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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"

32721 results found.

  1. GRB050824: MASTER observation OT
  2. GRB050805a: MASTER optical candidat
  3. GRB 050824: ROTSE-III Optical Limits
  4. GRB050820A: RTT150 optical observations
  5. GRB050820a: PROMPT RcIc Observations
  6. GRB050815: Maidanak optical observation
  7. XRF050509c: Radio upper limits from GMRT
  8. VLT/UVES spectroscopy of GRB050820
  9. GRB050822: Swift/UVOT upper limits
  10. GRB 050820A BAT observations of second, larger episode of emission
  11. GRB050813: Maidanak I-band observations
  12. GRB 050822: Swift-BAT refined analysis
  13. GRB050820A: RTT150 optical observations
  14. GRB 050820a - corrections to GCN 3846
  15. Swift/UVOT UV Photometry of GRB 050820B
  16. GRB 050822: ROTSE-III Prompt Optical Limits
  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. Swift/UVOT photometry of GRB050820
  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: refined XRT analysis
  31. GRB050819: RTT150 optical observations
  32. GRB 050820: Swift detection of a GRB
  33. GRB 050819 Swift-BAT refined analysis
  34. GRB050819: Swift XRT position
  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. GRB050815: XRT refined analysis
  43. GRB 050813: Radio Observations
  44. GRB050815: Refined analysis of the Swift-BAT burst
  45. GRB 050815: ROTSE-III Optical Limits
  46. GRB050815: Swift XRT afterglow localization
  47. GRB 050730: Third Epoch WSRT Radio Observations
  48. GRB050814: Fading red source
  49. GRB 050813: Gemini Spectra Revisited
  50. GRB050814: P60 Optical Afterglow Candidate
  51. GRB 050813: Non-fading of afterglow candidate
  52. GRB 050814: XRT refined analysis
  53. GRB050814: SWIFT/UVOT observation
  54. GRB050814: Refined analysis of the Swift-BAT burst
  55. GRB050813: Gemini Imaging
  56. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  57. GRB 050814: Swift XRT Afterglow Localization
  58. GRB 050814: Swift detection of a burst
  59. GRB 050813: Magellan detection of a high redshift galaxy cluster
  60. GRB050813: RTT150 optical observations
  61. GRB 050813: I-band observations
  62. GRB050813, SDSS pre-burst observations
  63. GRB 050813: KAIT optical limit
  64. GRB 050813: Swift-BAT refined analysis
  65. GRB 050813: Photometry of object in XRT error circle
  66. GRB050813: SWIFT/UVOT observation
  67. GRB 050813: Swift XRT afterglow localization
  68. RBO GRB 050714A and GRB 050716 observations
  69. Swift-BAT trigger 150131 is not a GRB
  70. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  71. GRB050803: CrAO optical observations, no OT candidate
  72. GRB 050730: WSRT Radio Observations
  73. GRB 050803: PROMPT BVRcIc Observations
  74. GRB 050807: ROTSE-III Optical Limits
  75. GRB 050730, optical observation
  76. GRB050805a : Null detection report
  77. GRB050730, optical observations
  78. GRB050803, optical observations
  79. GRB 050805b: TAROT optical limits
  80. GRB050802: TNG optical observations
  81. GRB050803: Radio Observation
  82. GRB 050803: RTT150 optical observations
  83. GRB050801: Radio Observation
  84. GRB050730: Radio Detection
  85. GRB050803: CrAO optical observations, possible OT candidate
  86. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  87. GRB 050803: Keck Observations
  88. GRB 050803: Swift-BAT refined analysis
  89. GRB 050802.422: Fading of the afterglow and detection of the host
  90. GRB050803: MASTER further analys
  91. GRB 050803, optical observations
  92. GRB 050803: Magellan Observations
  93. GRB 050803: early Swift XRT analysis results
  94. GRB050802: Tentative absorption redshift
  95. GCN GRB observation 050713A
  96. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  97. GRB 050802: Swift/UVOT optical and UV detections
  98. GRB050802: CrAO optical observations
  99. GRB050801: Unchanged decay slope
  100. GRB050802 radio non-detection

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