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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"

36082 results found.

  1. GRB 030329, light curve and SN prediction
  2. GRB030329: optical observations at Tokyo Tech
  3. GRB 030329: optical observations
  4. GRB030329: multiple re-brightening phases
  5. GRB 030329, BRI photometry
  6. GRB 030329 , SPM optical observations
  7. GRB 030329: Radio observations at GMRT
  8. Further AAVSO V,B,R observations of GRB030329
  9. GRB 030329: Additional Mt. Laguna Optical Observations
  10. GRB 030329: SARA Optical Observations
  11. GRB 030329: Observations with ANDICAM
  12. GRB030329: further optical photometry and evidence for a light curve discontinuity
  13. GRB 030329: Correction to GCN 2056
  14. GRB 030329: fitting parameters and re-brightening
  15. GRB 030329: KAIT optical photometry
  16. GRB030329 Further RBO Optical Observations
  17. triangulation of GRB 030331 (single error box)
  18. GRB030329 - OT rebrightens
  19. GRB 030329: SARA Optical Observations
  20. AAVSO V & R observations of GRB030329
  21. IPN triangulation of GRB030331 (annulus)
  22. GRB 030329: optical observations
  23. IPN triangulation of GRB030329b (large error box)
  24. GRB 030329: beginning of the new fading phase in optical band
  25. GRB 030329, optical spectroscopy
  26. GRB 030329: fading X-ray afterglow with RXTE
  27. GRB 030329: optical photometry
  28. Photometry of GRB030329 - Constant OT Magnitude
  29. GRB 030329, R-band observations
  30. GRB 030329, R-band light curve
  31. GRB 030329: further optical observations
  32. GRB030329 - OT brightens
  33. GRB 030329: OT observations at Kanazawa
  34. GRB030329 15 GHz radio observation
  35. GRB 030329 RBO V Optical Observations
  36. GRB 030329, optical photometry
  37. GRB030329: Near Infrared Observations
  38. 030331 NOT A GRB
  39. INTEGRAL GRB 030331
  40. GRB 030324: Optical and NIR Observations
  41. GRB 030328, optical photometry
  42. GRB030329: R band light curve by MASTER
  43. GRB030329 - Light curve flattening
  44. GRB 030329: SARA Optical Observations
  45. GRB 030324, optical search
  46. GRB030329 - near contemporaneous optical limits from CONCAM
  47. GRB 030329, optical observations
  48. GRB 030329: Light curve observed during the change of its slope.
  49. GRB030329, BVRcIc field photometry
  50. GRB030329, SPM optical observations
  51. GRB 030329: Optical Decay
  52. Redshift of GRB 030329
  53. GRB030329: ROTSE network observes steepening of decay curve
  54. GRB 030329, optical photometry
  55. GRB 030329: Optical decay and synthesis
  56. GRB 030329: Radio Observations
  57. GRB 030329, optical spectroscopy
  58. GRB 030329: still bright
  59. GRB 030329: Optical pre-Imaging
  60. GRB 030329: visual observations
  61. GRB 030329: Upper limit from 5.6 hours before trigger
  62. GRB030328: R optical observation
  63. GRB 030323: Gemini South VRI obsevations.
  64. GRB030329: Optical observations
  65. GRB 030329, R-band observations, supplement
  66. GRB030329:optical observations by MASTER
  67. GRB 030329: optical observations
  68. GRB 030329, R-band observations
  69. GRB 030329: OT B and R photometry, decline rate
  70. GRB030329: Upper limits from recent and historical observations.
  71. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  72. RXTE detection of GRB 030329 afterglow
  73. GRB 030329: Optical Afterglow Observations
  74. GRB 030329: precise position from Kyoto images
  75. GRB 030328 Optical Observations
  76. GRB 030328: Optical observations
  77. GRB 030328: optical observations
  78. GRB 030329: Optical afterglow fading
  79. GRB 030329 follow-up
  80. GRB 030329: Optical afterglow candidate
  81. GRB 030329: OT candidate
  82. GRB 030329: Optical afterglow candidate
  83. GRB 030328: OT photometry
  84. VLT spectra of GRB 030328
  85. GRB 030328, optical spectroscopy
  86. GRB 030328, optical observations
  87. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  88. GRB 030328: Optical observations
  89. Re: GRB 030328: Finding chart
  90. GRB 030328: Finding chart
  91. GRB 030328: Optical afterglow candidate
  92. GRB030131, BVRcIc field photometry
  93. Possible GRB030323 localized by INTEGRAL
  94. IPN triangulation of GRB030325 (final analysis)
  95. IPN triangulation of GRB030326 (single small error box)
  96. GRB 030323: SARA Optical Observations
  97. IPN triangulation of GRB030325 (single small error box)
  98. GRB030324, optical observations
  99. IPN triangulation of GRB030325 (two small error boxes)
  100. GRB 030324: TAROT optical observations

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