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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"

19259 results found.

  1. GRB 050509B and short GRB-SN association? (corrected)
  2. GRB 050509B and short GRB-SN association?
  3. GRB050509b, Bok telescope B-band imaging
  4. Refined Chandra analysis of GRB 050509b
  5. GRB050509b, SDSS pre-burst observations
  6. GRB 050509b: RAPTOR deep, early limits.
  7. GRB 050509b Milagro GeV/TeV Observations
  8. GRB 050509a: Swift-BAT refined analysis
  9. GRB 050505, early TAROT observation
  10. GRB 050509b: Physical Properties of the Candidate Host galaxy
  11. GRB 050505: SARA Observations
  12. GRB 050509B, Optical Observations
  13. GRB 050509B: Swift/XRT refined analysis
  14. GRB 050509b: Optical observations
  15. GRB 050509b: Possible Optical Counterpart
  16. GRB 050509b: PAIRITEL and WIYN Observations
  17. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  18. GRB 050505: early time observations
  19. GRB 050505, simultaneous optical observation
  20. GRB050505: AAVSO observations
  21. GRB050416A : 1 GHz limit from GMRT
  22. GRB050505 Swift-BAT refined analysis
  23. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  24. GRB050502b: Afterglow Confirmation
  25. GRB 050504 : R band observation at Lulin observatory
  26. GRB 050504, R band Observations
  27. GRB 050502b, V band Observations
  28. GRB 050504: A long GRB detected with INTEGRAL
  29. Renewal of SGR 1806-20 activity
  30. GRB050502B Swift-BAT refined analysis
  31. Swift UVOT refined analysis
  32. GRB 050502a : R band observation at Lulin observatory
  33. GRB 050502b : optical observation at Lulin observatory
  34. GRB 050502A: Redshift measurement based on Keck HIRES Observations
  35. Swift Detection of the Bright Burst GRB050502b
  36. GRB 050502: INTEGRAL results
  37. GRB 050422: Swift-UVOT observation
  38. GRB 050422: Swift-BAT refined analysis
  39. GRB 050421: Swift-BAT refined analysis
  40. GRB 050421: early Swift XRT analysis results
  41. GRB 050315: potential host galaxy
  42. GRB050326: analysis of the XMM-Newton observation
  43. GRB050418: Null Optical Observations
  44. GRB 050418: Swift-BAT refined analysis
  45. GRB050416: Refined Swift-XRT analysis
  46. GRB 050416: Swift-BAT refined analysis
  47. GRB 050416: Radio observations
  48. GRB 050412: PROMPT VRcIc Observations
  49. GRB 050412: early Swift XRT analysis results
  50. GRB 050412: Swift-BAT refined analysis
  51. GRB 050412: Swift XRT Position
  52. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  53. GRB 050401: Optical limit
  54. Swift-BAT detection of GRB 050410
  55. GRB 050408: WIDGET simultaneous optical observations
  56. GRB 050408: Swift XRT analysis
  57. GRB 050408: Optical limit at 20 min after the burst
  58. GRB 050408: Mercator Optical Observations
  59. GRB 050408 optical candidate
  60. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  61. GRB050408: MASTER optical observations
  62. GRB 050406: early Swift XRT analysis results
  63. GRB 050406 BAT refined analysis
  64. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  65. GRB 050401: VLT spectroscopic redshift
  66. GRB 050401 BAT refined analysis
  67. GRB050401: TNG R-band observation
  68. GRB 050401: Prompt XRT position
  69. Retraction of three Swift GRB triggers
  70. Swift-BAT detection of GRB 050331b
  71. Swift-BAT detection of GRB 050331
  72. GRB 050326: Swift XRT Position
  73. GRB 050326 BAT refined analysis
  74. GRB050326: delayed XRT observation
  75. GRB050319, color indices
  76. GRB050319: RTT150 Optical Observations
  77. Swift-BAT trigger 112060 is not a real GRB
  78. GRB 050319: ROTSE-III Refined Analysis
  79. GRB 050318: Swift-BAT refined analysis
  80. GRB 050319: Swift-UVOT detection of the afterglow
  81. GRB 050315: Variability Analysis of Swift BAT Time History
  82. GRB 050318: SWIFT-UVOT refined analysis
  83. GRB 050319 : Confirmation of optical afterglow decay
  84. GRB 050319: Swift-BAT refined analysis
  85. Swift Detection of GRB 050319
  86. GRB 050318: Swift/UVOT detection of afterglow emission
  87. RXTE Observations of GRB050318
  88. Swift-BAT detection of GRB 050318
  89. GRB050223: analysis of the XMM-Newton observation
  90. GRB 050315: Swift-BAT further refined analysis
  91. GRB050315: Swift-BAT Refined analysis
  92. Non-detection of GRB050315 in ATCA Radio Observations
  93. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  94. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  95. Swift-BAT trigger 107873: No Swift XRT counterpart
  96. GRB 050306: Confirmation of X-ray afterglow
  97. GRB 050306: further TAROT optical data
  98. GRB050309: Early optical limit from P60
  99. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  100. GRB 050309 : Lulin R-band observation

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