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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

18468 results found.

  1. GRB 090423: GROND detection and preliminary photo-z
  2. GRB 090423: NOT z-band limit
  3. GRB 090423: Correction to NIR photometry
  4. GRB090418A Rc-band photometry
  5. GRB 090423: NIR photometry and evidence for spectral break
  6. GRB090423, RIMOTS optical upper limits
  7. GRB 090423: Enhanced Swift-XRT position
  8. GRB 090422: Swift/UVOT Upper Limits
  9. GRB 090423: UKIRT K-band observations
  10. GRB 090423: P60 Observations
  11. GRB 090418A: R and I band observation
  12. GRB 090423: Swift detection of a burst
  13. GRB 090422: Enhanced Swift-XRT position
  14. GRB 090418B: RTT150 optical observations
  15. GRB 080410: GAO 150cm telescope Optical Observation
  16. GRB 080408A: GAO 150cm telescope Optical Observation
  17. GRB 090422: Swift detection of a burst
  18. GRB 090418B: GRAS002 observatios
  19. GRB 090418B: GROND observations
  20. GRB 090419: Swift/UVOT Observations
  21. GRB 090418B: Faulkes Telescope North observations
  22. GRB 090418A: Swift/UVOT Observations
  23. GRB 090417B: Swift/UVOT Upper Limits
  24. GRB 090419: GROND detection of afterglow candidate
  25. GRB 090418: Optical observations with MITSuME Okayama and Ishigaki 1m telescope
  26. VLA radio detection of GRB 090418
  27. VLA radio upper limit on GRB 090417B
  28. GRB 090419: Enhanced Swift-XRT position
  29. GRB 090419: Swift detection of a burst
  30. VLA observations of short burst GRB 090417A
  31. GRB 090418B: Detection of a bright burst from Swift-BAT slew data
  32. GRB 090417B: Gemini imaging
  33. GRB 090417B: Swift-XRT refined analysis
  34. GRB 090418: Enhanced Swift-XRT position
  35. GRB 090418: Swift detection of a burst with optical afterglow
  36. GRB 090417B: Subaru NIR Observations
  37. GRB 090417B: MITSuME Okayama optical upper limits
  38. GRB 090417B: optical observations
  39. GRB090417B: optical observations
  40. GRB 090417B: Swift detection of a burst
  41. GRB 090410: GROND upper limits
  42. GRB 090410: MITSuME optical upper limits
  43. GRB 090408b: IPN Triangulation
  44. GRB 090328b: IPN Triangulation
  45. GRB090408, RIMOTS optical upper limits
  46. Swift-BAT trigger 348781: almost certainly not a burst
  47. GRB 090408B: MASTER II-Kourovka optical observations
  48. GRB 090407: GROND upper limits
  49. GRB 090407: VLT observations
  50. GRB 090407: Swift UVOT Upper Limits
  51. GRB 090407: Enhanced Swift-XRT position
  52. GRB 090407: ROTSE-III Optical Limits
  53. GRB 090407: Swift detection of a burst
  54. GRB 090404: nIR observations at Calar Alto
  55. GRB 090404: GROND upper limits
  56. GRB 090404: further NOT observations
  57. Swift/UVOT observations of GRB090404
  58. GRB 090404: NOT observations
  59. GRB 090404: Enhanced Swift-XRT position
  60. GRB 090404: Swift detection of a burst
  61. GRB 090401B: Suzaku WAM observation of the prompt emission
  62. GRB 090401B: Xinglong TNT optical Upper Limit
  63. GRB 090401B: VLA radio upper limit
  64. GRB 090401B: Upper limits of MITSuME optical observation
  65. GRB090401B, RIMOTS optical upper limits
  66. GRB 090401B: Enhanced Swift-XRT position
  67. AGILE Gamma-ray detection of GRB 090401B
  68. GRB 090401B: Swift detection of a burst
  69. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  70. GRB 090323: Further TLS detections - a break?
  71. GRB 090328: Radio afterglow detection
  72. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  73. GRB090323: Optical observations from NOT
  74. GRB 090328: Swift UVOT observations
  75. GRB 090328: Updated position/optical afterglow candidate
  76. GRB 090323: Radio afterglow detection
  77. GRB 090320B: MASTER-Net prompt optical observations
  78. GRB 090323: UVOT Detection of Afterglow
  79. GRB 090323: P60 Afterglow Confirmation
  80. GRB 090323: GROND Detection of the Afterglow and Photo-z
  81. GRB 090323: Possible XRT Counterpart
  82. Further 15GHz observations of GRB090313
  83. X-shooter observations of GRB 090313
  84. GRB090313: radio detection with the VLA
  85. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  86. Further radio observation of GRB 090313
  87. GRB 090313: detection with CARMA in 3mm band
  88. GRB090305B: MASTER-net prompt optical short burst observations
  89. GRB 090313: MITSuME Okayama observation
  90. GRB 090313: Additional Gemini-S photometry
  91. GRB 090313: TAROT La Silla observatory optical detection
  92. GRB 090313: Zadko Telescope observations
  93. GRB 090313: Ongoing plateau phase
  94. GRB 090313: Swift-XRT refined analysis
  95. GRB 090313: Swift/UVOT upper limits
  96. GRB 090313, GROND observations
  97. Swift trigger 346250 is probably not a burst
  98. GRB 090205: Zadko Telescope late-time observations
  99. GRB 090309A: GROND upper limits
  100. GRB 090307A: TAROT Calern observatory optical observations

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