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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"

32769 results found.

  1. GRB 090407: ROTSE-III Optical Limits
  2. GRB 090404: GROND upper limits
  3. GRB 090404: further NOT observations
  4. Swift/UVOT observations of GRB090404
  5. GRB 090404: NOT observations
  6. GRB 090404: Swift-XRT Team refined analysis
  7. GRB 090404: Xinglong TNT optical Upper Limit
  8. GRB 090404: Swift-BAT refined analysis
  9. GRB 090401A: Suzaku WAM observation of the prompt emission
  10. GRB 090401B: Suzaku WAM observation of the prompt emission
  11. Konus-Wind observation of GRB 090401B
  12. GRB 090401B: Xinglong TNT optical Upper Limit
  13. GRB 090401B: VLA radio upper limit
  14. GRB 090401B: Upper limits of MITSuME optical observation
  15. GRB090401B, RIMOTS optical upper limits
  16. GRB 090401B: NOT optical observations
  17. GRB 090328: Fermi-LAT refined analysis
  18. Swift/UVOT observations of GRB090401B
  19. GRB 090401B: AGILE refined analysis
  20. Swift/UVOT observations of GRB090401B
  21. GRB 090401B: Swift XRT Refined Analysis
  22. Konus-Wind observation of GRB 090401A
  23. AGILE Gamma-ray detection of GRB 090401B
  24. GRB 090401B: Swift-BAT refined analysis
  25. Swift/UVOT detection of GRB090401B
  26. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  27. GRB 090401, Swift-BAT refined analysis
  28. GRB 090323: Further TLS detections - a break?
  29. GRB 090324: Suzaku WAM observation of the prompt emission
  30. GRB 090328: Radio afterglow detection
  31. GRB 090328: BOOTES-3 optical observations
  32. GRB 090328: Fermi GBM Spectral Analysis
  33. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  34. GRB 090328: Gemini South Redshift
  35. GRB 090328: Swift XRT refined analysis
  36. GRB090323: Optical observations from NOT
  37. Konus-Wind observation of GRB 090328
  38. GRB 090328: IPN Triangulation
  39. GRB 090328: Swift UVOT observations
  40. GRB 090323: WSRT Radio Detection
  41. GRB 090328: Possible Swift/XRT detection
  42. GRB 090323: Radio afterglow detection
  43. GRB 090323: Additional Lick observations
  44. GRB 090323: TLS detection at 5 days, no break
  45. GRB 090323: Faulkes Telescope South Observations
  46. GRB 090320B: MASTER-Net prompt optical observations
  47. GRB 090323: RTT150 optical observations
  48. GRB 090323: Lick observations
  49. GRB 090323: Fermi GBM Spectral Analysis
  50. GRB 090323: Optical observation of xinglong TNT
  51. GRB 090323 TLS detection - still bright
  52. GRB 090323: UVOT Detection of Afterglow
  53. GRB 090323: Swift-XRT refined analysis
  54. Konus-Wind observation of GRB 090323
  55. GRB 090323 Gemini-South Redshift
  56. GRB 090323: P60 Afterglow Confirmation
  57. GRB 090323: GROND Detection of the Afterglow and Photo-z
  58. SGR J1550-5418: two Fermi GBM triggers on March 22
  59. GRB 090323: Possible XRT Counterpart
  60. IPN triangulation of GRB090323
  61. Further 15GHz observations of GRB090313
  62. GRB 090313: WSRT Radio Detection
  63. X-shooter observations of GRB 090313
  64. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  65. GRB 090315: Suzaku WAM observation of the prompt emission
  66. GRB 090313: VLT spectroscopy
  67. GRB090313: radio detection with the VLA
  68. Konus-Wind observation of GRB 090315
  69. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  70. GRB 090313, SMARTS optical/IR observations
  71. Further Swift/UVOT observations of GRB 090313
  72. GRB 090313: detection with CARMA in 3mm band
  73. GRB090305B: MASTER-net prompt optical short burst observations
  74. Radio detection of GRB090313
  75. GRB 090313: MITSuME Okayama observation
  76. GRB 090313: Additional Gemini-S photometry
  77. GRB 090313: WSRT Radio Observations
  78. GRB 090313: Gemini-S photometry
  79. GRB 090313: Zadko Telescope observations
  80. GRB 090313 - PAIRITEL NIR detections
  81. GRB 090313: Gemini-S redshift
  82. GRB 090313 optical observations
  83. GRB 090313: Ongoing plateau phase
  84. GRB 090313: Swift-XRT refined analysis
  85. GRB 090313: Swift/UVOT upper limits
  86. GRB 090313: Faulkes Telescope North observations
  87. GRB 090313: Sustained optical brightness (correction)
  88. GRB 090306B: Confirmation of the X-ray afterglow
  89. GRB 090313: Swift-BAT refined analysis
  90. GRB 090313: Sustained optical brightness
  91. GRB 090313: SDSS object underlying the optical afterglow position
  92. GRB 090313, GROND observations
  93. GRB 090309, Swift-BAT lag analysis
  94. GRB 090205: Zadko Telescope late-time observations
  95. GRB 090309A: GROND upper limits
  96. GRB 090309: Swift/UVOT Upper Limits
  97. GRB 090309: Swift-XRT refined analysis
  98. GRB 090306B: INTEGRAL SPI-ACS light curve
  99. GRB 090309, Swift-BAT refined analysis
  100. GRB 090308: GROND observations

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