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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"

32770 results found.

  1. GRB 050906: Radio Observations
  2. GRB 050904: Keck I-band Imaging
  3. GRB050906: P60 Observations
  4. GRB 050904: more VLT NIR observations
  5. GRB 050904: BOOTES early R-band observation
  6. GRB 050906: Bright galaxy in BAT error box
  7. GRB 050906: Swift/BAT Detection of a possible burst
  8. GRB 050904: More SOAR
  9. GRB 050904: photometric redshift
  10. GRB 050904: Swift/UVOT observations
  11. GRB 050904: Afterglow Astrometry
  12. GRB 050904: NIR object inside the XRT error box
  13. GRB 050904: early Swift XRT analysis results
  14. GRB 050904: SOAR YJ and PROMPT Ic Observations
  15. GRB 050904: BAT refined analysis of partial data set
  16. GRB050904: Optical Observations
  17. GRB 050904: Environmental Constraints
  18. GRB 050904: Possible High-Redshift GRB
  19. GRB 050904: SOAR/PROMPT Observations
  20. GRB050904: P60 Observations
  21. GRB 050904: TAROT optical limits
  22. GRB 050824: MDM Observations
  23. GRB 050827: Swift XRT preliminary analysis results
  24. GRB 050827 : OSN 1.5m optical observations
  25. GRB 050827: P200 NIR Observations
  26. GRB050827: Swift/UVOT upper limits
  27. GRB 050827: Optical Limit
  28. GRB 050827: XRT possible afterglow detection
  29. GRB 050826 : Lulin R band observation
  30. GRB050824: Maidanak optical limits
  31. GRB050820A: RTT150 optical observations
  32. GRB050827: RTT150 optical observations
  33. GRB 050827: Swift-BAT refined analysis
  34. GRB 050826: Optical Candidate
  35. GRB050824, HETE-2 Observation
  36. GRB 050826: Swift XRT preliminary analysis results
  37. GRB 050826: BAT refined analysis
  38. GRB050826: Swift/UVOT early upper limits
  39. GRB050824: First 2 hours of power low optical decay?
  40. GRB 050826: Swift XRT position
  41. GRB050824: MASTER final analysis of the OT observations
  42. GRB050824: CORRECTION to UVOT observing times
  43. GRB050824: Swift/UVOT detection of fading afterglow
  44. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  45. GRB050824: Radio Observations
  46. GRB 050824: Spectroscopic redshift from the VLT
  47. GRB 050822: refined XRT analysis
  48. GRB 050824: BAT refined analysis of a soft weak burst
  49. GRB050824: MASTER:OT decay
  50. GRB050824: MASTER observation OT
  51. GRB050805a: MASTER optical candidat
  52. GRB 050824: ROTSE-III Optical Limits
  53. GRB050820A: RTT150 optical observations
  54. GRB050820a: PROMPT RcIc Observations
  55. GRB050815: Maidanak optical observation
  56. XRF050509c: Radio upper limits from GMRT
  57. VLT/UVES spectroscopy of GRB050820
  58. GRB050822: Swift/UVOT upper limits
  59. GRB 050820A BAT observations of second, larger episode of emission
  60. GRB050813: Maidanak I-band observations
  61. GRB 050822: Swift-BAT refined analysis
  62. GRB050820A: RTT150 optical observations
  63. GRB 050820a - corrections to GCN 3846
  64. Swift/UVOT UV Photometry of GRB 050820B
  65. GRB 050822: ROTSE-III Prompt Optical Limits
  66. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  67. GRB050820A: Radio Observation
  68. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  69. GRB050820a BVRcIc field photometry
  70. GRB 050820a: NIR Observations by WIRO
  71. GRB 050820B: Swift XRT position
  72. GRB050820B: Refined analysis of the Swift-BAT burst
  73. Swift/UVOT photometry of GRB050820
  74. GRB050820: refined XRT analysis
  75. GRB 050820: Early RAPTOR detections
  76. GRB 050820 Swift-BAT refined analysis
  77. GRB 050820: P60 Temporal Decay Index
  78. GRB 050820: High Resolution Spectroscopy from Keck
  79. GRB050819: refined XRT analysis
  80. GRB050819: RTT150 optical observations
  81. GRB 050820: Swift detection of a GRB
  82. GRB 050819 Swift-BAT refined analysis
  83. GRB050819: Swift XRT position
  84. Swift-BAT trigger 150993 is not a GRB
  85. Swift Trigger 150823 is HETE J1900.1-2455
  86. GRB 050817: Optical observations
  87. GRB 050815: Radio Observation
  88. GRB050814: Radio Observation
  89. GRB050817: Negative Optical Observations
  90. GRB 050814: continued fading
  91. GRB050815: XRT refined analysis
  92. GRB 050813: Radio Observations
  93. GRB050815: Refined analysis of the Swift-BAT burst
  94. GRB 050815: ROTSE-III Optical Limits
  95. GRB050815: Swift XRT afterglow localization
  96. GRB 050730: Third Epoch WSRT Radio Observations
  97. GRB050814: Fading red source
  98. GRB 050813: Gemini Spectra Revisited
  99. GRB050814: P60 Optical Afterglow Candidate
  100. GRB 050813: Non-fading of afterglow candidate

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