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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"

37715 results found.

  1. GRB 050416: KAIT observations
  2. GRB050416: P200 NIR Observations
  3. GRB 050416: Swift XRT Position
  4. GRB 050416: Radio observations
  5. Confirmation of OT for GRB050416
  6. GRB050416: P60 Afterglow Candidate
  7. Swift BAT/XRT Detection of GRB 050416
  8. GRB 050412: Subaru observations
  9. GRB 050408: RTT150 optical observations
  10. GRB 050412: PROMPT VRcIc Observations
  11. GRB 050408: Kuiper 1.5m observations
  12. GRB 050412: optical limit
  13. GRB 050412: optical observations
  14. GRB 050408: refined XRT analysis, no jet break seen yet
  15. GRB 050412: early Swift XRT analysis results
  16. GRB 050412 : XingLong optical observation
  17. GRB 050412: Swift-BAT refined analysis
  18. GRB 050412: ANU 2.3m observations
  19. GRB 050412: Early Optical/Ultraviolet Observations with
  20. GRB 050412: retraction of UVOT transient report
  21. GRB 050412: UVOT transient not in XRT error circle
  22. GRB 050408: SDSS Field Calibration
  23. GRB 050412: Optical limit
  24. GRB 050412: LCO Optical Observations
  25. GRB 050412: Optical observations
  26. GRB050412: P60 Observations
  27. GRB 050412: Swift XRT Position
  28. GRB050412: optical limit before and during GRB
  29. GRB 050412: LCO optical observations
  30. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  31. GRB 050412: IR and Optical observations
  32. GRB 050412: IR Observations
  33. GRB050408: Radio Observations
  34. GRB 050401: Optical limit
  35. GRB 050408: Optical limit
  36. GRB050410: P60 Observations
  37. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  38. GRB 050410, optical observations
  39. GRB 050408: PROMPT VRcIc Observations
  40. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  41. GRB 050410 R band Optical Observations
  42. GRB050410 : Null detection report
  43. GRB 050410, optical observations
  44. GRB050410: Radio Observations
  45. GRB 050408: Swift XRT measurement of possible jet break
  46. GRB050410: MASTER optical observations
  47. GRB 050410: Early observations with Swift-UVOT
  48. Swift-BAT detection of GRB 050410
  49. GRB 050410: Swift XRT Position
  50. GRB 050408: Retraction of Proposed Host Galaxy
  51. GRB 050408: Inconsistency of host galaxy identification
  52. GRB 050408: Subaru Observations
  53. GRB 050408: WIDGET simultaneous optical observations
  54. GRB 050408: SOAR UBVRc Observations
  55. GRB 050408: Properties of the Host Galaxy
  56. GRB 050408: Mercator Optical Observations
  57. GRB050408: Radio Observations
  58. GRB 050408: Swift XRT analysis
  59. GRB 050408, SMARTS optical/IR afterglow observations
  60. GRB 050408: Optical limit at 20 min after the burst
  61. GRB 050408, optical observations
  62. GRB 050408: Moderate-resolution Gemini Spectroscopy
  63. GRB 050408,optical observation
  64. GRB 050408 Optical Observations
  65. GRB 050408: Emission and absorption redshift
  66. GRB 050408: Mercator Optical Observations
  67. GRB 050408: Magellan astrometry and photometry
  68. GRB 050408: First Optical observations with TFOSC at the RTT150
  69. GRB 050408: steepening of the optical decay
  70. GRB 050408: Optical afterglow confirmed
  71. GRB 050408: opitcal observation
  72. GRB 050408, optical observations
  73. GRB 050408 optical candidate
  74. GRB 050408: Swift XRT Position
  75. GRB 050408: ROTSE-III Optical Limits
  76. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  77. GRB050408: MASTER optical observations
  78. GRB050401: Radio Detection
  79. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  80. GRB 050406: Magellan optical observations
  81. GRB 050406: early Swift XRT analysis results
  82. GRB 050406 BAT refined analysis
  83. GRB 050406: Early observations with Swift-UVOT
  84. GRB 050406: Swift XRT Position
  85. Swift-BAT detection of GRB 050406
  86. Konus-Wind observation of GRB 050401
  87. GRB050401: Radio observation at 610 MHz with GMRT
  88. GRB 050401: VLT spectroscopic redshift
  89. GRB 050401 Optical Observations
  90. GRB 050401 BAT refined analysis
  91. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  92. GRB050401: TNG R-band observation
  93. GRB 050402A: IR Analysis
  94. GRB 050402A: IR Observations
  95. GRB 050402: Early observations with Swift-UVOT
  96. Swift Trigger 113225: P60 Observations
  97. GRB 050401: Optical afterglow confirmed
  98. GRB 050401: Optical afterglow candidate
  99. Swift-BAT detection of GRB 050401
  100. GRB 050401: Prompt XRT position

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