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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"

38679 results found.

  1. IBAS Alert 2700: Not a GRB
  2. GRB 051016B host spectroscopy and redshift
  3. GRB051016B: optical observation
  4. Recent GRB UBVRcIc field photometry
  5. Konus-Wind observation of GRB 051028
  6. GRB051028:MASTER correction and final results
  7. GRB 051022: RTT150 optical observations
  8. GRB051028 SARA Observation
  9. GRB051028: optical observations
  10. GRB051028: Swift/UVOT upper limits
  11. GRB051028: Swift XRT Position
  12. GRB051028:MASTER observations
  13. GRB 051028 (=H3951): A GRB localized by HETE
  14. GRB051022: Swift XRT measurement of jet break
  15. SGR 1806-20: continued moderate activity seen with INTEGRAL
  16. GRB051021B: Swift/UVOT Upper limits
  17. GRB 051021, Optical Observations
  18. GRB 051022: XRT Refined Spectral and Temporal Analysis
  19. GRB 051022, refined optical astrometry
  20. Chandra Observations of GRB 051022
  21. GRB051012: Swift-XRT analysis
  22. GRB 051022 Chandra Observations scheduled
  23. GRB051021B: Swift XRT refined analysis
  24. GRB051021a: optical observations
  25. GRB 051022: WSRT Radio Detection
  26. GRB 051022, mm counterpart
  27. GRB051022: host galaxy redshift
  28. GRB 051022: Swift/UVOT Upper Limits
  29. GRB051022: Radio Counterpart
  30. GRB 051022: SOAR JKs Observations
  31. GRB051021A: Swift XRT refined analysis
  32. Konus-Wind observation of GRB 051022
  33. GRB051022: Optical Observations
  34. GRB 051022: Magellan NIR imaging
  35. GRB 051021: PROMPT RcIc Observations
  36. GRB051021b: Magellan IR Imaging
  37. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  38. GRB 051021: Correction
  39. GRB 051022, J & K-band observation
  40. GRB 051021, SMARTS optical/IR observations
  41. GRB051022: Swift XRT Position
  42. GRB 051021: P200 Ks Observations
  43. IPN triangulation of GRB051022 (=H3950)
  44. GRB 051021: MDM Upper Limit
  45. GRB 051022 (=H3950): SXC Flight Localization is Valid
  46. GRB051021: Swift/UVOT Upper Limits
  47. GRB 051021B: Refined analysis of the Swift-BAT burst
  48. GRB 051022: SSO40 Optical Observations
  49. GRB051022,optical observation
  50. GRB 051022A: ROTSE-III Optical Limits
  51. GRB051022 (=H3590), A GRB Detected By HETE
  52. GRB 051022: Optical observations
  53. GRB 051021,optical observation
  54. GRB051021B: Swift XRT Position
  55. GRB 051021: SOAR NIR Observations
  56. GRB 051021B: Swift detection of a burst
  57. GRB051021: Swift XRT analysis
  58. GRB051021 (=H3947): Refined Analysis
  59. GRB 051021 : optical afterglow observation at Lulin
  60. GRB 051021: Optical observations
  61. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  62. GRB 051021: Optical observations and candidate afterglow
  63. Swift-BAT trigger 160640 is not a real GRB
  64. GRB051021: A GRB Localized by HETE
  65. Swift-BAT trigger 160619 is not a GRB
  66. Swift-BAT triggered on a posible CR Shower or possible GRB
  67. GRB 050502b: Optical limit
  68. GRB 051016b: Optical limit
  69. Afterglow candidate of GRB 051016B observed at Lulin
  70. GRB 051016b: Gemini Near IR Observations
  71. GRB 051016A: Swift/UVOT upper limits
  72. GRB 051016B: refined analysis of the Swift/XRT data
  73. GRB 051016B: Swift/UVOT detection
  74. GRB 051016B,optical observation
  75. GRB 051016B : Optical follow-up at Lulin
  76. GRB 051016B: Refined analysis of the Swift-BAT burst
  77. GRB 051016B: Swift detection of a soft burst
  78. GRB 051016: Swift-BAT refined analysis
  79. GRB051016 XMM-Newton observation
  80. GRB051016: Swift XRT refined analysis.
  81. GRB051016: Planned XMM-Newton observation
  82. GRB 051016: LCO optical and near-IR imaging
  83. GRB 051016: PROMPT Observations
  84. GRB051016: Swift detection of a burst
  85. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  86. GRB051006: optical observations
  87. GRB 051012: Swift-BAT detection of burst yesterday
  88. Swift trigger 159578 is not a burst
  89. Swift-BAT Trigger 159578 is a possible burst
  90. GRB 051006: Swift/UVOT Upper Limits
  91. IBAS Alert 2675 : not a GRB
  92. GRB051008: optical candidate
  93. GRB 051008 - a low redshift low-luminosity burst?
  94. IBAS Alert 2673: not a real GRB
  95. GRB051011: bright nebulae near error box
  96. GRB051008: optical observation
  97. GRB051008: Swift XRT refined analysis
  98. Konus-Wind observation of GRB 051008
  99. GRB051008: Final refined analysis of the Swift-BAT burst
  100. GRB 051008: R-band upper limit

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