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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"

26559 results found.

  1. GRB 050908: Swift-BAT refined analysis
  2. GRB 050908: Optical observations
  3. GRB 050908: Swift detection of a burst
  4. GRB 050906: Optical observations at the Very Large Telescope
  5. GRB 050904 BAT refined analysis of complete data set
  6. GRB 050904: Subaru Optical Spectroscopy
  7. GRB 050906: MARGE Optical Limits
  8. GRB 050906: Swift XRT upper limit
  9. GRB 050904: Keck I-band Imaging
  10. GRB050906: P60 Observations
  11. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  12. GRB 050904: More SOAR
  13. GRB 050904: photometric redshift
  14. GRB 050904: Swift/UVOT observations
  15. GRB 050904: NIR object inside the XRT error box
  16. GRB 050904: early Swift XRT analysis results
  17. GRB 050904: BAT refined analysis of partial data set
  18. GRB050904: Optical Observations
  19. GRB050904: P60 Observations
  20. GRB 050904: TAROT optical limits
  21. GRB 050827: Swift XRT preliminary analysis results
  22. GRB 050827 : OSN 1.5m optical observations
  23. GRB 050827: P200 NIR Observations
  24. GRB050827: Swift/UVOT upper limits
  25. GRB 050827: Optical Limit
  26. GRB 050827: XRT possible afterglow detection
  27. GRB050824: Maidanak optical limits
  28. GRB050827: RTT150 optical observations
  29. GRB 050827: Swift-BAT refined analysis
  30. GRB050827: Swift-BAT detection of a burst
  31. Subaru Observations of GRB050724
  32. GRB050824, HETE-2 Observation
  33. GRB 050826: Swift XRT preliminary analysis results
  34. GRB 050826: BAT refined analysis
  35. GRB050826: Swift/UVOT early upper limits
  36. GRB050824: First 2 hours of power low optical decay?
  37. GRB050826: Swift-BAT detection of a long burst
  38. GRB050824: CORRECTION to UVOT observing times
  39. Swift-BAT trigger 152038 is probably not a GRB
  40. GRB050824: Swift/UVOT detection of fading afterglow
  41. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  42. GRB050824, I-band imaging
  43. GRB 050822: refined XRT analysis
  44. GRB 050824: XRT refined analysis and possible afterglow detection
  45. GRB 050824: BAT refined analysis of a soft weak burst
  46. GRB050824: MASTER:OT decay
  47. GRB050824: MASTER observation OT
  48. GRB050805a: MASTER optical candidat
  49. XRF050509c: Radio upper limits from GMRT
  50. GRB050822: Swift/UVOT upper limits
  51. GRB 050820A BAT observations of second, larger episode of emission
  52. GRB050813: Maidanak I-band observations
  53. GRB 050822: Swift-BAT refined analysis
  54. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  55. GRB050820B at FRAM
  56. Swift/UVOT UV Photometry of GRB 050820B
  57. GRB 050822: Swift detection of a long burst
  58. GRB050820a BVRcIc field photometry
  59. GRB050820B XMM-Newton observation
  60. GRB 050820a: NIR Observations by WIRO
  61. GRB 050820B: Swift XRT position
  62. GRB050820B: Refined analysis of the Swift-BAT burst
  63. GRB050820B: BAT-Swift detection of a bright GRB
  64. GRB050820: refined XRT analysis
  65. GRB 050820 Swift-BAT refined analysis
  66. GRB050819: refined XRT analysis
  67. GRB 050820: Swift detection of a GRB
  68. GRB 050819 Swift-BAT refined analysis
  69. GRB050819: Swift-BAT detection of a weak burst
  70. GRB 050817: Optical observations
  71. GRB050817: Swift-BAT Detection of a burst
  72. GRB 050814: continued fading
  73. GRB050815: XRT refined analysis
  74. GRB050815: Refined analysis of the Swift-BAT burst
  75. GRB 050815: ROTSE-III Optical Limits
  76. GRB050815: Swift-BAT detection of a burst
  77. GRB050814: Fading red source
  78. GRB050814: P60 Optical Afterglow Candidate
  79. GRB 050813: Non-fading of afterglow candidate
  80. GRB 050814: XRT refined analysis
  81. GRB050814: SWIFT/UVOT observation
  82. GRB050814: Refined analysis of the Swift-BAT burst
  83. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  84. GRB 050814: Swift XRT Afterglow Localization
  85. GRB 050814: Swift detection of a burst
  86. GRB 050813: Magellan detection of a high redshift galaxy cluster
  87. GRB050813, SDSS pre-burst observations
  88. GRB050813: SWIFT/UVOT observation
  89. GRB 050813: Swift XRT afterglow localization
  90. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  91. GRB 050730: WSRT Radio Observations
  92. GRB050805b: CrAO optical limit
  93. GRB050805a : Null detection report
  94. GRB050730, optical observations
  95. GRB050803, optical observations
  96. Retraction of Swift Trigger 149131 (GRB 050805B)
  97. GRB 050805b: OHP optical limits
  98. GRB 050805b: TAROT optical limits
  99. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  100. GRB050805a: MASTER optical candidat

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