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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27557 results found.

  1. Kiso observation of the GRB030329 at April 6
  2. GRB 030329 Optical observations
  3. GRB 030329, color evolution
  4. GRB 030329: possible color change
  5. GRB030329: RTT150 optical observations
  6. GRB 030329: Supernova Spectrum Emerging
  7. GRB030329: Kiso B and R band observations
  8. GRB030329: RTT150 optical observation
  9. GRB 030329: SARA Optical Observations
  10. GRB 030329: SARA Optical Observations
  11. GRB030329, fading resumes
  12. GRB 030329, Optical observations
  13. GRB 030329, nearby galaxies
  14. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  15. GRB 030329: Sub-millimeter detection
  16. GRB 030329: SARA Optical Observations
  17. GRB 030329: SARA Optical Observations
  18. GRB030329, new UBVRcIc field photometry
  19. GRB 030329, light curve and SN prediction
  20. GRB030329: optical observations at Tokyo Tech
  21. GRB 030329: optical observations
  22. GRB030329: multiple re-brightening phases
  23. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  24. GRB 030329 , SPM optical observations
  25. GRB 030329: Radio observations at GMRT
  26. Further AAVSO V,B,R observations of GRB030329
  27. GRB 030329: SARA Optical Observations
  28. GRB 030329: Observations with ANDICAM
  29. GRB030329: further optical photometry and evidence for a light curve discontinuity
  30. GRB 030329: fitting parameters and re-brightening
  31. GRB 030329: KAIT optical photometry
  32. GRB030329 Further RBO Optical Observations
  33. GRB 030329: SARA Optical Observations
  34. AAVSO V & R observations of GRB030329
  35. GRB 030329: beginning of the new fading phase in optical band
  36. GRB 030329, optical spectroscopy
  37. GRB 030329: fading X-ray afterglow with RXTE
  38. GRB 030329: optical photometry
  39. GRB 030329, R-band observations
  40. GRB 030329, R-band light curve
  41. GRB 030329: further optical observations
  42. GRB 030329: OT observations at Kanazawa
  43. GRB 030329 RBO V Optical Observations
  44. GRB 030329, optical photometry
  45. GRB030329: Near Infrared Observations
  46. GRB 030328, optical photometry
  47. GRB 030329: SARA Optical Observations
  48. GRB 030329, optical observations
  49. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  50. GRB030329a: detection by Konus-Wind
  51. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  52. GRB 030329: Light curve observed during the change of its slope.
  53. GRB030329, SPM optical observations
  54. GRB 030329: Optical Decay
  55. Redshift of GRB 030329
  56. GRB 030329, optical photometry
  57. GRB 030329: Optical decay and synthesis
  58. GRB030329: optical spectroscopy with the TNG
  59. GRB 030329: Radio Observations
  60. GRB 030329, optical spectroscopy
  61. GRB 030329: still bright
  62. GRB 030329: Optical pre-Imaging
  63. GRB 030329: visual observations
  64. GRB030328: R optical observation
  65. GRB030328: X-ray Afterglow Observed with Chandra
  66. GRB 030323: Gemini South VRI obsevations.
  67. GRB 030329: optical observations
  68. GRB 030329, R-band observations
  69. RXTE detection of GRB 030329 afterglow
  70. GRB 030329: Optical Afterglow Observations
  71. GRB 030329: precise position from Kyoto images
  72. GRB 030328 Optical Observations
  73. GRB030328: Decay index
  74. GRB 030329: Optical afterglow fading
  75. GRB 030329 follow-up
  76. GRB 030329: Optical afterglow candidate
  77. GRB 030329: Optical afterglow candidate
  78. GRB030328: optical spectroscopy at TNG
  79. GRB030328: optical photometry at the TNG
  80. VLT spectra of GRB 030328
  81. GRB 030328, optical spectroscopy
  82. GRB 030328, optical observations
  83. GRB 030328: Optical observations
  84. GRB 030328: Finding chart
  85. GRB 030328: Optical afterglow candidate
  86. GRB030131, BVRcIc field photometry
  87. Possible GRB030323 localized by INTEGRAL
  88. GRB030323: Detection on 2003/03/24
  89. GRB 030323: SARA Optical Observations
  90. GRB030324, optical observations
  91. GRB030323: V, R, I photometry
  92. GRB 030324 (HETE #2641): Optical observations
  93. VLT/FORS2 spectra of GRB 030323
  94. GRB030323, ROTSE-III detection of possible optical counterpart
  95. Possible GRB 030320 localized by INTEGRAL
  96. GRB 030226 Optical observations
  97. GRB030226: Analysis of Chandra data
  98. Chandra detection of the X-ray afterglow of GRB 030226
  99. GRB 030226, further optical/NIR imaging
  100. GRB 030226: Ic Observations

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