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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"

38172 results found.

  1. GRB 050904: Keck I-band Imaging
  2. GRB 050904: more VLT NIR observations
  3. GRB 050904: BOOTES early R-band observation
  4. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  5. GRB 050906: Bright galaxy in BAT error box
  6. GRB 050906: Swift/BAT Detection of a possible burst
  7. GRB 050904: More SOAR
  8. GRB 050904: photometric redshift
  9. GRB 050904: Swift/UVOT observations
  10. GRB 050904: Afterglow Astrometry
  11. GRB 050904: NIR object inside the XRT error box
  12. GRB 050904: early Swift XRT analysis results
  13. GRB 050904: SOAR YJ and PROMPT Ic Observations
  14. GRB 050904: BAT refined analysis of partial data set
  15. GRB 050904: TAROT optical measurements
  16. GRB050904: Optical Observations
  17. GRB 050904: Environmental Constraints
  18. GRB 050904: Possible High-Redshift GRB
  19. GRB 050904: SOAR/PROMPT Observations
  20. GRB 050904: TAROT optical limits
  21. Swift-BAT triggers 153461-153465 are not GRBs
  22. GRB 050824: MDM Observations
  23. GRB 050827: Swift XRT preliminary analysis results
  24. IBAS Alerts 2641 and 2642: not a real GRB
  25. Swift Trigger #152652 is not a GRB
  26. GRB 050827 : OSN 1.5m optical observations
  27. GRB 050827: P200 NIR Observations
  28. GRB 050827: Optical Limit
  29. GRB 050827: XRT possible afterglow detection
  30. GRB 050826 : Lulin R band observation
  31. GRB050824: Maidanak optical limits
  32. GRB050820A: RTT150 optical observations
  33. GRB050827: RTT150 optical observations
  34. GRB 050827: Swift-BAT refined analysis
  35. GRB 050826: Optical Candidate
  36. GRB050824, HETE-2 Observation
  37. GRB 050826: Swift XRT preliminary analysis results
  38. GRB 050826: BAT refined analysis
  39. GRB050824: First 2 hours of power low optical decay?
  40. GRB 050826: Swift XRT position
  41. GRB050826: Swift-BAT detection of a long burst
  42. GRB050824: MASTER final analysis of the OT observations
  43. Possible GRB050825:MASTER optical observations
  44. Swift-BAT trigger 152038 is definitely not a GRB
  45. Swift-BAT trigger 152038 is probably not a GRB
  46. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  47. GRB050824, I-band imaging
  48. GRB050824: Radio Observations
  49. GRB 050824: Spectroscopic redshift from the VLT
  50. GRB 050822: refined XRT analysis
  51. GRB 050824: XRT refined analysis and possible afterglow detection
  52. GRB 050824: BAT refined analysis of a soft weak burst
  53. GRB050824: MASTER:OT decay
  54. GRB050824: MASTER observation OT
  55. GRB050805a: MASTER optical candidat
  56. GRB 050824: ROTSE-III Optical Limits
  57. GRB050824: Swift-BAT detection of a burst
  58. GRB 050824 optical candidate
  59. GRB050820A: RTT150 optical observations
  60. GRB050820a: PROMPT RcIc Observations
  61. GRB050815: Maidanak optical observation
  62. XRF050509c: Radio upper limits from GMRT
  63. VLT/UVES spectroscopy of GRB050820
  64. GRB 050820A BAT observations of second, larger episode of emission
  65. GRB050813: Maidanak I-band observations
  66. GRB 050822: Swift-BAT refined analysis
  67. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  68. GRB050820B at FRAM
  69. GRB050820A: RTT150 optical observations
  70. GRB 050820a - corrections to GCN 3846
  71. Swift/UVOT UV Photometry of GRB 050820B
  72. GRB 050822: ROTSE-III Prompt Optical Limits
  73. GRB 050822: Swift detection of a long burst
  74. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  75. GRB050820A: Radio Observation
  76. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  77. GRB050820a BVRcIc field photometry
  78. GRB 050820a: NIR Observations by WIRO
  79. GRB 050820B: Swift XRT position
  80. GRB050820B: Refined analysis of the Swift-BAT burst
  81. GRB050820B: BAT-Swift detection of a bright GRB
  82. GRB050820: refined XRT analysis
  83. GRB 050820: Early RAPTOR detections
  84. GRB 050820 Swift-BAT refined analysis
  85. GRB 050820: P60 Temporal Decay Index
  86. GRB 050820: High Resolution Spectroscopy from Keck
  87. GRB050819: RTT150 optical observations
  88. GRB 050820: Swift detection of a GRB
  89. GRB 050819 Swift-BAT refined analysis
  90. GRB050819: Swift XRT position
  91. GRB050819: Swift-BAT detection of a weak burst
  92. Swift-BAT trigger 150993 is not a GRB
  93. Swift Trigger 150823 is HETE J1900.1-2455
  94. GRB 050817: Optical observations
  95. GRB 050815: Radio Observation
  96. GRB050814: Radio Observation
  97. GRB050817: Negative Optical Observations
  98. GRB 050814: continued fading
  99. GRB 050813: Radio Observations
  100. GRB050815: Refined analysis of the Swift-BAT burst

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