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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"

11395 results found.

  1. GRB 050607: Optical decay and spectral slope
  2. Optical Afterglow of GRB 050607
  3. Konus-Wind observation of GRB 050603
  4. GRB050528: updated Liverpool Telescope limits
  5. GRB 050525: RTT150, Optical observations
  6. GRB 050525: MITSuME Optical Observation in VRI
  7. GRB050525: Super-LOTIS observations
  8. GRB 050525A: Swift-BAT refined analysis
  9. GRB050525: Optical observations
  10. Konus-Wind observation of GRB 050525
  11. INTEGRAL detection of GRB 050525
  12. GRB 050525, infrared observations
  13. GRB 050525: Optical observation
  14. GRB050525: ROTSE-III Refined Analysis
  15. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  16. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  17. XRF050522: NIR observations of XRT candidate
  18. XRF 050522: Swift XRT refined analysis
  19. GRB 050509A: Further I-band imaging
  20. GRB050522,optical observation
  21. GRB050520,optical observation
  22. GRB050509b: optical observations
  23. XRF 050522: Swift XRT observation
  24. XRF050522: Optical Observations
  25. XRF 050522 detected with INTEGRAL
  26. GRB 050520: Swift XRT refined analysis
  27. XRF050509C: Chandra Afterglow Detection
  28. XRF 050509c: Swift XRT Upper Limit
  29. GRB050520: Liverpool Telescope follow-up
  30. GRB 050520 - A long GRB detected with INTEGRAL
  31. Swift-BAT trigger 122203 is not a real GRB
  32. GRB 050509B and short GRB-SN association? (corrected)
  33. GRB 050509B and short GRB-SN association?
  34. GRB050509b, Bok telescope B-band imaging
  35. Chandra observation of GRB 050509b
  36. GRB 050509b: RAPTOR deep, early limits.
  37. GRB 050509a: Swift-BAT refined analysis
  38. GRB 050509c: ROTSE-III Optical Limits
  39. GRB 050509A: Optical observations
  40. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  41. GRB 050509B: ROTSE-III Optical Limits
  42. GRB 050509a: Swift XRT Position
  43. Swift-BAT detection of GRB 050507
  44. GRB 050502a: Swift XRT Upper Limit
  45. GRB050416A : 1 GHz limit from GMRT
  46. GRB050505 Swift-BAT refined analysis
  47. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  48. GRB050502b: Afterglow Confirmation
  49. GRB 050504, R band Observations
  50. GRB 050504: A long GRB detected with INTEGRAL
  51. Renewal of SGR 1806-20 activity
  52. GRB050502A: Optical Observations
  53. GRB 050502: INTEGRAL results
  54. GRB 050502 - A long GRB detected with INTEGRAL
  55. GRB 050421: SLOTIS observations
  56. GRB 050421: IR Observations
  57. GRB 050421: ROTSE-III Optical Limits
  58. GRB 050421: NIR observations
  59. Swift Detection of GRB050421
  60. GRB050326: analysis of the XMM-Newton observation
  61. GRB 050412: Chandra observations
  62. Swift-BAT detection of the bright and long GRB 050418
  63. GRB 050416B: optical observations
  64. GRB 050416: Swift-BAT refined analysis
  65. GRB 050416: Radio observations
  66. GRB 050408: RTT150 optical observations
  67. GRB050408: optical observation
  68. GRB 050412 : XingLong optical observation
  69. GRB050412: optical limit before and during GRB
  70. GRB050412: ROTSE-III Optical Limits
  71. GRB 050410, optical observations
  72. GRB 050410, optical observations
  73. GRB 050408: Swift XRT measurement of possible jet break
  74. Swift-BAT detection of GRB 050410
  75. GRB 050410: Swift XRT Position
  76. GRB 050408: Optical limit at 20 min after the burst
  77. GRB 050408, optical observations
  78. GRB 050408,optical observation
  79. GRB 050408: Mercator Optical Observations
  80. GRB 050408, optical observations
  81. GRB 050408: ROTSE-III Optical Limits
  82. Konus-Wind observation of GRB 050401
  83. GRB 050401 BAT refined analysis
  84. Swift Trigger 113225: P60 Observations
  85. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  86. Swift-BAT detection of GRB 050401
  87. GRB 050401: Prompt XRT position
  88. GRB050331: No Afterglow Detected
  89. Swift-BAT detection of GRB 050331
  90. Konus-Wind observation of GRB 050326
  91. GRB050326: optical limit 33min before GRB
  92. GRB050319, optical observations
  93. GRB050319: optical observation, March 20-22
  94. Swift-BAT detection of a bright outburst from SGR1806-20
  95. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  96. GRB 050319: ROTSE-III Refined Analysis
  97. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  98. GRB 050319: NIR afterglow candidate
  99. GRB 050319:Near IR afterglow
  100. GRB050319: BR optical photometry

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