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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"

38666 results found.

  1. GRB 050908: Optical observations
  2. Gemini Spectroscopy of GRB 050908
  3. GRB 050908: spectroscopic redshift
  4. GRB 050908: Prompt PROMPT Observations
  5. GRB 050908 : Swift XRT position
  6. GRB 050908: KAIT observations
  7. GRB 050908: P60 Confirmation of Optical Afterglow
  8. GRB 050908: Swift detection of a burst
  9. Swift trigger 154073 is not a GRB
  10. GRB 050906: Optical observations at the Very Large Telescope
  11. GRB050904: CrAO optical observations
  12. GRB 050904 BAT refined analysis of complete data set
  13. GRB 050904: Subaru Optical Spectroscopy
  14. GRB 050906: MARGE Optical Limits
  15. GRB 050906: Swift-BAT refined analysis
  16. GRB 050906: Swift XRT upper limit
  17. GRB 050906: Radio Observations
  18. GRB 050904: Keck I-band Imaging
  19. GRB050906: P60 Observations
  20. GRB 050904: more VLT NIR observations
  21. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  22. GRB 050906: Swift/BAT Detection of a possible burst
  23. GRB 050904: More SOAR
  24. GRB 050904: photometric redshift
  25. GRB 050904: Swift/UVOT observations
  26. GRB 050904: Afterglow Astrometry
  27. GRB 050904: NIR object inside the XRT error box
  28. GRB 050904: early Swift XRT analysis results
  29. GRB 050904: SOAR YJ and PROMPT Ic Observations
  30. GRB 050904: BAT refined analysis of partial data set
  31. GRB050904: Optical Observations
  32. GRB 050904: Environmental Constraints
  33. GRB 050904: Possible High-Redshift GRB
  34. GRB 050904: SOAR/PROMPT Observations
  35. GRB050904: P60 Observations
  36. GRB050904: Swift-BAT detection of a probable burst
  37. Swift-BAT triggers 153461-153465 are not GRBs
  38. Retraction of Swift-BAT trigger #153355
  39. GRB 050824: MDM Observations
  40. GRB 050827: Swift XRT preliminary analysis results
  41. IBAS Alerts 2641 and 2642: not a real GRB
  42. Swift Trigger #152652 is not a GRB
  43. GRB 050827 : OSN 1.5m optical observations
  44. GRB 050827: P200 NIR Observations
  45. GRB050827: Swift/UVOT upper limits
  46. GRB 050827: Optical Limit
  47. GRB 050827: XRT possible afterglow detection
  48. GRB 050826 : Lulin R band observation
  49. GRB050824: Maidanak optical limits
  50. GRB 050827: Swift-BAT refined analysis
  51. GRB050827: Swift-BAT detection of a burst
  52. Subaru Observations of GRB050724
  53. GRB 050826: Optical Candidate
  54. GRB050824, HETE-2 Observation
  55. GRB 050826: Swift XRT preliminary analysis results
  56. GRB 050826: BAT refined analysis
  57. GRB050826: Swift/UVOT early upper limits
  58. GRB 050826: Swift XRT position
  59. GRB050826: Swift-BAT detection of a long burst
  60. Possible GRB050825:MASTER optical observations
  61. Swift-BAT trigger 152038 is definitely not a GRB
  62. GRB050824: CORRECTION to UVOT observing times
  63. Swift-BAT trigger 152038 is probably not a GRB
  64. GRB050824: Swift/UVOT detection of fading afterglow
  65. GRB050824, I-band imaging
  66. GRB050824: Radio Observations
  67. GRB 050824: Spectroscopic redshift from the VLT
  68. GRB 050822: refined XRT analysis
  69. GRB 050824: XRT refined analysis and possible afterglow detection
  70. GRB 050824: BAT refined analysis of a soft weak burst
  71. GRB050824: MASTER:OT decay
  72. GRB050824: MASTER observation OT
  73. GRB050805a: MASTER optical candidat
  74. GRB 050824: ROTSE-III Optical Limits
  75. GRB050824: Swift-BAT detection of a burst
  76. GRB 050824 optical candidate
  77. GRB050820A: RTT150 optical observations
  78. GRB050820a: PROMPT RcIc Observations
  79. GRB050815: Maidanak optical observation
  80. XRF050509c: Radio upper limits from GMRT
  81. GRB050822: Swift/UVOT upper limits
  82. GRB 050820A BAT observations of second, larger episode of emission
  83. GRB050813: Maidanak I-band observations
  84. GRB 050822: Swift-BAT refined analysis
  85. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  86. GRB050820A: RTT150 optical observations
  87. GRB 050820a - corrections to GCN 3846
  88. Swift/UVOT UV Photometry of GRB 050820B
  89. GRB 050822: ROTSE-III Prompt Optical Limits
  90. GRB 050822: Swift detection of a long burst
  91. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  92. GRB050820A: Radio Observation
  93. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  94. GRB050820a BVRcIc field photometry
  95. GRB050820B XMM-Newton observation
  96. GRB 050820B: Swift XRT position
  97. GRB050820B: Planned XMM-Newton observation
  98. GRB050820B: Refined analysis of the Swift-BAT burst
  99. GRB050820B: BAT-Swift detection of a bright GRB
  100. Swift/UVOT photometry of GRB050820

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