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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"

27920 results found.

  1. GRB 090628: GROND upper limits
  2. GRB 090628: Enhanced Swift-XRT position
  3. GRB 090626: IPN localization
  4. GRB 090628: Swift/UVOT Finding Chart Observation
  5. GRB 090628: Swift XRT position
  6. GRB 090628: Swift detection of a burst
  7. GRB 090625B: Swift/UVOT Upper Limits
  8. GRB 090625B: Swift-XRT refined analysis
  9. GRB 090626: Fermi GBM detection
  10. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  11. GRB 090625: Fermi GBM detection
  12. GRB 090621A: Enhanced Swift-XRT position
  13. GRB 090623: Fermi GBM detection
  14. GRB 090621B: GRT Optical Observation
  15. GRB 090621A: GRT Optical Observation
  16. PAIRITEL observations of GRB 090618
  17. GRB 090621B: Fermi GBM detection
  18. GRB 090621B: I-band observations from 1.23m CAHA
  19. GRB 090621D: Fermi GBM detection
  20. GRB 090621C: Fermi GBM detection
  21. GRB 090621: Fermi GBM observation
  22. GRB 090621B: Swift/UVOT Upper Limits
  23. GRB 090621B: Swift-BAT refined analysis
  24. GRB 090621B: Swift-XRT refined analysis
  25. GRB 090621B: RTT150 optical observations
  26. GRB 090618: RTT150 optical observations
  27. GRB 090621A: Swift-BAT refined analysis
  28. GRB 090621B: Swift detection of a short hard burst
  29. GRB 090621: Swift/UVOT Upper Limits
  30. GRB 090621: Swift-XRT Team refined analysis
  31. GRB090618: Spectrum and photometry from 6.0m BTA
  32. GRB 090621: Swift detection of a burst
  33. GRB 090618: ZTSh optical observations
  34. GRB 090618 : WSRT radio detection
  35. GRB090618, underlying supernova search
  36. GRB 090618: Fermi GBM observation
  37. GRB 090618, Swift-BAT refined spectral analysis
  38. VLA radio detection of GRB 090618
  39. GRB 090618 15GHz radio detection
  40. GRB090618 - Continued optical monitoring and light curve break
  41. GRB 090618: Swift-BAT refined analysis
  42. GRB090618: Swift-XRT team refined analysis
  43. GRB090618: Swift/UVOT bright afterglow detection
  44. GRB 090618: SDSS host detection
  45. Swift XRT observations of GRB 090531A
  46. GRB 090618: AGILE observations
  47. GRB 090617: Fermi GBM detection
  48. GRB 090618: LOAO R-band Observation
  49. GRB 090618: Enhanced Swift-XRT position
  50. GRB 090618 Faulkes Telescope North observations
  51. GRB 090618: ROTSE-III Detection of Optical Counterpart
  52. GRB090618: P60 Optical Afterglow
  53. GRB 090618: Swift detection of a bright burst with optical afterglow
  54. GRB 090616: Fermi GBM detection
  55. GRB 090612: Fermi GBM detection
  56. GRB 090610C: Fermi GBM detection
  57. GRB 090610B: Fermi GBM detection
  58. GRB 090610: Fermi GBM detection
  59. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  60. RXTE Discovery of Pulsations from SGR 0418+5729
  61. GRB 090531B: Fermi GBM detection
  62. Discovery of a new soft gamma repeater source, SGR 0418+5729
  63. GRB 090608: Fermi GBM detection
  64. GRB 090606: Fermi GBM detection
  65. GRB 090607: XRT Team Refined Analysis
  66. GRB 090607: Swift/UVOT Upper Limits
  67. GRB 090607: Swift-BAT refined analysis of the SHB
  68. GRB 090607: Faulkes Telescope North observations
  69. GRB 090607: Swift detection of a burst
  70. Ignore GCN/Swift-BAT Lightcurve Notices for trigger 353567
  71. GRB 090530: RTT150 Optical Observation
  72. GRB 090602: Fermi GBM detection
  73. GRB 090529A: RTT150 Optical Observations
  74. GRB 090531B: GROND observation
  75. GRB 090530: Early RAPTOR Optical Observations
  76. GRB 090531B: Swift/BAT spectral lag results
  77. GRB 090529C: Fermi GBM detection
  78. GRB 090529B: Fermi GBM detection
  79. GRB 090530B: Fermi GBM detection
  80. Corrections to GRB 090531B Swift/UVOT Upper Limits
  81. GRB 090531B, RIMOTS optical upper limits
  82. GRB 090531B: Swift/UVOT Upper Limits
  83. GRB 090530: GRT Optical Observation
  84. GRB 090531B: Swift-BAT refined analysis
  85. Initial Swift/UVOT observations of GRB 090531B
  86. GRB 090531B: Swift-XRT candidate afterglow position
  87. GRB 090531B: ROTSE-III Optical Limits
  88. GRB 090531B: Swift detection of a burst
  89. GRB 090531: Swift-BAT refined analysis
  90. GRB 090530: break in light curve
  91. GRB 090529: VLT spectroscopic redshift
  92. GRB 090531: GROND upper limits
  93. GRB 090531: Swift detection of a burst
  94. GRB090530: Swift XRT refined analysis
  95. GRB090530: Swift/UVOT afterglow detection
  96. GRB 090529: Swift-XRT refined analysis
  97. GRB 090528B: Fermi GBM detection
  98. GRB 090528: Fermi GBM detection
  99. GRB 090530: Enhanced Swift-XRT position
  100. Strong radio emission from SN 2007bg one year after the explosion - detection of spreading, off-axis GRB jet?

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