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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"

28123 results found.

  1. GRB051105A: Swift/UVOT Observations
  2. GRB 051105A, radio observations
  3. GRB051103:_MASTER_optical_observations
  4. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  5. GRB 051105A, optical observations
  6. XRT observations of GRB 051105A
  7. GRB 051105b: ART optical limits
  8. GRB 051105B (INTEGRAL 2701): Optical observation
  9. GRB 051105: Swift detection of a short burst
  10. Recent GRB UBVRcIc field photometry
  11. GRB051028 SARA Observation
  12. GRB051028: optical observations
  13. GRB051028: Swift/UVOT upper limits
  14. GRB051028: Swift XRT Position
  15. GRB051028:MASTER observations
  16. GRB051021B: Swift/UVOT Upper limits
  17. GRB 051021, Optical Observations
  18. GRB 051022: XRT Refined Spectral and Temporal Analysis
  19. GRB051012: Swift-XRT analysis
  20. GRB051021B: Swift XRT refined analysis
  21. GRB 051022, mm counterpart
  22. GRB 051022: Swift/UVOT Upper Limits
  23. GRB051022: Radio Counterpart
  24. GRB051022: IR observations
  25. GRB051021A: Swift XRT refined analysis
  26. GRB051022: Optical Observations
  27. GRB051021b: Magellan IR Imaging
  28. GRB 051021, SMARTS optical/IR observations
  29. GRB051022: Swift XRT Position
  30. GRB 051021: P200 Ks Observations
  31. GRB 051022 (=H3950): SXC Flight Localization is Valid
  32. GRB051021: Swift/UVOT Upper Limits
  33. GRB 051021B: Refined analysis of the Swift-BAT burst
  34. GRB 051022: SSO40 Optical Observations
  35. GRB051022,optical observation
  36. GRB 051021,optical observation
  37. GRB 051021B: Swift detection of a burst
  38. GRB 051021 : optical afterglow observation at Lulin
  39. GRB 051021: Optical observations and candidate afterglow
  40. GRB051021.63
  41. GRB051021.6: MASTER optical observation
  42. GRB051021: A GRB Localized by HETE
  43. Swift-BAT triggered on a posible CR Shower or possible GRB
  44. GRB 051016b: Optical limit
  45. Afterglow candidate of GRB 051016B observed at Lulin
  46. GRB 051016A: Swift/UVOT upper limits
  47. GRB 051016B: refined analysis of the Swift/XRT data
  48. GRB 051016B: Swift/UVOT detection
  49. GRB 051016B,optical observation
  50. GRB 051016B : Optical follow-up at Lulin
  51. GRB 051016B: Refined analysis of the Swift-BAT burst
  52. GRB 051016B: Swift detection of a soft burst
  53. GRB 051016: Swift-BAT refined analysis
  54. GRB051016 XMM-Newton observation
  55. GRB051016: Swift XRT refined analysis.
  56. GRB 051016: PROMPT Observations
  57. GRB051016: Swift detection of a burst
  58. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  59. GRB 051012: Swift-BAT detection of burst yesterday
  60. Swift-BAT Trigger 159578 is a possible burst
  61. GRB 051006: Swift/UVOT Upper Limits
  62. GRB051008: optical candidate
  63. GRB 051008 - a low redshift low-luminosity burst?
  64. GRB051011: bright nebulae near error box
  65. GRB051011: MASTER optical observation
  66. GRB051008: Final refined analysis of the Swift-BAT burst
  67. GRB051008: Radio Observation
  68. GRB 051008, optical observations
  69. GRB 051008: early Swift XRT analysis
  70. GRB 051008: Swift UVOT Candidate
  71. GRB 051006: P60 Observations
  72. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  73. GRB 051006: optical observations at Sierra Nevada
  74. GRB051006: Refined analysis of the Swift-BAT burst
  75. GRB051006: Swift detection of a burst
  76. GRB 050906, summary of radio observations
  77. GRB051001: Swift UVOT Upper Limits
  78. GRB 050925: Second Epoch WSRT Radio Observations
  79. GRB 051001: I-band limit
  80. GRB 051001: AAT infra-red observations
  81. GRB 051001: Swift-BAT refined analysis
  82. GRB 051001: Swift Detection of a Burst
  83. GRB 050820A: NIR photometry at the TNG
  84. GRB050925: Swift/XRT limits
  85. GRB/SGR 050925: IR Observations
  86. GRB 050922C: break in the lightcurve
  87. GRB050925: Swift UVOT upper limits
  88. Refined analysis of the Swift-BAT soft short burst
  89. GRB050925: Faulkes Telescope North R-band limit
  90. GRB050925: Swift-BAT detection of a short burst
  91. GRB050922C: TNG spectroscopic observations
  92. GRB050922B: refined XRT analysis
  93. GRB050922B: Swift UVOT early upper limits.
  94. GRB050922C: Optical Observations
  95. GRB 050922C: Swift XRT refined analysis
  96. HETE Fregate observations of GRB 050922C
  97. GRB 050922C: Swift-BAT refined analysis
  98. GRB 050922B: Swift-BAT refined analysis
  99. GRB 050922C: optical obserations
  100. GRB 050922C: NOT optical observations

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