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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"

37746 results found.

  1. GRB 050827: P200 NIR Observations
  2. GRB 050827: Optical Limit
  3. GRB 050827: XRT possible afterglow detection
  4. GRB 050826 : Lulin R band observation
  5. GRB050824: Maidanak optical limits
  6. GRB050820A: RTT150 optical observations
  7. GRB050827: RTT150 optical observations
  8. GRB 050827: Swift-BAT refined analysis
  9. GRB 050826: Optical Candidate
  10. GRB050824, HETE-2 Observation
  11. GRB 050826: Swift XRT preliminary analysis results
  12. GRB 050826: BAT refined analysis
  13. GRB050824: First 2 hours of power low optical decay?
  14. GRB 050826: Swift XRT position
  15. GRB050826: Swift-BAT detection of a long burst
  16. GRB050824: MASTER final analysis of the OT observations
  17. Possible GRB050825:MASTER optical observations
  18. Swift-BAT trigger 152038 is definitely not a GRB
  19. Swift-BAT trigger 152038 is probably not a GRB
  20. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  21. GRB050824, I-band imaging
  22. GRB050824: Radio Observations
  23. GRB 050824: Spectroscopic redshift from the VLT
  24. GRB 050822: refined XRT analysis
  25. GRB 050824: XRT refined analysis and possible afterglow detection
  26. GRB 050824: BAT refined analysis of a soft weak burst
  27. GRB050824: MASTER:OT decay
  28. GRB050824: MASTER observation OT
  29. GRB050805a: MASTER optical candidat
  30. GRB 050824: ROTSE-III Optical Limits
  31. GRB050824: Swift-BAT detection of a burst
  32. GRB 050824 optical candidate
  33. GRB050820A: RTT150 optical observations
  34. GRB050820a: PROMPT RcIc Observations
  35. GRB050815: Maidanak optical observation
  36. XRF050509c: Radio upper limits from GMRT
  37. VLT/UVES spectroscopy of GRB050820
  38. GRB 050820A BAT observations of second, larger episode of emission
  39. GRB050813: Maidanak I-band observations
  40. GRB 050822: Swift-BAT refined analysis
  41. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  42. GRB050820B at FRAM
  43. GRB050820A: RTT150 optical observations
  44. GRB 050820a - corrections to GCN 3846
  45. Swift/UVOT UV Photometry of GRB 050820B
  46. GRB 050822: ROTSE-III Prompt Optical Limits
  47. GRB 050822: Swift detection of a long burst
  48. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  49. GRB050820A: Radio Observation
  50. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  51. GRB050820a BVRcIc field photometry
  52. GRB 050820a: NIR Observations by WIRO
  53. GRB 050820B: Swift XRT position
  54. GRB050820B: Refined analysis of the Swift-BAT burst
  55. GRB050820B: BAT-Swift detection of a bright GRB
  56. GRB050820: refined XRT analysis
  57. GRB 050820: Early RAPTOR detections
  58. GRB 050820 Swift-BAT refined analysis
  59. GRB 050820: P60 Temporal Decay Index
  60. GRB 050820: High Resolution Spectroscopy from Keck
  61. GRB050819: RTT150 optical observations
  62. GRB 050820: Swift detection of a GRB
  63. GRB 050819 Swift-BAT refined analysis
  64. GRB050819: Swift XRT position
  65. GRB050819: Swift-BAT detection of a weak burst
  66. Swift-BAT trigger 150993 is not a GRB
  67. Swift Trigger 150823 is HETE J1900.1-2455
  68. GRB 050817: Optical observations
  69. GRB 050815: Radio Observation
  70. GRB050814: Radio Observation
  71. GRB050817: Negative Optical Observations
  72. GRB 050814: continued fading
  73. GRB 050813: Radio Observations
  74. GRB050815: Refined analysis of the Swift-BAT burst
  75. GRB 050815: ROTSE-III Optical Limits
  76. GRB050815: Swift XRT afterglow localization
  77. GRB 050730: Third Epoch WSRT Radio Observations
  78. GRB050814: Fading red source
  79. GRB 050813: Gemini Spectra Revisited
  80. GRB 050813: Non-fading of afterglow candidate
  81. GRB 050814: XRT refined analysis
  82. GRB050814: Refined analysis of the Swift-BAT burst
  83. GRB050813: Gemini Imaging
  84. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  85. GRB 050814: Swift XRT Afterglow Localization
  86. GRB 050814: Swift detection of a burst
  87. GRB 050813: Magellan detection of a high redshift galaxy cluster
  88. GRB050813: RTT150 optical observations
  89. GRB 050813: I-band observations
  90. GRB050813, SDSS pre-burst observations
  91. GRB 050813: KAIT optical limit
  92. GRB 050813: Swift-BAT refined analysis
  93. GRB 050813: Photometry of object in XRT error circle
  94. GRB 050813: Swift XRT afterglow localization
  95. RBO GRB 050714A and GRB 050716 observations
  96. GRB 050813: Possible Short Swift-BAT GRB
  97. Swift-BAT trigger 150131 is not a GRB
  98. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  99. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  100. GRB050803: CrAO optical observations, no OT candidate

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