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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"

36128 results found.

  1. Swift-BAT trigger 152038 is probably not a GRB
  2. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  3. GRB050824, I-band imaging
  4. GRB050824: Radio Observations
  5. GRB 050824: Spectroscopic redshift from the VLT
  6. GRB 050822: refined XRT analysis
  7. GRB 050824: XRT refined analysis and possible afterglow detection
  8. GRB 050824: BAT refined analysis of a soft weak burst
  9. GRB050824: MASTER:OT decay
  10. GRB050824: MASTER observation OT
  11. GRB050805a: MASTER optical candidat
  12. GRB 050824: ROTSE-III Optical Limits
  13. GRB050824: Swift-BAT detection of a burst
  14. GRB 050824 optical candidate
  15. GRB050820A: RTT150 optical observations
  16. GRB050820a: PROMPT RcIc Observations
  17. GRB050815: Maidanak optical observation
  18. XRF050509c: Radio upper limits from GMRT
  19. VLT/UVES spectroscopy of GRB050820
  20. GRB 050820A BAT observations of second, larger episode of emission
  21. GRB050813: Maidanak I-band observations
  22. GRB 050822: Swift-BAT refined analysis
  23. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  24. GRB050820B at FRAM
  25. GRB050820A: RTT150 optical observations
  26. GRB 050820a - corrections to GCN 3846
  27. Swift/UVOT UV Photometry of GRB 050820B
  28. GRB 050822: ROTSE-III Prompt Optical Limits
  29. GRB 050822: Swift detection of a long burst
  30. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  31. GRB050820A: Radio Observation
  32. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  33. GRB050820a BVRcIc field photometry
  34. GRB 050820a: NIR Observations by WIRO
  35. GRB 050820B: Swift XRT position
  36. GRB050820B: Refined analysis of the Swift-BAT burst
  37. GRB050820B: BAT-Swift detection of a bright GRB
  38. GRB050820: refined XRT analysis
  39. GRB 050820: Early RAPTOR detections
  40. GRB 050820 Swift-BAT refined analysis
  41. GRB 050820: P60 Temporal Decay Index
  42. GRB 050820: High Resolution Spectroscopy from Keck
  43. GRB050819: RTT150 optical observations
  44. GRB 050820: Swift detection of a GRB
  45. GRB 050819 Swift-BAT refined analysis
  46. GRB050819: Swift XRT position
  47. GRB050819: Swift-BAT detection of a weak burst
  48. Swift-BAT trigger 150993 is not a GRB
  49. Swift Trigger 150823 is HETE J1900.1-2455
  50. GRB 050817: Optical observations
  51. GRB 050815: Radio Observation
  52. GRB050814: Radio Observation
  53. GRB050817: Negative Optical Observations
  54. GRB 050814: continued fading
  55. GRB 050813: Radio Observations
  56. GRB050815: Refined analysis of the Swift-BAT burst
  57. GRB 050815: ROTSE-III Optical Limits
  58. GRB050815: Swift XRT afterglow localization
  59. GRB 050730: Third Epoch WSRT Radio Observations
  60. GRB050814: Fading red source
  61. GRB 050813: Gemini Spectra Revisited
  62. GRB 050813: Non-fading of afterglow candidate
  63. GRB 050814: XRT refined analysis
  64. GRB050814: Refined analysis of the Swift-BAT burst
  65. GRB050813: Gemini Imaging
  66. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  67. GRB 050814: Swift XRT Afterglow Localization
  68. GRB 050814: Swift detection of a burst
  69. GRB 050813: Magellan detection of a high redshift galaxy cluster
  70. GRB050813: RTT150 optical observations
  71. GRB 050813: I-band observations
  72. GRB050813, SDSS pre-burst observations
  73. GRB 050813: KAIT optical limit
  74. GRB 050813: Swift-BAT refined analysis
  75. GRB 050813: Photometry of object in XRT error circle
  76. GRB 050813: Swift XRT afterglow localization
  77. RBO GRB 050714A and GRB 050716 observations
  78. GRB 050813: Possible Short Swift-BAT GRB
  79. Swift-BAT trigger 150131 is not a GRB
  80. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  81. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  82. GRB050803: CrAO optical observations, no OT candidate
  83. GRB 050730: WSRT Radio Observations
  84. GRB 050803: PROMPT BVRcIc Observations
  85. GRB 050807: ROTSE-III Optical Limits
  86. GRB 050730, optical observation
  87. GRB050805b: CrAO optical limit
  88. GRB050805a : Null detection report
  89. GRB050730, optical observations
  90. GRB050803, optical observations
  91. Swift-BAT trigger 149118 is very likely not a GRB
  92. Retraction of Swift Trigger 149131 (GRB 050805B)
  93. GRB 050805b: OHP optical limits
  94. GRB 050805b: TAROT optical limits
  95. GRB050805b: MASTER optical observations
  96. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  97. GRB050805a: MASTER optical candidat
  98. Swift-BAT trigger 149118 is probably not a GRB
  99. GRB 050803: RTT150 optical observations
  100. GRB050803: CrAO optical observations, possible OT candidate

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