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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

39320 results found.

  1. GRB050126: MASTER optical observations
  2. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  3. GRB 050126: Prompt XRT detection and localization
  4. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  5. GRB 050124, SMARTS optical/IR observations
  6. GRB 050117a: Radio Observations
  7. GRB 050124 I-band observation
  8. GRB 050124: NIR Candidates from Keck/NIRC
  9. GRB050124,optical observation
  10. GRB 050124 : Lulin R-band follow-up observation
  11. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  12. GRB050124: Swift-BAT position of a double-peaked burst
  13. GRB 050123 : I-band follow-up observation
  14. GRB050123: optical limit 1.8h before GRB
  15. GRB050123,optical observation
  16. GRB 050123: KAIT observations
  17. GRB050123: P60 Observations
  18. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  19. CFHTLS optical transient unlikely to be a GRB
  20. Unusual optical transient (GRB ???)
  21. GRB050117a: Radio Observations
  22. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  23. GRB050117b: Swift-BAT detection of a weak burst
  24. GRB 050117, I-band observations
  25. GRB 050117: Optical observation
  26. GRB050117: Refined XRT position
  27. GRB050117: MASTER optical observations
  28. MASTER:GRB050117 SWIFT
  29. GRB050117: Swift-BAT detection of a long multi-peaked burst
  30. GRB050117: Swift XRT Position
  31. Triangulation of Short Hard GRB050112 (large error box)
  32. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  33. SGR 1806-20 and extragalactic short-duration GRBs
  34. SGR 1806-20: Temporal and Spectral behavior of radio transient
  35. SGR 1806-20, RHESSI observations of the 041227 giant flare
  36. SGR1806: Detection of a Sudden Ionospheric Disturbance
  37. GRB 041217: Optical observations
  38. GRB041219, early time observations
  39. IPN localization of giant flare from SGR1806-20
  40. GRB041228: ROTSE-III Optical Observations
  41. GRB041228: Swift-BAT detection of a burst
  42. GRB041219; RXTE ASM Observations
  43. NIR Observations of GRB 041219
  44. GRB041226: ROTSE-III Optical Observations
  45. GRB041226: Swift-BAT detection of a burst
  46. GRB041223: decay of the afterglow
  47. GRB041224: ROTSE-III Optical Observations
  48. GRB 041224: near-infrared observations with REM
  49. GRB 041223: XRT afterglow spectrum and light curve
  50. GRB 041223 Fluence measured by Swift-BAT
  51. GRB041224: Swift-BAT detection of a soft burst
  52. GRB041223: optical and NIR observations with REM
  53. Swift-BAT Time History of GRB041219
  54. GRB 041219: TAROT optical observations
  55. GRB 041218: TAROT optical observations
  56. GRB 041223: J-band observations of the afterglow
  57. GRB 041223: Detection of Optical Transient with LCO40
  58. GRB 041219c: PROMPT Observations
  59. GRB041223: ROTSE-III Optical Observations
  60. GRB041223: Swift-BAT detection of a bright long burst
  61. GRB 041218: optical observations
  62. GRB 041219: Second Epoch WSRT Radio Observations
  63. GRB 041219: WSRT Radio Afterglow Detection
  64. GRB 041219: Keck IR Observations and Astrometric Refinement of the
  65. GRB 041218: Optical observations
  66. GRB 041219 : optical follow-up observations
  67. GRB041220: Swift-BAT burst
  68. Deep RAPTOR observations during GRB 041219
  69. GRB 041218 Optical Observations
  70. GRB 041219 Optical Observations
  71. GRB041219c: Third Burst in One Day from Swift-BAT
  72. GRB041219: Optical Afterglow Detection
  73. GRB041219: Continued NIR Observations
  74. GRB041219b: A Swift-BAT burst
  75. GRB 041219 ,optical observation
  76. GRB 041219: Radio Afterglow Detection
  77. GRB 041218 : Radio Observations
  78. GRB 041218: R-band optical observations
  79. GRB041219: Confirmed NIR Afterglow
  80. GRB041218: Continued P60 Optical Observations
  81. Swift-BAT detection of the bright long burst GRB041219
  82. GRB 041218: Optical Observation
  83. GRB 041219: Infrared Afterglow Candidate
  84. GRB041219, BVRcIc field calibration
  85. GRB 041219: Infrared Afterglow Candidate
  86. GRB041218, BVRcIc field calibration
  87. GRB041219: Prompt Optical Observations from ROTSE-IIIb
  88. GRB041219: P60 Optical Observations
  89. GRB 041219 - A long GRB detected by INTEGRAL
  90. GRB 041219: PAIRITEL IR Observations, < 3 minutes after trigger
  91. GRB 041217: PROMPT Observations
  92. GRB041218: optical observations
  93. GRB041217: optical limit 30 min after GRB
  94. GRB 041218; optical candidate
  95. GRB 041218: Optical observations
  96. GRB 041217: LCO40 Optical Observations and Possible Candidates
  97. GRB 041218 - A long GRB detected by integral
  98. GRB041217: Optical Observations
  99. GRB041217: P60 Optical Observations
  100. GRB041217: Infrared Observations

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