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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"

20397 results found.

  1. XRF050522: Radio Observations
  2. Swift/UVOT observation of XRF 050522
  3. GRB 050509A: Further I-band imaging
  4. GRB050522,optical observation
  5. GRB050520,optical observation
  6. XRF 050522: Continued NIR P200 Monitoring
  7. Recent GRB BVRcIc field photometry
  8. GRB050520: Radio Observations
  9. XRF 050522: Swift XRT observation
  10. XRF050522, BVRcIc field photometry
  11. XRF050522: Optical Observations
  12. XRF050522: Near-infrared Observations
  13. GRB 050520: VLT/ULTRACAM observations
  14. GRB 050520: Swift XRT refined analysis
  15. XRF 050509c: Swift XRT Upper Limit
  16. XRF050509c: Radio Observations
  17. RBO Observations of GRB050520
  18. GRB 050520: P200 Observations
  19. GRB 050520: TAROT optical limit
  20. GRB 050520: VLT/ULTRACAM observations
  21. GRB 050504: Swift XRT afterglow candidate has faded
  22. GRB 050509B and short GRB-SN association? (corrected)
  23. GRB 050509B and short GRB-SN association?
  24. GRB050502b: Early Observation
  25. GRB050509b, Bok telescope B-band imaging
  26. GRB050509b, SDSS pre-burst observations
  27. GRB 050509b: Keck/Chandra Cross-Correlation
  28. GRB 050509b: Keck/Chandra Cross-Correlation
  29. Chandra observation of GRB 050509b
  30. GRB050509B: Optical observations at the Very Large Telescope
  31. GRB 050509b: No Optical Variability in XRT Error Circle
  32. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  33. GRB 050509c: ROTSE-III Optical Limits
  34. GRB 050505, early TAROT observation
  35. GRB050509c: REM NIR and Optical observations
  36. GRB 050505: SARA Observations
  37. GRB 050509B, Optical Observations
  38. GRB 050509b: Possible Optical Counterpart
  39. GRB 050509A: Optical observations
  40. GRB050509b: Radio Observations
  41. Swift Detection of GRB050509b: A short duration burst
  42. Swift Detection of the Burst GRB050509
  43. Swift-BAT detection of GRB 050507
  44. GRB 050502a: Swift XRT Upper Limit
  45. GRB 050505, simultaneous optical observation
  46. GRB050505: AAVSO observations
  47. GRB050416A : 1 GHz limit from GMRT
  48. GRB050505: Optical Afterglow Candidate
  49. GRB 050416b:Swift XRT afterglow upper limits
  50. GRB 050416b:Swift XRT afterglow upper limits
  51. Swift-BAT detection of GRB050505
  52. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  53. GRB050502b: Afterglow Confirmation
  54. GRB050502: P200 Observations (Correction)
  55. GRB050502: P200 Observations
  56. Swift UVOT observation of GRB 050504
  57. GRB050504: P60 Observations
  58. GRB 050504: A long GRB detected with INTEGRAL
  59. GRB (?) 050504: IR Observations, Intriguing Source
  60. GRB 050502b, Optical observations
  61. GRB050502a: P60 Observations (Correction)
  62. GRB050502a: P60 Observations
  63. GRB050502A: Optical Observations
  64. GRB050502B Swift-BAT refined analysis
  65. Swift Detection of the Bright Burst GRB050502b
  66. GRB 050502: ROTSE-III Detection of Possible Counterpart
  67. Swift/BAT possible detection of a weak burst GRB050430
  68. GRB050416a: Radio Detection
  69. Swift Detection of GRB 050422
  70. GRB 050421: SLOTIS observations
  71. GRB 050421: Further Analysis of IR imaging
  72. GRB050421: Radio Observations
  73. GRB050421: Radio Observations
  74. GRB 050421: IR Observations
  75. GRB050421
  76. GRB 050421: early Swift XRT analysis results
  77. GRB 050421: NIR observations
  78. GRB050421: P60 Observations
  79. GRB 050421: BOOTES-2 simultaneous optical observations
  80. Swift Detection of GRB050421
  81. GRB 050416b: Tentative Swift XRT Position
  82. GRB 050315: potential host galaxy
  83. GRB050326: analysis of the XMM-Newton observation
  84. GRB050418: Null Optical Observations
  85. GRB 050412: Chandra observations
  86. GRB050416A, optical observations
  87. GRB 050416: Mitsume optical observation
  88. GRB 050416 : optical observation at Xinglong observatory
  89. GRB050416B: IR observations
  90. GRB050412: Radio Observations
  91. GRB 050416: Swift/UVOT detection of afterglow emission
  92. GRB 050416,optical observation
  93. GRB050416: P200 NIR Observations
  94. GRB 050416: Radio observations
  95. Swift BAT/XRT Detection of GRB 050416
  96. GRB 050408: Kuiper 1.5m observations
  97. GRB 050412: Early Optical/Ultraviolet Observations with
  98. GRB 050408: SDSS Field Calibration
  99. GRB050412: P60 Observations
  100. Swift-BAT Detection of GRB 050412: A Bright, Long Burst

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