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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"

27938 results found.

  1. GRB 090323: Possible XRT Counterpart
  2. GRB 090320C: Fermi GBM Detection
  3. GRB 090320B: Fermi GBM detection.
  4. GRB 090319: Fermi GBM detection
  5. GRB 090320A: Fermi GBM detection
  6. GRB 090313: WSRT Radio Detection
  7. X-shooter observations of GRB 090313
  8. GRB 090313: VLT spectroscopy
  9. GRB090313: radio detection with the VLA
  10. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  11. Further Swift/UVOT observations of GRB 090313
  12. GRB 090313: detection with CARMA in 3mm band
  13. Radio detection of GRB090313
  14. GRB 090313: TAROT La Silla observatory optical detection
  15. GRB 090313: Zadko Telescope observations
  16. GRB 090313 - PAIRITEL NIR detections
  17. GRB 090313 optical observations
  18. GRB 090313: Swift-XRT refined analysis
  19. GRB 090313: Swift/UVOT upper limits
  20. GRB 090313: Faulkes Telescope North observations
  21. GRB 090306B: Confirmation of the X-ray afterglow
  22. GRB 090313: Swift-BAT refined analysis
  23. GRB 090313, GROND observations
  24. GRB 090309, Swift-BAT lag analysis
  25. GRB 090313: Swift detection of a burst
  26. GRB 090313: Swift detection of a burst
  27. Swift trigger 346250 is probably not a burst
  28. GRB090310: Fermi GBM detection
  29. GRB 090309A: GROND upper limits
  30. GRB 090307A: TAROT Calern observatory optical observations
  31. GRB 090309: Swift/UVOT Upper Limits
  32. GRB090305B: Fermi GBM detection
  33. GRB 090309B: Fermi GBM detection
  34. GRB 090309: Swift-XRT refined analysis
  35. GRB 090309: Enhanced Swift-XRT position
  36. GRB 090306B: INTEGRAL SPI-ACS light curve
  37. GRB 090309, Swift-BAT refined analysis
  38. GRB 090308: GROND observations
  39. GRB 090308: Gemini GMOS Observations
  40. GRB 090309: Swift detection of a burst
  41. GRB 090308B: Fermi GBM detection
  42. GRB 090308: Swift/UVOT Upper Limits
  43. GRB 090307B: Fermi GBM detection
  44. GRB 090306C: Fermi GBM detection
  45. GRB 090307: GROND Upper Limits
  46. GRB 090306B: GROND Upper Limits
  47. GRB 090305C: Suzaku WAM observation of the prompt emission
  48. GRB 090308: Swift-XRT refined analysis
  49. Radio observation of GRB 081007 with ATCA
  50. ATCA observation of SGR J1550-5418
  51. GRB 090308: Swift-BAT refined analysis
  52. GRB 090308: Swift detection of a burst
  53. GRB 090306B: Possible XRT afterglow
  54. GRB 090307: Swift-XRT afterglow confirmation and analysis
  55. GRB 090307: Swift-BAT refined analysis of trigger 345551
  56. GRB 090306B: Burst detection from Swift-BAT slew data
  57. Swift Trigger 345551 is probably not a GRB
  58. Swift-BAT trigger 345396 is not a GRB
  59. IPN localization of short GRB 090305C
  60. GRB 090306: Swift detection of a possible burst
  61. GRB 090305: Swift/UVOT Upper Limits
  62. GRB 090305: Swift-XRT refined analysis
  63. GRB 090305, Swift-BAT refined analysis
  64. GRB 090305: Swift detection of a short burst
  65. GRB 090303: Fermi GBM detection
  66. GRB 090304: Fermi GBM detection
  67. GRB 090301A: Suzaku WAM observation of the prompt emission
  68. GRB 090228B: Fermi GBM detection
  69. Konus-Wind observation of GRB 090301A
  70. GRB 090301A: Swift-BAT refined analysis
  71. GRB 090301B: Fermi GBM detection
  72. GRB 090227B: Fermi GBM detection
  73. GRB 090301: Swift detection of a burst
  74. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  75. GRB 090228: Fermi GBM detection
  76. GRB 090227: Fermi GBM detection
  77. GRB 090206: Fermi GBM detection
  78. SGR J1550-5418
  79. GRB 081211B: Nearby cluster
  80. GRB 090222: Fermi GBM detection
  81. GRB 090219: Fermi GBM detection
  82. Swift Restored
  83. Swift Trigger 343319 is not a GRB
  84. GRB 090217: Suzaku WAM observation of the prompt emission
  85. GRB090217: XRT analysis
  86. GRB 090213: Fermi GBM detection
  87. GRB090217: Fermi-LAT Detection
  88. GRB 090217: Fermi GBM detection
  89. SGR activity seen by BAT during ICSP Ionospheric Events
  90. GRB 090129: Fermi GBM detection
  91. GRB 090205: Swift/UVOT Upper Limits
  92. GRB 090205: Swift-XRT refined analysis
  93. GRB 090205: Swift burst of interest
  94. GRB 090205: GROND observations and photometric redshift estimate
  95. GRB 090205: Swift-BAT refined analysis
  96. GRB 090205: Enhanced Swift-XRT position
  97. GRB 090205: Swift detection of a burst
  98. GRB 090126A: Swift-XRT afterglow confirmation
  99. Konus-Wind observation of GRB 090201
  100. GRB 090202: Fermi GBM detection

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Download all Circulars as a .tar.gz archive (updated once a day):
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