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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

45535 results found.

  1. BeppoSAX ALERT: GRB001011
  2. GRB 001007, BVR-band observations
  3. GRB000926 - Amateur Optical Observations
  4. GRB001007: Optical observations
  5. CONCAM null result on GRB001005
  6. IPN triangulation of GRB001007
  7. GRB 000926 : the host galaxy
  8. HETE-2 Launches Successfully
  9. IPN triangulation of GRB001005
  10. HETE-2 48 hour Launch Delay
  11. GRB 000926 Chandra Observation
  12. IPN triangulation of GRB 001004
  13. Public availability of BeppoSAX data of GRB000926
  14. GRB000926: X-ray afterglow by BeppoSAX: revised fluxes (fwd)
  15. GRB000926: X-ray afterglow by BeppoSAX. Refined analysis
  16. GRB000926 - Optical observations
  17. GRB000926 - Optical observations
  18. GRB 000926, Optical Decay
  19. GRB000911: VLT infrared observation
  20. GRB000926 - Optical observations
  21. GRB000926 - Optical observations
  22. GRB 000926: optical observations
  23. GRB 000926, Optical Observations
  24. GRB000926 - Optical observations
  25. GRB000911: optical VLT observations
  26. GRB000926 K'-band Observation
  27. GRB000926 : increasing optical decay slope
  28. GRB000926 optical observations
  29. GRB000926 - Optical observations
  30. J and K band observations of GRB 000926
  31. GRB000911 Optical Observations
  32. GRB 000926: Lightcurve Update and Predictions
  33. GRB 000926, optical observation by Oksanen (vsnet-grb)
  34. GRB000926: X-ray afterglow by BeppoSAX & plan of BSAX & Chandra obs.
  35. GRB000926: Optical observations
  36. CONCAM crude optical limits before and after GRB000926
  37. GRB 000926: Preliminary R-band Lightcurve
  38. GRB 000926 HST/Chandra TOO Status
  39. Spectroscopic Redshift of GRB 000926
  40. GRB 000926, Optical Observation
  41. GRB000926, radio observations
  42. GRB 000926: Optical candidate
  43. Optical candidate for GRB000926
  44. IPN triangulation of GRB000926
  45. IPN triangulation of GRB000926
  46. GRB 000911, BVRI field photometry
  47. GRB000911: Corrected coordinates
  48. GRB000911: Sub-millimeter observations
  49. IPN triangulation of GRB000925
  50. GRB000911: Optical Transient
  51. GRB000911, Radio and Optical observations
  52. GRB000911, Radio observations
  53. GRB000911: Optical observations
  54. IPN triangulation of GRB000911
  55. IPN triangulation of GRB000910
  56. False GRB alarm from RXTE/ASM on 8 Sept 2000
  57. GRB 000830: Optical observations
  58. GRB000830: Optical observations
  59. GRB000830, TNG B-band observations
  60. GRB000830, BVRI field photometry
  61. GRB000830: Optical observations
  62. GRB000210, Optical observations
  63. Chandra Position of GRB000210
  64. "Snapshot" afterglow IDs and GRB 000830
  65. GRB000830: Optical observations
  66. IPN triangulation of GRB000830
  67. HST/STIS observations of the host galaxy of GRB 980329
  68. HST/STIS observations of the chaotic environment of GRB 980613
  69. IPN localization of GRB000820
  70. SGR 1806-20 burst activity
  71. GRB000812, TNG R-band observations
  72. GRB000801 & GRB000730, Gamma Ray Observations
  73. GRB000730, Gamma Ray Observations
  74. GRB000812, Radio observations
  75. IPN localization of GRB000812
  76. IPN localization of GRB000811
  77. GRB000801, Gamma Ray Observations
  78. GRB000801, VLT-Antu R-band observations
  79. GRB000301C, UBVI optical observations
  80. GRB000801, Radio Observations
  81. GRB 991208 Host Galaxy Imaging
  82. Updated IPN coordinates for GRB000801
  83. IPN localization of GRB000801
  84. IPN localization of GRB000801
  85. IPN localization of GRB000730B
  86. IPN localization of GRB000730B
  87. IPN localization of GRB000730
  88. GRB 990510: Possible detection of a host galaxy
  89. GRB 990510 Host Galaxy Discovery
  90. GRB 000727, optical observations
  91. IPN localization of GRB000727
  92. GRB 990705, HST/STIS observations of the host galaxy
  93. GRB 990712: Late time HST/STIS Observations
  94. GRB 991216, HST/STIS observations
  95. GRB000620, Radio Observations
  96. GRB981226, HST/STIS observations of the host galaxy
  97. GRB000630, optical observations
  98. GRB 000630: Detection of the Optical Afterglow
  99. GRB000630, Revised BVRI Field Photometry
  100. GRB000630, Optical Observations

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Download all Circulars as a .tar.gz archive (updated once a day):
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