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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"

28233 results found.

  1. GRB 050525: observatons of the optical afterglow
  2. GRB050525: ROTSE-III Refined Analysis
  3. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  4. XRF050522: Radio Observations
  5. Swift/UVOT observation of XRF 050522
  6. GRB 050509A: Further I-band imaging
  7. GRB050522,optical observation
  8. GRB050520,optical observation
  9. XRF 050522: Continued NIR P200 Monitoring
  10. RBO Observations of GRB050522
  11. Recent GRB BVRcIc field photometry
  12. GRB050520: Radio Observations
  13. XRF 050522: Swift XRT observation
  14. XRF050522, BVRcIc field photometry
  15. XRF050522: Optical Observations
  16. XRF050522: Near-infrared Observations
  17. GRB 050520: VLT/ULTRACAM observations
  18. GRB 050520: Swift XRT refined analysis
  19. XRF050509C: Chandra Afterglow Detection
  20. XRF050509c: Radio Observations
  21. GRB 050520: P200 Observations
  22. GRB 050520: TAROT optical limit
  23. GRB 050520: VLT/ULTRACAM observations
  24. XRF 050509c optical afterglow
  25. GRB 050509B and short GRB-SN association? (corrected)
  26. GRB 050509B and short GRB-SN association?
  27. GRB050502b: Early Observation
  28. GRB050509b, Bok telescope B-band imaging
  29. Refined Chandra analysis of GRB 050509b
  30. GRB050509b, SDSS pre-burst observations
  31. GRB 050509b: Keck/Chandra Cross-Correlation
  32. GRB 050509b: Keck/Chandra Cross-Correlation
  33. Chandra observation of GRB 050509b
  34. GRB 050509b: RAPTOR deep, early limits.
  35. GRB050509B: Optical observations at the Very Large Telescope
  36. GRB 050509b: No Optical Variability in XRT Error Circle
  37. GRB 050509a: Swift-BAT refined analysis
  38. GRB 050509c: ROTSE-III Optical Limits
  39. GRB 050505, early TAROT observation
  40. GRB050509c: REM NIR and Optical observations
  41. GRB 050509b: Physical Properties of the Candidate Host galaxy
  42. GRB 050505: SARA Observations
  43. GRB 050509B, Optical Observations
  44. GRB 050509B: Swift/XRT refined analysis
  45. GRB 050509b: Optical observations
  46. GRB 050509A: Optical observations
  47. GRB050509b: Radio Observations
  48. GRB 050509b: PAIRITEL and WIYN Observations
  49. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  50. Swift Detection of GRB050509b: A short duration burst
  51. Swift Detection of the Burst GRB050509
  52. GRB 050505: early time observations
  53. GRB 050505, simultaneous optical observation
  54. GRB050505: AAVSO observations
  55. GRB050416A : 1 GHz limit from GMRT
  56. GRB050505: Optical Afterglow Candidate
  57. GRB050505 Swift-BAT refined analysis
  58. GRB 050416b:Swift XRT afterglow upper limits
  59. GRB 050416b:Swift XRT afterglow upper limits
  60. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  61. GRB050502b: Afterglow Confirmation
  62. GRB050502: P200 Observations (Correction)
  63. GRB050502: P200 Observations
  64. GRB 050504 : R band observation at Lulin observatory
  65. Swift UVOT observation of GRB 050504
  66. GRB 050504, R band Observations
  67. GRB 050502b, V band Observations
  68. GRB050504: P60 Observations
  69. GRB 050504: A long GRB detected with INTEGRAL
  70. GRB (?) 050504: IR Observations, Intriguing Source
  71. GRB 050502b, Optical observations
  72. GRB050502a: P60 Observations (Correction)
  73. GRB050502a: P60 Observations
  74. Renewal of SGR 1806-20 activity
  75. GRB050502B Swift-BAT refined analysis
  76. Swift UVOT refined analysis
  77. GRB 050502a : R band observation at Lulin observatory
  78. GRB 050502b : optical observation at Lulin observatory
  79. GRB 050502A: Redshift measurement based on Keck HIRES Observations
  80. Swift Detection of the Bright Burst GRB050502b
  81. GRB 050502: INTEGRAL results
  82. GRB 050502: ROTSE-III Detection of Possible Counterpart
  83. Swift/BAT possible detection of a weak burst GRB050430
  84. GRB050416a: Radio Detection
  85. GRB 050422: Swift-UVOT observation
  86. GRB 050422: Swift-BAT refined analysis
  87. Swift Detection of GRB 050422
  88. GRB 050421: SLOTIS observations
  89. GRB 050421: Further Analysis of IR imaging
  90. GRB050421: Radio Observations
  91. GRB050421: Radio Observations
  92. GRB 050421: IR Observations
  93. GRB 050421: Swift-BAT refined analysis
  94. GRB050421
  95. GRB 050421: early Swift XRT analysis results
  96. GRB 050421: NIR observations
  97. GRB050421: P60 Observations
  98. GRB 050421: BOOTES-2 simultaneous optical observations
  99. GRB 050416b: Tentative Swift XRT Position
  100. GRB 050315: potential host galaxy

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