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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"

45423 results found.

  1. GRB 030329: beginning of the new fading phase in optical band
  2. GRB 030329, optical spectroscopy
  3. GRB 030329: fading X-ray afterglow with RXTE
  4. GRB 030329: optical photometry
  5. GRB030329: Optical observations
  6. Photometry of GRB030329 - Constant OT Magnitude
  7. GRB 030329, R-band observations
  8. GRB 030329, R-band light curve
  9. GRB 030329: further optical observations
  10. GRB030329 - OT brightens
  11. GRB 030329: OT observations at Kanazawa
  12. GRB030329 15 GHz radio observation
  13. GRB 030329 RBO V Optical Observations
  14. GRB 030329, optical photometry
  15. GRB030329: Near Infrared Observations
  16. GRB 030324: Optical and NIR Observations
  17. GRB 030328, optical photometry
  18. GRB030329: R band light curve by MASTER
  19. GRB030329 - Light curve flattening
  20. GRB 030329: SARA Optical Observations
  21. GRB 030324, optical search
  22. GRB030329 - near contemporaneous optical limits from CONCAM
  23. GRB030329: R and B observations
  24. GRB 030329, optical observations
  25. GRB030329: Optical observations
  26. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  27. GRB030329a: detection by Konus-Wind
  28. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  29. GRB 030329: Light curve observed during the change of its slope.
  30. GRB030329, BVRcIc field photometry
  31. GRB030329, SPM optical observations
  32. GRB 030329: Optical Decay
  33. Redshift of GRB 030329
  34. GRB030329: ROTSE network observes steepening of decay curve
  35. GRB 030329, optical photometry
  36. GRB 030329: Optical decay and synthesis
  37. GRB030329 optical observations
  38. GRB030329: optical spectroscopy with the TNG
  39. GRB 030329: Radio Observations
  40. GRB 030329, optical spectroscopy
  41. GRB 030329: still bright
  42. GRB 030329: Optical pre-Imaging
  43. GRB 030329: visual observations
  44. GRB 030329: Upper limit from 5.6 hours before trigger
  45. GRB030328: R optical observation
  46. GRB030328: X-ray Afterglow Observed with Chandra
  47. GRB 030323: Gemini South VRI obsevations.
  48. GRB030329: Optical observations
  49. GRB030329 optical observations
  50. GRB030329:optical observations by MASTER
  51. GRB 030329: optical observations
  52. GRB 030329, R-band observations
  53. GRB 030329: OT B and R photometry, decline rate
  54. GRB030329: Upper limits from recent and historical observations.
  55. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  56. RXTE detection of GRB 030329 afterglow
  57. GRB 030329: Optical Afterglow Observations
  58. GRB 030329: precise position from Kyoto images
  59. GRB 030328 Optical Observations
  60. GRB030328: Decay index
  61. GRB 030328: Optical observations
  62. GRB 030328: optical observations
  63. GRB 030329: Optical afterglow fading
  64. GRB 030329 follow-up
  65. GRB 030329: Optical afterglow candidate
  66. GRB 030329: OT candidate
  67. GRB 030329: Optical afterglow candidate
  68. GRB 030328: OT photometry
  69. GRB030328: optical spectroscopy at TNG
  70. GRB030328: optical photometry at the TNG
  71. VLT spectra of GRB 030328
  72. GRB 030328, optical spectroscopy
  73. GRB 030328, optical observations
  74. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  75. GRB 030328: Optical observations
  76. GRB 030328: Optical afterglow candidate
  77. GRB030323 optical observations
  78. GRB030324 optical observation
  79. GRB030131, BVRcIc field photometry
  80. Possible GRB030323 localized by INTEGRAL
  81. IPN triangulation of GRB030325 (final analysis)
  82. GRB030323: Detection on 2003/03/24
  83. IPN triangulation of GRB030326 (single small error box)
  84. GRB 030323: SARA Optical Observations
  85. IPN triangulation of GRB030325 (single small error box)
  86. GRB030324, optical observations
  87. GRB030324, optical observations
  88. IPN triangulation of GRB030325 (two small error boxes)
  89. GRB 030324: TAROT optical observations
  90. GRB030323: V, R, I photometry
  91. GRB 030324 (HETE #2641): Optical observations
  92. GRB030324, Optical Observations
  93. GRB030323: Upper limits from recent and historical observations.
  94. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  95. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  96. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  97. VLT/FORS2 spectra of GRB 030323
  98. GRB030323, ROTSE-III detection of possible optical counterpart
  99. GRB030323, optical observations
  100. GRB030324, BVRcIc field photometry

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