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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"

19593 results found.

  1. GRB 090912: Enhanced Swift-XRT position
  2. GRB 090912: Swift detection of a burst
  3. GRB 090910: Fermi GBM detection
  4. GRB 090814A: Skynet/DSO & GORT Observations
  5. GRB 090823: Swift XRT confirmation of the X-ray afterglow
  6. GRB 090904B: GROND detection of the optical afterglow
  7. GRB 090904B: Swift/UVOT Refined Analysis
  8. GRB 090904B: Fermi GBM detection
  9. GRB 090904B: Swift-BAT refined analysis
  10. GRB 090902B: VLA radio detection
  11. GRB 090904B: Enhanced Swift-XRT position
  12. GRB 090904A: Enhanced Swift-XRT position
  13. GRB 090904A: NOT observations
  14. GRB090904B: REM observations
  15. GRB 090904B: Swift detection of a burst
  16. GRB 090904: Swift detection of a burst
  17. GRB 090902B: Swift/UVOT refined analysis
  18. GRB 090902B: GROND NIR Afterglow Observations
  19. GRB 090902B: Fermi LAT and GBM refined analysis.
  20. GRB 090902B: Enhanced Swift-XRT position
  21. GRB090902B: Swift/UVOT observations
  22. GRB 090902B: Swift/XRT Afterglow Candidate
  23. GRB 090902B: Fermi LAT detection
  24. GRB 090902: Fermi GBM detection
  25. GRB 090831C: GROND upper limits
  26. Swift Trigger 361477, called GRB090831B, is probably not real.
  27. GRB090831C: Swift/UVOT upper limits
  28. GRB 090831B: MITSuME optical upper limits
  29. GRB 090829B: Fermi GBM Detection
  30. GRB 090831C: Enhanced Swift-XRT position
  31. GRB 090831C: Swift detection of a burst
  32. GRB 090831B, RIMOTS optical upper limits
  33. GRB 090831B: Swift detection of a possible burst
  34. GRB 090831: Fermi GBM detection
  35. GRB090829: Fermi GBM Detection
  36. Konus-Wind observations of GRB 090827
  37. GRB 090827: Swift XRT and UVOT observations
  38. GRB 090826: Fermi GBM detection
  39. GRB 090828: Fermi GBM detection
  40. GRB 090817 - TLS Observations
  41. GRB 090823: Swift XRT possible detection of the X-ray afterglow
  42. GRB 090823 Correction to BAT position
  43. GRB 090817: No host galaxy, no supernova
  44. GRB 090820B: Fermi GBM detection
  45. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  46. GRB 090820: MASTER-Net optical polarization observations
  47. GRB 090820: Fermi GBM Detection of a bright burst.
  48. GRB 090817: optical upper limit
  49. GRB 090817: Confirmation of the X-ray afterglow
  50. GRB 090815C: Swift refined analysis
  51. GRB 090817: Fermi GBM observation
  52. GRB 090817: Swift/UVOT Upper Limits
  53. GRB 090817: Swift-XRT observations
  54. GRB 090814A: optical observations
  55. GRB 090813: Suzaku WAM observation of the prompt emission
  56. VLA radio non-detection of GRB 090812
  57. GRB 090815B: Fermi GBM detection
  58. GRB 090815: Fermi GBM detection
  59. GRB 090813: CrAO optical obsevations
  60. GRB090814A: NOT optical follow-ups
  61. GRB 090814B: Swift/UVOT Upper Limits
  62. GRB 090814C: Fermi GBM detection
  63. GRB 090814B: Swift-XRT detection of a possible afterglow.
  64. GRB 090814A: Swift/UVOT Observations
  65. GRB 090814A, RIMOTS optical upper limits
  66. GRB 090814A: Swift-BAT refined analysis
  67. GRB090814A: VLT spectroscopy
  68. GRB 090814: Enhanced Swift-XRT position
  69. GRB 090814: GROND Detection of an Optical Afterglow Candidate
  70. GRB 090814: Swift detection of a burst
  71. GRB 090813: Fermi GBM observation
  72. Fermi Gamma-ray Burst Monitor trigger 271446248 is not a GRB
  73. GRB090813: Swift/UVOT upper limits
  74. GRB 090813: Enhanced Swift-XRT position
  75. GRB 090813: P60 Optical Afterglow Confirmation
  76. GRB 090813: Swift detection of a burst
  77. GRB 090812: Faulkes Telescope South Continued Optical Monitoring
  78. GRB 090812: RAPTOR detections during the burst
  79. GRB 090812, RIMOTS optical upper limits
  80. GRB090812: Swift/UVOT observations
  81. GRB 090812: GROND Observations of the Optical/NIR Afterglow
  82. GRB 090812: Enhanced Swift-XRT position
  83. GRB 090812: P60 Confirmation of Optical Afterglow
  84. GRB 090812: Swift detection of a burst with an optical counterpart
  85. GRB 090807B: Fermi GBM detection
  86. GRB 090809: Further NOT optical observations
  87. VLA radio upper limit on GRB 090809
  88. GRB 090809: WHT observations
  89. GRB 090809B: Fermi GBM detection
  90. GRB090809: Swift/UVOT observations
  91. GRB 090809: Enhanced Swift-XRT position
  92. GRB 090809: afterglow confirmation at the NOT
  93. GRB 090809: Swift detection of a burst with a possible optical counterpart
  94. GRB 090807: MITSuME optical upper limit
  95. GRB 090807: Swift/UVOT Upper Limits
  96. GRB 090807: Enhanced Swift-XRT position
  97. GRB 090807, RIMOTS optical upper limits
  98. GRB 090807: Swift detection of a burst
  99. GRB 090802: Fermi GBM detection
  100. GRB 090726: optical observation

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