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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"

37938 results found.

  1. GRB051016B: optical observation
  2. Recent GRB UBVRcIc field photometry
  3. Konus-Wind observation of GRB 051028
  4. GRB051028:MASTER correction and final results
  5. GRB 051022: RTT150 optical observations
  6. GRB 051021A: RTT150 optical observations
  7. GRB051028 SARA Observation
  8. GRB051028: optical observations
  9. GRB051028: Swift/UVOT upper limits
  10. GRB051028: confirmation of the afterglow
  11. GRB051028: WHT optical candidate
  12. GRB051028: Swift XRT Position
  13. GRB051028:MASTER observations
  14. GRB 051028 (=H3951): A GRB localized by HETE
  15. GRB051028:MASTER optical observations
  16. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  17. GRB051022: Swift XRT measurement of jet break
  18. GRB051021B: Swift/UVOT Upper limits
  19. GRB 051021, Optical Observations
  20. GRB 051022: XRT Refined Spectral and Temporal Analysis
  21. GRB 051022, refined optical astrometry
  22. Chandra Observations of GRB 051022
  23. GRB051012: Swift-XRT analysis
  24. GRB 051022 Chandra Observations scheduled
  25. GRB051021B: Swift XRT refined analysis
  26. GRB051021a: optical observations
  27. GRB 051022: WSRT Radio Detection
  28. GRB 051022, mm counterpart
  29. GRB051022: host galaxy redshift
  30. GRB 051022: Swift/UVOT Upper Limits
  31. GRB051022: Radio Counterpart
  32. GRB 051022: SOAR JKs Observations
  33. GRB051021A: Swift XRT refined analysis
  34. Konus-Wind observation of GRB 051022
  35. GRB051022: Optical Observations
  36. GRB 051022: Magellan NIR imaging
  37. GRB 051021: PROMPT RcIc Observations
  38. GRB051021b: Magellan IR Imaging
  39. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  40. GRB 051021: Correction
  41. GRB 051022, J & K-band observation
  42. GRB 051021, SMARTS optical/IR observations
  43. GRB051022: Swift XRT Position
  44. GRB 051021: P200 Ks Observations
  45. IPN triangulation of GRB051022 (=H3950)
  46. GRB 051021: MDM Upper Limit
  47. GRB 051022 (=H3950): SXC Flight Localization is Valid
  48. GRB051021: Swift/UVOT Upper Limits
  49. GRB 051021B: Refined analysis of the Swift-BAT burst
  50. GRB 051022: SSO40 Optical Observations
  51. GRB 051022A: ROTSE-III Optical Limits
  52. GRB051022 (=H3590), A GRB Detected By HETE
  53. GRB 051022: Optical observations
  54. GRB 051021,optical observation
  55. GRB051021B: Swift XRT Position
  56. GRB 051021: SOAR NIR Observations
  57. GRB 051021B: Swift detection of a burst
  58. GRB051021: Swift XRT analysis
  59. GRB051021 (=H3947): Refined Analysis
  60. GRB 051021 : optical afterglow observation at Lulin
  61. GRB 051021: Optical observations
  62. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  63. GRB 051021: Optical observations and candidate afterglow
  64. GRB051021.63
  65. GRB051021.6: MASTER optical observation
  66. Swift-BAT trigger 160640 is not a real GRB
  67. GRB051021: A GRB Localized by HETE
  68. Swift-BAT trigger 160619 is not a GRB
  69. Swift-BAT triggered on a posible CR Shower or possible GRB
  70. GRB 050502b: Optical limit
  71. GRB 051016b: Optical limit
  72. Afterglow candidate of GRB 051016B observed at Lulin
  73. GRB 051016b: Gemini Near IR Observations
  74. GRB 051016A: Swift/UVOT upper limits
  75. GRB 051016B: refined analysis of the Swift/XRT data
  76. GRB 051016B: Swift/UVOT detection
  77. GRB 051016B,optical observation
  78. GRB 051016B : Optical follow-up at Lulin
  79. GRB 051016B: Refined analysis of the Swift-BAT burst
  80. GRB 051016B: Swift detection of a soft burst
  81. GRB 051016: Swift-BAT refined analysis
  82. GRB051016 XMM-Newton observation
  83. GRB051016: Swift XRT refined analysis.
  84. GRB 051016: LCO optical and near-IR imaging
  85. GRB 051016: PROMPT Observations
  86. GRB051016: Swift detection of a burst
  87. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  88. GRB051006: optical observations
  89. GRB 051012: Swift-BAT detection of burst yesterday
  90. Swift trigger 159578 is not a burst
  91. Swift-BAT Trigger 159578 is a possible burst
  92. GRB050805A: Rc optical observations
  93. GRB 051006: Swift/UVOT Upper Limits
  94. IBAS Alert 2675 : not a GRB
  95. GRB051008: optical candidate
  96. GRB 051008: - a high redshift high-luminosity burst?
  97. GRB 051008 - a low redshift low-luminosity burst?
  98. IBAS Alert 2673: not a real GRB
  99. GRB051011: MASTER optical observation
  100. GRB051008: optical observation

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