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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"

37705 results found.

  1. GRB 121117A: Swift-XRT refined Analysis
  2. GRB 121117A: MASTER prompt optical limit
  3. GRB 121117A, Swift-BAT refined analysis
  4. GRB 121117A: ROTSE-III Optical Limits
  5. GRB 121117A: BOOTES-3 early optical upper limit
  6. GRB 121117A: Swift detection of a burst
  7. Fermi GBM trigger 121115.186 is not a GRB
  8. GRB 121108A: Swift-XRT refined Analysis
  9. GRB 121108A: Swift/UVOT Upper Limits
  10. GRB 121108A, Swift-BAT refined analysis
  11. GRB 121108A: Xinglong TNT upper limit
  12. GRB 121108A: Enhanced Swift-XRT position
  13. GRB 121108A : Lulin/TRIPOL2 Optical Limits
  14. GRB 121108A: Optical observations
  15. GRB 121108A: MITSuME Ishigakijima upper limits
  16. GRB 121108A: Weihai observatory optical observations
  17. GRB 121108A: MASTER early prompt optical limit
  18. GRB 121108A: TAROT Calern observatory optical observations
  19. GRB 121108A: Swift detection of a burst
  20. GRB 121031A: Fermi GBM detection
  21. GRB 121028A: Swift/UVOT Upper Limits
  22. GRB 121031A, Early peak observed with Swift-BAT
  23. GRB 121102A: Swift/UVOT Upper Limits
  24. GRB 121031A: Swift/UVOT Upper Limits
  25. GRB 121031A: Swift-XRT refined Analysis
  26. GRB 121102A: Enhanced Swift-XRT position
  27. GRB 121031A: Enhanced Swift-XRT position
  28. GRB 121102A: Swift-XRT refined Analysis
  29. GRB 121102A: Swift-BAT refined analysis
  30. GRB 121025A: Confirmation of the X-ray afterglow
  31. GRB 121029A Suzaku WAM observation of the prompt emission
  32. GRB 121102A : a long GRB detected by INTEGRAL
  33. GRB 121102A: Swift detection of a burst
  34. GRB 121027A: sub-mm upper limit
  35. GRB 121031A: Swift-BAT refined analysis
  36. GRB 121031A: Prompt enhanced Swift-XRT position
  37. GRB 121031A: Swift detection of a burst
  38. GRB 121027A: Swift/UVOT Possible Detection
  39. GRB 121024A: LOAO RIzY Observation
  40. GRB 121027A: X-shooter redshift confirmation
  41. GRB 121027A - Gemini South spectroscopy
  42. GRB 121024A: SMARTS optical/IR afterglow observations
  43. GRB 121028A: near-IR observations at Calar Alto
  44. GRB 121027A: GROND Confirmation of Rebrightening
  45. GRB 121029A: Fermi GBM detection
  46. GRB 121028A: RAPTOR Limits During Gamma-Ray Emitting Interval
  47. GRB 121027A: MASTER early prompt optical limit
  48. GRB 121027A: Swift-XRT refined Analysis
  49. GRB 121027A: Brightening IR counterpart
  50. GRB 121028A: Swift-XRT refined Analysis
  51. GRB 121028A: Enhanced Swift-XRT position
  52. GRB 121028A: Swift-BAT refined analysis
  53. GRB 121027A: Enhanced Swift-XRT position
  54. GRB 121028A: MITSuME Okayama Optical upper limits
  55. GRB 121028A: Faulkes Telescope North observations
  56. GRB 121028A: Swift detection of a burst
  57. GRB 121011A: optical observations
  58. GRB 121027A: nIR afterglow candidate with AAT
  59. GRB 121027A: Swift-BAT refined analysis
  60. GRB 121025A: Swift-XRT observation
  61. GRB 121027A: MAXI/GSC detection 40 minutes after the Swift Trigger
  62. GRB 121027A: Swift detection of a burst
  63. GRB 121024A: optical observations
  64. GRB 121024A: EVLA Detection
  65. GRB 121024A: Swift/UVOT Observations
  66. GRB 121024A: CARMA 3mm Detection
  67. GRB 121024A: Swift-BAT refined analysis
  68. GRB 121024A: GMG optical observation
  69. GRB 121024A: MITSuME Ishigakijima upper limits
  70. GRB 121024A: MITSuME Okayama Optical upper limits
  71. GRB 121025A: MAXI/GSC detection
  72. GRB 121024A: Enhanced Swift-XRT position
  73. GRB 121024A: PAIRITEL NIR Detection
  74. GRB 121024A: Swift-XRT refined Analysis
  75. GRB 121024A: GROND Detection of the Optical/NIR Afterglow
  76. GRB 121024A: VLT/X-shooter redshift
  77. GRB 121024A: BOOTES-1B optical detection
  78. GRB 121024A: TAROT Calern observatory optical detection of a bright counterpart
  79. GRB 121024A: Swift detection of a burst with an optical counterpart
  80. GRB 121011A: early optical light curve
  81. GRB 121017A: Swift/UVOT Upper Limits
  82. GRB 121017A: Swift-XRT refined Analysis
  83. GRB 121017A: GROND Observations
  84. GRB 121017A: Swift-BAT refined analysis
  85. GRB 121017A: Enhanced Swift-XRT position
  86. GRB 121017A: 1.23m CAHA R-band observations
  87. GRB 121017A optical observations
  88. GRB 121017A: BOOTES-2/TELMA observations
  89. GRB 121017A: Swift detection of a burst
  90. GRB 121011B: Suzaku WAM observation of the prompt emission
  91. GRB 121011A Suzaku WAM observation of the prompt emission
  92. GRB 121012A: Fermi GBM detection
  93. PdB IRAM observation of GRB 121011A
  94. Konus-Wind observation of GRB 121011B
  95. GRB 121014A: Swift-BAT refined analysis
  96. GRB 121011A: WSRT radio observation
  97. GRB 121014A: Swift detection of a burst
  98. INTEGRAL Alert n.6678: NOT A GRB
  99. GRB 121011A: optical observations
  100. GRB 121011A: Swift/UVOT Detection

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