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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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').
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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"

32494 results found.

  1. GRB 090417B: Subaru NIR Observations
  2. GRB 090417B: Liverpool Telescope observations
  3. GRB 090417B: MITSuME Okayama optical upper limits
  4. GRB090417B: Xinglong TNT optical upper limit
  5. GRB 090417B: optical observations
  6. GRB090417B: optical observations
  7. GRB 090417B: Swift-BAT refined analysis
  8. GRB 090417A: Swift-BAT refined analysis
  9. GRB 090417A: Early-type nature of the putative host
  10. GRB 090417A: nearby galaxy redshift
  11. GRB 090417: 2MASS galaxy within BAT Localization
  12. GRB 090410: Suzaku WAM observation of the prompt emission
  13. GRB 090410: GROND upper limits
  14. GRB 090410: MITSuME optical upper limits
  15. GRB 090408b: IPN Triangulation
  16. GRB 090328b: IPN Triangulation
  17. GRB 090410: Swift-BAT refined analysis
  18. GRB090408, RIMOTS optical upper limits
  19. GRB 090408: Xinglong TNT optical Upper Limit
  20. GRB 090408B: MASTER II-Kourovka optical observations
  21. GRB 090407: GROND upper limits
  22. GRB 090407: VLT observations
  23. GRB 090407: Swift-XRT refined analysis
  24. GRB 090407: Swift UVOT Upper Limits
  25. GRB 090407: Swift-BAT refined analysis
  26. GRB 090407: ROTSE-III Optical Limits
  27. GRB 090404: GROND upper limits
  28. GRB 090404: further NOT observations
  29. Swift/UVOT observations of GRB090404
  30. GRB 090404: NOT observations
  31. GRB 090404: Swift-XRT Team refined analysis
  32. GRB 090404: Xinglong TNT optical Upper Limit
  33. GRB 090404: Swift-BAT refined analysis
  34. GRB 090401A: Suzaku WAM observation of the prompt emission
  35. GRB 090401B: Suzaku WAM observation of the prompt emission
  36. Konus-Wind observation of GRB 090401B
  37. GRB 090401B: Xinglong TNT optical Upper Limit
  38. GRB 090401B: VLA radio upper limit
  39. GRB 090401B: Upper limits of MITSuME optical observation
  40. GRB090401B, RIMOTS optical upper limits
  41. GRB 090401B: NOT optical observations
  42. GRB 090328: Fermi-LAT refined analysis
  43. Swift/UVOT observations of GRB090401B
  44. GRB 090401B: AGILE refined analysis
  45. Swift/UVOT observations of GRB090401B
  46. GRB 090401B: Swift XRT Refined Analysis
  47. Konus-Wind observation of GRB 090401A
  48. AGILE Gamma-ray detection of GRB 090401B
  49. GRB 090401B: Swift-BAT refined analysis
  50. Swift/UVOT detection of GRB090401B
  51. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  52. GRB 090401, Swift-BAT refined analysis
  53. GRB 090323: Further TLS detections - a break?
  54. GRB 090324: Suzaku WAM observation of the prompt emission
  55. GRB 090328: Radio afterglow detection
  56. GRB 090328: BOOTES-3 optical observations
  57. GRB 090328: Fermi GBM Spectral Analysis
  58. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  59. GRB 090328: Gemini South Redshift
  60. GRB 090328: Swift XRT refined analysis
  61. GRB090323: Optical observations from NOT
  62. Konus-Wind observation of GRB 090328
  63. GRB 090328: IPN Triangulation
  64. GRB 090328: Swift UVOT observations
  65. GRB 090323: WSRT Radio Detection
  66. GRB 090328: Possible Swift/XRT detection
  67. GRB 090323: Radio afterglow detection
  68. GRB 090323: Additional Lick observations
  69. GRB 090323: TLS detection at 5 days, no break
  70. GRB 090323: Faulkes Telescope South Observations
  71. GRB 090320B: MASTER-Net prompt optical observations
  72. GRB 090323: RTT150 optical observations
  73. GRB 090323: Lick observations
  74. GRB 090323: Fermi GBM Spectral Analysis
  75. GRB 090323: Optical observation of xinglong TNT
  76. GRB 090323 TLS detection - still bright
  77. GRB 090323: UVOT Detection of Afterglow
  78. GRB 090323: Swift-XRT refined analysis
  79. Konus-Wind observation of GRB 090323
  80. GRB 090323 Gemini-South Redshift
  81. GRB 090323: P60 Afterglow Confirmation
  82. GRB 090323: GROND Detection of the Afterglow and Photo-z
  83. SGR J1550-5418: two Fermi GBM triggers on March 22
  84. GRB 090323: Possible XRT Counterpart
  85. IPN triangulation of GRB090323
  86. Further 15GHz observations of GRB090313
  87. GRB 090313: WSRT Radio Detection
  88. X-shooter observations of GRB 090313
  89. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  90. GRB 090315: Suzaku WAM observation of the prompt emission
  91. GRB 090313: VLT spectroscopy
  92. GRB090313: radio detection with the VLA
  93. Konus-Wind observation of GRB 090315
  94. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  95. GRB 090313, SMARTS optical/IR observations
  96. Further Swift/UVOT observations of GRB 090313
  97. GRB 090313: detection with CARMA in 3mm band
  98. GRB090305B: MASTER-net prompt optical short burst observations
  99. Radio detection of GRB090313
  100. GRB 090313: MITSuME Okayama observation

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