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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"

36103 results found.

  1. GRB 050820a - corrections to GCN 3846
  2. Swift/UVOT UV Photometry of GRB 050820B
  3. GRB 050822: ROTSE-III Prompt Optical Limits
  4. GRB 050822: Swift detection of a long burst
  5. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  6. GRB050820A: Radio Observation
  7. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  8. GRB050820a BVRcIc field photometry
  9. GRB 050820a: NIR Observations by WIRO
  10. GRB 050820B: Swift XRT position
  11. GRB050820B: Refined analysis of the Swift-BAT burst
  12. GRB050820B: BAT-Swift detection of a bright GRB
  13. GRB050820: refined XRT analysis
  14. GRB 050820: Early RAPTOR detections
  15. GRB 050820 Swift-BAT refined analysis
  16. GRB 050820: P60 Temporal Decay Index
  17. GRB 050820: High Resolution Spectroscopy from Keck
  18. GRB050819: RTT150 optical observations
  19. GRB 050820: Swift detection of a GRB
  20. GRB 050819 Swift-BAT refined analysis
  21. GRB050819: Swift XRT position
  22. GRB050819: Swift-BAT detection of a weak burst
  23. Swift-BAT trigger 150993 is not a GRB
  24. Swift Trigger 150823 is HETE J1900.1-2455
  25. GRB 050817: Optical observations
  26. GRB 050815: Radio Observation
  27. GRB050814: Radio Observation
  28. GRB050817: Negative Optical Observations
  29. GRB 050814: continued fading
  30. GRB 050813: Radio Observations
  31. GRB050815: Refined analysis of the Swift-BAT burst
  32. GRB 050815: ROTSE-III Optical Limits
  33. GRB050815: Swift XRT afterglow localization
  34. GRB 050730: Third Epoch WSRT Radio Observations
  35. GRB050814: Fading red source
  36. GRB 050813: Gemini Spectra Revisited
  37. GRB 050813: Non-fading of afterglow candidate
  38. GRB 050814: XRT refined analysis
  39. GRB050814: Refined analysis of the Swift-BAT burst
  40. GRB050813: Gemini Imaging
  41. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  42. GRB 050814: Swift XRT Afterglow Localization
  43. GRB 050814: Swift detection of a burst
  44. GRB 050813: Magellan detection of a high redshift galaxy cluster
  45. GRB050813: RTT150 optical observations
  46. GRB 050813: I-band observations
  47. GRB050813, SDSS pre-burst observations
  48. GRB 050813: KAIT optical limit
  49. GRB 050813: Swift-BAT refined analysis
  50. GRB 050813: Photometry of object in XRT error circle
  51. GRB 050813: Swift XRT afterglow localization
  52. RBO GRB 050714A and GRB 050716 observations
  53. GRB 050813: Possible Short Swift-BAT GRB
  54. Swift-BAT trigger 150131 is not a GRB
  55. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  56. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  57. GRB050803: CrAO optical observations, no OT candidate
  58. GRB 050730: WSRT Radio Observations
  59. GRB 050803: PROMPT BVRcIc Observations
  60. GRB 050807: ROTSE-III Optical Limits
  61. GRB 050730, optical observation
  62. GRB050805b: CrAO optical limit
  63. GRB050805a : Null detection report
  64. GRB050730, optical observations
  65. GRB050803, optical observations
  66. Swift-BAT trigger 149118 is very likely not a GRB
  67. Retraction of Swift Trigger 149131 (GRB 050805B)
  68. GRB 050805b: OHP optical limits
  69. GRB 050805b: TAROT optical limits
  70. GRB050805b: MASTER optical observations
  71. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  72. GRB050805a: MASTER optical candidat
  73. Swift-BAT trigger 149118 is probably not a GRB
  74. GRB 050803: RTT150 optical observations
  75. GRB050803: CrAO optical observations, possible OT candidate
  76. GRB 050803: Keck Observations
  77. GRB 050803: Swift-BAT refined analysis
  78. GRB 050802.422: Fading of the afterglow and detection of the host
  79. GRB050803: MASTER further analys
  80. GRB 050803, optical observations
  81. GRB 050803: Magellan Observations
  82. GRB 050803: early Swift XRT analysis results
  83. GRB 050803: TAROT optical limits
  84. GRB050803: MASTER optical observations
  85. GRB050802: Tentative absorption redshift
  86. GCN GRB observation 050713A
  87. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  88. GRB 050802: Swift/UVOT optical and UV detections
  89. GRB050802: CrAO optical observations
  90. GRB050801: Unchanged decay slope
  91. GRB 050730: OHP optical observations
  92. GRB 050802: early Swift XRT analysis results
  93. GRB 050802: Swift/UVOT observations
  94. GRB 050802 : Lulin Optical follow-up observation
  95. GRB 050802: Swift-BAT refined analysis
  96. GRB050801: Optical photometry and decay index
  97. GRB 050802: XRT position
  98. GRB 050802: Swift Gamma-ray Burst
  99. GRB 050730: Preliminary Analysis of MIKE Spectrum
  100. GCN 050801: early Swift XRT analysis results

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