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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"

28234 results found.

  1. GRB 050525, infrared observations
  2. GRB 050525: observatons of the optical afterglow
  3. GRB050525: ROTSE-III Refined Analysis
  4. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  5. XRF050522: Radio Observations
  6. Swift/UVOT observation of XRF 050522
  7. GRB 050509A: Further I-band imaging
  8. GRB050522,optical observation
  9. GRB050520,optical observation
  10. XRF 050522: Continued NIR P200 Monitoring
  11. RBO Observations of GRB050522
  12. Recent GRB BVRcIc field photometry
  13. GRB050520: Radio Observations
  14. XRF 050522: Swift XRT observation
  15. XRF050522, BVRcIc field photometry
  16. XRF050522: Optical Observations
  17. XRF050522: Near-infrared Observations
  18. GRB 050520: VLT/ULTRACAM observations
  19. GRB 050520: Swift XRT refined analysis
  20. XRF050509C: Chandra Afterglow Detection
  21. XRF050509c: Radio Observations
  22. GRB 050520: P200 Observations
  23. GRB 050520: TAROT optical limit
  24. GRB 050520: VLT/ULTRACAM observations
  25. XRF 050509c optical afterglow
  26. GRB 050509B and short GRB-SN association? (corrected)
  27. GRB 050509B and short GRB-SN association?
  28. GRB050502b: Early Observation
  29. GRB050509b, Bok telescope B-band imaging
  30. Refined Chandra analysis of GRB 050509b
  31. GRB050509b, SDSS pre-burst observations
  32. GRB 050509b: Keck/Chandra Cross-Correlation
  33. GRB 050509b: Keck/Chandra Cross-Correlation
  34. Chandra observation of GRB 050509b
  35. GRB 050509b: RAPTOR deep, early limits.
  36. GRB050509B: Optical observations at the Very Large Telescope
  37. GRB 050509b: No Optical Variability in XRT Error Circle
  38. GRB 050509a: Swift-BAT refined analysis
  39. GRB 050509c: ROTSE-III Optical Limits
  40. GRB 050505, early TAROT observation
  41. GRB050509c: REM NIR and Optical observations
  42. GRB 050509b: Physical Properties of the Candidate Host galaxy
  43. GRB 050505: SARA Observations
  44. GRB 050509B, Optical Observations
  45. GRB 050509B: Swift/XRT refined analysis
  46. GRB 050509b: Optical observations
  47. GRB 050509A: Optical observations
  48. GRB050509b: Radio Observations
  49. GRB 050509b: PAIRITEL and WIYN Observations
  50. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  51. Swift Detection of GRB050509b: A short duration burst
  52. Swift Detection of the Burst GRB050509
  53. GRB 050505: early time observations
  54. GRB 050505, simultaneous optical observation
  55. GRB050505: AAVSO observations
  56. GRB050416A : 1 GHz limit from GMRT
  57. GRB050505: Optical Afterglow Candidate
  58. GRB050505 Swift-BAT refined analysis
  59. GRB 050416b:Swift XRT afterglow upper limits
  60. GRB 050416b:Swift XRT afterglow upper limits
  61. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  62. GRB050502b: Afterglow Confirmation
  63. GRB050502: P200 Observations (Correction)
  64. GRB050502: P200 Observations
  65. GRB 050504 : R band observation at Lulin observatory
  66. Swift UVOT observation of GRB 050504
  67. GRB 050504, R band Observations
  68. GRB 050502b, V band Observations
  69. GRB050504: P60 Observations
  70. GRB 050504: A long GRB detected with INTEGRAL
  71. GRB (?) 050504: IR Observations, Intriguing Source
  72. GRB 050502b, Optical observations
  73. GRB050502a: P60 Observations (Correction)
  74. GRB050502a: P60 Observations
  75. Renewal of SGR 1806-20 activity
  76. GRB050502B Swift-BAT refined analysis
  77. Swift UVOT refined analysis
  78. GRB 050502a : R band observation at Lulin observatory
  79. GRB 050502b : optical observation at Lulin observatory
  80. GRB 050502A: Redshift measurement based on Keck HIRES Observations
  81. Swift Detection of the Bright Burst GRB050502b
  82. GRB 050502: INTEGRAL results
  83. GRB 050502: ROTSE-III Detection of Possible Counterpart
  84. Swift/BAT possible detection of a weak burst GRB050430
  85. GRB050416a: Radio Detection
  86. GRB 050422: Swift-UVOT observation
  87. GRB 050422: Swift-BAT refined analysis
  88. Swift Detection of GRB 050422
  89. GRB 050421: SLOTIS observations
  90. GRB 050421: Further Analysis of IR imaging
  91. GRB050421: Radio Observations
  92. GRB050421: Radio Observations
  93. GRB 050421: IR Observations
  94. GRB 050421: Swift-BAT refined analysis
  95. GRB050421
  96. GRB 050421: early Swift XRT analysis results
  97. GRB 050421: NIR observations
  98. GRB050421: P60 Observations
  99. GRB 050421: BOOTES-2 simultaneous optical observations
  100. GRB 050416b: Tentative Swift XRT Position

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