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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"

41912 results found.

  1. GRB 050827: P200 NIR Observations
  2. GRB050827: Swift/UVOT upper limits
  3. GRB 050827: Optical Limit
  4. GRB 050827: XRT possible afterglow detection
  5. GRB 050826 : Lulin R band observation
  6. GRB050824: Maidanak optical limits
  7. GRB050820A: RTT150 optical observations
  8. GRB050827: RTT150 optical observations
  9. GRB 050827: Swift-BAT refined analysis
  10. GRB050827: Swift-BAT detection of a burst
  11. Subaru Observations of GRB050724
  12. GRB 050826: Optical Candidate
  13. GRB050824, HETE-2 Observation
  14. GRB 050826: Swift XRT preliminary analysis results
  15. GRB 050826: BAT refined analysis
  16. GRB050826: Swift/UVOT early upper limits
  17. GRB050824: First 2 hours of power low optical decay?
  18. GRB 050826: Swift XRT position
  19. GRB050826: Swift-BAT detection of a long burst
  20. GRB050824: MASTER final analysis of the OT observations
  21. Possible GRB050825:MASTER optical observations
  22. GRB050824: CORRECTION to UVOT observing times
  23. GRB050824: Swift/UVOT detection of fading afterglow
  24. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  25. GRB050824, I-band imaging
  26. GRB050824: Radio Observations
  27. GRB 050822: refined XRT analysis
  28. GRB 050824: XRT refined analysis and possible afterglow detection
  29. GRB 050824: BAT refined analysis of a soft weak burst
  30. GRB050824: MASTER:OT decay
  31. GRB050824: MASTER observation OT
  32. GRB050805a: MASTER optical candidat
  33. GRB 050824: ROTSE-III Optical Limits
  34. GRB050824: Swift-BAT detection of a burst
  35. GRB 050824 optical candidate
  36. GRB050820A: RTT150 optical observations
  37. GRB050820a: PROMPT RcIc Observations
  38. GRB050815: Maidanak optical observation
  39. XRF050509c: Radio upper limits from GMRT
  40. VLT/UVES spectroscopy of GRB050820
  41. GRB050822: Swift/UVOT upper limits
  42. GRB 050820A BAT observations of second, larger episode of emission
  43. GRB050813: Maidanak I-band observations
  44. GRB 050822: Swift-BAT refined analysis
  45. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  46. GRB050820A: RTT150 optical observations
  47. GRB 050820a - corrections to GCN 3846
  48. GRB 050822: ROTSE-III Prompt Optical Limits
  49. GRB 050822: Swift detection of a long burst
  50. GRB050820A: Radio Observation
  51. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  52. GRB050820a BVRcIc field photometry
  53. GRB 050820a: NIR Observations by WIRO
  54. GRB 050820B: Swift XRT position
  55. GRB050820B: Refined analysis of the Swift-BAT burst
  56. GRB050820B: BAT-Swift detection of a bright GRB
  57. Swift/UVOT photometry of GRB050820
  58. GRB050820: refined XRT analysis
  59. GRB 050820 Swift-BAT refined analysis
  60. GRB 050820: P60 Temporal Decay Index
  61. GRB 050820: High Resolution Spectroscopy from Keck
  62. GRB050819: refined XRT analysis
  63. GRB050819: RTT150 optical observations
  64. GRB 050820: Swift detection of a GRB
  65. GRB050820: Optical afterglow from P60
  66. GRB 050819 Swift-BAT refined analysis
  67. GRB050819: Swift XRT position
  68. GRB050819: Swift-BAT detection of a weak burst
  69. Swift-BAT trigger 150993 is not a GRB
  70. Swift Trigger 150823 is HETE J1900.1-2455
  71. GRB 050817: Optical observations
  72. GRB 050815: Radio Observation
  73. GRB050814: Radio Observation
  74. GRB050817: Negative Optical Observations
  75. GRB050817: Swift-BAT Detection of a burst
  76. GRB 050814: continued fading
  77. GRB050815: Optical afterglow detection by Swift UVOT
  78. GRB050815: XRT refined analysis
  79. GRB 050813: Radio Observations
  80. GRB050815: Refined analysis of the Swift-BAT burst
  81. GRB050815: Swift-BAT detection of a burst
  82. GRB 050730: Third Epoch WSRT Radio Observations
  83. GRB 050813: Gemini Spectra Revisited
  84. GRB050814: P60 Optical Afterglow Candidate
  85. GRB 050813: Non-fading of afterglow candidate
  86. GRB 050814: XRT refined analysis
  87. GRB050814: SWIFT/UVOT observation
  88. GRB050814: Refined analysis of the Swift-BAT burst
  89. GRB050813: Gemini Imaging
  90. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  91. GRB 050814: Swift detection of a burst
  92. GRB 050813: Magellan detection of a high redshift galaxy cluster
  93. GRB050813: RTT150 optical observations
  94. GRB 050813: I-band observations
  95. GRB050813, SDSS pre-burst observations
  96. GRB 050813: KAIT optical limit
  97. GRB050813: SWIFT/UVOT observation
  98. GRB 050813: Swift XRT afterglow localization
  99. RBO GRB 050714A and GRB 050716 observations
  100. GRB 050813: Possible Short Swift-BAT GRB

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