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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"

27921 results found.

  1. GRB 090628: Swift-BAT refined analysis
  2. GRB 090628: GROND upper limits
  3. GRB 090628: Enhanced Swift-XRT position
  4. GRB 090626: IPN localization
  5. GRB 090628: Swift/UVOT Finding Chart Observation
  6. GRB 090628: Swift XRT position
  7. GRB 090628: Swift detection of a burst
  8. GRB 090625B: Swift/UVOT Upper Limits
  9. GRB 090625B: Swift-XRT refined analysis
  10. GRB 090626: Fermi GBM detection
  11. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  12. GRB 090625: Fermi GBM detection
  13. GRB 090621A: Enhanced Swift-XRT position
  14. GRB 090623: Fermi GBM detection
  15. GRB 090621B: GRT Optical Observation
  16. GRB 090621A: GRT Optical Observation
  17. PAIRITEL observations of GRB 090618
  18. GRB 090621B: Fermi GBM detection
  19. GRB 090621B: I-band observations from 1.23m CAHA
  20. GRB 090621D: Fermi GBM detection
  21. GRB 090621C: Fermi GBM detection
  22. GRB 090621: Fermi GBM observation
  23. GRB 090621B: Swift/UVOT Upper Limits
  24. GRB 090621B: Swift-BAT refined analysis
  25. GRB 090621B: Swift-XRT refined analysis
  26. GRB 090621B: RTT150 optical observations
  27. GRB 090618: RTT150 optical observations
  28. GRB 090621A: Swift-BAT refined analysis
  29. GRB 090621B: Swift detection of a short hard burst
  30. GRB 090621: Swift/UVOT Upper Limits
  31. GRB 090621: Swift-XRT Team refined analysis
  32. GRB090618: Spectrum and photometry from 6.0m BTA
  33. GRB 090621: Swift detection of a burst
  34. GRB 090618: ZTSh optical observations
  35. GRB 090618 : WSRT radio detection
  36. GRB090618, underlying supernova search
  37. GRB 090618: Fermi GBM observation
  38. GRB 090618, Swift-BAT refined spectral analysis
  39. VLA radio detection of GRB 090618
  40. GRB 090618 15GHz radio detection
  41. GRB090618 - Continued optical monitoring and light curve break
  42. GRB 090618: Swift-BAT refined analysis
  43. GRB090618: Swift-XRT team refined analysis
  44. GRB090618: Swift/UVOT bright afterglow detection
  45. GRB 090618: SDSS host detection
  46. Swift XRT observations of GRB 090531A
  47. GRB 090618: AGILE observations
  48. GRB 090617: Fermi GBM detection
  49. GRB 090618: LOAO R-band Observation
  50. GRB 090618: Enhanced Swift-XRT position
  51. GRB 090618 Faulkes Telescope North observations
  52. GRB 090618: ROTSE-III Detection of Optical Counterpart
  53. GRB090618: P60 Optical Afterglow
  54. GRB 090618: Swift detection of a bright burst with optical afterglow
  55. GRB 090616: Fermi GBM detection
  56. GRB 090612: Fermi GBM detection
  57. GRB 090610C: Fermi GBM detection
  58. GRB 090610B: Fermi GBM detection
  59. GRB 090610: Fermi GBM detection
  60. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  61. RXTE Discovery of Pulsations from SGR 0418+5729
  62. GRB 090531B: Fermi GBM detection
  63. Discovery of a new soft gamma repeater source, SGR 0418+5729
  64. GRB 090608: Fermi GBM detection
  65. GRB 090606: Fermi GBM detection
  66. GRB 090607: XRT Team Refined Analysis
  67. GRB 090607: Swift/UVOT Upper Limits
  68. GRB 090607: Swift-BAT refined analysis of the SHB
  69. GRB 090607: Faulkes Telescope North observations
  70. GRB 090607: Swift detection of a burst
  71. Ignore GCN/Swift-BAT Lightcurve Notices for trigger 353567
  72. GRB 090530: RTT150 Optical Observation
  73. GRB 090602: Fermi GBM detection
  74. GRB 090529A: RTT150 Optical Observations
  75. GRB 090531B: GROND observation
  76. GRB 090530: Early RAPTOR Optical Observations
  77. GRB 090531B: Swift/BAT spectral lag results
  78. GRB 090529C: Fermi GBM detection
  79. GRB 090529B: Fermi GBM detection
  80. GRB 090530B: Fermi GBM detection
  81. Corrections to GRB 090531B Swift/UVOT Upper Limits
  82. GRB 090531B, RIMOTS optical upper limits
  83. GRB 090531B: Swift/UVOT Upper Limits
  84. GRB 090530: GRT Optical Observation
  85. GRB 090531B: Swift-BAT refined analysis
  86. Initial Swift/UVOT observations of GRB 090531B
  87. GRB 090531B: Swift-XRT candidate afterglow position
  88. GRB 090531B: ROTSE-III Optical Limits
  89. GRB 090531B: Swift detection of a burst
  90. GRB 090531: Swift-BAT refined analysis
  91. GRB 090530: break in light curve
  92. GRB 090529: VLT spectroscopic redshift
  93. GRB 090531: GROND upper limits
  94. GRB 090531: Swift detection of a burst
  95. GRB090530: Swift XRT refined analysis
  96. GRB090530: Swift/UVOT afterglow detection
  97. GRB 090529: Swift-XRT refined analysis
  98. GRB 090528B: Fermi GBM detection
  99. GRB 090528: Fermi GBM detection
  100. GRB 090530: Enhanced Swift-XRT position

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