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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"

32509 results found.

  1. GRB 030329: KAIT optical photometry
  2. GRB030329 Further RBO Optical Observations
  3. triangulation of GRB 030331 (single error box)
  4. GRB030329 - OT rebrightens
  5. GRB 030329: SARA Optical Observations
  6. AAVSO V & R observations of GRB030329
  7. GRB 030329: optical observations
  8. IPN triangulation of GRB030329b (large error box)
  9. GRB 030329: beginning of the new fading phase in optical band
  10. GRB 030329, optical spectroscopy
  11. GRB 030329: fading X-ray afterglow with RXTE
  12. GRB 030329: optical photometry
  13. GRB030329: Optical observations
  14. Photometry of GRB030329 - Constant OT Magnitude
  15. GRB 030329, R-band light curve
  16. GRB 030329: further optical observations
  17. GRB030329 - OT brightens
  18. GRB 030329: OT observations at Kanazawa
  19. GRB030329 15 GHz radio observation
  20. GRB 030329 RBO V Optical Observations
  21. GRB 030329, optical photometry
  22. GRB030329: Near Infrared Observations
  23. GRB 030324: Optical and NIR Observations
  24. GRB 030328, optical photometry
  25. GRB030329: R band light curve by MASTER
  26. GRB030329 - Light curve flattening
  27. GRB 030329: SARA Optical Observations
  28. GRB 030324, optical search
  29. GRB030329 - near contemporaneous optical limits from CONCAM
  30. GRB030329: R and B observations
  31. GRB 030329, optical observations
  32. GRB030329: Optical observations
  33. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  34. GRB030329a: detection by Konus-Wind
  35. GRB 030329: Light curve observed during the change of its slope.
  36. GRB030329, BVRcIc field photometry
  37. GRB030329, SPM optical observations
  38. GRB 030329: Optical Decay
  39. Redshift of GRB 030329
  40. GRB030329: ROTSE network observes steepening of decay curve
  41. GRB 030329, optical photometry
  42. GRB 030329: Optical decay and synthesis
  43. GRB030329 optical observations
  44. GRB030329: optical spectroscopy with the TNG
  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. GRB030328: X-ray Afterglow Observed with Chandra
  53. GRB 030323: Gemini South VRI obsevations.
  54. GRB030329: Optical observations
  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. GRB 030329: Optical Afterglow Observations
  62. GRB 030329: precise position from Kyoto images
  63. GRB 030328 Optical Observations
  64. GRB030328: Decay index
  65. GRB 030328: Optical observations
  66. GRB 030328: optical observations
  67. GRB 030329: Optical afterglow fading
  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: Finding chart
  77. GRB030323 optical observations
  78. GRB030131, BVRcIc field photometry
  79. IPN triangulation of GRB030325 (final analysis)
  80. GRB030323: Detection on 2003/03/24
  81. GRB 030323: SARA Optical Observations
  82. IPN triangulation of GRB030325 (single small error box)
  83. GRB030324, optical observations
  84. GRB030324, optical observations
  85. GRB 030324: TAROT optical observations
  86. GRB030323: V, R, I photometry
  87. GRB 030324 (HETE #2641): Optical observations
  88. GRB030324, Optical Observations
  89. GRB030323: Upper limits from recent and historical observations.
  90. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  91. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  92. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  93. VLT/FORS2 spectra of GRB 030323
  94. GRB030323, ROTSE-III detection of possible optical counterpart
  95. GRB030323, optical observations
  96. GRB030323, possible optical counterpart
  97. GRB 030324 optical observations
  98. GRB 030320: Optical Observations
  99. IPN triangulation of GRB030320 (small error box)
  100. IPN triangulation of GRB030320

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