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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"

37769 results found.

  1. GRB 090618: RTT150 optical observations
  2. GRB 090628: Swift/UVOT Upper Limits
  3. Konus-Wind observation of GRB 090626
  4. GRB080628: SAO RAS optical observations
  5. GRB 090628: Swift-BAT refined analysis
  6. GRB 090628: GROND upper limits
  7. GRB 090628: Enhanced Swift-XRT position
  8. GRB 090628: 1.23m CAHA optical observations
  9. GRB 090626: IPN localization
  10. GRB 090628: Swift/UVOT Finding Chart Observation
  11. GRB 090628: Swift XRT position
  12. GRB 090628: Swift detection of a burst
  13. Fermi LAT observations of GRB 090626
  14. GRB 090625B: Fermi GBM observation
  15. GRB 090423: Spitzer observations of the z~8.3 burst
  16. GRB 090625B: Swift/UVOT Upper Limits
  17. GRB 090625B: Swift-XRT refined analysis
  18. GRB 090626: Fermi GBM detection
  19. GRB 090625B: GROND upper limits
  20. GRB 090623: Suzaku WAM observation of the prompt emission
  21. GRB090618: HCT optical observations
  22. GRB 090618: SARA Second Epoch Observations
  23. GRB 090625B: Faulkes Telescope South observations
  24. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  25. GRB 090625B: a long GRB localized by INTEGRAL
  26. GRB 090625: Fermi GBM detection
  27. GRB 090618: Correction to GCN 9568
  28. GRB 090617: Suzaku WAM observation of the prompt emission
  29. GRB 090618: Suzaku WAM observation of the prompt emission
  30. GRB 090621A: Enhanced Swift-XRT position
  31. GRB 090623: Fermi GBM detection
  32. GRB 090621B: GRT Optical Observation
  33. GRB 090621A: GRT Optical Observation
  34. PAIRITEL observations of GRB 090618
  35. GRB 090621B: Fermi GBM detection
  36. GRB 090621B: I-band observations from 1.23m CAHA
  37. GRB 090621D: Fermi GBM detection
  38. GRB 090621B: Gemini spectrum of afterglow candidate
  39. GRB 090621C: Fermi GBM detection
  40. GRB 090621B: P60 Observations
  41. GRB 090621: Fermi GBM observation
  42. GRB 090621B: VLA observations
  43. GRB 090620: Fermi GBM detecion
  44. Konus-Wind and Konus-RF observations of GRB 090618
  45. GRB 090621B: Swift/UVOT Upper Limits
  46. GRB 090621B: Swift-BAT refined analysis
  47. GRB 090621B: Swift-XRT refined analysis
  48. GRB 090621B: RTT150 optical observations
  49. GRB 090618: RTT150 optical observations
  50. GRB 090621B: Optical Observations
  51. GRB 090621A: Swift-BAT refined analysis
  52. GRB 090621B: Swift detection of a short hard burst
  53. GRB 090621: Swift/UVOT Upper Limits
  54. GRB 090621: Swift-XRT Team refined analysis
  55. GRB 090618: BOAO V-band Observation
  56. GRB 090621: Swift detection of a burst
  57. GRB 090618: ZTSh optical observations
  58. GRB 090618 : WSRT radio detection
  59. GRB090618, underlying supernova search
  60. GRB 090618: Fermi GBM observation
  61. GRB 090618, Swift-BAT refined spectral analysis
  62. VLA radio detection of GRB 090618
  63. GRB 090618 15GHz radio detection
  64. GRB 090618: Swift-BAT refined analysis
  65. GRB 090618: SARA observations
  66. GRB090618: Swift-XRT team refined analysis
  67. GRB090618: Swift/UVOT bright afterglow detection
  68. GRB 090618: SDSS host detection
  69. Swift XRT observations of GRB 090531A
  70. GRB 090618: AGILE observations
  71. GRB 090617: Fermi GBM detection
  72. GRB 090618: LOAO R-band Observation
  73. GRB 090618: Enhanced Swift-XRT position
  74. GRB 090618 Faulkes Telescope North observations
  75. Optical observations of GRB 090618
  76. GRB 090618: Lick/KAST Spectroscopy
  77. GRB 090618: OA behavior from KAIT
  78. GRB 090618: planned XMM-Newton observation
  79. GRB 090618: ROTSE-III Detection of Optical Counterpart
  80. GRB 090618: KAIT optical afterglow
  81. GRB 090618: Swift detection of a bright burst with optical afterglow
  82. GRB 090616: Fermi GBM detection
  83. GRB 090612: Fermi GBM detection
  84. GRB 090610C: Fermi GBM detection
  85. GRB 090610B: Fermi GBM detection
  86. GRB 090610: Fermi GBM detection
  87. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  88. GRB 090602: Suzaku WAM observation of the prompt emission
  89. GRB 090424: WSRT Radio Observations
  90. GRB 090423: WSRT Radio Observations
  91. RXTE Discovery of Pulsations from SGR 0418+5729
  92. GRB 090531B: Fermi GBM detection
  93. Discovery of a new soft gamma repeater source, SGR 0418+5729
  94. GRB 090608: Fermi GBM detection
  95. GRB 090606: Fermi GBM detection
  96. GRB 090607: XRT Team Refined Analysis
  97. GRB 090607: Swift/UVOT Upper Limits
  98. GRB 090607: Swift-BAT refined analysis of the SHB
  99. GRB 090607: GRAS001 optical observations
  100. GRB 090607: Faulkes Telescope North observations

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