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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"

28112 results found.

  1. Confirmed XRF nature for GRB050215b
  2. GRB050223 XMM-Newton observation
  3. INTEGRAL detection of GRB 050223
  4. GRB050223: ROTSE-III Optical Observations
  5. GRB 050223 Swift/BAT detection of a burst
  6. GRB 050223: Swift XRT Position
  7. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  8. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  9. GRB 050219a: Optical observations from LCO
  10. GRB 050219b: Optical and near-IR observations from LCO
  11. GRB 050219b: Swift-BAT detection of a burst
  12. GRB 050219b: CORRECTION: Swift XRT Position
  13. GRB 050219b: Swift XRT Position
  14. GRB 050219: Swift-BAT detection of a burst
  15. GRB 050215b: XRT confirmation of IR afterglow candidate
  16. GRB050215b: P60 Optical Observations
  17. GRB 050215b: Swift XRT Source Variability
  18. GRB 050215B: candidate afterglow
  19. GRB 050215b : Lulin follow-up observation
  20. GRB 050215b, BOOTES-2 simultaneous optical observations
  21. GRB050215A: ROTSE-III Optical Observations
  22. GRB050209: TAROT optical observations
  23. GRB 050209(=U11568): Duration and spectrum
  24. GRB050209: REM optical observations
  25. GRB 050209 I-band observation
  26. GRB 050209 Optical observations
  27. GRB050209: P60 Optical Observations
  28. GRB 050128: Radio observations
  29. Further analysis of the short Swift-BAT GRB 050202
  30. GRB 050202: Short burst detected by Swift-BAT
  31. GRB 050128 Optical observation with REM
  32. SGR1806-20: Swift-BAT detection of a large normal burst
  33. GRB 050128: near-infrared observations with REM
  34. GRB050128,optical observations
  35. GRB050128 Swift-BAT observations
  36. GRB 050128: Swift XRT prompt afterglow position
  37. GRB050126: MASTER optical limit for KECK OT
  38. GRB050126: Burst Parameters Measured by BAT
  39. GRB050126: MASTER optical observations
  40. GRB 050124 I-band observation
  41. GRB050124,optical observation
  42. GRB 050124 : Lulin R-band follow-up observation
  43. GRB050124: Updated Swift XRT Position and Fluxes
  44. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  45. GRB050124: Refined BAT position, spectral and fluence information
  46. GRB 050123 : I-band follow-up observation
  47. GRB050123,optical observation
  48. GRB 050123: KAIT observations
  49. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  50. GRB050117: Refined XRT position
  51. GRB050117: MASTER optical observations
  52. MASTER:GRB050117 SWIFT
  53. GRB050117: Swift XRT Position
  54. Triangulation of Short Hard GRB050112 (large error box)
  55. SGR 1806-20: Further VLA Observations
  56. SGR1806-20: Swift-BAT observations of two additional bursts
  57. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  58. Further VLA observations of SGR 1806-20
  59. SGR 1806-20 and extragalactic short-duration GRBs
  60. Further ATCA observations of SGR 1806-20
  61. Fourth Epoch VLA observations of SGR 1806-20
  62. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  63. ATCA observations of SGR 1806-20
  64. SGR 1806-20, RHESSI observations of the 041227 giant flare
  65. Third epoch observations of SGR 1806-20 with VLA
  66. Second Epoch VLA observations of SGR 1806-20
  67. Second-epoch VLA observations of SGR 1806-20
  68. SGR1806 VLA Observations
  69. SGR1806-20: RXTE-PCA observation of the 041227 super-flare
  70. GRB 041217: Optical observations
  71. GRB041228: Swift-BAT detection of a burst
  72. GRB041219; RXTE ASM Observations
  73. NIR Observations of GRB 041219
  74. GRB041226: Swift-BAT detection of a burst
  75. GRB041223: decay of the afterglow
  76. GRB 041224: near-infrared observations with REM
  77. GRB 041223 Fluence measured by Swift-BAT
  78. GRB041223: optical and NIR observations with REM
  79. Swift-BAT Time History of GRB041219
  80. GRB 041219: TAROT optical observations
  81. GRB 041218: TAROT optical observations
  82. GRB 041223: J-band observations of the afterglow
  83. GRB 041219c: PROMPT Observations
  84. GRB041223: Swift-BAT detection of a bright long burst
  85. GRB 041218: optical observations
  86. GRB 041219 : optical follow-up observations
  87. Deep RAPTOR observations during GRB 041219
  88. GRB 041218 Optical Observations
  89. GRB041219: Continued NIR Observations
  90. GRB 041219 ,optical observation
  91. GRB 041219: Radio Afterglow Detection
  92. GRB 041218 : Radio Observations
  93. GRB 041218: R-band optical observations
  94. GRB041218: optical observations
  95. GRB041219: Confirmed NIR Afterglow
  96. Swift-BAT detection of the bright long burst GRB041219
  97. GRB 041219: Infrared Afterglow Candidate
  98. GRB041219, BVRcIc field calibration
  99. GRB 041219: Infrared Afterglow Candidate
  100. GRB041218, BVRcIc field calibration

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