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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"

37766 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. GRB 050904: TAROT optical measurements
  10. GRB050904: Optical Observations
  11. GRB 050904: Environmental Constraints
  12. GRB 050904: Possible High-Redshift GRB
  13. GRB 050904: SOAR/PROMPT Observations
  14. GRB 050904: TAROT optical limits
  15. Swift-BAT triggers 153461-153465 are not GRBs
  16. GRB 050824: MDM Observations
  17. GRB 050827: Swift XRT preliminary analysis results
  18. IBAS Alerts 2641 and 2642: not a real GRB
  19. Swift Trigger #152652 is not a GRB
  20. GRB 050827 : OSN 1.5m optical observations
  21. GRB 050827: P200 NIR Observations
  22. GRB 050827: Optical Limit
  23. GRB 050827: XRT possible afterglow detection
  24. GRB 050826 : Lulin R band observation
  25. GRB050824: Maidanak optical limits
  26. GRB050820A: RTT150 optical observations
  27. GRB050827: RTT150 optical observations
  28. GRB 050827: Swift-BAT refined analysis
  29. GRB 050826: Optical Candidate
  30. GRB050824, HETE-2 Observation
  31. GRB 050826: Swift XRT preliminary analysis results
  32. GRB 050826: BAT refined analysis
  33. GRB050824: First 2 hours of power low optical decay?
  34. GRB 050826: Swift XRT position
  35. GRB050826: Swift-BAT detection of a long burst
  36. GRB050824: MASTER final analysis of the OT observations
  37. Possible GRB050825:MASTER optical observations
  38. Swift-BAT trigger 152038 is definitely not a GRB
  39. Swift-BAT trigger 152038 is probably not a GRB
  40. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  41. GRB050824, I-band imaging
  42. GRB050824: Radio Observations
  43. GRB 050824: Spectroscopic redshift from the VLT
  44. GRB 050822: refined XRT analysis
  45. GRB 050824: XRT refined analysis and possible afterglow detection
  46. GRB 050824: BAT refined analysis of a soft weak burst
  47. GRB050824: MASTER:OT decay
  48. GRB050824: MASTER observation OT
  49. GRB050805a: MASTER optical candidat
  50. GRB 050824: ROTSE-III Optical Limits
  51. GRB050824: Swift-BAT detection of a burst
  52. GRB 050824 optical candidate
  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. GRB 050820A BAT observations of second, larger episode of emission
  59. GRB050813: Maidanak I-band observations
  60. GRB 050822: Swift-BAT refined analysis
  61. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  62. GRB050820B at FRAM
  63. GRB050820A: RTT150 optical observations
  64. GRB 050820a - corrections to GCN 3846
  65. Swift/UVOT UV Photometry of GRB 050820B
  66. GRB 050822: ROTSE-III Prompt Optical Limits
  67. GRB 050822: Swift detection of a long burst
  68. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  69. GRB050820A: Radio Observation
  70. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  71. GRB050820a BVRcIc field photometry
  72. GRB 050820a: NIR Observations by WIRO
  73. GRB 050820B: Swift XRT position
  74. GRB050820B: Refined analysis of the Swift-BAT burst
  75. GRB050820B: BAT-Swift detection of a bright GRB
  76. GRB050820: refined XRT analysis
  77. GRB 050820: Early RAPTOR detections
  78. GRB 050820 Swift-BAT refined analysis
  79. GRB 050820: P60 Temporal Decay Index
  80. GRB 050820: High Resolution Spectroscopy from Keck
  81. GRB050819: RTT150 optical observations
  82. GRB 050820: Swift detection of a GRB
  83. GRB 050819 Swift-BAT refined analysis
  84. GRB050819: Swift XRT position
  85. GRB050819: Swift-BAT detection of a weak burst
  86. Swift-BAT trigger 150993 is not a GRB
  87. Swift Trigger 150823 is HETE J1900.1-2455
  88. GRB 050817: Optical observations
  89. GRB 050815: Radio Observation
  90. GRB050814: Radio Observation
  91. GRB050817: Negative Optical Observations
  92. GRB 050814: continued fading
  93. GRB 050813: Radio Observations
  94. GRB050815: Refined analysis of the Swift-BAT burst
  95. GRB 050815: ROTSE-III Optical Limits
  96. GRB050815: Swift XRT afterglow localization
  97. GRB 050730: Third Epoch WSRT Radio Observations
  98. GRB050814: Fading red source
  99. GRB 050813: Gemini Spectra Revisited
  100. GRB 050813: Non-fading of afterglow candidate

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