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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"

36180 results found.

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

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