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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"

32684 results found.

  1. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  2. GRB 090118: Swift-XRT observations
  3. GRB090118 Swift/UVOT upper limits
  4. GRB 090118: GROND Upper Limits
  5. GRB 090117: confirmation of the X-ray afterglow
  6. GRB 090117 - Fermi GBM Observations
  7. GRB 090117: GROND Upper Limits
  8. GRB090117 Swift/UVOT upper limits
  9. GRB 090112B: Suzaku WAM observation of the prompt emission
  10. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  11. GRB 090113: Swift UVOT upper limits
  12. GRB 090113: GROND Upper Limits
  13. GRB 090113: Swift-XRT refined analysis
  14. GRB 090113: Observations from NOT
  15. GRB 090113: Swift-BAT refined analysis
  16. GRB 090113: ROTSE-III Optical Limits
  17. GRB090113: XRT position
  18. GRB 090111, Swift-BAT refined analysis
  19. GRB 090111: Swift UVOT Upper Limits
  20. GRB 090111: Swift-XRT refined analysis
  21. GRB 090107B: Suzaku WAM observation of the prompt emission
  22. GRB090107B: Fermi GBM Detection
  23. GRB 090102: WSRT Radio Observations
  24. GRB 090107B: Swift XRT afterglow confirmation
  25. GRB 090107B: Swift/UVOT Observations
  26. GRB 090107B: Swift-XRT detection of possible afterglow
  27. GRB 090107B optical observations
  28. GRB 090107B: ROTSE-III Optical Limits
  29. Fermi/GBM detection of GRB 081226A
  30. GRB 090107: Swift-BAT refined analysis
  31. GRB 090102: optical decay
  32. VLA radio upper limit on GRB 090102
  33. GRB 090102: GRT Optical Observation
  34. Konus-Wind observation of GRB 090102
  35. GRB 090102: Hobby-Eberly Telescope Spectroscopy
  36. GRB 090102: P60 Imaging and P200 Spectroscopy
  37. GRB 090102 Observations from IAC80
  38. GRB 090102: GROND observations of the optical afterglow
  39. Swift UVOT observations of GRB 090102
  40. GRB 090102: Swift-BAT refined analysis
  41. GRB 090102: Swift XRT refined analysis
  42. GRB 090102: NOT redshift
  43. GRB 090102: TAROT Calern observatory optical light curve
  44. GRB 090102: REM observations of a bright afterglow
  45. GRB 081230: GROND confirmation of the afterglow
  46. GRB 081230, Swift-BAT refined analysis
  47. GRB081230: Swift-XRT refined analysis
  48. GRB 081230 Swift/UVOT Observations
  49. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  50. GRB 081230: ROTSE-III Detection of Optical Counterpart
  51. GRB 081228: GROND confirmation of the optical/NIR afterglow
  52. GRB 081226B: Fermi GBM observation
  53. GRB 081228, Swift-BAT refined analysis
  54. VLA radio detection of GRB 081221
  55. GRB 081228: Swift/UVOT Upper Limits
  56. GRB 081228: Swift-XRT Team refined analysis
  57. GRB 081228: detection by GROND
  58. VLA radio observation of GRB 081221
  59. GRB 081226B: Swift XRT and UVOT upper limits
  60. GRB 081224: Suzaku WAM observation of the prompt emission
  61. GRB 081226: Swift-XRT refined analysis
  62. GRB 081226A: Swift UVOT Upper Limits
  63. GRB 081226: Second epoch of Gemini-South imaging
  64. GRB 081226A: Swift-BAT refined analysis
  65. GRB 081226: Gemini-South imaging
  66. GRB 081226: GROND afterglow candidate
  67. GRB 081226: ROTSE-III Optical Limits
  68. GRB 080810: optical observations
  69. GRB 081211B: optical observations
  70. GRB081224: LAT retraction
  71. GRB 081224: Swift-XRT observation
  72. GRB 081222: MITSuME optical observation
  73. GRB 080810: optical observations
  74. Konus-Wind observation of GRB 081222
  75. GRB 081221: GROND observations
  76. GRB 081222: Gemini-N confirmation of redshift z=2.77
  77. GRB 081222:Optical afterglow observation
  78. VLA radio upper limit on GRB 081222
  79. GRB 081222: Fermi GBM observation
  80. GRB 081222: Gemini-South absorption redshift
  81. GRB081222: Swift/UVOT further observations
  82. GRB 081221: Probable host galaxy in Keck imaging
  83. GRB 081222, Swift-BAT refined analysis
  84. GRB 081221, Swift-BAT refined analysis
  85. Konus-Wind observation of very bright GRB 081215A
  86. GRB 081222: Swift XRT refined analysis
  87. GRB081221: Fermi GBM observation
  88. Swift/UVOT observations of GRB 081221
  89. IPN triangulation of bright GRB 081215A
  90. GRB 081221: Swift-XRT Refined Analysis
  91. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  92. GRB 081222: Faulkes Telescope South observations
  93. GRB 081221: Gemini-N nIR imaging
  94. GRB081222, optical observation
  95. GRB081222: Swift/UVOT detection of an optical afterglow
  96. GRB081203A: BTA observation
  97. Konus-Wind observation of GRB 081221
  98. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  99. GRB 081221: further NOT observations
  100. GRB 081221: NOT observations

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