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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"

35982 results found.

  1. GRB030329, cessation of fading
  2. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  3. GRB 030329: Sub-millimeter detection
  4. GRB 030329: SARA Optical Observations
  5. GRB 030329: SARA Optical Observations
  6. OT GRB light curves and SN predictions
  7. GRB030329, optical observation
  8. GRB030329, new UBVRcIc field photometry
  9. GRB 030329, light curve and SN prediction
  10. GRB030329: optical observations at Tokyo Tech
  11. GRB 030329: optical observations
  12. GRB030329: multiple re-brightening phases
  13. GRB 030329, BRI photometry
  14. GRB 030329 , SPM optical observations
  15. GRB 030329: Radio observations at GMRT
  16. Further AAVSO V,B,R observations of GRB030329
  17. GRB 030329: Additional Mt. Laguna Optical Observations
  18. GRB 030329: SARA Optical Observations
  19. GRB 030329: Observations with ANDICAM
  20. GRB030329: further optical photometry and evidence for a light curve discontinuity
  21. GRB 030329: Correction to GCN 2056
  22. GRB 030329: fitting parameters and re-brightening
  23. GRB 030329: KAIT optical photometry
  24. GRB030329 Further RBO Optical Observations
  25. triangulation of GRB 030331 (single error box)
  26. GRB030329 - OT rebrightens
  27. GRB 030329: SARA Optical Observations
  28. AAVSO V & R observations of GRB030329
  29. IPN triangulation of GRB030331 (annulus)
  30. GRB 030329: optical observations
  31. IPN triangulation of GRB030329b (large error box)
  32. GRB 030329: beginning of the new fading phase in optical band
  33. GRB 030329, optical spectroscopy
  34. GRB 030329: fading X-ray afterglow with RXTE
  35. GRB 030329: optical photometry
  36. Photometry of GRB030329 - Constant OT Magnitude
  37. GRB 030329, R-band observations
  38. GRB 030329, R-band light curve
  39. GRB 030329: further optical observations
  40. GRB030329 - OT brightens
  41. GRB 030329: OT observations at Kanazawa
  42. GRB030329 15 GHz radio observation
  43. GRB 030329 RBO V Optical Observations
  44. GRB 030329, optical photometry
  45. GRB030329: Near Infrared Observations
  46. 030331 NOT A GRB
  47. INTEGRAL GRB 030331
  48. GRB 030324: Optical and NIR Observations
  49. GRB 030328, optical photometry
  50. GRB030329: R band light curve by MASTER
  51. GRB030329 - Light curve flattening
  52. GRB 030329: SARA Optical Observations
  53. GRB 030324, optical search
  54. GRB030329 - near contemporaneous optical limits from CONCAM
  55. GRB 030329, optical observations
  56. GRB 030329: Light curve observed during the change of its slope.
  57. GRB030329, BVRcIc field photometry
  58. GRB030329, SPM optical observations
  59. GRB 030329: Optical Decay
  60. Redshift of GRB 030329
  61. GRB030329: ROTSE network observes steepening of decay curve
  62. GRB 030329, optical photometry
  63. GRB 030329: Optical decay and synthesis
  64. GRB 030329: Radio Observations
  65. GRB 030329, optical spectroscopy
  66. GRB 030329: still bright
  67. GRB 030329: Optical pre-Imaging
  68. GRB 030329: visual observations
  69. GRB 030329: Upper limit from 5.6 hours before trigger
  70. GRB030328: R optical observation
  71. GRB 030323: Gemini South VRI obsevations.
  72. GRB030329: Optical observations
  73. GRB 030329, R-band observations, supplement
  74. GRB030329:optical observations by MASTER
  75. GRB 030329: optical observations
  76. GRB 030329, R-band observations
  77. GRB 030329: OT B and R photometry, decline rate
  78. GRB030329: Upper limits from recent and historical observations.
  79. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  80. RXTE detection of GRB 030329 afterglow
  81. GRB 030329: Optical Afterglow Observations
  82. GRB 030329: precise position from Kyoto images
  83. GRB 030328 Optical Observations
  84. GRB 030328: Optical observations
  85. GRB 030328: optical observations
  86. GRB 030329: Optical afterglow fading
  87. GRB 030329 follow-up
  88. GRB 030329: Optical afterglow candidate
  89. GRB 030329: OT candidate
  90. GRB 030329: Optical afterglow candidate
  91. GRB 030328: OT photometry
  92. VLT spectra of GRB 030328
  93. GRB 030328, optical spectroscopy
  94. GRB 030328, optical observations
  95. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  96. GRB 030328: Optical observations
  97. Re: GRB 030328: Finding chart
  98. GRB 030328: Finding chart
  99. GRB 030328: Optical afterglow candidate
  100. GRB030131, BVRcIc field photometry

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