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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

26509 results found.

  1. GRB 050509B and short GRB-SN association? (corrected)
  2. GRB 050509B and short GRB-SN association?
  3. GRB050502b: Early Observation
  4. GRB050509b, Bok telescope B-band imaging
  5. Refined Chandra analysis of GRB 050509b
  6. GRB050509b, SDSS pre-burst observations
  7. GRB 050509b: Keck/Chandra Cross-Correlation
  8. GRB 050509b: Keck/Chandra Cross-Correlation
  9. Chandra observation of GRB 050509b
  10. GRB 050509b: RAPTOR deep, early limits.
  11. GRB050509B: Optical observations at the Very Large Telescope
  12. GRB 050509b: No Optical Variability in XRT Error Circle
  13. GRB 050509a: Swift-BAT refined analysis
  14. GRB 050509c: ROTSE-III Optical Limits
  15. GRB 050505, early TAROT observation
  16. GRB050509c: REM NIR and Optical observations
  17. GRB 050509b: Physical Properties of the Candidate Host galaxy
  18. GRB 050505: SARA Observations
  19. GRB 050509B, Optical Observations
  20. GRB 050509B: Swift/XRT refined analysis
  21. GRB 050509b: Optical observations
  22. GRB 050509A: Optical observations
  23. GRB050509b: Radio Observations
  24. GRB 050509b: PAIRITEL and WIYN Observations
  25. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  26. Swift Detection of GRB050509b: A short duration burst
  27. Swift Detection of the Burst GRB050509
  28. GRB 050505: early time observations
  29. GRB 050505, simultaneous optical observation
  30. GRB050505: AAVSO observations
  31. GRB050416A : 1 GHz limit from GMRT
  32. GRB050505: Optical Afterglow Candidate
  33. GRB050505 Swift-BAT refined analysis
  34. GRB 050416b:Swift XRT afterglow upper limits
  35. GRB 050416b:Swift XRT afterglow upper limits
  36. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  37. GRB050502b: Afterglow Confirmation
  38. GRB050502: P200 Observations (Correction)
  39. GRB050502: P200 Observations
  40. GRB 050504 : R band observation at Lulin observatory
  41. Swift UVOT observation of GRB 050504
  42. GRB 050504, R band Observations
  43. GRB 050502b, V band Observations
  44. GRB050504: P60 Observations
  45. GRB 050504: A long GRB detected with INTEGRAL
  46. GRB (?) 050504: IR Observations, Intriguing Source
  47. GRB 050502b, Optical observations
  48. GRB050502a: P60 Observations (Correction)
  49. GRB050502a: P60 Observations
  50. Renewal of SGR 1806-20 activity
  51. GRB050502B Swift-BAT refined analysis
  52. Swift UVOT refined analysis
  53. GRB 050502a : R band observation at Lulin observatory
  54. GRB 050502b : optical observation at Lulin observatory
  55. GRB 050502A: Redshift measurement based on Keck HIRES Observations
  56. Swift Detection of the Bright Burst GRB050502b
  57. GRB 050502: INTEGRAL results
  58. GRB 050502: ROTSE-III Detection of Possible Counterpart
  59. Swift/BAT possible detection of a weak burst GRB050430
  60. GRB050416a: Radio Detection
  61. GRB 050422: Swift-UVOT observation
  62. GRB 050422: Swift-BAT refined analysis
  63. Swift Detection of GRB 050422
  64. GRB 050421: SLOTIS observations
  65. GRB 050421: Further Analysis of IR imaging
  66. GRB050421: Radio Observations
  67. GRB050421: Radio Observations
  68. GRB 050421: IR Observations
  69. GRB 050421: Swift-BAT refined analysis
  70. GRB050421
  71. GRB 050421: early Swift XRT analysis results
  72. GRB 050421: NIR observations
  73. GRB050421: P60 Observations
  74. GRB 050421: BOOTES-2 simultaneous optical observations
  75. GRB 050416b: Tentative Swift XRT Position
  76. GRB 050315: potential host galaxy
  77. GRB050326: analysis of the XMM-Newton observation
  78. GRB050418: Null Optical Observations
  79. GRB050416A, optical observations
  80. GRB 050418: Swift-BAT refined analysis
  81. GRB 050416: Mitsume optical observation
  82. GRB050416B: IR observations
  83. GRB050412: Radio Observations
  84. GRB 050416: Swift/UVOT detection of afterglow emission
  85. GRB050416: Refined Swift-XRT analysis
  86. GRB 050416,optical observation
  87. GRB050416: P200 NIR Observations
  88. GRB 050416: Radio observations
  89. Swift BAT/XRT Detection of GRB 050416
  90. GRB 050412: PROMPT VRcIc Observations
  91. GRB 050408: Kuiper 1.5m observations
  92. GRB 050412: early Swift XRT analysis results
  93. GRB 050412: Early Optical/Ultraviolet Observations with
  94. GRB 050408: SDSS Field Calibration
  95. GRB050412: P60 Observations
  96. GRB 050412: Swift XRT Position
  97. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  98. GRB 050412: IR and Optical observations
  99. GRB 050412: IR Observations
  100. GRB050408: Radio Observations

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