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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"

32702 results found.

  1. GRB 090417B: Galaxy redshift
  2. GRB 090417B: Swift-XRT refined analysis
  3. GRB 090417B: Swift-BAT further refined analysis
  4. GRB 090418: PAIRITEL NIR detection
  5. GRB 090418 Lick Redshift
  6. GRB 090418: ROTSE-III Confirmation of Optical Counterpart
  7. GRB 090411B: Suzaku WAM observation of the prompt emission
  8. GRB 090411A: Suzaku WAM observation of the prompt emission
  9. GRB 090417B: Subaru NIR Observations
  10. GRB 090417B: Liverpool Telescope observations
  11. GRB 090417B: MITSuME Okayama optical upper limits
  12. GRB090417B: Xinglong TNT optical upper limit
  13. GRB 090417B: optical observations
  14. GRB090417B: optical observations
  15. GRB 090417B: Swift-BAT refined analysis
  16. GRB 090417A: Swift-BAT refined analysis
  17. GRB 090417A: Early-type nature of the putative host
  18. GRB 090417A: nearby galaxy redshift
  19. GRB 090417: 2MASS galaxy within BAT Localization
  20. GRB 090410: Suzaku WAM observation of the prompt emission
  21. GRB 090410: GROND upper limits
  22. GRB 090410: MITSuME optical upper limits
  23. GRB 090408b: IPN Triangulation
  24. GRB 090328b: IPN Triangulation
  25. GRB 090410: Swift-BAT refined analysis
  26. GRB090408, RIMOTS optical upper limits
  27. GRB 090408: Xinglong TNT optical Upper Limit
  28. GRB 090408B: MASTER II-Kourovka optical observations
  29. GRB 090407: GROND upper limits
  30. GRB 090407: VLT observations
  31. GRB 090407: Swift-XRT refined analysis
  32. GRB 090407: Swift UVOT Upper Limits
  33. GRB 090407: Swift-BAT refined analysis
  34. GRB 090407: ROTSE-III Optical Limits
  35. GRB 090404: GROND upper limits
  36. GRB 090404: further NOT observations
  37. Swift/UVOT observations of GRB090404
  38. GRB 090404: NOT observations
  39. GRB 090404: Swift-XRT Team refined analysis
  40. GRB 090404: Xinglong TNT optical Upper Limit
  41. GRB 090404: Swift-BAT refined analysis
  42. GRB 090401A: Suzaku WAM observation of the prompt emission
  43. GRB 090401B: Suzaku WAM observation of the prompt emission
  44. Konus-Wind observation of GRB 090401B
  45. GRB 090401B: Xinglong TNT optical Upper Limit
  46. GRB 090401B: VLA radio upper limit
  47. GRB 090401B: Upper limits of MITSuME optical observation
  48. GRB090401B, RIMOTS optical upper limits
  49. GRB 090401B: NOT optical observations
  50. GRB 090328: Fermi-LAT refined analysis
  51. Swift/UVOT observations of GRB090401B
  52. GRB 090401B: AGILE refined analysis
  53. Swift/UVOT observations of GRB090401B
  54. GRB 090401B: Swift XRT Refined Analysis
  55. Konus-Wind observation of GRB 090401A
  56. AGILE Gamma-ray detection of GRB 090401B
  57. GRB 090401B: Swift-BAT refined analysis
  58. Swift/UVOT detection of GRB090401B
  59. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  60. GRB 090401, Swift-BAT refined analysis
  61. GRB 090323: Further TLS detections - a break?
  62. GRB 090324: Suzaku WAM observation of the prompt emission
  63. GRB 090328: Radio afterglow detection
  64. GRB 090328: BOOTES-3 optical observations
  65. GRB 090328: Fermi GBM Spectral Analysis
  66. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  67. GRB 090328: Gemini South Redshift
  68. GRB 090328: Swift XRT refined analysis
  69. GRB090323: Optical observations from NOT
  70. Konus-Wind observation of GRB 090328
  71. GRB 090328: IPN Triangulation
  72. GRB 090328: Swift UVOT observations
  73. GRB 090323: WSRT Radio Detection
  74. GRB 090328: Possible Swift/XRT detection
  75. GRB 090323: Radio afterglow detection
  76. GRB 090323: Additional Lick observations
  77. GRB 090323: TLS detection at 5 days, no break
  78. GRB 090323: Faulkes Telescope South Observations
  79. GRB 090320B: MASTER-Net prompt optical observations
  80. GRB 090323: RTT150 optical observations
  81. GRB 090323: Lick observations
  82. GRB 090323: Fermi GBM Spectral Analysis
  83. GRB 090323: Optical observation of xinglong TNT
  84. GRB 090323 TLS detection - still bright
  85. GRB 090323: UVOT Detection of Afterglow
  86. GRB 090323: Swift-XRT refined analysis
  87. Konus-Wind observation of GRB 090323
  88. GRB 090323 Gemini-South Redshift
  89. GRB 090323: P60 Afterglow Confirmation
  90. GRB 090323: GROND Detection of the Afterglow and Photo-z
  91. SGR J1550-5418: two Fermi GBM triggers on March 22
  92. GRB 090323: Possible XRT Counterpart
  93. IPN triangulation of GRB090323
  94. Further 15GHz observations of GRB090313
  95. GRB 090313: WSRT Radio Detection
  96. X-shooter observations of GRB 090313
  97. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  98. GRB 090315: Suzaku WAM observation of the prompt emission
  99. GRB 090313: VLT spectroscopy
  100. GRB090313: radio detection with the VLA

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