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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"

18461 results found.

  1. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  2. GRB 090709A, RIMOTS optical upper limits
  3. GRB 090709A: Enhanced Swift-XRT position
  4. GRB 090709A: Subaru NIR observation
  5. GRB 090709 : planned Suzaku-ToO observation
  6. GRB 090709: Faulkes Telescope North Upper Limits
  7. GRB 090709: PAIRITEL NIR Upper Limits
  8. GRB 090709: Swift detection of a bright burst
  9. GRB 090708: Early RAPTOR Optical Limits
  10. GRB 090708, Swift-BAT refined analysis
  11. GRB 090705: PAIRITEL NIR Observations
  12. GRB 090705: Swift detection of a possible burst
  13. XRF 090702 : RTT150 optical observations
  14. GRB 090529: CrAO optical upper limit
  15. GRB 090529: MTM-500 optical observations
  16. GRB 090703: Fermi GBM detection
  17. GRB 090702: UVOT upper limits
  18. GRB 090313: optical observations
  19. XRF 090702: VLT imaging
  20. XRF 090702: Swift-XRT afterglow position
  21. GRB 090404: Deep optical imaging and possible host association
  22. GRB 090628: Swift/UVOT Upper Limits
  23. GRB080628: SAO RAS optical observations
  24. GRB 090628: GROND upper limits
  25. GRB 090628: Enhanced Swift-XRT position
  26. GRB 090626: IPN localization
  27. GRB 090423: Spitzer observations of the z~8.3 burst
  28. GRB 090625B: Swift/UVOT Upper Limits
  29. GRB 090625B: GROND upper limits
  30. GRB090618: HCT optical observations
  31. GRB 090618: SARA Second Epoch Observations
  32. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  33. GRB 090621A: Enhanced Swift-XRT position
  34. GRB 090621B: GRT Optical Observation
  35. GRB 090621A: GRT Optical Observation
  36. GRB 090621B: I-band observations from 1.23m CAHA
  37. GRB 090621B: P60 Observations
  38. GRB 090621B: VLA observations
  39. GRB 090621B: Swift/UVOT Upper Limits
  40. GRB 090621B: RTT150 optical observations
  41. GRB 090621B: Swift detection of a short hard burst
  42. GRB 090621: Swift/UVOT Upper Limits
  43. GRB090618: Spectrum and photometry from 6.0m BTA
  44. GRB 090621: Swift detection of a burst
  45. GRB090618: OAA-OAUV Optical observations
  46. VLA radio detection of GRB 090618
  47. GRB 090618 15GHz radio detection
  48. GRB090618 - Continued optical monitoring and light curve break
  49. GRB 090618: SARA observations
  50. GRB090618: Swift-XRT team refined analysis
  51. GRB090618: Swift/UVOT bright afterglow detection
  52. GRB 090618: SDSS host detection
  53. Swift XRT observations of GRB 090531A
  54. GRB 090618: AGILE observations
  55. GRB 090618: Enhanced Swift-XRT position
  56. GRB 090618 Faulkes Telescope North observations
  57. GRB090618: P60 Optical Afterglow
  58. GRB 090618: Swift detection of a bright burst with optical afterglow
  59. RXTE Discovery of Pulsations from SGR 0418+5729
  60. GRB 090607: Swift/UVOT Upper Limits
  61. GRB 090607: GRAS001 optical observations
  62. GRB 090607: Faulkes Telescope North observations
  63. GRB 090607: Swift detection of a burst
  64. GRB 090530: Further NOT optical observations
  65. GRB 090530: RTT150 Optical Observation
  66. GRB 090529A: RTT150 Optical Observations
  67. GMRT observation of GRB 090424 afterglow
  68. GRB090529: Further NOT optical observations
  69. GRB 090531B: GROND observation
  70. GRB 090530: Early RAPTOR Optical Observations
  71. GRB090529B: ROVOR Upper Limits
  72. GRB 090531A: SARA upper limit
  73. GRB 090531B: Swift/BAT spectral lag results
  74. Corrections to GRB 090531B Swift/UVOT Upper Limits
  75. GRB 090531B, RIMOTS optical upper limits
  76. GRB 090531B: Swift/UVOT Upper Limits
  77. GRB 090529: MITSuME optical observation
  78. GRB 090530: GRT Optical Observation
  79. GRB 090531B: Swift-XRT candidate afterglow position
  80. GRB 090531B: ROTSE-III Optical Limits
  81. GRB 090531: Swift-BAT refined analysis
  82. GRB090530: R-band Observation
  83. GRB 090530: break in light curve
  84. GRB 090531: GROND upper limits
  85. GRB 090531: P60 Observations
  86. GRB 090529: NOT optical observations
  87. GRB 090530: NOT optical observations
  88. GRB090530: Swift XRT refined analysis
  89. GRB090530: Swift/UVOT afterglow detection
  90. GRB 090529: Swift-XRT refined analysis
  91. GRB 090530: Enhanced Swift-XRT position
  92. GRB 090530: GRAS002 refined OA analysis
  93. GRB 090530: GRAS002 optical observations
  94. GRB 090530: PAIRITEL NIR Detections
  95. GRB 090530: Swift detection of a burst with an optical counterpart
  96. GRB090529: UVOT/Swift detection of a brightening optical afterglow
  97. GRB 090529: Swift-BAT refined analysis
  98. GRB 090529: Enhanced Swift-XRT position
  99. GRB 090529: Preliminary Swift/UVOT Upper Limit
  100. GRB 090529: Swift detection of a burst

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