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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"

32763 results found.

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

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