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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"

23628 results found.

  1. GRB 090426: Near infrared observation with ISLE at OAO
  2. GRB 090426: Okayama MITSuME optical observation
  3. GRB 090426 Keck LRIS redshift
  4. GRB 090426: Swift-BAT refined analysis
  5. GRB 090423: GROND second epoch imaging and refined SED
  6. GRB 090426: Swift detection of a burst with an optical counterpart
  7. GRB090424: R-band detection (37.5 hrs post-burst), jet break?
  8. GRB 090424: MASTER-Net prompt optical limit
  9. GRB090424: BVRI/R-band detection after 15 hrs burst
  10. GRB 090424: GROND Observations of the Optical/NIR Afterglow
  11. GRB090423: Y-band limit
  12. GRB 090423: Y-band field calibration update/correction
  13. GRB 090423: Swift/BAT spectral lag results
  14. GRB 090424: Liverpool Telescope observations
  15. GRB 090424: Optical observations from 1.23m CAHA
  16. GRB 090423: energetic, luminosity and jet break
  17. GRB 090424: MASTER-Net prompt optical observations
  18. GRB 090424: Swift-BAT refined analysis
  19. GRB 090424: Fermi GBM Observation
  20. GRB 090422: Fermi GBM observation
  21. GRB 090424: ROTSE-III Confimation of Optical Counterpart
  22. GRB 090424: Swift detection of a burst with an optical counterpart
  23. GRB 090423: Refined TNG analysis
  24. GRB090423: Y-band field calibration
  25. GRB 090423: Near infrared observation at Okayama Observatory
  26. GRB 090423: Deep z-band upper limit and confirmation of photo-z
  27. GRB 090423: TNG Amici spectrum
  28. GRB 090423: Swift-XRT refined analysis
  29. GRB090423 - Swift/UVOT upper limits.
  30. GRB 090422: Swift-XRT refined analysis
  31. GRB090423, RIMOTS optical upper limits
  32. GRB 090423: Swift-BAT refined analysis
  33. GRB 090423: Faulkes Telescope South observations
  34. GRB 090423: Swift detection of a burst
  35. GRB 090418A: Konus-Wind and Swift/BAT joint spectral analysis
  36. GRB 090422: Swift-BAT refined analysis
  37. GRB 090418B: RTT150 optical observations
  38. GRB 090418A: RTT150 optical observations
  39. GRB 090422: Liverpool Telescope observations
  40. GRB 090418B: Suzaku WAM observation of the prompt emission
  41. GRB 090422: Swift detection of a burst
  42. GRB 090418C: Fermi GBM Detection
  43. Swift-BAT trigger 349718 is not a burst
  44. GRB 090419: Swift/UVOT Observations
  45. GRB 090418B: Faulkes Telescope North observations
  46. GRB 090419: Swift-XRT refined analysis
  47. Konus-Wind observation of GRB 090418B
  48. GRB 090418: Erratum in GCN 9168
  49. GRB 090418: Optical observations with MITSuME Okayama and Ishigaki 1m telescope
  50. GRB 090419: Swift-BAT refined analysis
  51. GRB 090418: Swift XRT refined analysis
  52. GRB 090419: Swift detection of a burst
  53. GRB 090418B: Detection of a bright burst from Swift-BAT slew data
  54. GRB 090418: Swift-BAT refined analysis
  55. GRB 090417B: Galaxy redshift
  56. GRB 090417B: Swift-BAT further refined analysis
  57. GRB 090418: PAIRITEL NIR detection
  58. GRB 090418 Lick Redshift
  59. GRB 090418: Swift detection of a burst with optical afterglow
  60. GRB 090411B: Suzaku WAM observation of the prompt emission
  61. GRB 090411A: Suzaku WAM observation of the prompt emission
  62. GRB 090417B: MITSuME Okayama optical upper limits
  63. GRB 090417B: Swift-BAT refined analysis
  64. GRB 090417A: Swift-BAT refined analysis
  65. GRB 090417B: Swift detection of a burst
  66. GRB 090417: Swift detection of a short burst
  67. GRB 090412: Fermi GBM detection
  68. GRB 090411B: Fermi GBM detection
  69. GRB 090411A: Fermi GBM detection
  70. GRB 090410: Suzaku WAM observation of the prompt emission
  71. GRB 090410: MITSuME optical upper limits
  72. GRB 090408b: IPN Triangulation
  73. GRB 090328b: IPN Triangulation
  74. GRB 090410: Swift-BAT refined analysis
  75. GRB 090410: Swift detection of a burst
  76. Konus-Wind and Konus-RF observations of GRB 090408b
  77. Swift-BAT Trigger 348781 is not a GRB
  78. Swift-BAT Trigger 348720 is not a GRB
  79. Swift-BAT trigger 348781: almost certainly not a burst
  80. GRB 090408B: MASTER II-Kourovka optical observations
  81. GRB 090408: Swift detection of a burst
  82. GRB 090407: GROND upper limits
  83. GRB 090407: Swift-BAT refined analysis
  84. Konus-Wind and Konus-RF observations of GRB 090406
  85. GRB 090407: Swift detection of a burst
  86. GRB 090404: millimeter detection
  87. GRB 090404: nIR observations at Calar Alto
  88. GRB 090403: Fermi GBM detection
  89. GRB 090404: optical observations at BOOTES-3 and 1.5-m OSN
  90. GRB 090404: Swift-BAT refined analysis
  91. GRB 090404: Swift detection of a burst
  92. GRB 090401A: Suzaku WAM observation of the prompt emission
  93. GRB 090401B: Suzaku WAM observation of the prompt emission
  94. Konus-Wind observation of GRB 090401B
  95. GRB 090401B: Upper limits of MITSuME optical observation
  96. GRB 090401B: AGILE refined analysis
  97. Konus-Wind observation of GRB 090401A
  98. AGILE Gamma-ray detection of GRB 090401B
  99. GRB 090401B: Swift-BAT refined analysis
  100. GRB 090401B: Swift detection of a burst

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