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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').
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"

32489 results found.

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

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