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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"

37755 results found.

  1. GRB 090419: Swift-BAT refined analysis
  2. VLA radio detection of GRB 090418
  3. VLA radio upper limit on GRB 090417B
  4. GRB 090419: Enhanced Swift-XRT position
  5. GRB 090418: Swift XRT refined analysis
  6. GRB 090418A: ROTSE-III Refined Analysis
  7. GRB 090419: Swift detection of a burst
  8. VLA observations of short burst GRB 090417A
  9. GRB 090418B: Detection of a bright burst from Swift-BAT slew data
  10. GRB 090417B: Gemini imaging
  11. GRB 090418: Swift-BAT refined analysis
  12. GRB 090417B: Galaxy redshift
  13. GRB 090417B: Swift-XRT refined analysis
  14. GRB 090418: Enhanced Swift-XRT position
  15. GRB 090417B: Swift-BAT further refined analysis
  16. GRB 090418: PAIRITEL NIR detection
  17. GRB 090418 Lick Redshift
  18. GRB 090418: ROTSE-III Confirmation of Optical Counterpart
  19. GRB 090418: Swift detection of a burst with optical afterglow
  20. GRB 090418 OA candidate
  21. GRB 090411B: Suzaku WAM observation of the prompt emission
  22. GRB 090411A: Suzaku WAM observation of the prompt emission
  23. GRB 090417B: Subaru NIR Observations
  24. GRB 090417B: Liverpool Telescope observations
  25. GRB 090417B: MITSuME Okayama optical upper limits
  26. GRB090417B: Xinglong TNT optical upper limit
  27. GRB 090417B: optical observations
  28. GRB090417B: optical observations
  29. GRB 090417B: Swift-BAT refined analysis
  30. GRB 090417A: Swift-BAT refined analysis
  31. GRB 090417A: Early-type nature of the putative host
  32. GRB 090417A: nearby galaxy redshift
  33. GRB 090417B: Swift detection of a burst
  34. GRB 090417: 2MASS galaxy within BAT Localization
  35. GRB 090417: Swift detection of a short burst
  36. GRB 090412: Fermi GBM detection
  37. GRB 090411B: Fermi GBM detection
  38. GRB 090411A: Fermi GBM detection
  39. GRB 090410: Suzaku WAM observation of the prompt emission
  40. GRB 090410: GROND upper limits
  41. Fermi GBM trigger 261106787 is not a GRB
  42. GRB 090410: MITSuME optical upper limits
  43. GRB 090408b: IPN Triangulation
  44. GRB 090328b: IPN Triangulation
  45. GRB 090410: Swift-BAT refined analysis
  46. GRB 090410: Swift detection of a burst
  47. Konus-Wind and Konus-RF observations of GRB 090408b
  48. GRB090408 : TAOS optical observations
  49. GRB 090409: Fermi GBM detection
  50. Swift-BAT Trigger 348781 is not a GRB
  51. Swift-BAT Trigger 348720 is not a GRB
  52. GRB 090406: pseudo-z= 0.91 from prompt emission spectrum
  53. GRB 090408: Xinglong TNT optical Upper Limit
  54. Swift-BAT trigger 348781: almost certainly not a burst
  55. Fermi GBM Detection of a weak source
  56. GRB 090408B: MASTER II-Kourovka optical observations
  57. GRB 090408: Swift detection of a burst
  58. GRB 090407: GROND upper limits
  59. GRB 090407: VLT observations
  60. GRB 090407: Swift-XRT refined analysis
  61. GRB 090407: Swift UVOT Upper Limits
  62. GRB 090407: Enhanced Swift-XRT position
  63. GRB 090407: Swift-BAT refined analysis
  64. Konus-Wind and Konus-RF observations of GRB 090406
  65. GRB 090407: ROTSE-III Optical Limits
  66. GRB 090407: Swift detection of a burst
  67. GRB 090404: millimeter detection
  68. GRB 090404: nIR observations at Calar Alto
  69. GRB 090405: Fermi GBM Detection
  70. GRB 090403: Fermi GBM detection
  71. GRB 090404: GROND upper limits
  72. GRB 090404: further NOT observations
  73. Swift/UVOT observations of GRB090404
  74. GRB 090404: NOT observations
  75. GRB 090404: optical observations at BOOTES-3 and 1.5-m OSN
  76. GRB 090404: Swift-XRT Team refined analysis
  77. GRB 090404: Xinglong TNT optical Upper Limit
  78. GRB 090404: Swift-BAT refined analysis
  79. GRB 090404: Enhanced Swift-XRT position
  80. Fermi Gamma-ray Burst Monitor trigger 260428446 is not a GRB
  81. GRB 090404: Swift detection of a burst
  82. GRB 090401A: Suzaku WAM observation of the prompt emission
  83. GRB 090401B: Suzaku WAM observation of the prompt emission
  84. Konus-Wind observation of GRB 090401B
  85. GRB 090401B: Xinglong TNT optical Upper Limit
  86. GRB 090401B: VLA radio upper limit
  87. GRB 090401B: Upper limits of MITSuME optical observation
  88. GRB 090401B: NOT optical observations
  89. GRB 090328: Fermi-LAT refined analysis
  90. GRB 090401B: AGILE refined analysis
  91. GRB 090401B: Swift XRT Refined Analysis
  92. GRB 090331: Fermi GBM detection
  93. Konus-Wind observation of GRB 090401A
  94. GRB 090401B: Enhanced Swift-XRT position
  95. AGILE Gamma-ray detection of GRB 090401B
  96. GRB 090401B: Swift-BAT refined analysis
  97. GRB 090401B: Swift detection of a burst
  98. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  99. GRB 090401, Swift-BAT refined analysis
  100. GRB 090323: Further TLS detections - a break?

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