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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"

19260 results found.

  1. XRF 050509c optical afterglow
  2. GRB 050509B and short GRB-SN association? (corrected)
  3. GRB 050509B and short GRB-SN association?
  4. GRB050509b, Bok telescope B-band imaging
  5. Refined Chandra analysis of GRB 050509b
  6. GRB050509b, SDSS pre-burst observations
  7. GRB 050509b: RAPTOR deep, early limits.
  8. GRB 050509b Milagro GeV/TeV Observations
  9. GRB 050509a: Swift-BAT refined analysis
  10. GRB 050505, early TAROT observation
  11. GRB 050509b: Physical Properties of the Candidate Host galaxy
  12. GRB 050505: SARA Observations
  13. GRB 050509B, Optical Observations
  14. GRB 050509B: Swift/XRT refined analysis
  15. GRB 050509b: Optical observations
  16. GRB 050509b: Possible Optical Counterpart
  17. GRB 050509b: PAIRITEL and WIYN Observations
  18. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  19. GRB 050505: early time observations
  20. GRB 050505, simultaneous optical observation
  21. GRB050505: AAVSO observations
  22. GRB050416A : 1 GHz limit from GMRT
  23. GRB050505 Swift-BAT refined analysis
  24. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  25. GRB050502b: Afterglow Confirmation
  26. GRB 050504 : R band observation at Lulin observatory
  27. GRB 050504, R band Observations
  28. GRB 050502b, V band Observations
  29. GRB 050504: A long GRB detected with INTEGRAL
  30. Renewal of SGR 1806-20 activity
  31. GRB050502B Swift-BAT refined analysis
  32. Swift UVOT refined analysis
  33. GRB 050502a : R band observation at Lulin observatory
  34. GRB 050502b : optical observation at Lulin observatory
  35. GRB 050502A: Redshift measurement based on Keck HIRES Observations
  36. Swift Detection of the Bright Burst GRB050502b
  37. GRB 050502: INTEGRAL results
  38. GRB 050422: Swift-UVOT observation
  39. GRB 050422: Swift-BAT refined analysis
  40. GRB 050421: Swift-BAT refined analysis
  41. GRB 050421: early Swift XRT analysis results
  42. GRB 050315: potential host galaxy
  43. GRB050326: analysis of the XMM-Newton observation
  44. GRB050418: Null Optical Observations
  45. GRB 050418: Swift-BAT refined analysis
  46. GRB050416: Refined Swift-XRT analysis
  47. GRB 050416: Swift-BAT refined analysis
  48. GRB 050416: Radio observations
  49. GRB 050412: PROMPT VRcIc Observations
  50. GRB 050412: early Swift XRT analysis results
  51. GRB 050412: Swift-BAT refined analysis
  52. GRB 050412: Swift XRT Position
  53. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  54. GRB 050401: Optical limit
  55. Swift-BAT detection of GRB 050410
  56. GRB 050408: WIDGET simultaneous optical observations
  57. GRB 050408: Swift XRT analysis
  58. GRB 050408: Optical limit at 20 min after the burst
  59. GRB 050408: Mercator Optical Observations
  60. GRB 050408 optical candidate
  61. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  62. GRB050408: MASTER optical observations
  63. GRB 050406: early Swift XRT analysis results
  64. GRB 050406 BAT refined analysis
  65. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  66. GRB 050401: VLT spectroscopic redshift
  67. GRB 050401 BAT refined analysis
  68. GRB050401: TNG R-band observation
  69. GRB 050401: Prompt XRT position
  70. Retraction of three Swift GRB triggers
  71. Swift-BAT detection of GRB 050331b
  72. Swift-BAT detection of GRB 050331
  73. GRB 050326: Swift XRT Position
  74. GRB 050326 BAT refined analysis
  75. GRB050326: delayed XRT observation
  76. GRB050319, color indices
  77. GRB050319: RTT150 Optical Observations
  78. Swift-BAT trigger 112060 is not a real GRB
  79. GRB 050319: ROTSE-III Refined Analysis
  80. GRB 050318: Swift-BAT refined analysis
  81. GRB 050319: Swift-UVOT detection of the afterglow
  82. GRB 050315: Variability Analysis of Swift BAT Time History
  83. GRB 050318: SWIFT-UVOT refined analysis
  84. GRB 050319 : Confirmation of optical afterglow decay
  85. GRB 050319: Swift-BAT refined analysis
  86. Swift Detection of GRB 050319
  87. GRB 050318: Swift/UVOT detection of afterglow emission
  88. RXTE Observations of GRB050318
  89. Swift-BAT detection of GRB 050318
  90. GRB050223: analysis of the XMM-Newton observation
  91. GRB 050315: Swift-BAT further refined analysis
  92. GRB050315: Swift-BAT Refined analysis
  93. Non-detection of GRB050315 in ATCA Radio Observations
  94. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  95. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  96. Swift-BAT trigger 107873: No Swift XRT counterpart
  97. GRB 050306: Confirmation of X-ray afterglow
  98. GRB 050306: further TAROT optical data
  99. GRB050309: Early optical limit from P60
  100. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts

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