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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"

32564 results found.

  1. False GRB alarm from RXTE/ASM on 8 Sept 2000
  2. GRB 000830: Optical observations
  3. GRB000830: Optical observations
  4. GRB000830, TNG B-band observations
  5. GRB000830: Optical observations
  6. GRB000210, Optical observations
  7. Chandra Position of GRB000210
  8. GRB000830: Optical observations
  9. HST/STIS observations of the host galaxy of GRB 980329
  10. HST/STIS observations of the chaotic environment of GRB 980613
  11. GRB000812, TNG R-band observations
  12. GRB000801 & GRB000730, Gamma Ray Observations
  13. GRB000812, Radio observations
  14. GRB000801, VLT-Antu R-band observations
  15. GRB000301C, UBVI optical observations
  16. GRB000801, Radio Observations
  17. GRB 991208 Host Galaxy Imaging
  18. Updated IPN coordinates for GRB000801
  19. IPN localization of GRB000801
  20. IPN localization of GRB000730B
  21. GRB 990510: Possible detection of a host galaxy
  22. GRB 990510 Host Galaxy Discovery
  23. GRB 000727, optical observations
  24. GRB 990705, HST/STIS observations of the host galaxy
  25. GRB 990712: Late time HST/STIS Observations
  26. GRB 991216, HST/STIS observations
  27. GRB000620, Radio Observations
  28. GRB981226, HST/STIS observations of the host galaxy
  29. GRB000630, optical observations
  30. GRB 000630: Detection of the Optical Afterglow
  31. GRB000630, Revised BVRI Field Photometry
  32. GRB000630, Optical Observations
  33. GRB000630, optical observations
  34. GRB000630, optical observations
  35. GRB000630, optical observations
  36. GRB000630, optical observations
  37. GRB000630: Optical observations
  38. GRB000630, Radio Observations
  39. possible optical counterpart of GRB 000630
  40. GRB 000623, optical observations
  41. GRB 000620, optical observations
  42. GRB000418, HST/STIS Observations
  43. GRB990123: Late-time HST/STIS observations of the host
  44. GRB 990506, HST/STIS Observations of the Host Galaxy
  45. GRB 000620: J-band observations
  46. GRB000620, optical observations
  47. GRB000615: H-band observations
  48. GRB990308, HST/STIS observations of the host galaxy
  49. GRB000620 - Optical observations
  50. GRB000620 Optical observations
  51. IPN annulus for GRB000620
  52. GRB000615, Radio observations
  53. GRB000607, optical observations
  54. GRB 000615: NIR further observations
  55. GRB990123, HST/STIS observations of the host galaxy
  56. GRB000616 optical observations
  57. GRB 000615, near-infrared observations
  58. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  59. GRB000615, further R-band photometry
  60. GRB 000615: NIR observations
  61. GRB000615, R-band photometry
  62. GRB980425, HST/STIS observations of the host galaxy
  63. The Hosts of GRB 980703 and GRB 971214
  64. GRB 000301C: Further Late-Time HST/STIS observations
  65. GRB000528: follow-up X-ray measurements and update of IPN annulus
  66. Optical Follow-up of GRB000529 Error Box
  67. GRB000607, Radio Observations
  68. GRB000604 optical non-detection
  69. GRB000604 - Optical observations
  70. GRB000604, optical observations
  71. GRB000528, optical observations at ESO
  72. GRB 000604 optical observations
  73. GRB 000418: Detection of the Host Galaxy
  74. GRB000604, optical observations, comparison with DPOSS
  75. GRB000528, Radio Observations
  76. X-ray Afterglow of GRB 000529
  77. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  78. IPN localization and time history of GRB000528
  79. New IPN localization of GRB000529
  80. GRB000519: Optical observations
  81. IPN localization of GRB000529
  82. GRB 000528 - WFC measurements
  83. IPN triangulation of GRB000519
  84. Re: GRB000508B : Optical observations
  85. GRB 000418, Optical observation
  86. GRB000508B, optical photometry
  87. Possible GRB-related phenomenon
  88. GRB 000424 Optical Observations
  89. The redshift of GRB 000418
  90. GRB000424, optical observations
  91. GRB 000429, optical observation
  92. GRB000418, Radio detection
  93. GRB000418, K'-band photometry
  94. GRB 000418, Optical Observation
  95. GRB 000418, optical observation
  96. GRB000424 Optical Observations
  97. GRB 000418, Optical Observation
  98. GRB000424, optical observations
  99. GRB000424, optical observations
  100. GRB 000424, Optical Observations

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