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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"

32716 results found.

  1. GRB050815: Maidanak optical observation
  2. XRF050509c: Radio upper limits from GMRT
  3. VLT/UVES spectroscopy of GRB050820
  4. GRB050822: Swift/UVOT upper limits
  5. GRB 050820A BAT observations of second, larger episode of emission
  6. GRB050813: Maidanak I-band observations
  7. GRB 050822: Swift-BAT refined analysis
  8. GRB050820A: RTT150 optical observations
  9. GRB 050820a - corrections to GCN 3846
  10. Swift/UVOT UV Photometry of GRB 050820B
  11. GRB 050822: ROTSE-III Prompt Optical Limits
  12. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  13. GRB050820A: Radio Observation
  14. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  15. GRB050820a BVRcIc field photometry
  16. GRB 050820a: NIR Observations by WIRO
  17. GRB 050820B: Swift XRT position
  18. GRB050820B: Refined analysis of the Swift-BAT burst
  19. Swift/UVOT photometry of GRB050820
  20. GRB050820: refined XRT analysis
  21. GRB 050820: Early RAPTOR detections
  22. GRB 050820 Swift-BAT refined analysis
  23. GRB 050820: P60 Temporal Decay Index
  24. GRB 050820: High Resolution Spectroscopy from Keck
  25. GRB050819: refined XRT analysis
  26. GRB050819: RTT150 optical observations
  27. GRB 050820: Swift detection of a GRB
  28. GRB 050819 Swift-BAT refined analysis
  29. GRB050819: Swift XRT position
  30. Swift-BAT trigger 150993 is not a GRB
  31. Swift Trigger 150823 is HETE J1900.1-2455
  32. GRB 050817: Optical observations
  33. GRB 050815: Radio Observation
  34. GRB050814: Radio Observation
  35. GRB050817: Negative Optical Observations
  36. GRB 050814: continued fading
  37. GRB050815: XRT refined analysis
  38. GRB 050813: Radio Observations
  39. GRB050815: Refined analysis of the Swift-BAT burst
  40. GRB 050815: ROTSE-III Optical Limits
  41. GRB050815: Swift XRT afterglow localization
  42. GRB 050730: Third Epoch WSRT Radio Observations
  43. GRB050814: Fading red source
  44. GRB 050813: Gemini Spectra Revisited
  45. GRB050814: P60 Optical Afterglow Candidate
  46. GRB 050813: Non-fading of afterglow candidate
  47. GRB 050814: XRT refined analysis
  48. GRB050814: SWIFT/UVOT observation
  49. GRB050814: Refined analysis of the Swift-BAT burst
  50. GRB050813: Gemini Imaging
  51. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  52. GRB 050814: Swift XRT Afterglow Localization
  53. GRB 050814: Swift detection of a burst
  54. GRB 050813: Magellan detection of a high redshift galaxy cluster
  55. GRB050813: RTT150 optical observations
  56. GRB 050813: I-band observations
  57. GRB050813, SDSS pre-burst observations
  58. GRB 050813: KAIT optical limit
  59. GRB 050813: Swift-BAT refined analysis
  60. GRB 050813: Photometry of object in XRT error circle
  61. GRB050813: SWIFT/UVOT observation
  62. GRB 050813: Swift XRT afterglow localization
  63. RBO GRB 050714A and GRB 050716 observations
  64. Swift-BAT trigger 150131 is not a GRB
  65. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  66. GRB050803: CrAO optical observations, no OT candidate
  67. GRB 050730: WSRT Radio Observations
  68. GRB 050803: PROMPT BVRcIc Observations
  69. GRB 050807: ROTSE-III Optical Limits
  70. GRB 050730, optical observation
  71. GRB050805a : Null detection report
  72. GRB050730, optical observations
  73. GRB050803, optical observations
  74. GRB 050805b: TAROT optical limits
  75. GRB050802: TNG optical observations
  76. GRB050803: Radio Observation
  77. GRB 050803: RTT150 optical observations
  78. GRB050801: Radio Observation
  79. GRB050730: Radio Detection
  80. GRB050803: CrAO optical observations, possible OT candidate
  81. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  82. GRB 050803: Keck Observations
  83. GRB 050803: Swift-BAT refined analysis
  84. GRB 050802.422: Fading of the afterglow and detection of the host
  85. GRB050803: MASTER further analys
  86. GRB 050803, optical observations
  87. GRB 050803: Magellan Observations
  88. GRB 050803: early Swift XRT analysis results
  89. GRB050802: Tentative absorption redshift
  90. GCN GRB observation 050713A
  91. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  92. GRB 050802: Swift/UVOT optical and UV detections
  93. GRB050802: CrAO optical observations
  94. GRB050801: Unchanged decay slope
  95. GRB050802 radio non-detection
  96. GRB 050802: early Swift XRT analysis results
  97. GRB 050802: Swift/UVOT observations
  98. GRB 050802: Swift-BAT refined analysis
  99. GRB050801: Optical photometry and decay index
  100. GRB 050802: XRT position

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