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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"

36144 results found.

  1. GRB 050827: XRT possible afterglow detection
  2. GRB 050826 : Lulin R band observation
  3. GRB050824: Maidanak optical limits
  4. GRB050820A: RTT150 optical observations
  5. GRB050827: RTT150 optical observations
  6. GRB 050827: Swift-BAT refined analysis
  7. GRB 050826: Optical Candidate
  8. GRB050824, HETE-2 Observation
  9. GRB 050826: Swift XRT preliminary analysis results
  10. GRB 050826: BAT refined analysis
  11. GRB050824: First 2 hours of power low optical decay?
  12. GRB 050826: Swift XRT position
  13. GRB050826: Swift-BAT detection of a long burst
  14. GRB050824: MASTER final analysis of the OT observations
  15. Possible GRB050825:MASTER optical observations
  16. Swift-BAT trigger 152038 is definitely not a GRB
  17. Swift-BAT trigger 152038 is probably not a GRB
  18. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  19. GRB050824, I-band imaging
  20. GRB050824: Radio Observations
  21. GRB 050824: Spectroscopic redshift from the VLT
  22. GRB 050822: refined XRT analysis
  23. GRB 050824: XRT refined analysis and possible afterglow detection
  24. GRB 050824: BAT refined analysis of a soft weak burst
  25. GRB050824: MASTER:OT decay
  26. GRB050824: MASTER observation OT
  27. GRB050805a: MASTER optical candidat
  28. GRB 050824: ROTSE-III Optical Limits
  29. GRB050824: Swift-BAT detection of a burst
  30. GRB 050824 optical candidate
  31. GRB050820A: RTT150 optical observations
  32. GRB050820a: PROMPT RcIc Observations
  33. GRB050815: Maidanak optical observation
  34. XRF050509c: Radio upper limits from GMRT
  35. VLT/UVES spectroscopy of GRB050820
  36. GRB 050820A BAT observations of second, larger episode of emission
  37. GRB050813: Maidanak I-band observations
  38. GRB 050822: Swift-BAT refined analysis
  39. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  40. GRB050820B at FRAM
  41. GRB050820A: RTT150 optical observations
  42. GRB 050820a - corrections to GCN 3846
  43. Swift/UVOT UV Photometry of GRB 050820B
  44. GRB 050822: ROTSE-III Prompt Optical Limits
  45. GRB 050822: Swift detection of a long burst
  46. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  47. GRB050820A: Radio Observation
  48. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  49. GRB050820a BVRcIc field photometry
  50. GRB 050820a: NIR Observations by WIRO
  51. GRB 050820B: Swift XRT position
  52. GRB050820B: Refined analysis of the Swift-BAT burst
  53. GRB050820B: BAT-Swift detection of a bright GRB
  54. GRB050820: refined XRT analysis
  55. GRB 050820: Early RAPTOR detections
  56. GRB 050820 Swift-BAT refined analysis
  57. GRB 050820: P60 Temporal Decay Index
  58. GRB 050820: High Resolution Spectroscopy from Keck
  59. GRB050819: RTT150 optical observations
  60. GRB 050820: Swift detection of a GRB
  61. GRB 050819 Swift-BAT refined analysis
  62. GRB050819: Swift XRT position
  63. GRB050819: Swift-BAT detection of a weak burst
  64. Swift-BAT trigger 150993 is not a GRB
  65. Swift Trigger 150823 is HETE J1900.1-2455
  66. GRB 050817: Optical observations
  67. GRB 050815: Radio Observation
  68. GRB050814: Radio Observation
  69. GRB050817: Negative Optical Observations
  70. GRB 050814: continued fading
  71. GRB 050813: Radio Observations
  72. GRB050815: Refined analysis of the Swift-BAT burst
  73. GRB 050815: ROTSE-III Optical Limits
  74. GRB050815: Swift XRT afterglow localization
  75. GRB 050730: Third Epoch WSRT Radio Observations
  76. GRB050814: Fading red source
  77. GRB 050813: Gemini Spectra Revisited
  78. GRB 050813: Non-fading of afterglow candidate
  79. GRB 050814: XRT refined analysis
  80. GRB050814: Refined analysis of the Swift-BAT burst
  81. GRB050813: Gemini Imaging
  82. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  83. GRB 050814: Swift XRT Afterglow Localization
  84. GRB 050814: Swift detection of a burst
  85. GRB 050813: Magellan detection of a high redshift galaxy cluster
  86. GRB050813: RTT150 optical observations
  87. GRB 050813: I-band observations
  88. GRB050813, SDSS pre-burst observations
  89. GRB 050813: KAIT optical limit
  90. GRB 050813: Swift-BAT refined analysis
  91. GRB 050813: Photometry of object in XRT error circle
  92. GRB 050813: Swift XRT afterglow localization
  93. RBO GRB 050714A and GRB 050716 observations
  94. GRB 050813: Possible Short Swift-BAT GRB
  95. Swift-BAT trigger 150131 is not a GRB
  96. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  97. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  98. GRB050803: CrAO optical observations, no OT candidate
  99. GRB 050730: WSRT Radio Observations
  100. GRB 050803: PROMPT BVRcIc Observations

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