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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"

28235 results found.

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

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