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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"

35963 results found.

  1. GRB030329: further optical photometry and evidence for a light curve discontinuity
  2. GRB 030329: Correction to GCN 2056
  3. GRB 030329: fitting parameters and re-brightening
  4. GRB 030329: KAIT optical photometry
  5. GRB030329 Further RBO Optical Observations
  6. triangulation of GRB 030331 (single error box)
  7. GRB030329 - OT rebrightens
  8. GRB 030329: SARA Optical Observations
  9. AAVSO V & R observations of GRB030329
  10. IPN triangulation of GRB030331 (annulus)
  11. GRB 030329: optical observations
  12. IPN triangulation of GRB030329b (large error box)
  13. GRB 030329: beginning of the new fading phase in optical band
  14. GRB 030329, optical spectroscopy
  15. GRB 030329: fading X-ray afterglow with RXTE
  16. GRB 030329: optical photometry
  17. Photometry of GRB030329 - Constant OT Magnitude
  18. GRB 030329, R-band observations
  19. GRB 030329, R-band light curve
  20. GRB 030329: further optical observations
  21. GRB030329 - OT brightens
  22. GRB 030329: OT observations at Kanazawa
  23. GRB030329 15 GHz radio observation
  24. GRB 030329 RBO V Optical Observations
  25. GRB 030329, optical photometry
  26. GRB030329: Near Infrared Observations
  27. 030331 NOT A GRB
  28. INTEGRAL GRB 030331
  29. GRB 030324: Optical and NIR Observations
  30. GRB 030328, optical photometry
  31. GRB030329: R band light curve by MASTER
  32. GRB030329 - Light curve flattening
  33. GRB 030329: SARA Optical Observations
  34. GRB 030324, optical search
  35. GRB030329 - near contemporaneous optical limits from CONCAM
  36. GRB 030329, optical observations
  37. GRB 030329: Light curve observed during the change of its slope.
  38. GRB030329, BVRcIc field photometry
  39. GRB030329, SPM optical observations
  40. GRB 030329: Optical Decay
  41. Redshift of GRB 030329
  42. GRB030329: ROTSE network observes steepening of decay curve
  43. GRB 030329, optical photometry
  44. GRB 030329: Optical decay and synthesis
  45. GRB 030329: Radio Observations
  46. GRB 030329, optical spectroscopy
  47. GRB 030329: still bright
  48. GRB 030329: Optical pre-Imaging
  49. GRB 030329: visual observations
  50. GRB 030329: Upper limit from 5.6 hours before trigger
  51. GRB030328: R optical observation
  52. GRB 030323: Gemini South VRI obsevations.
  53. GRB030329: Optical observations
  54. GRB 030329, R-band observations, supplement
  55. GRB030329:optical observations by MASTER
  56. GRB 030329: optical observations
  57. GRB 030329, R-band observations
  58. GRB 030329: OT B and R photometry, decline rate
  59. GRB030329: Upper limits from recent and historical observations.
  60. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  61. RXTE detection of GRB 030329 afterglow
  62. GRB 030329: Optical Afterglow Observations
  63. GRB 030329: precise position from Kyoto images
  64. GRB 030328 Optical Observations
  65. GRB 030328: Optical observations
  66. GRB 030328: optical observations
  67. GRB 030329: Optical afterglow fading
  68. GRB 030329 follow-up
  69. GRB 030329: Optical afterglow candidate
  70. GRB 030329: OT candidate
  71. GRB 030329: Optical afterglow candidate
  72. GRB 030328: OT photometry
  73. VLT spectra of GRB 030328
  74. GRB 030328, optical spectroscopy
  75. GRB 030328, optical observations
  76. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  77. GRB 030328: Optical observations
  78. Re: GRB 030328: Finding chart
  79. GRB 030328: Finding chart
  80. GRB 030328: Optical afterglow candidate
  81. GRB030131, BVRcIc field photometry
  82. Possible GRB030323 localized by INTEGRAL
  83. IPN triangulation of GRB030325 (final analysis)
  84. IPN triangulation of GRB030326 (single small error box)
  85. GRB 030323: SARA Optical Observations
  86. IPN triangulation of GRB030325 (single small error box)
  87. GRB030324, optical observations
  88. IPN triangulation of GRB030325 (two small error boxes)
  89. GRB 030324: TAROT optical observations
  90. GRB 030324 (HETE #2641): Optical observations
  91. GRB030324, Optical Observations
  92. GRB030323: Upper limits from recent and historical observations.
  93. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  94. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  95. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  96. VLT/FORS2 spectra of GRB 030323
  97. GRB030323, ROTSE-III detection of possible optical counterpart
  98. GRB030323, optical observations
  99. GRB030324, BVRcIc field photometry
  100. GRB030323, possible optical counterpart

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