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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"

21904 results found.

  1. GRB 090113: Swift detection of a burst
  2. GRB 090109: Fermi GBM detection
  3. GRB 090111: Swift UVOT Upper Limits
  4. GRB 090111: Enhanced Swift-XRT position
  5. GRB 090111: Swift detection of a burst
  6. GRB 090107B: Suzaku WAM observation of the prompt emission
  7. GRB 090107B: Swift XRT afterglow confirmation
  8. GRB 090107B: Swift/UVOT Observations
  9. GRB 090107B: Swift-XRT detection of possible afterglow
  10. GRB 090107B: ROTSE-III Optical Limits
  11. VLA radio upper limit on GRB 090102
  12. GRB 090102: GRT Optical Observation
  13. Swift triggered on the HMXB 1A 1118-61
  14. Konus-Wind observation of GRB 090102
  15. GRB 090102: Hobby-Eberly Telescope Spectroscopy
  16. GRB 090102: P60 Imaging and P200 Spectroscopy
  17. GRB 090102 Observations from IAC80
  18. GRB 090102: GROND observations of the optical afterglow
  19. GRB 090102: NOT redshift
  20. GRB 090102: Enhanced Swift-XRT position
  21. GRB 090102: REM observations of a bright afterglow
  22. GRB 090102: Swift detection of a burst with an optical counterpart
  23. GRB 090102: TAROT Calern observatory optical observations
  24. GRB 081230: GROND confirmation of the afterglow
  25. GRB 081230, Swift-BAT refined analysis
  26. GRB081230: Swift-XRT refined analysis
  27. GRB 081230 Swift/UVOT Observations
  28. GRB 081230: Enhanced Swift-XRT position
  29. GRB 081230: Swift detection of a burst
  30. GRB 081228, Swift-BAT refined analysis
  31. VLA radio detection of GRB 081221
  32. GRB 081228: Swift/UVOT Upper Limits
  33. GRB 081228: Swift-XRT Team refined analysis
  34. GRB 081228: detection by GROND
  35. GRB 081228: Enhanced Swift-XRT position
  36. GRB 081228: TAROT Calern observatory optical observations
  37. GRB 081228: Swift detection of a burst
  38. VLA radio observation of GRB 081221
  39. GRB 081226B: Swift XRT and UVOT upper limits
  40. GRB 081224: Suzaku WAM observation of the prompt emission
  41. GRB 081226: Swift-XRT refined analysis
  42. GRB 081226A: Swift UVOT Upper Limits
  43. GRB 081226: GROND afterglow candidate
  44. GRB 081226: ROTSE-III Optical Limits
  45. GRB 081226: Swift detection of a possible short-hard burst
  46. GRB 080810: optical observations
  47. GRB 081211B: optical observations
  48. GRB 081224: Swift-XRT observation
  49. GRB 081222: MITSuME optical observation
  50. GRB 081224: Fermi GBM Detection & LAT Localization
  51. Konus-Wind observation of GRB 081222
  52. GRB 081221: GROND observations
  53. VLA radio upper limit on GRB 081222
  54. GRB 081221: Probable host galaxy in Keck imaging
  55. GRB 081222, Swift-BAT refined analysis
  56. GRB081222 optical limit by "Pi of the Sky"
  57. Konus-Wind observation of very bright GRB 081215A
  58. GRB 081222: Swift XRT refined analysis
  59. IPN triangulation of bright GRB 081215A
  60. GRB 081222: Faulkes Telescope South observations
  61. GRB 081221: Gemini-N nIR imaging
  62. GRB081222, optical observation
  63. GRB081203A: BTA observation
  64. Konus-Wind observation of GRB 081221
  65. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  66. GRB081222: REM candidate afterglow
  67. GRB 081222: Swift detection of a burst with a bright optical afterglow
  68. GRB 081221: Enhanced Swift-XRT position
  69. GRB 081221: further NOT observations
  70. GRB 081221: NOT observations
  71. GRB 081221: Swift detection of a burst
  72. GRB 081216: Suzaku WAM observation of the prompt emission
  73. GRB 081215A: Fermi GBM detection (correction to event fluence)
  74. GRB 081118: Zadko observations
  75. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  76. GRB 0811215A: MASTER prompt optical observations
  77. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  78. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  79. Possible GRB 081211B: Swift/UVOT Upper Limits
  80. Possible GRB 081211B - Swift-XRT analysis
  81. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  82. GRB 081210, SMARTS optical/IR observations
  83. GRB 081211: Enhanced Swift-XRT position
  84. GRB 081211: Swift detection of a burst
  85. GRB081203B: optical observations
  86. GRB 081210: Enhanced Swift-XRT position
  87. GRB 081210: Swift detection of a burst with optical afterglow
  88. Konus-Wind observation of GRB 081209
  89. IPN triangulation of short hard GRB 081209
  90. GRB 081203A: optical observations
  91. GRB 081128: afterglow observations
  92. GRB 081203B: Suzaku WAM observation of the prompt emission
  93. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  94. GRB081203A: Optical observations at Ishigaki
  95. GRB 081128: Optical afterglow observations
  96. GRB 081204: GROND Observations
  97. Radio detection of GRB 081203B with the VLA
  98. GRB081203A: Radio upper limit at 15 GHz
  99. GRB 081204: Swift/UVOT Upper Limits
  100. GRB081203A: MITSuME optical observation

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