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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"

41682 results found.

  1. GRB030329: RTT150 optical observations
  2. GRB 030329: Supernova Spectrum Emerging
  3. GRB030329: Kiso B and R band observations
  4. GRB030329: RTT150 optical observation
  5. GRB030329: More AAVSO VR obs
  6. GRB030328: R upper limit after 6 hours by MASTER
  7. GRB 030329: BV photographic observations
  8. GRB 030329: SARA Optical Observations
  9. GRB 030329: SARA Optical Observations
  10. GRB030329, fading resumes
  11. GRB 030329, BVRI photometry
  12. GRB030329: Optical observations
  13. SDSS 0.5m PT observations of GRB030329 (correction)
  14. SDSS 0.5m PT observations of GRB030329
  15. GRB 030329, Optical observations
  16. GRB 030329, nearby galaxies
  17. GRB030329, cessation of fading
  18. GRB030329: final R-band light curve by MASTER
  19. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  20. GRB 030329: Sub-millimeter detection
  21. GRB 030329: SARA Optical Observations
  22. GRB 030329: SARA Optical Observations
  23. OT GRB light curves and SN predictions
  24. GRB030329, optical observation
  25. GRB030329, optical observation
  26. GRB030329, new UBVRcIc field photometry
  27. GRB 030329, light curve and SN prediction
  28. GRB030329: optical observations at Tokyo Tech
  29. GRB 030329: optical observations
  30. GRB030329: multiple re-brightening phases
  31. GRB 030329, BRI photometry
  32. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  33. GRB 030329 , SPM optical observations
  34. GRB030329: Optical observations at Teramo
  35. GRB 030329: Radio observations at GMRT
  36. GRB030329: more 15GHz observations
  37. Further AAVSO V,B,R observations of GRB030329
  38. GRB 030329: Additional Mt. Laguna Optical Observations
  39. GRB 030329: SARA Optical Observations
  40. GRB 030329: Observations with ANDICAM
  41. GRB030329: Optical observations
  42. GRB030329: further optical photometry and evidence for a light curve discontinuity
  43. GRB 030329: Correction to GCN 2056
  44. GRB 030329: fitting parameters and re-brightening
  45. GRB 030329: KAIT optical photometry
  46. GRB030329 Further RBO Optical Observations
  47. triangulation of GRB 030331 (single error box)
  48. GRB030329 - OT rebrightens
  49. GRB 030329: SARA Optical Observations
  50. AAVSO V & R observations of GRB030329
  51. GRB 030329: optical observations
  52. IPN triangulation of GRB030329b (large error box)
  53. GRB 030329: beginning of the new fading phase in optical band
  54. GRB 030329, optical spectroscopy
  55. GRB 030329: fading X-ray afterglow with RXTE
  56. GRB 030329: optical photometry
  57. GRB030329: Optical observations
  58. Photometry of GRB030329 - Constant OT Magnitude
  59. GRB 030329, R-band light curve
  60. GRB 030329: further optical observations
  61. GRB030329 - OT brightens
  62. GRB 030329: OT observations at Kanazawa
  63. GRB030329 15 GHz radio observation
  64. GRB 030329 RBO V Optical Observations
  65. GRB 030329, optical photometry
  66. GRB030329: Near Infrared Observations
  67. GRB 030324: Optical and NIR Observations
  68. GRB 030328, optical photometry
  69. GRB030329: R band light curve by MASTER
  70. GRB030329 - Light curve flattening
  71. GRB 030329: SARA Optical Observations
  72. GRB 030324, optical search
  73. GRB030329 - near contemporaneous optical limits from CONCAM
  74. GRB030329: R and B observations
  75. GRB 030329, optical observations
  76. GRB030329: Optical observations
  77. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  78. GRB030329a: detection by Konus-Wind
  79. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  80. GRB 030329: Light curve observed during the change of its slope.
  81. GRB030329, BVRcIc field photometry
  82. GRB030329, SPM optical observations
  83. GRB 030329: Optical Decay
  84. Redshift of GRB 030329
  85. GRB030329: ROTSE network observes steepening of decay curve
  86. GRB 030329, optical photometry
  87. GRB 030329: Optical decay and synthesis
  88. GRB030329 optical observations
  89. GRB030329: optical spectroscopy with the TNG
  90. GRB 030329: Radio Observations
  91. GRB 030329, optical spectroscopy
  92. GRB 030329: still bright
  93. GRB 030329: Optical pre-Imaging
  94. GRB 030329: visual observations
  95. GRB 030329: Upper limit from 5.6 hours before trigger
  96. GRB030328: R optical observation
  97. GRB030328: X-ray Afterglow Observed with Chandra
  98. GRB 030323: Gemini South VRI obsevations.
  99. GRB030329: Optical observations
  100. GRB030329 optical observations

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