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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"

28115 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 090118: Possible burst detection from Swift-BAT slew data
  6. GRB 090117B : Fermi GBM detection
  7. GRB 090117C - Fermi GRB Detection
  8. GRB 090117 - Fermi GBM Observations
  9. GRB 090117: GROND Upper Limits
  10. GRB090117 Swift/UVOT upper limits
  11. GRB090117: Swift-XRT detection of a possible candidate afterglow
  12. GRB 090117 - SuperAGILE Localization of a long GRB
  13. GRB 090112B: Suzaku WAM observation of the prompt emission
  14. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  15. GRB 090113: Swift UVOT upper limits
  16. GRB 090113: GROND Upper Limits
  17. GRB 090113: Swift-XRT refined analysis
  18. GRB 090113: Observations from NOT
  19. GRB 090113: Enhanced Swift-XRT position
  20. GRB 090113: Swift-BAT refined analysis
  21. GRB 090113: ROTSE-III Optical Limits
  22. GRB 090112B: Fermi GBM Detection
  23. GRB 090113: Swift detection of a burst
  24. GRB 090112: Fermi GBM detection
  25. GRB 090109: Fermi GBM detection
  26. GRB 090108B: Fermi GBM detection
  27. GRB 090111, Swift-BAT refined analysis
  28. GRB 090111: Swift UVOT Upper Limits
  29. GRB 090108: Fermi GBM Detection
  30. GRB 090111: Swift-XRT refined analysis
  31. GRB 090111: Enhanced Swift-XRT position
  32. GRB 090111: Swift detection of a burst
  33. GRB 090107B: Suzaku WAM observation of the prompt emission
  34. GRB090107B: Fermi GBM Detection
  35. GRB 090107B: Swift XRT afterglow confirmation
  36. GRB 090107B: Swift/UVOT Observations
  37. GRB 090107B: Swift-XRT detection of possible afterglow
  38. GRB 090107B: a long GRB localized by INTEGRAL
  39. Fermi/GBM detection of GRB 081226A
  40. Fermi/GBM detection of GRB 081225
  41. GRB 090107: Swift-BAT refined analysis
  42. GRB 081231: Fermi GBM Detection
  43. VLA radio upper limit on GRB 090102
  44. GRB 090102: GRT Optical Observation
  45. Swift triggered on the HMXB 1A 1118-61
  46. GRB 081229: Fermi GBM detection
  47. GRB 090102: P60 Imaging and P200 Spectroscopy
  48. GRB 090102 Observations from IAC80
  49. GRB 090102: GROND observations of the optical afterglow
  50. GRB 090102: Swift-BAT refined analysis
  51. GRB 090102: Swift XRT refined analysis
  52. GRB 090102: NOT redshift
  53. GRB 090102: Enhanced Swift-XRT position
  54. GRB 090102: REM observations of a bright afterglow
  55. GRB 090102: Swift detection of a burst with an optical counterpart
  56. GRB 090102: TAROT Calern observatory optical observations
  57. GRB 081230: GROND confirmation of the afterglow
  58. GRB 081230, Swift-BAT refined analysis
  59. GRB081230: Swift-XRT refined analysis
  60. GRB 081230 Swift/UVOT Observations
  61. GRB 081230: Enhanced Swift-XRT position
  62. GRB 081230: ROTSE-III Detection of Optical Counterpart
  63. GRB 081230: Swift detection of a burst
  64. GRB 081226C: Fermi GBM detection
  65. GRB 081228, Swift-BAT refined analysis
  66. VLA radio detection of GRB 081221
  67. GRB 081228: Swift/UVOT Upper Limits
  68. GRB 081228: Swift-XRT Team refined analysis
  69. GRB 081228: detection by GROND
  70. GRB 081228: Enhanced Swift-XRT position
  71. GRB 081228: TAROT Calern observatory optical observations
  72. GRB 081228: Swift detection of a burst
  73. VLA radio observation of GRB 081221
  74. GRB 081226B: Swift XRT and UVOT upper limits
  75. GRB 081224: Suzaku WAM observation of the prompt emission
  76. GRB 081226: Swift-XRT refined analysis
  77. GRB 081226A: Swift UVOT Upper Limits
  78. GRB 081226A: Swift-BAT refined analysis
  79. GRB 081226: GROND afterglow candidate
  80. GRB 081226: ROTSE-III Optical Limits
  81. GRB 081226: Swift detection of a possible short-hard burst
  82. GRB 080810: optical observations
  83. GRB 081211B: optical observations
  84. GRB 081224: Swift-XRT observation
  85. GRB 081222: MITSuME optical observation
  86. GRB 081224: Fermi GBM Detection & LAT Localization
  87. GRB 080810: optical observations
  88. Konus-Wind observation of GRB 081222
  89. GRB 081223: Fermi GBM detection
  90. GRB 081221: GROND observations
  91. VLA radio upper limit on GRB 081222
  92. GRB 081222: Fermi GBM observation
  93. GRB 081221: Probable host galaxy in Keck imaging
  94. GRB 081204C: Fermi GBM detection
  95. GRB 081222, Swift-BAT refined analysis
  96. GRB 081221, Swift-BAT refined analysis
  97. GRB081222 optical limit by "Pi of the Sky"
  98. GRB 081222: Swift XRT refined analysis
  99. GRB081221: Fermi GBM observation
  100. IPN triangulation of bright GRB 081215A

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