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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"

32724 results found.

  1. GRB 050822: refined XRT analysis
  2. GRB 050824: BAT refined analysis of a soft weak burst
  3. GRB050824: MASTER:OT decay
  4. GRB050824: MASTER observation OT
  5. GRB050805a: MASTER optical candidat
  6. GRB 050824: ROTSE-III Optical Limits
  7. GRB050820A: RTT150 optical observations
  8. GRB050820a: PROMPT RcIc Observations
  9. GRB050815: Maidanak optical observation
  10. XRF050509c: Radio upper limits from GMRT
  11. VLT/UVES spectroscopy of GRB050820
  12. GRB050822: Swift/UVOT upper limits
  13. GRB 050820A BAT observations of second, larger episode of emission
  14. GRB050813: Maidanak I-band observations
  15. GRB 050822: Swift-BAT refined analysis
  16. GRB050820A: RTT150 optical observations
  17. GRB 050820a - corrections to GCN 3846
  18. Swift/UVOT UV Photometry of GRB 050820B
  19. GRB 050822: ROTSE-III Prompt Optical Limits
  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. Swift/UVOT photometry of GRB050820
  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: refined XRT analysis
  34. GRB050819: RTT150 optical observations
  35. GRB 050820: Swift detection of a GRB
  36. GRB 050819 Swift-BAT refined analysis
  37. GRB050819: Swift XRT position
  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. GRB050815: XRT refined analysis
  46. GRB 050813: Radio Observations
  47. GRB050815: Refined analysis of the Swift-BAT burst
  48. GRB 050815: ROTSE-III Optical Limits
  49. GRB050815: Swift XRT afterglow localization
  50. GRB 050730: Third Epoch WSRT Radio Observations
  51. GRB050814: Fading red source
  52. GRB 050813: Gemini Spectra Revisited
  53. GRB050814: P60 Optical Afterglow Candidate
  54. GRB 050813: Non-fading of afterglow candidate
  55. GRB 050814: XRT refined analysis
  56. GRB050814: SWIFT/UVOT observation
  57. GRB050814: Refined analysis of the Swift-BAT burst
  58. GRB050813: Gemini Imaging
  59. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  60. GRB 050814: Swift XRT Afterglow Localization
  61. GRB 050814: Swift detection of a burst
  62. GRB 050813: Magellan detection of a high redshift galaxy cluster
  63. GRB050813: RTT150 optical observations
  64. GRB 050813: I-band observations
  65. GRB050813, SDSS pre-burst observations
  66. GRB 050813: KAIT optical limit
  67. GRB 050813: Swift-BAT refined analysis
  68. GRB 050813: Photometry of object in XRT error circle
  69. GRB050813: SWIFT/UVOT observation
  70. GRB 050813: Swift XRT afterglow localization
  71. RBO GRB 050714A and GRB 050716 observations
  72. Swift-BAT trigger 150131 is not a GRB
  73. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  74. GRB050803: CrAO optical observations, no OT candidate
  75. GRB 050730: WSRT Radio Observations
  76. GRB 050803: PROMPT BVRcIc Observations
  77. GRB 050807: ROTSE-III Optical Limits
  78. GRB 050730, optical observation
  79. GRB050805a : Null detection report
  80. GRB050730, optical observations
  81. GRB050803, optical observations
  82. GRB 050805b: TAROT optical limits
  83. GRB050802: TNG optical observations
  84. GRB050803: Radio Observation
  85. GRB 050803: RTT150 optical observations
  86. GRB050801: Radio Observation
  87. GRB050730: Radio Detection
  88. GRB050803: CrAO optical observations, possible OT candidate
  89. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  90. GRB 050803: Keck Observations
  91. GRB 050803: Swift-BAT refined analysis
  92. GRB 050802.422: Fading of the afterglow and detection of the host
  93. GRB050803: MASTER further analys
  94. GRB 050803, optical observations
  95. GRB 050803: Magellan Observations
  96. GRB 050803: early Swift XRT analysis results
  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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