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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"

37718 results found.

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

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