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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"

23566 results found.

  1. GRB 090320C: Fermi GBM Detection
  2. GRB 090320B: Fermi GBM detection.
  3. GRB 090319: Fermi GBM detection
  4. GRB 090320A: Fermi GBM detection
  5. Further 15GHz observations of GRB090313
  6. X-shooter observations of GRB 090313
  7. GRB090313: radio detection with the VLA
  8. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  9. Further radio observation of GRB 090313
  10. Further Swift/UVOT observations of GRB 090313
  11. GRB 090313: detection with CARMA in 3mm band
  12. GRB090305B: MASTER-net prompt optical short burst observations
  13. GRB 090313: MITSuME Okayama observation
  14. GRB 090313: Additional Gemini-S photometry
  15. GRB 090313: TAROT La Silla observatory optical detection
  16. GRB 090313: Zadko Telescope observations
  17. GRB 090313 optical observations
  18. GRB 090313: Ongoing plateau phase
  19. GRB 090313: Swift-XRT refined analysis
  20. GRB 090313: Swift/UVOT upper limits
  21. GRB 090313: Sustained optical brightness (correction)
  22. GRB 090306B: Confirmation of the X-ray afterglow
  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 090205: Zadko Telescope late-time observations
  30. GRB 090309A: GROND upper limits
  31. GRB 090307A: TAROT Calern observatory optical observations
  32. GRB 090309: Swift/UVOT Upper Limits
  33. GRB090305B: Fermi GBM detection
  34. GRB 090309B: Fermi GBM detection
  35. GRB 090309: Enhanced Swift-XRT position
  36. GRB 090308: GROND observations
  37. GRB 090308: Gemini GMOS Observations
  38. GRB 090309: Swift detection of a burst
  39. GRB 090308B: Fermi GBM detection
  40. GRB 090308: Swift/UVOT Upper Limits
  41. GRB 090307B: Fermi GBM detection
  42. GRB 090306C: Fermi GBM detection
  43. GRB 090307: GROND Upper Limits
  44. GRB 090306B: GROND Upper Limits
  45. GRB 090308: Swift-XRT refined analysis
  46. GRB 090308: Swift detection of a burst
  47. GRB 090306B: Possible XRT afterglow
  48. GRB 090307: Swift-XRT afterglow confirmation and analysis
  49. Swift Trigger 345551 is probably not a GRB
  50. IPN localization of short GRB 090305C
  51. GRB 090306: Swift detection of a possible burst
  52. GRB 090305: Swift/UVOT Upper Limits
  53. GRB 090305: Swift-XRT refined analysis
  54. GRB090305: GMOS-S Candidate Optical Afterglow
  55. GRB 090305: Swift detection of a short burst
  56. GRB 090303: Fermi GBM detection
  57. GRB 090304: Fermi GBM detection
  58. Konus-RF catches first GRB and SGR bursts
  59. GRB 090228B: Fermi GBM detection
  60. IPN localization of short bright GRB 090227B
  61. GRB 090301B: Fermi GBM detection
  62. GRB 090227B: Fermi GBM detection
  63. GRB 090301: Swift detection of a burst
  64. GRB 090228: Fermi GBM detection
  65. GRB 090227: Fermi GBM detection
  66. GRB 090206: Fermi GBM detection
  67. GRB 081211B: Nearby cluster
  68. GRB 090222: Fermi GBM detection
  69. GRB 090219: Fermi GBM detection
  70. GRB090217: XRT analysis
  71. IPN localization of GRB 090217
  72. GRB 090213: Fermi GBM detection
  73. GRB 090217: Fermi GBM detection
  74. SGR activity seen by BAT during ICSP Ionospheric Events
  75. GRB 090207 - Fermi GBM Observations
  76. VLA radio upper limit on GRB 090205
  77. GRB 090205: VLT optical decay
  78. GRB 090205: Swift/UVOT Upper Limits
  79. GRB 090205: Swift-XRT refined analysis
  80. GRB 090205: GROND observations and photometric redshift estimate
  81. GRB 090205: VLT candidate afterglow
  82. GRB 090205: Swift-BAT refined analysis
  83. GRB 090205: Enhanced Swift-XRT position
  84. GRB 090205: Swift detection of a burst
  85. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  86. GRB 090202: Fermi GBM detection
  87. GRB 090131: Fermi GBM detection
  88. GRB090201: Swift UVOT upper limits
  89. GRB 090201: object inside the enhanced XRT error circle
  90. GRB 090201: Enhanced Swift-XRT position
  91. GRB 090201: VLT NIR observations
  92. GRB 090201: VLT afterglow candidate
  93. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  94. GRB 090201: ROTSE-III Optical Limits
  95. GRB 090201: Swift detection of a burst
  96. GRB 090126A: Swift/UVOT Upper Limits
  97. GRB 090129: Swift detection of a burst
  98. Suzaku ToO Observation of AXP 1E 1547.0-5408
  99. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  100. GRB 090102: HST observations and host galaxy

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