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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"

45418 results found.

  1. Photometry of GRB030329 - Constant OT Magnitude
  2. GRB 030329, R-band observations
  3. GRB 030329, R-band light curve
  4. GRB 030329: further optical observations
  5. GRB030329 - OT brightens
  6. GRB 030329: OT observations at Kanazawa
  7. GRB030329 15 GHz radio observation
  8. GRB 030329 RBO V Optical Observations
  9. GRB 030329, optical photometry
  10. GRB030329: Near Infrared Observations
  11. GRB 030324: Optical and NIR Observations
  12. GRB 030328, optical photometry
  13. GRB030329: R band light curve by MASTER
  14. GRB030329 - Light curve flattening
  15. GRB 030329: SARA Optical Observations
  16. GRB 030324, optical search
  17. GRB030329 - near contemporaneous optical limits from CONCAM
  18. GRB030329: R and B observations
  19. GRB 030329, optical observations
  20. GRB030329: Optical observations
  21. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  22. GRB030329a: detection by Konus-Wind
  23. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  24. GRB 030329: Light curve observed during the change of its slope.
  25. GRB030329, BVRcIc field photometry
  26. GRB030329, SPM optical observations
  27. GRB 030329: Optical Decay
  28. Redshift of GRB 030329
  29. GRB030329: ROTSE network observes steepening of decay curve
  30. GRB 030329, optical photometry
  31. GRB 030329: Optical decay and synthesis
  32. GRB030329 optical observations
  33. GRB030329: optical spectroscopy with the TNG
  34. GRB 030329: Radio Observations
  35. GRB 030329, optical spectroscopy
  36. GRB 030329: still bright
  37. GRB 030329: Optical pre-Imaging
  38. GRB 030329: visual observations
  39. GRB 030329: Upper limit from 5.6 hours before trigger
  40. GRB030328: R optical observation
  41. GRB030328: X-ray Afterglow Observed with Chandra
  42. GRB 030323: Gemini South VRI obsevations.
  43. GRB030329: Optical observations
  44. GRB030329 optical observations
  45. GRB030329:optical observations by MASTER
  46. GRB 030329: optical observations
  47. GRB 030329, R-band observations
  48. GRB 030329: OT B and R photometry, decline rate
  49. GRB030329: Upper limits from recent and historical observations.
  50. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  51. RXTE detection of GRB 030329 afterglow
  52. GRB 030329: Optical Afterglow Observations
  53. GRB 030329: precise position from Kyoto images
  54. GRB 030328 Optical Observations
  55. GRB030328: Decay index
  56. GRB 030328: Optical observations
  57. GRB 030328: optical observations
  58. GRB 030329: Optical afterglow fading
  59. GRB 030329 follow-up
  60. GRB 030329: Optical afterglow candidate
  61. GRB 030329: OT candidate
  62. GRB 030329: Optical afterglow candidate
  63. GRB 030328: OT photometry
  64. GRB030328: optical spectroscopy at TNG
  65. GRB030328: optical photometry at the TNG
  66. VLT spectra of GRB 030328
  67. GRB 030328, optical spectroscopy
  68. GRB 030328, optical observations
  69. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  70. GRB 030328: Optical observations
  71. GRB 030328: Optical afterglow candidate
  72. GRB030323 optical observations
  73. GRB030324 optical observation
  74. GRB030131, BVRcIc field photometry
  75. Possible GRB030323 localized by INTEGRAL
  76. IPN triangulation of GRB030325 (final analysis)
  77. GRB030323: Detection on 2003/03/24
  78. IPN triangulation of GRB030326 (single small error box)
  79. GRB 030323: SARA Optical Observations
  80. IPN triangulation of GRB030325 (single small error box)
  81. GRB030324, optical observations
  82. GRB030324, optical observations
  83. IPN triangulation of GRB030325 (two small error boxes)
  84. GRB 030324: TAROT optical observations
  85. GRB030323: V, R, I photometry
  86. GRB 030324 (HETE #2641): Optical observations
  87. GRB030324, Optical Observations
  88. GRB030323: Upper limits from recent and historical observations.
  89. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  90. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  91. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  92. VLT/FORS2 spectra of GRB 030323
  93. GRB030323, ROTSE-III detection of possible optical counterpart
  94. GRB030323, optical observations
  95. GRB030324, BVRcIc field photometry
  96. GRB030323, possible optical counterpart
  97. GRB030323, BVRcIc field calibration
  98. GRB 030324 optical observations
  99. GRB 030320: Optical Observations
  100. GRB 030324, optical observations

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