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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"

37562 results found.

  1. GRB 030329: Correction to GCN 2056
  2. GRB 030329: fitting parameters and re-brightening
  3. GRB 030329: KAIT optical photometry
  4. GRB030329 Further RBO Optical Observations
  5. triangulation of GRB 030331 (single error box)
  6. GRB030329 - OT rebrightens
  7. GRB 030329: SARA Optical Observations
  8. AAVSO V & R observations of GRB030329
  9. IPN triangulation of GRB030331 (annulus)
  10. GRB 030329: optical observations
  11. IPN triangulation of GRB030329b (large error box)
  12. GRB 030329: beginning of the new fading phase in optical band
  13. GRB 030329, optical spectroscopy
  14. GRB 030329: fading X-ray afterglow with RXTE
  15. GRB 030329: optical photometry
  16. Photometry of GRB030329 - Constant OT Magnitude
  17. GRB 030329, R-band observations
  18. GRB 030329, R-band light curve
  19. GRB 030329: further optical observations
  20. GRB030329 - OT brightens
  21. GRB 030329: OT observations at Kanazawa
  22. GRB030329 15 GHz radio observation
  23. GRB 030329 RBO V Optical Observations
  24. GRB 030329, optical photometry
  25. GRB030329: Near Infrared Observations
  26. 030331 NOT A GRB
  27. INTEGRAL GRB 030331
  28. GRB 030324: Optical and NIR Observations
  29. GRB 030328, optical photometry
  30. GRB030329: R band light curve by MASTER
  31. GRB030329 - Light curve flattening
  32. GRB 030329: SARA Optical Observations
  33. GRB 030324, optical search
  34. GRB030329 - near contemporaneous optical limits from CONCAM
  35. GRB 030329, optical observations
  36. GRB 030329: Light curve observed during the change of its slope.
  37. GRB030329, BVRcIc field photometry
  38. GRB030329, SPM optical observations
  39. GRB 030329: Optical Decay
  40. Redshift of GRB 030329
  41. GRB030329: ROTSE network observes steepening of decay curve
  42. GRB 030329, optical photometry
  43. GRB 030329: Optical decay and synthesis
  44. GRB 030329: Radio Observations
  45. GRB 030329, optical spectroscopy
  46. GRB 030329: still bright
  47. GRB 030329: Optical pre-Imaging
  48. GRB 030329: visual observations
  49. GRB 030329: Upper limit from 5.6 hours before trigger
  50. GRB030328: R optical observation
  51. GRB 030323: Gemini South VRI obsevations.
  52. GRB030329: Optical observations
  53. GRB 030329, R-band observations, supplement
  54. GRB030329:optical observations by MASTER
  55. GRB 030329: optical observations
  56. GRB 030329, R-band observations
  57. GRB 030329: OT B and R photometry, decline rate
  58. GRB030329: Upper limits from recent and historical observations.
  59. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  60. RXTE detection of GRB 030329 afterglow
  61. GRB 030329: Optical Afterglow Observations
  62. GRB 030329: precise position from Kyoto images
  63. GRB 030328 Optical Observations
  64. GRB 030328: Optical observations
  65. GRB 030328: optical observations
  66. GRB 030329: Optical afterglow fading
  67. GRB 030329 follow-up
  68. GRB 030329: Optical afterglow candidate
  69. GRB 030329: OT candidate
  70. GRB 030329: Optical afterglow candidate
  71. GRB 030328: OT photometry
  72. VLT spectra of GRB 030328
  73. GRB 030328, optical spectroscopy
  74. GRB 030328, optical observations
  75. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  76. GRB 030328: Optical observations
  77. Re: GRB 030328: Finding chart
  78. GRB 030328: Finding chart
  79. GRB 030328: Optical afterglow candidate
  80. GRB030131, BVRcIc field photometry
  81. Possible GRB030323 localized by INTEGRAL
  82. IPN triangulation of GRB030325 (final analysis)
  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. IPN triangulation of GRB030325 (two small error boxes)
  88. GRB 030324: TAROT optical observations
  89. GRB 030324 (HETE #2641): Optical observations
  90. GRB030324, Optical Observations
  91. GRB030323: Upper limits from recent and historical observations.
  92. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  93. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  94. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  95. VLT/FORS2 spectra of GRB 030323
  96. GRB030323, ROTSE-III detection of possible optical counterpart
  97. GRB030323, optical observations
  98. GRB030324, BVRcIc field photometry
  99. GRB030323, possible optical counterpart
  100. GRB030323, BVRcIc field calibration

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