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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"

28123 results found.

  1. Recent GRB BVRcIc field photometry
  2. GRB050520: Radio Observations
  3. XRF 050522: Swift XRT observation
  4. XRF050522, BVRcIc field photometry
  5. XRF050522: Optical Observations
  6. XRF050522: Near-infrared Observations
  7. GRB 050520: VLT/ULTRACAM observations
  8. GRB 050520: Swift XRT refined analysis
  9. XRF050509C: Chandra Afterglow Detection
  10. XRF050509c: Radio Observations
  11. GRB 050520: P200 Observations
  12. GRB 050520: TAROT optical limit
  13. GRB 050520: VLT/ULTRACAM observations
  14. XRF 050509c optical afterglow
  15. GRB 050509B and short GRB-SN association? (corrected)
  16. GRB 050509B and short GRB-SN association?
  17. GRB050502b: Early Observation
  18. GRB050509b, Bok telescope B-band imaging
  19. Refined Chandra analysis of GRB 050509b
  20. GRB050509b, SDSS pre-burst observations
  21. GRB 050509b: Keck/Chandra Cross-Correlation
  22. GRB 050509b: Keck/Chandra Cross-Correlation
  23. Chandra observation of GRB 050509b
  24. GRB 050509b: RAPTOR deep, early limits.
  25. GRB050509B: Optical observations at the Very Large Telescope
  26. GRB 050509b: No Optical Variability in XRT Error Circle
  27. GRB 050509a: Swift-BAT refined analysis
  28. GRB 050509c: ROTSE-III Optical Limits
  29. GRB 050505, early TAROT observation
  30. GRB050509c: REM NIR and Optical observations
  31. GRB 050509b: Physical Properties of the Candidate Host galaxy
  32. GRB 050505: SARA Observations
  33. GRB 050509B, Optical Observations
  34. GRB 050509B: Swift/XRT refined analysis
  35. GRB 050509b: Optical observations
  36. GRB 050509A: Optical observations
  37. GRB050509b: Radio Observations
  38. GRB 050509b: PAIRITEL and WIYN Observations
  39. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  40. Swift Detection of GRB050509b: A short duration burst
  41. Swift Detection of the Burst GRB050509
  42. GRB 050505: early time observations
  43. GRB 050505, simultaneous optical observation
  44. GRB050505: AAVSO observations
  45. GRB050416A : 1 GHz limit from GMRT
  46. GRB050505: Optical Afterglow Candidate
  47. GRB050505 Swift-BAT refined analysis
  48. GRB 050416b:Swift XRT afterglow upper limits
  49. GRB 050416b:Swift XRT afterglow upper limits
  50. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  51. GRB050502b: Afterglow Confirmation
  52. GRB050502: P200 Observations (Correction)
  53. GRB050502: P200 Observations
  54. GRB 050504 : R band observation at Lulin observatory
  55. Swift UVOT observation of GRB 050504
  56. GRB 050504, R band Observations
  57. GRB 050502b, V band Observations
  58. GRB050504: P60 Observations
  59. GRB 050504: A long GRB detected with INTEGRAL
  60. GRB (?) 050504: IR Observations, Intriguing Source
  61. GRB 050502b, Optical observations
  62. GRB050502a: P60 Observations (Correction)
  63. GRB050502a: P60 Observations
  64. Renewal of SGR 1806-20 activity
  65. GRB050502B Swift-BAT refined analysis
  66. Swift UVOT refined analysis
  67. GRB 050502a : R band observation at Lulin observatory
  68. GRB 050502b : optical observation at Lulin observatory
  69. GRB 050502A: Redshift measurement based on Keck HIRES Observations
  70. Swift Detection of the Bright Burst GRB050502b
  71. GRB 050502: INTEGRAL results
  72. GRB 050502: ROTSE-III Detection of Possible Counterpart
  73. Swift/BAT possible detection of a weak burst GRB050430
  74. GRB050416a: Radio Detection
  75. GRB 050422: Swift-UVOT observation
  76. GRB 050422: Swift-BAT refined analysis
  77. Swift Detection of GRB 050422
  78. GRB 050421: SLOTIS observations
  79. GRB 050421: Further Analysis of IR imaging
  80. GRB050421: Radio Observations
  81. GRB050421: Radio Observations
  82. GRB 050421: IR Observations
  83. GRB 050421: Swift-BAT refined analysis
  84. GRB050421
  85. GRB 050421: early Swift XRT analysis results
  86. GRB 050421: NIR observations
  87. GRB050421: P60 Observations
  88. GRB 050421: BOOTES-2 simultaneous optical observations
  89. GRB 050416b: Tentative Swift XRT Position
  90. GRB 050315: potential host galaxy
  91. GRB050326: analysis of the XMM-Newton observation
  92. GRB050418: Null Optical Observations
  93. GRB050416A, optical observations
  94. GRB 050418: Swift-BAT refined analysis
  95. GRB 050416: Mitsume optical observation
  96. GRB050416B: IR observations
  97. GRB050412: Radio Observations
  98. GRB 050416: Swift/UVOT detection of afterglow emission
  99. GRB050416: Refined Swift-XRT analysis
  100. GRB 050416,optical observation

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