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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"

36221 results found.

  1. GRB 050824 optical candidate
  2. GRB050820A: RTT150 optical observations
  3. GRB050820a: PROMPT RcIc Observations
  4. GRB050815: Maidanak optical observation
  5. XRF050509c: Radio upper limits from GMRT
  6. VLT/UVES spectroscopy of GRB050820
  7. GRB 050820A BAT observations of second, larger episode of emission
  8. GRB050813: Maidanak I-band observations
  9. GRB 050822: Swift-BAT refined analysis
  10. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  11. GRB050820B at FRAM
  12. GRB050820A: RTT150 optical observations
  13. GRB 050820a - corrections to GCN 3846
  14. Swift/UVOT UV Photometry of GRB 050820B
  15. GRB 050822: ROTSE-III Prompt Optical Limits
  16. GRB 050822: Swift detection of a long burst
  17. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  18. GRB050820A: Radio Observation
  19. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  20. GRB050820a BVRcIc field photometry
  21. GRB 050820a: NIR Observations by WIRO
  22. GRB 050820B: Swift XRT position
  23. GRB050820B: Refined analysis of the Swift-BAT burst
  24. GRB050820B: BAT-Swift detection of a bright GRB
  25. GRB050820: refined XRT analysis
  26. GRB 050820: Early RAPTOR detections
  27. GRB 050820 Swift-BAT refined analysis
  28. GRB 050820: P60 Temporal Decay Index
  29. GRB 050820: High Resolution Spectroscopy from Keck
  30. GRB050819: RTT150 optical observations
  31. GRB 050820: Swift detection of a GRB
  32. GRB 050819 Swift-BAT refined analysis
  33. GRB050819: Swift XRT position
  34. GRB050819: Swift-BAT detection of a weak burst
  35. Swift-BAT trigger 150993 is not a GRB
  36. Swift Trigger 150823 is HETE J1900.1-2455
  37. GRB 050817: Optical observations
  38. GRB 050815: Radio Observation
  39. GRB050814: Radio Observation
  40. GRB050817: Negative Optical Observations
  41. GRB 050814: continued fading
  42. GRB 050813: Radio Observations
  43. GRB050815: Refined analysis of the Swift-BAT burst
  44. GRB 050815: ROTSE-III Optical Limits
  45. GRB050815: Swift XRT afterglow localization
  46. GRB 050730: Third Epoch WSRT Radio Observations
  47. GRB050814: Fading red source
  48. GRB 050813: Gemini Spectra Revisited
  49. GRB 050813: Non-fading of afterglow candidate
  50. GRB 050814: XRT refined analysis
  51. GRB050814: Refined analysis of the Swift-BAT burst
  52. GRB050813: Gemini Imaging
  53. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  54. GRB 050814: Swift XRT Afterglow Localization
  55. GRB 050814: Swift detection of a burst
  56. GRB 050813: Magellan detection of a high redshift galaxy cluster
  57. GRB050813: RTT150 optical observations
  58. GRB 050813: I-band observations
  59. GRB050813, SDSS pre-burst observations
  60. GRB 050813: KAIT optical limit
  61. GRB 050813: Swift-BAT refined analysis
  62. GRB 050813: Photometry of object in XRT error circle
  63. GRB 050813: Swift XRT afterglow localization
  64. RBO GRB 050714A and GRB 050716 observations
  65. GRB 050813: Possible Short Swift-BAT GRB
  66. Swift-BAT trigger 150131 is not a GRB
  67. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  68. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  69. GRB050803: CrAO optical observations, no OT candidate
  70. GRB 050730: WSRT Radio Observations
  71. GRB 050803: PROMPT BVRcIc Observations
  72. GRB 050807: ROTSE-III Optical Limits
  73. GRB 050730, optical observation
  74. GRB050805b: CrAO optical limit
  75. GRB050805a : Null detection report
  76. GRB050730, optical observations
  77. GRB050803, optical observations
  78. Swift-BAT trigger 149118 is very likely not a GRB
  79. Retraction of Swift Trigger 149131 (GRB 050805B)
  80. GRB 050805b: OHP optical limits
  81. GRB 050805b: TAROT optical limits
  82. GRB050805b: MASTER optical observations
  83. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  84. GRB050805a: MASTER optical candidat
  85. Swift-BAT trigger 149118 is probably not a GRB
  86. GRB 050803: RTT150 optical observations
  87. GRB050803: CrAO optical observations, possible OT candidate
  88. GRB 050803: Keck Observations
  89. GRB 050803: Swift-BAT refined analysis
  90. GRB 050802.422: Fading of the afterglow and detection of the host
  91. GRB050803: MASTER further analys
  92. GRB 050803, optical observations
  93. GRB 050803: Magellan Observations
  94. GRB 050803: early Swift XRT analysis results
  95. GRB 050803: TAROT optical limits
  96. GRB050803: MASTER optical observations
  97. GRB050802: Tentative absorption redshift
  98. GCN GRB observation 050713A
  99. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  100. GRB 050802: Swift/UVOT optical and UV detections

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