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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"

32735 results found.

  1. GRB 050826: Swift XRT preliminary analysis results
  2. GRB 050826: BAT refined analysis
  3. GRB050826: Swift/UVOT early upper limits
  4. GRB050824: First 2 hours of power low optical decay?
  5. GRB 050826: Swift XRT position
  6. GRB050824: MASTER final analysis of the OT observations
  7. GRB050824: CORRECTION to UVOT observing times
  8. GRB050824: Swift/UVOT detection of fading afterglow
  9. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  10. GRB050824: Radio Observations
  11. GRB 050824: Spectroscopic redshift from the VLT
  12. GRB 050822: refined XRT analysis
  13. GRB 050824: BAT refined analysis of a soft weak burst
  14. GRB050824: MASTER:OT decay
  15. GRB050824: MASTER observation OT
  16. GRB050805a: MASTER optical candidat
  17. GRB 050824: ROTSE-III Optical Limits
  18. GRB050820A: RTT150 optical observations
  19. GRB050820a: PROMPT RcIc Observations
  20. GRB050815: Maidanak optical observation
  21. XRF050509c: Radio upper limits from GMRT
  22. VLT/UVES spectroscopy of GRB050820
  23. GRB050822: Swift/UVOT upper limits
  24. GRB 050820A BAT observations of second, larger episode of emission
  25. GRB050813: Maidanak I-band observations
  26. GRB 050822: Swift-BAT refined analysis
  27. GRB050820A: RTT150 optical observations
  28. GRB 050820a - corrections to GCN 3846
  29. Swift/UVOT UV Photometry of GRB 050820B
  30. GRB 050822: ROTSE-III Prompt Optical Limits
  31. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  32. GRB050820A: Radio Observation
  33. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  34. GRB050820a BVRcIc field photometry
  35. GRB 050820a: NIR Observations by WIRO
  36. GRB 050820B: Swift XRT position
  37. GRB050820B: Refined analysis of the Swift-BAT burst
  38. Swift/UVOT photometry of GRB050820
  39. GRB050820: refined XRT analysis
  40. GRB 050820: Early RAPTOR detections
  41. GRB 050820 Swift-BAT refined analysis
  42. GRB 050820: P60 Temporal Decay Index
  43. GRB 050820: High Resolution Spectroscopy from Keck
  44. GRB050819: refined XRT analysis
  45. GRB050819: RTT150 optical observations
  46. GRB 050820: Swift detection of a GRB
  47. GRB 050819 Swift-BAT refined analysis
  48. GRB050819: Swift XRT position
  49. Swift-BAT trigger 150993 is not a GRB
  50. Swift Trigger 150823 is HETE J1900.1-2455
  51. GRB 050817: Optical observations
  52. GRB 050815: Radio Observation
  53. GRB050814: Radio Observation
  54. GRB050817: Negative Optical Observations
  55. GRB 050814: continued fading
  56. GRB050815: XRT refined analysis
  57. GRB 050813: Radio Observations
  58. GRB050815: Refined analysis of the Swift-BAT burst
  59. GRB 050815: ROTSE-III Optical Limits
  60. GRB050815: Swift XRT afterglow localization
  61. GRB 050730: Third Epoch WSRT Radio Observations
  62. GRB050814: Fading red source
  63. GRB 050813: Gemini Spectra Revisited
  64. GRB050814: P60 Optical Afterglow Candidate
  65. GRB 050813: Non-fading of afterglow candidate
  66. GRB 050814: XRT refined analysis
  67. GRB050814: SWIFT/UVOT observation
  68. GRB050814: Refined analysis of the Swift-BAT burst
  69. GRB050813: Gemini Imaging
  70. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  71. GRB 050814: Swift XRT Afterglow Localization
  72. GRB 050814: Swift detection of a burst
  73. GRB 050813: Magellan detection of a high redshift galaxy cluster
  74. GRB050813: RTT150 optical observations
  75. GRB 050813: I-band observations
  76. GRB050813, SDSS pre-burst observations
  77. GRB 050813: KAIT optical limit
  78. GRB 050813: Swift-BAT refined analysis
  79. GRB 050813: Photometry of object in XRT error circle
  80. GRB050813: SWIFT/UVOT observation
  81. GRB 050813: Swift XRT afterglow localization
  82. RBO GRB 050714A and GRB 050716 observations
  83. Swift-BAT trigger 150131 is not a GRB
  84. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  85. GRB050803: CrAO optical observations, no OT candidate
  86. GRB 050730: WSRT Radio Observations
  87. GRB 050803: PROMPT BVRcIc Observations
  88. GRB 050807: ROTSE-III Optical Limits
  89. GRB 050730, optical observation
  90. GRB050805a : Null detection report
  91. GRB050730, optical observations
  92. GRB050803, optical observations
  93. GRB 050805b: TAROT optical limits
  94. GRB050802: TNG optical observations
  95. GRB050803: Radio Observation
  96. GRB 050803: RTT150 optical observations
  97. GRB050801: Radio Observation
  98. GRB050730: Radio Detection
  99. GRB050803: CrAO optical observations, possible OT candidate
  100. GRB050803: Optical/UV Upper Limits from Swift-UVOT

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