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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"

32707 results found.

  1. GRB 090418: Swift XRT refined analysis
  2. GRB 090418A: ROTSE-III Refined Analysis
  3. VLA observations of short burst GRB 090417A
  4. GRB 090417B: Gemini imaging
  5. GRB 090418: Swift-BAT refined analysis
  6. GRB 090417B: Galaxy redshift
  7. GRB 090417B: Swift-XRT refined analysis
  8. GRB 090417B: Swift-BAT further refined analysis
  9. GRB 090418: PAIRITEL NIR detection
  10. GRB 090418 Lick Redshift
  11. GRB 090418: ROTSE-III Confirmation of Optical Counterpart
  12. GRB 090411B: Suzaku WAM observation of the prompt emission
  13. GRB 090411A: Suzaku WAM observation of the prompt emission
  14. GRB 090417B: Subaru NIR Observations
  15. GRB 090417B: Liverpool Telescope observations
  16. GRB 090417B: MITSuME Okayama optical upper limits
  17. GRB090417B: Xinglong TNT optical upper limit
  18. GRB 090417B: optical observations
  19. GRB090417B: optical observations
  20. GRB 090417B: Swift-BAT refined analysis
  21. GRB 090417A: Swift-BAT refined analysis
  22. GRB 090417A: Early-type nature of the putative host
  23. GRB 090417A: nearby galaxy redshift
  24. GRB 090417: 2MASS galaxy within BAT Localization
  25. GRB 090410: Suzaku WAM observation of the prompt emission
  26. GRB 090410: GROND upper limits
  27. GRB 090410: MITSuME optical upper limits
  28. GRB 090408b: IPN Triangulation
  29. GRB 090328b: IPN Triangulation
  30. GRB 090410: Swift-BAT refined analysis
  31. GRB090408, RIMOTS optical upper limits
  32. GRB 090408: Xinglong TNT optical Upper Limit
  33. GRB 090408B: MASTER II-Kourovka optical observations
  34. GRB 090407: GROND upper limits
  35. GRB 090407: VLT observations
  36. GRB 090407: Swift-XRT refined analysis
  37. GRB 090407: Swift UVOT Upper Limits
  38. GRB 090407: Swift-BAT refined analysis
  39. GRB 090407: ROTSE-III Optical Limits
  40. GRB 090404: GROND upper limits
  41. GRB 090404: further NOT observations
  42. Swift/UVOT observations of GRB090404
  43. GRB 090404: NOT observations
  44. GRB 090404: Swift-XRT Team refined analysis
  45. GRB 090404: Xinglong TNT optical Upper Limit
  46. GRB 090404: Swift-BAT refined analysis
  47. GRB 090401A: Suzaku WAM observation of the prompt emission
  48. GRB 090401B: Suzaku WAM observation of the prompt emission
  49. Konus-Wind observation of GRB 090401B
  50. GRB 090401B: Xinglong TNT optical Upper Limit
  51. GRB 090401B: VLA radio upper limit
  52. GRB 090401B: Upper limits of MITSuME optical observation
  53. GRB090401B, RIMOTS optical upper limits
  54. GRB 090401B: NOT optical observations
  55. GRB 090328: Fermi-LAT refined analysis
  56. Swift/UVOT observations of GRB090401B
  57. GRB 090401B: AGILE refined analysis
  58. Swift/UVOT observations of GRB090401B
  59. GRB 090401B: Swift XRT Refined Analysis
  60. Konus-Wind observation of GRB 090401A
  61. AGILE Gamma-ray detection of GRB 090401B
  62. GRB 090401B: Swift-BAT refined analysis
  63. Swift/UVOT detection of GRB090401B
  64. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  65. GRB 090401, Swift-BAT refined analysis
  66. GRB 090323: Further TLS detections - a break?
  67. GRB 090324: Suzaku WAM observation of the prompt emission
  68. GRB 090328: Radio afterglow detection
  69. GRB 090328: BOOTES-3 optical observations
  70. GRB 090328: Fermi GBM Spectral Analysis
  71. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  72. GRB 090328: Gemini South Redshift
  73. GRB 090328: Swift XRT refined analysis
  74. GRB090323: Optical observations from NOT
  75. Konus-Wind observation of GRB 090328
  76. GRB 090328: IPN Triangulation
  77. GRB 090328: Swift UVOT observations
  78. GRB 090323: WSRT Radio Detection
  79. GRB 090328: Possible Swift/XRT detection
  80. GRB 090323: Radio afterglow detection
  81. GRB 090323: Additional Lick observations
  82. GRB 090323: TLS detection at 5 days, no break
  83. GRB 090323: Faulkes Telescope South Observations
  84. GRB 090320B: MASTER-Net prompt optical observations
  85. GRB 090323: RTT150 optical observations
  86. GRB 090323: Lick observations
  87. GRB 090323: Fermi GBM Spectral Analysis
  88. GRB 090323: Optical observation of xinglong TNT
  89. GRB 090323 TLS detection - still bright
  90. GRB 090323: UVOT Detection of Afterglow
  91. GRB 090323: Swift-XRT refined analysis
  92. Konus-Wind observation of GRB 090323
  93. GRB 090323 Gemini-South Redshift
  94. GRB 090323: P60 Afterglow Confirmation
  95. GRB 090323: GROND Detection of the Afterglow and Photo-z
  96. SGR J1550-5418: two Fermi GBM triggers on March 22
  97. GRB 090323: Possible XRT Counterpart
  98. IPN triangulation of GRB090323
  99. Further 15GHz observations of GRB090313
  100. GRB 090313: WSRT Radio Detection

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