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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"

19608 results found.

  1. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  2. GRB 090709A: Swift XRT Refined Analysis
  3. GRB 090709B, Swift-BAT refined analysis
  4. GRB 090709A: Swift-BAT refined analysis
  5. GRB090709A: High Energy BAT/XRT Analysis Suggests Low to Moderate Redshift
  6. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  7. GRB 090709A, RIMOTS optical upper limits
  8. GRB 090709A: Enhanced Swift-XRT position
  9. GRB 090709B: Swift detection of a burst
  10. GRB 090708 : Fermi GBM detection
  11. GRB 090709: Faulkes Telescope North Upper Limits
  12. GRB 090709: PAIRITEL NIR Upper Limits
  13. GRB 090709: ROTSE-III Optical Limits
  14. GRB 090709: Swift detection of a bright burst
  15. GRB 090708: Early RAPTOR Optical Limits
  16. GRB 090708, Swift-BAT refined analysis
  17. GRB 090708: ROTSE-III Optical Limits
  18. GRB 090708: Swift detection of a burst
  19. Swift-BAT trigger 356516 is not a GRB
  20. Possible GRB090705: Swift-XRT observations
  21. GRB 090705: PAIRITEL NIR Observations
  22. GRB 090705: Swift detection of a possible burst
  23. XRF 090702 : RTT150 optical observations
  24. GRB 090618: Mondy optical observations
  25. GRB 090529: CrAO optical upper limit
  26. GRB 090529: MTM-500 optical observations
  27. GRB 090529: Mt.Terskol optical observations
  28. XRF 090702: Swift-XRT refined analysis
  29. GRB 090702: UVOT upper limits
  30. XRF 090702: Swift-XRT afterglow position
  31. GRB 090628: Swift XRT refined analysis
  32. GRB 090618: RTT150 optical observations
  33. GRB 090628: Swift/UVOT Upper Limits
  34. GRB 090628: Swift-BAT refined analysis
  35. GRB 090628: GROND upper limits
  36. GRB 090628: Enhanced Swift-XRT position
  37. GRB 090626: IPN localization
  38. GRB 090628: Swift/UVOT Finding Chart Observation
  39. GRB 090628: Swift XRT position
  40. GRB 090628: Swift detection of a burst
  41. GRB 090625B: Swift/UVOT Upper Limits
  42. GRB 090625B: Swift-XRT refined analysis
  43. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  44. GRB 090621A: Enhanced Swift-XRT position
  45. GRB 090621B: GRT Optical Observation
  46. GRB 090621A: GRT Optical Observation
  47. PAIRITEL observations of GRB 090618
  48. GRB 090621B: Fermi GBM detection
  49. GRB 090621B: I-band observations from 1.23m CAHA
  50. GRB 090621: Fermi GBM observation
  51. GRB 090621B: Swift/UVOT Upper Limits
  52. GRB 090621B: Swift-BAT refined analysis
  53. GRB 090621B: Swift-XRT refined analysis
  54. GRB 090621B: RTT150 optical observations
  55. GRB 090618: RTT150 optical observations
  56. GRB 090621A: Swift-BAT refined analysis
  57. GRB 090621B: Swift detection of a short hard burst
  58. GRB 090621: Swift/UVOT Upper Limits
  59. GRB 090621: Swift-XRT Team refined analysis
  60. GRB 090621: Swift detection of a burst
  61. GRB 090618: ZTSh optical observations
  62. GRB090618, underlying supernova search
  63. GRB 090618: Fermi GBM observation
  64. GRB 090618, Swift-BAT refined spectral analysis
  65. GRB090618 - Continued optical monitoring and light curve break
  66. GRB 090618: Swift-BAT refined analysis
  67. GRB090618: Swift-XRT team refined analysis
  68. GRB090618: Swift/UVOT bright afterglow detection
  69. Swift XRT observations of GRB 090531A
  70. GRB 090618: AGILE observations
  71. GRB 090618: Enhanced Swift-XRT position
  72. GRB 090618 Faulkes Telescope North observations
  73. GRB 090618: ROTSE-III Detection of Optical Counterpart
  74. GRB090618: P60 Optical Afterglow
  75. GRB 090618: Swift detection of a bright burst with optical afterglow
  76. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  77. RXTE Discovery of Pulsations from SGR 0418+5729
  78. GRB 090531B: Fermi GBM detection
  79. Discovery of a new soft gamma repeater source, SGR 0418+5729
  80. GRB 090607: XRT Team Refined Analysis
  81. GRB 090607: Swift/UVOT Upper Limits
  82. GRB 090607: Swift-BAT refined analysis of the SHB
  83. GRB 090607: Faulkes Telescope North observations
  84. GRB 090607: Swift detection of a burst
  85. Ignore GCN/Swift-BAT Lightcurve Notices for trigger 353567
  86. GRB 090530: RTT150 Optical Observation
  87. GRB 090529A: RTT150 Optical Observations
  88. GRB 090531B: GROND observation
  89. GRB 090530: Early RAPTOR Optical Observations
  90. GRB 090531B: Swift/BAT spectral lag results
  91. Corrections to GRB 090531B Swift/UVOT Upper Limits
  92. GRB 090531B, RIMOTS optical upper limits
  93. GRB 090531B: Swift/UVOT Upper Limits
  94. GRB 090530: GRT Optical Observation
  95. GRB 090531B: Swift-BAT refined analysis
  96. Initial Swift/UVOT observations of GRB 090531B
  97. GRB 090531B: Swift-XRT candidate afterglow position
  98. GRB 090531B: ROTSE-III Optical Limits
  99. GRB 090531B: Swift detection of a burst
  100. GRB 090531: Swift-BAT refined analysis

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