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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"

20411 results found.

  1. GRB 050915B: Swift/UVOT Upper Limits
  2. GRB 050915a: IR Transient
  3. GRB 050915b, SMARTS optical/IR observations
  4. GRB050915B: Swift-BAT detection of a long bright burst
  5. GRB050915: Swift/UVOT upper limits
  6. GRB 050915: IR Observations
  7. GRB050915: P60 Optical Observations
  8. GRB 050915: Swift detection of a GRB
  9. GRB050911: Upper limit on X-ray afterglow
  10. Swift-BAT trigger 155072 ground analysis
  11. Swift-BAT trigger 155072 is probably not a GRB
  12. GRB 050911: z~0.16 cluster in the field
  13. GRB050911: Swift-BAT detection of a long burst
  14. GRB 050910a: TAROT early optical limits
  15. WIRO observations in I of GRB 050908
  16. GRB 050906: Possible X-ray Counterpart
  17. GRB050908: Swift/UVOT Early upper limits
  18. GRB050908 : Swift-XRT refined analysis
  19. GRB 050908: Optical observations
  20. Gemini Spectroscopy of GRB 050908
  21. GRB 050908: Swift detection of a burst
  22. GRB 050906: Optical observations at the Very Large Telescope
  23. GRB050904: CrAO optical observations
  24. GRB 050904: Subaru Optical Spectroscopy
  25. GRB 050906: Swift XRT upper limit
  26. GRB 050904: Keck I-band Imaging
  27. GRB050906: P60 Observations
  28. GRB 050904: photometric redshift
  29. GRB 050904: Swift/UVOT observations
  30. GRB 050904: NIR object inside the XRT error box
  31. GRB050904: Optical Observations
  32. GRB050904: P60 Observations
  33. GRB 050904: TAROT optical limits
  34. GRB050904: Swift-BAT detection of a probable burst
  35. GRB 050827: P200 NIR Observations
  36. GRB050827: Swift/UVOT upper limits
  37. GRB050824: Maidanak optical limits
  38. GRB 050827: Swift-BAT refined analysis
  39. Subaru Observations of GRB050724
  40. GRB 050826: BAT refined analysis
  41. GRB050826: Swift/UVOT early upper limits
  42. GRB050826: Swift-BAT detection of a long burst
  43. GRB050824, I-band imaging
  44. XRF050509c: Radio upper limits from GMRT
  45. GRB050822: Swift/UVOT upper limits
  46. GRB050813: Maidanak I-band observations
  47. GRB 050822: Swift-BAT refined analysis
  48. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  49. GRB050820B at FRAM
  50. Swift/UVOT UV Photometry of GRB 050820B
  51. GRB 050822: Swift detection of a long burst
  52. GRB050820a BVRcIc field photometry
  53. GRB050820B XMM-Newton observation
  54. GRB 050820B: Swift XRT position
  55. GRB050820: refined XRT analysis
  56. GRB050819: refined XRT analysis
  57. GRB 050820: Swift detection of a GRB
  58. GRB 050819 Swift-BAT refined analysis
  59. GRB050819: Swift-BAT detection of a weak burst
  60. Swift Trigger 150823 is HETE J1900.1-2455
  61. GRB 050817: Optical observations
  62. GRB050817: Swift-BAT Detection of a burst
  63. GRB 050814: continued fading
  64. GRB050815: Refined analysis of the Swift-BAT burst
  65. GRB 050815: ROTSE-III Optical Limits
  66. GRB050815: Swift-BAT detection of a burst
  67. GRB050814: Fading red source
  68. GRB050814: P60 Optical Afterglow Candidate
  69. GRB 050813: Non-fading of afterglow candidate
  70. GRB 050814: XRT refined analysis
  71. GRB050814: SWIFT/UVOT observation
  72. GRB 050814: Swift XRT Afterglow Localization
  73. GRB 050814: Swift detection of a burst
  74. GRB 050813: Magellan detection of a high redshift galaxy cluster
  75. GRB050813, SDSS pre-burst observations
  76. GRB050813: SWIFT/UVOT observation
  77. GRB 050813: Swift XRT afterglow localization
  78. GRB050803: CrAO optical observations, no OT candidate
  79. GRB050805b: CrAO optical limit
  80. GRB050803, optical observations
  81. Retraction of Swift Trigger 149131 (GRB 050805B)
  82. GRB 050805b: OHP optical limits
  83. GRB 050805b: TAROT optical limits
  84. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  85. GRB050802: TNG optical observations
  86. GRB050803: Radio Observation
  87. GRB 050803: RTT150 optical observations
  88. GRB050801: Radio Observation
  89. GRB050730: Radio Detection
  90. GRB 050803: Keck Observations
  91. GRB 050802.422: Fading of the afterglow and detection of the host
  92. GRB 050803: TAROT optical limits
  93. GRB050803: Swift-BAT detection of a very long burst
  94. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  95. GRB 050802: Swift/UVOT optical and UV detections
  96. GRB050802 radio non-detection
  97. GRB 050730: OHP optical observations
  98. GRB050801: Optical photometry and decay index
  99. GRB 050802: Swift Gamma-ray Burst
  100. GCN 050801: early Swift XRT analysis results

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