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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"

43003 results found.

  1. GRB 050904: Swift/UVOT observations
  2. GRB 050904: Afterglow Astrometry
  3. GRB 050904: NIR object inside the XRT error box
  4. GRB 050904: early Swift XRT analysis results
  5. GRB 050904: SOAR YJ and PROMPT Ic Observations
  6. GRB 050904: BAT refined analysis of partial data set
  7. GRB050904: Optical Observations
  8. GRB 050904: Environmental Constraints
  9. GRB 050904: Possible High-Redshift GRB
  10. GRB 050904: SOAR/PROMPT Observations
  11. GRB050904: P60 Observations
  12. GRB 050904: TAROT optical limits
  13. GRB050904: Swift-BAT detection of a probable burst
  14. Swift-BAT triggers 153461-153465 are not GRBs
  15. Retraction of Swift-BAT trigger #153355
  16. GRB 050824: MDM Observations
  17. GRB 050827: Swift XRT preliminary analysis results
  18. IBAS Alerts 2641 and 2642: not a real GRB
  19. Swift Trigger #152652 is not a GRB
  20. GRB 050827 : OSN 1.5m optical observations
  21. GRB 050827: P200 NIR Observations
  22. GRB050827: Swift/UVOT upper limits
  23. GRB 050826 : Lulin R band observation
  24. GRB050827: RTT150 optical observations
  25. GRB 050827: Swift-BAT refined analysis
  26. GRB050827: Swift-BAT detection of a burst
  27. Subaru Observations of GRB050724
  28. GRB 050826: Optical Candidate
  29. GRB050824, HETE-2 Observation
  30. GRB 050826: Swift XRT preliminary analysis results
  31. GRB 050826: BAT refined analysis
  32. GRB050826: Swift/UVOT early upper limits
  33. GRB050824: First 2 hours of power low optical decay?
  34. GRB050826: Swift-BAT detection of a long burst
  35. GRB050824: MASTER final analysis of the OT observations
  36. Possible GRB050825:MASTER optical observations
  37. GRB050824: CORRECTION to UVOT observing times
  38. Swift-BAT trigger 152038 is probably not a GRB
  39. GRB050824: Swift/UVOT detection of fading afterglow
  40. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  41. GRB050824, I-band imaging
  42. GRB050824: Radio Observations
  43. GRB 050824: Spectroscopic redshift from the VLT
  44. GRB 050822: refined XRT analysis
  45. GRB 050824: XRT refined analysis and possible afterglow detection
  46. GRB 050824: BAT refined analysis of a soft weak burst
  47. GRB 050824: ROTSE-III Optical Limits
  48. GRB050824: Swift-BAT detection of a burst
  49. GRB050820A: RTT150 optical observations
  50. GRB050820a: PROMPT RcIc Observations
  51. XRF050509c: Radio upper limits from GMRT
  52. VLT/UVES spectroscopy of GRB050820
  53. GRB050822: Swift/UVOT upper limits
  54. GRB 050820A BAT observations of second, larger episode of emission
  55. GRB 050822: Swift-BAT refined analysis
  56. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  57. GRB050820B at FRAM
  58. GRB050820A: RTT150 optical observations
  59. GRB 050820a - corrections to GCN 3846
  60. Swift/UVOT UV Photometry of GRB 050820B
  61. GRB 050822: ROTSE-III Prompt Optical Limits
  62. GRB 050822: Swift detection of a long burst
  63. GRB050820A: Radio Observation
  64. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  65. GRB050820a BVRcIc field photometry
  66. GRB050820B XMM-Newton observation
  67. GRB 050820a: NIR Observations by WIRO
  68. GRB 050820B: Swift XRT position
  69. GRB050820B: Refined analysis of the Swift-BAT burst
  70. GRB050820B: BAT-Swift detection of a bright GRB
  71. Swift/UVOT photometry of GRB050820
  72. GRB050820: refined XRT analysis
  73. GRB 050820: Early RAPTOR detections
  74. GRB 050820 Swift-BAT refined analysis
  75. GRB 050820: P60 Temporal Decay Index
  76. GRB 050820: High Resolution Spectroscopy from Keck
  77. GRB050819: refined XRT analysis
  78. GRB050819: RTT150 optical observations
  79. GRB 050820: Swift detection of a GRB
  80. GRB050820: Optical afterglow from P60
  81. GRB050819: Swift-BAT detection of a weak burst
  82. Swift-BAT trigger 150993 is not a GRB
  83. Swift Trigger 150823 is HETE J1900.1-2455
  84. GRB 050817: Optical observations
  85. GRB 050815: Radio Observation
  86. GRB050814: Radio Observation
  87. GRB050817: Negative Optical Observations
  88. GRB050817: Swift-BAT Detection of a burst
  89. GRB 050814: continued fading
  90. GRB050815: Optical afterglow detection by Swift UVOT
  91. GRB050815: XRT refined analysis
  92. GRB 050813: Radio Observations
  93. GRB050815: Refined analysis of the Swift-BAT burst
  94. GRB 050815: ROTSE-III Optical Limits
  95. GRB050815: Swift XRT afterglow localization
  96. GRB050815: Swift-BAT detection of a burst
  97. GRB 050730: Third Epoch WSRT Radio Observations
  98. GRB050814: Fading red source
  99. GRB 050813: Gemini Spectra Revisited
  100. GRB050814: P60 Optical Afterglow Candidate

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