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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"

43854 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,optical observation
  7. GRB 050306: Swift-BAT detection of a long burst
  8. Ongoing activity of SGR 1806-20 after the giant flare
  9. GRB050215B: Late-Time Swift UVOT Observations
  10. GRB 050126: Confirmation of the NIR afterglow candidate
  11. PROMPT VRcIc Observations of GRB 050223
  12. XRF/GRB 050215B: Radio Observations
  13. XMM-Newton Images of GRB 050223
  14. GRB 050219b: candidate NIR afterglow
  15. IBAS GRB Alert #2321
  16. Confirmed XRF nature for GRB050215b
  17. GRB 050223: optical observations
  18. GRB050223 XMM-Newton observation
  19. INTEGRAL detection of GRB 050223
  20. GRB050223: No Swift UVOT Detection of Afterglow Emission
  21. GRB050223: ROTSE-III Optical Observations
  22. GRB 050223 Swift/BAT detection of a burst
  23. GRB 050223: Swift XRT Position
  24. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  25. GRB050219b: CORRECTION to time of UVOT observations
  26. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  27. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  28. GRB 050219b: CORRECTION to refined XRT position
  29. GRB 050219a: Optical observations from LCO
  30. GRB 050219b: Optical and near-IR observations from LCO
  31. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  32. GRB 050219b: Refined XRT position
  33. GRB 050219b: Swift-BAT detection of a burst
  34. GRB 050219b: CORRECTION: Swift XRT Position
  35. GRB 050219b: Swift XRT Position
  36. GRB 050219a, optical observations
  37. GRB 050219a: Refined XRT position
  38. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  39. GRB 050219: Swift-BAT detection of a burst
  40. GRB050215b: Swift UVOT Detection of Afterglow Emission
  41. GRB 050219: Prompt X-ray position
  42. GRB 050215B: Radio Observations
  43. GRB 050215b: XRT confirmation of IR afterglow candidate
  44. GRB050215b: P60 Optical Observations
  45. GRB 050215b: Swift XRT Source Variability
  46. GRB 050215B: candidate afterglow
  47. GRB 050215b : Lulin follow-up observation
  48. GRB 050215b, BOOTES-2 simultaneous optical observations
  49. GRB 050215B: UKIRT K-band imaging
  50. GRB 050215b: Swift XRT Observations
  51. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  52. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  53. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  54. GRB 050215b, BOOTES-1B optical limit
  55. GRB050215B: ROTSE-III optical observations
  56. GRB050215A: ROTSE-III Optical Observations
  57. GRB050209: TAROT optical observations
  58. GRB 050209(=U11568): Duration and spectrum
  59. short/hard GRB 050202, optical observations
  60. GRB050209: REM optical observations
  61. GRB 050209 I-band observation
  62. GRB 050209 Optical observations
  63. GRB050209: P60 Optical Observations
  64. GRB050209 (=U11568): A Long GRB Detected by HETE
  65. GRB 050209: Optical observation
  66. GRB 050128: Radio observations
  67. Further analysis of the short Swift-BAT GRB 050202
  68. GRB 050202: Second epoch radio observations
  69. GRB 050129: Optical observations
  70. GRB050202: Radio Observations
  71. GRB 050202: Optical observations with LCO40
  72. GRB 050202: Short burst detected by Swift-BAT
  73. GRB 050128 Optical observation with REM
  74. GRB 050129: a weak long GRB detected with INTEGRAL
  75. SGR1806-20: Swift-BAT detection of a large normal burst
  76. GRB050128: Faulkes Telescope South observations
  77. GRB 050124: Radio Observations
  78. GRB 050128: near-infrared observations with REM
  79. GRB050128,optical observations
  80. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  81. GRB050126: Updated Swift XRT Position
  82. SGR 1806-20: GMRT results at 240 MHz band.
  83. SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
  84. GRB 050126: Radio Observations
  85. GRB050128 Swift-BAT observations
  86. GRB 050128: Swift XRT prompt afterglow position
  87. HETE #3667: P60 Observations
  88. GRB050126: Burst Parameters Measured by BAT
  89. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  90. GRB 050126: Prompt XRT detection and localization
  91. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  92. GRB050124: No Swift UVOT Detection of Afterglow Emission
  93. GRB 050117a: Radio Observations
  94. GRB 050124: NIR Candidates from Keck/NIRC
  95. GRB050124,optical observation
  96. GRB 050124 : Lulin R-band follow-up observation
  97. GRB050124: Updated Swift XRT Position and Fluxes
  98. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  99. GRB050124: Refined BAT position, spectral and fluence information
  100. GRB050124: Swift-BAT position of a double-peaked burst

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