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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"

37717 results found.

  1. GRB 050824: ROTSE-III Optical Limits
  2. GRB050824: Swift-BAT detection of a burst
  3. GRB 050824 optical candidate
  4. GRB050820A: RTT150 optical observations
  5. GRB050820a: PROMPT RcIc Observations
  6. GRB050815: Maidanak optical observation
  7. XRF050509c: Radio upper limits from GMRT
  8. VLT/UVES spectroscopy of GRB050820
  9. GRB 050820A BAT observations of second, larger episode of emission
  10. GRB050813: Maidanak I-band observations
  11. GRB 050822: Swift-BAT refined analysis
  12. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  13. GRB050820B at FRAM
  14. GRB050820A: RTT150 optical observations
  15. GRB 050820a - corrections to GCN 3846
  16. Swift/UVOT UV Photometry of GRB 050820B
  17. GRB 050822: ROTSE-III Prompt Optical Limits
  18. GRB 050822: Swift detection of a long burst
  19. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  20. GRB050820A: Radio Observation
  21. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  22. GRB050820a BVRcIc field photometry
  23. GRB 050820a: NIR Observations by WIRO
  24. GRB 050820B: Swift XRT position
  25. GRB050820B: Refined analysis of the Swift-BAT burst
  26. GRB050820B: BAT-Swift detection of a bright GRB
  27. GRB050820: refined XRT analysis
  28. GRB 050820: Early RAPTOR detections
  29. GRB 050820 Swift-BAT refined analysis
  30. GRB 050820: P60 Temporal Decay Index
  31. GRB 050820: High Resolution Spectroscopy from Keck
  32. GRB050819: RTT150 optical observations
  33. GRB 050820: Swift detection of a GRB
  34. GRB 050819 Swift-BAT refined analysis
  35. GRB050819: Swift XRT position
  36. GRB050819: Swift-BAT detection of a weak burst
  37. Swift-BAT trigger 150993 is not a GRB
  38. Swift Trigger 150823 is HETE J1900.1-2455
  39. GRB 050817: Optical observations
  40. GRB 050815: Radio Observation
  41. GRB050814: Radio Observation
  42. GRB050817: Negative Optical Observations
  43. GRB 050814: continued fading
  44. GRB 050813: Radio Observations
  45. GRB050815: Refined analysis of the Swift-BAT burst
  46. GRB 050815: ROTSE-III Optical Limits
  47. GRB050815: Swift XRT afterglow localization
  48. GRB 050730: Third Epoch WSRT Radio Observations
  49. GRB050814: Fading red source
  50. GRB 050813: Gemini Spectra Revisited
  51. GRB 050813: Non-fading of afterglow candidate
  52. GRB 050814: XRT refined analysis
  53. GRB050814: Refined analysis of the Swift-BAT burst
  54. GRB050813: Gemini Imaging
  55. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  56. GRB 050814: Swift XRT Afterglow Localization
  57. GRB 050814: Swift detection of a burst
  58. GRB 050813: Magellan detection of a high redshift galaxy cluster
  59. GRB050813: RTT150 optical observations
  60. GRB 050813: I-band observations
  61. GRB050813, SDSS pre-burst observations
  62. GRB 050813: KAIT optical limit
  63. GRB 050813: Swift-BAT refined analysis
  64. GRB 050813: Photometry of object in XRT error circle
  65. GRB 050813: Swift XRT afterglow localization
  66. RBO GRB 050714A and GRB 050716 observations
  67. GRB 050813: Possible Short Swift-BAT GRB
  68. Swift-BAT trigger 150131 is not a GRB
  69. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  70. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  71. GRB050803: CrAO optical observations, no OT candidate
  72. GRB 050730: WSRT Radio Observations
  73. GRB 050803: PROMPT BVRcIc Observations
  74. GRB 050807: ROTSE-III Optical Limits
  75. GRB 050730, optical observation
  76. GRB050805b: CrAO optical limit
  77. GRB050805a : Null detection report
  78. GRB050730, optical observations
  79. GRB050803, optical observations
  80. Swift-BAT trigger 149118 is very likely not a GRB
  81. Retraction of Swift Trigger 149131 (GRB 050805B)
  82. GRB 050805b: OHP optical limits
  83. GRB 050805b: TAROT optical limits
  84. GRB050805b: MASTER optical observations
  85. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  86. GRB050805a: MASTER optical candidat
  87. Swift-BAT trigger 149118 is probably not a GRB
  88. GRB 050803: RTT150 optical observations
  89. GRB050803: CrAO optical observations, possible OT candidate
  90. GRB 050803: Keck Observations
  91. GRB 050803: Swift-BAT refined analysis
  92. GRB 050802.422: Fading of the afterglow and detection of the host
  93. GRB050803: MASTER further analys
  94. GRB 050803, optical observations
  95. GRB 050803: Magellan Observations
  96. GRB 050803: early Swift XRT analysis results
  97. GRB 050803: TAROT optical limits
  98. GRB050803: MASTER optical observations
  99. GRB050802: Tentative absorption redshift
  100. GCN GRB observation 050713A

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