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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"

36188 results found.

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

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