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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"

23721 results found.

  1. GRB 050306: No Swift UVOT Optical Counterpart Detected
  2. GRB 050306: REM optical-infrared observations
  3. GRB 050306: Possible X-ray Afterglow Position from the Swift
  4. Swift trigger 107518: optical observation
  5. GRB 050306: TAROT optical observations
  6. GRB 050306: Swift-BAT detection of a long burst
  7. Ongoing activity of SGR 1806-20 after the giant flare
  8. GRB050215B: Late-Time Swift UVOT Observations
  9. PROMPT VRcIc Observations of GRB 050223
  10. XRF/GRB 050215B: Radio Observations
  11. GRB 050219b: candidate NIR afterglow
  12. Confirmed XRF nature for GRB050215b
  13. GRB 050223: optical observations
  14. GRB050223 XMM-Newton observation
  15. INTEGRAL detection of GRB 050223
  16. GRB050223: No Swift UVOT Detection of Afterglow Emission
  17. GRB 050223 Swift/BAT detection of a burst
  18. GRB 050223: Swift XRT Position
  19. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  20. GRB050219b: CORRECTION to time of UVOT observations
  21. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  22. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  23. GRB 050219b: Optical and near-IR observations from LCO
  24. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  25. GRB 050219b: Swift-BAT detection of a burst
  26. GRB 050219a, optical observations
  27. GRB 050219a: Refined XRT position
  28. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  29. GRB 050219: Swift-BAT detection of a burst
  30. GRB050215b: Swift UVOT Detection of Afterglow Emission
  31. GRB 050219: Prompt X-ray position
  32. GRB 050215B: Radio Observations
  33. GRB 050215b: XRT confirmation of IR afterglow candidate
  34. GRB050215b: P60 Optical Observations
  35. GRB 050215b: Swift XRT Source Variability
  36. GRB 050215B: candidate afterglow
  37. GRB 050215b : Lulin follow-up observation
  38. GRB 050215b, BOOTES-2 simultaneous optical observations
  39. GRB 050215B: UKIRT K-band imaging
  40. GRB 050215b: Swift XRT Observations
  41. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  42. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  43. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  44. GRB 050209(=U11568): Duration and spectrum
  45. short/hard GRB 050202, optical observations
  46. GRB050209: REM optical observations
  47. GRB 050209 I-band observation
  48. GRB050209: P60 Optical Observations
  49. GRB050209 (=U11568): A Long GRB Detected by HETE
  50. GRB 050209: Optical observation
  51. GRB 050128: Radio observations
  52. Further analysis of the short Swift-BAT GRB 050202
  53. GRB 050202: Second epoch radio observations
  54. GRB 050129: Optical observations
  55. GRB050202: Radio Observations
  56. GRB 050202: Optical observations with LCO40
  57. GRB 050202: Short burst detected by Swift-BAT
  58. GRB 050128 Optical observation with REM
  59. GRB 050129: a weak long GRB detected with INTEGRAL
  60. SGR1806-20: Swift-BAT detection of a large normal burst
  61. GRB050128: Faulkes Telescope South observations
  62. GRB 050124: Radio Observations
  63. GRB 050128: near-infrared observations with REM
  64. GRB050126: Updated Swift XRT Position
  65. GRB 050126: Radio Observations
  66. GRB050128 Swift-BAT observations
  67. GRB 050128: Swift XRT prompt afterglow position
  68. GRB 050124: K-band afterglow observations
  69. GRB050126: MASTER optical limit for KECK OT
  70. GRB050126: Burst Parameters Measured by BAT
  71. GRB050126: MASTER optical observations
  72. GRB 050126: Prompt XRT detection and localization
  73. GRB050124: No Swift UVOT Detection of Afterglow Emission
  74. GRB 050117a: Radio Observations
  75. GRB 050124 : Lulin R-band follow-up observation
  76. GRB050124: Updated Swift XRT Position and Fluxes
  77. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  78. GRB050124: Refined BAT position, spectral and fluence information
  79. GRB050124: Swift-BAT position of a double-peaked burst
  80. GRB 050123 : I-band follow-up observation
  81. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  82. CFHTLS optical transient unlikely to be a GRB
  83. Unusual optical transient (GRB ???)
  84. GRB050117a: Refined analysis
  85. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  86. GRB050117b: Swift-BAT detection of a weak burst
  87. GRB050117: optical observation
  88. GRB 050117, I-band observations
  89. GRB050117: Refined XRT position
  90. GRB050117: MASTER optical observations
  91. MASTER:GRB050117 SWIFT
  92. GRB050117: Swift-BAT detection of a long multi-peaked burst
  93. SGR 1806-20: RXTE/PCA pulse frequency during flare
  94. SGR 1806-20: Further low frequency GMRT results
  95. SGR1806-20: Swift-BAT observations of two additional bursts
  96. Further VLA observations of SGR 1806-20
  97. Further ATCA observations of SGR 1806-20
  98. ATCA observations of SGR 1806-20
  99. Third epoch observations of SGR 1806-20 with VLA
  100. Second-epoch VLA observations of SGR 1806-20

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