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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"

36215 results found.

  1. GRB 050820A BAT observations of second, larger episode of emission
  2. GRB050813: Maidanak I-band observations
  3. GRB 050822: Swift-BAT refined analysis
  4. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  5. GRB050820B at FRAM
  6. GRB050820A: RTT150 optical observations
  7. GRB 050820a - corrections to GCN 3846
  8. Swift/UVOT UV Photometry of GRB 050820B
  9. GRB 050822: ROTSE-III Prompt Optical Limits
  10. GRB 050822: Swift detection of a long burst
  11. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  12. GRB050820A: Radio Observation
  13. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  14. GRB050820a BVRcIc field photometry
  15. GRB 050820a: NIR Observations by WIRO
  16. GRB 050820B: Swift XRT position
  17. GRB050820B: Refined analysis of the Swift-BAT burst
  18. GRB050820B: BAT-Swift detection of a bright GRB
  19. GRB050820: refined XRT analysis
  20. GRB 050820: Early RAPTOR detections
  21. GRB 050820 Swift-BAT refined analysis
  22. GRB 050820: P60 Temporal Decay Index
  23. GRB 050820: High Resolution Spectroscopy from Keck
  24. GRB050819: RTT150 optical observations
  25. GRB 050820: Swift detection of a GRB
  26. GRB 050819 Swift-BAT refined analysis
  27. GRB050819: Swift XRT position
  28. GRB050819: Swift-BAT detection of a weak burst
  29. Swift-BAT trigger 150993 is not a GRB
  30. Swift Trigger 150823 is HETE J1900.1-2455
  31. GRB 050817: Optical observations
  32. GRB 050815: Radio Observation
  33. GRB050814: Radio Observation
  34. GRB050817: Negative Optical Observations
  35. GRB 050814: continued fading
  36. GRB 050813: Radio Observations
  37. GRB050815: Refined analysis of the Swift-BAT burst
  38. GRB 050815: ROTSE-III Optical Limits
  39. GRB050815: Swift XRT afterglow localization
  40. GRB 050730: Third Epoch WSRT Radio Observations
  41. GRB050814: Fading red source
  42. GRB 050813: Gemini Spectra Revisited
  43. GRB 050813: Non-fading of afterglow candidate
  44. GRB 050814: XRT refined analysis
  45. GRB050814: Refined analysis of the Swift-BAT burst
  46. GRB050813: Gemini Imaging
  47. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  48. GRB 050814: Swift XRT Afterglow Localization
  49. GRB 050814: Swift detection of a burst
  50. GRB 050813: Magellan detection of a high redshift galaxy cluster
  51. GRB050813: RTT150 optical observations
  52. GRB 050813: I-band observations
  53. GRB050813, SDSS pre-burst observations
  54. GRB 050813: KAIT optical limit
  55. GRB 050813: Swift-BAT refined analysis
  56. GRB 050813: Photometry of object in XRT error circle
  57. GRB 050813: Swift XRT afterglow localization
  58. RBO GRB 050714A and GRB 050716 observations
  59. GRB 050813: Possible Short Swift-BAT GRB
  60. Swift-BAT trigger 150131 is not a GRB
  61. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  62. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  63. GRB050803: CrAO optical observations, no OT candidate
  64. GRB 050730: WSRT Radio Observations
  65. GRB 050803: PROMPT BVRcIc Observations
  66. GRB 050807: ROTSE-III Optical Limits
  67. GRB 050730, optical observation
  68. GRB050805b: CrAO optical limit
  69. GRB050805a : Null detection report
  70. GRB050730, optical observations
  71. GRB050803, optical observations
  72. Swift-BAT trigger 149118 is very likely not a GRB
  73. Retraction of Swift Trigger 149131 (GRB 050805B)
  74. GRB 050805b: OHP optical limits
  75. GRB 050805b: TAROT optical limits
  76. GRB050805b: MASTER optical observations
  77. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  78. GRB050805a: MASTER optical candidat
  79. Swift-BAT trigger 149118 is probably not a GRB
  80. GRB 050803: RTT150 optical observations
  81. GRB050803: CrAO optical observations, possible OT candidate
  82. GRB 050803: Keck Observations
  83. GRB 050803: Swift-BAT refined analysis
  84. GRB 050802.422: Fading of the afterglow and detection of the host
  85. GRB050803: MASTER further analys
  86. GRB 050803, optical observations
  87. GRB 050803: Magellan Observations
  88. GRB 050803: early Swift XRT analysis results
  89. GRB 050803: TAROT optical limits
  90. GRB050803: MASTER optical observations
  91. GRB050802: Tentative absorption redshift
  92. GCN GRB observation 050713A
  93. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  94. GRB 050802: Swift/UVOT optical and UV detections
  95. GRB050802: CrAO optical observations
  96. GRB050801: Unchanged decay slope
  97. GRB 050730: OHP optical observations
  98. GRB 050802: early Swift XRT analysis results
  99. GRB 050802: Swift/UVOT observations
  100. GRB 050802 : Lulin Optical follow-up observation

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