detection of a burst
  46. GRB 090422: Liverpool Telescope possible candidate
  47. GRB 090418A: Konus-Wind and Swift/BAT joint spectral analysis
  48. GRB 090422: Swift-BAT refined analysis
  49. GRB 090422: Enhanced Swift-XRT position
  50. GRB 090422: Liverpool Telescope observations
  51. GRB 090422: Swift detection of a burst
  52. GRB 090418A: Swift/UVOT Detection of the Neighbouring Galaxy
  53. Swift-BAT trigger 349718 is not a burst
  54. GRB 090417B: Optical observation
  55. GRB 090418A: optical observations
  56. GRB 090419: Swift/UVOT Observations
  57. GRB 090418B: Faulkes Telescope North observations
  58. GRB 090418A: Swift/UVOT Observations
  59. GRB 090417B: Swift/UVOT Upper Limits
  60. GRB 090417B Correction to the BAT refined analysis position
  61. GRB 090419: Swift-XRT refined analysis
  62. Konus-Wind observation of GRB 090418B
  63. GRB 090419: GROND detection of afterglow candidate
  64. GRB 090419: Swift-BAT refined analysis
  65. VLA radio upper limit on GRB 090417B
  66. GRB 090419: Enhanced Swift-XRT position
  67. GRB 090418: Swift XRT refined analysis
  68. GRB 090418A: ROTSE-III Refined Analysis
  69. GRB 090419: Swift detection of a burst
  70. GRB 090418B: Detection of a bright burst from Swift-BAT slew data
  71. GRB 090418: Swift-BAT refined analysis
  72. GRB 090417B: Swift-XRT refined analysis
  73. GRB 090418: Enhanced Swift-XRT position
  74. GRB 090417B: Swift-BAT further refined analysis
  75. GRB 090418: PAIRITEL NIR detection
  76. GRB 090418: ROTSE-III Confirmation of Optical Counterpart
  77. GRB 090418: Swift detection of a burst with optical afterglow
  78. GRB 090417B: Liverpool Telescope observations
  79. GRB 090417B: Swift-BAT refined analysis
  80. GRB 090417A: Swift-BAT refined analysis
  81. GRB 090417B: Swift detection of a burst
  82. GRB 090417: 2MASS galaxy within BAT Localization
  83. GRB 090417: Swift detection of a short burst
  84. GRB 090410: Suzaku WAM observation of the prompt emission
  85. GRB 090410: Swift-BAT refined analysis
  86. GRB 090410: Swift detection of a burst
  87. Swift-BAT Trigger 348781 is not a GRB
  88. Swift-BAT Trigger 348720 is not a GRB
  89. GRB090408, RIMOTS optical upper limits
  90. Swift-BAT trigger 348781: almost certainly not a burst
  91. GRB 090408B: MASTER II-Kourovka optical observations
  92. GRB 090408: Swift detection of a burst
  93. GRB 090407: Swift-XRT refined analysis
  94. GRB 090407: Swift UVOT Upper Limits
  95. GRB 090407: Enhanced Swift-XRT position
  96. GRB 090407: Swift-BAT refined analysis
  97. GRB 090407: ROTSE-III Optical Limits
  98. GRB 090407: Swift detection of a burst
  99. GRB 090404: millimeter detection
  100. GRB 090404: nIR observations at Calar Alto

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