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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"

36001 results found.

  1. GRB 050822: ROTSE-III Prompt Optical Limits
  2. GRB 050822: Swift detection of a long burst
  3. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  4. GRB050820A: Radio Observation
  5. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  6. GRB050820a BVRcIc field photometry
  7. GRB 050820a: NIR Observations by WIRO
  8. GRB 050820B: Swift XRT position
  9. GRB050820B: Refined analysis of the Swift-BAT burst
  10. GRB050820B: BAT-Swift detection of a bright GRB
  11. GRB050820: refined XRT analysis
  12. GRB 050820: Early RAPTOR detections
  13. GRB 050820 Swift-BAT refined analysis
  14. GRB 050820: P60 Temporal Decay Index
  15. GRB 050820: High Resolution Spectroscopy from Keck
  16. GRB050819: RTT150 optical observations
  17. GRB 050820: Swift detection of a GRB
  18. GRB 050819 Swift-BAT refined analysis
  19. GRB050819: Swift XRT position
  20. GRB050819: Swift-BAT detection of a weak burst
  21. Swift-BAT trigger 150993 is not a GRB
  22. Swift Trigger 150823 is HETE J1900.1-2455
  23. GRB 050817: Optical observations
  24. GRB 050815: Radio Observation
  25. GRB050814: Radio Observation
  26. GRB050817: Negative Optical Observations
  27. GRB 050814: continued fading
  28. GRB 050813: Radio Observations
  29. GRB050815: Refined analysis of the Swift-BAT burst
  30. GRB 050815: ROTSE-III Optical Limits
  31. GRB050815: Swift XRT afterglow localization
  32. GRB 050730: Third Epoch WSRT Radio Observations
  33. GRB050814: Fading red source
  34. GRB 050813: Gemini Spectra Revisited
  35. GRB 050813: Non-fading of afterglow candidate
  36. GRB 050814: XRT refined analysis
  37. GRB050814: Refined analysis of the Swift-BAT burst
  38. GRB050813: Gemini Imaging
  39. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  40. GRB 050814: Swift XRT Afterglow Localization
  41. GRB 050814: Swift detection of a burst
  42. GRB 050813: Magellan detection of a high redshift galaxy cluster
  43. GRB050813: RTT150 optical observations
  44. GRB 050813: I-band observations
  45. GRB050813, SDSS pre-burst observations
  46. GRB 050813: KAIT optical limit
  47. GRB 050813: Swift-BAT refined analysis
  48. GRB 050813: Photometry of object in XRT error circle
  49. GRB 050813: Swift XRT afterglow localization
  50. RBO GRB 050714A and GRB 050716 observations
  51. GRB 050813: Possible Short Swift-BAT GRB
  52. Swift-BAT trigger 150131 is not a GRB
  53. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  54. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  55. GRB050803: CrAO optical observations, no OT candidate
  56. GRB 050730: WSRT Radio Observations
  57. GRB 050803: PROMPT BVRcIc Observations
  58. GRB 050807: ROTSE-III Optical Limits
  59. GRB 050730, optical observation
  60. GRB050805b: CrAO optical limit
  61. GRB050805a : Null detection report
  62. GRB050730, optical observations
  63. GRB050803, optical observations
  64. Swift-BAT trigger 149118 is very likely not a GRB
  65. Retraction of Swift Trigger 149131 (GRB 050805B)
  66. GRB 050805b: OHP optical limits
  67. GRB 050805b: TAROT optical limits
  68. GRB050805b: MASTER optical observations
  69. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  70. GRB050805a: MASTER optical candidat
  71. Swift-BAT trigger 149118 is probably not a GRB
  72. GRB 050803: RTT150 optical observations
  73. GRB050803: CrAO optical observations, possible OT candidate
  74. GRB 050803: Keck Observations
  75. GRB 050803: Swift-BAT refined analysis
  76. GRB 050802.422: Fading of the afterglow and detection of the host
  77. GRB050803: MASTER further analys
  78. GRB 050803, optical observations
  79. GRB 050803: Magellan Observations
  80. GRB 050803: early Swift XRT analysis results
  81. GRB 050803: TAROT optical limits
  82. GRB050803: MASTER optical observations
  83. GRB050802: Tentative absorption redshift
  84. GCN GRB observation 050713A
  85. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  86. GRB 050802: Swift/UVOT optical and UV detections
  87. GRB050802: CrAO optical observations
  88. GRB050801: Unchanged decay slope
  89. GRB 050730: OHP optical observations
  90. GRB 050802: early Swift XRT analysis results
  91. GRB 050802: Swift/UVOT observations
  92. GRB 050802 : Lulin Optical follow-up observation
  93. GRB 050802: Swift-BAT refined analysis
  94. GRB050801: Optical photometry and decay index
  95. GRB 050802: XRT position
  96. GRB 050802: Swift Gamma-ray Burst
  97. GRB 050730: Preliminary Analysis of MIKE Spectrum
  98. GCN 050801: early Swift XRT analysis results
  99. GRB 050801: Swift-BAT refined analysis
  100. GRB 050801, SMARTS optical/IR afterglow observations

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