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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"

36007 results found.

  1. IPN triangulation of GRB001204 (short/hard)
  2. GRB 001105, further optical observations
  3. GRB001120: Gunn-i observations
  4. GRB001120: Optical observations
  5. GRB001109, optical observations
  6. GRB001120, optical observations
  7. IPN triangulation of GRB001120
  8. Optical/NIR observations of GRB001109
  9. GRB 001109: deep JHK upper limits
  10. GRB 001109 X-ray afterglow with BeppoSAX
  11. GRB001109: Optical observations
  12. GRB001109: BeppoSAX/NFI Observations
  13. GRB001109, R-band optical observations
  14. GRB001109, Radio observations
  15. BeppoSAX ALERT: GRB001109
  16. GRB001105 BVRI field photometry correction
  17. GRB001105, BVRI field photometry
  18. GRB 001105, R-band observation
  19. IPN TRIANGULATION OF GRB001105
  20. GRB 001025B, Optical obervations
  21. GRB 991208: HST Imaging of the Host Galaxy
  22. GRB000926: R-image of the host galaxy
  23. GRB 001025B, I-band observations
  24. GRB 001025 Optical Observations
  25. GRB 001025A, optical observation
  26. IPN TRIANGULATION OF GRB001025B (SHORT/HARD)
  27. IPN triangulation of GRB001025
  28. ASM Localization of GRB 001025
  29. GRB001007, Radio observations
  30. IPN TRIANGULATION OF GRB001020
  31. GRB001019, Optical Observations
  32. GRB 001018, Possible Radio Afterglow
  33. GRB001018, Gamma Ray Observations
  34. IPN TRIANGULATION OF GRB001019
  35. IPN TRIANGULATION OF GRB001018
  36. IPN TRIANGULATION OF GRB 001017
  37. GRB 000926: Improved Absorber Redshift
  38. V,R,I band observations of GRB000926
  39. The Likely Optical/Infrared Afterglow of GRB 001011
  40. HETE positions added to GCN
  41. BeppoSAX ALERT: GRB001011
  42. GRB 001007, BVR-band observations
  43. GRB000926 - Amateur Optical Observations
  44. CONCAM null result on GRB001005
  45. IPN triangulation of GRB001007
  46. GRB 000926 : the host galaxy
  47. IPN triangulation of GRB001005
  48. GRB 000926 Chandra Observation
  49. IPN triangulation of GRB 001004
  50. Public availability of BeppoSAX data of GRB000926
  51. GRB000926: X-ray afterglow by BeppoSAX. Refined analysis
  52. GRB 000926, Optical Decay
  53. GRB000926 - Optical observations
  54. GRB000926 - Optical observations
  55. GRB 000926: optical observations
  56. GRB 000926, Optical Observations
  57. GRB000926 K'-band Observation
  58. GRB000926 : increasing optical decay slope
  59. GRB000926 optical observations
  60. GRB000926 - Optical observations
  61. Re: GRB 000926, optical observation by Oksanen (vsnet-grb)
  62. J and K band observations of GRB 000926
  63. GRB 000926: Lightcurve Update and Predictions
  64. GRB 000926, optical observation by Oksanen (vsnet-grb)
  65. GRB000926: X-ray afterglow by BeppoSAX & plan of BSAX & Chandra obs.
  66. CONCAM crude optical limits before and after GRB000926
  67. GRB 000926: Preliminary R-band Lightcurve
  68. GRB 000926 HST/Chandra TOO Status
  69. Spectroscopic Redshift of GRB 000926
  70. GRB 000926, Optical Observation
  71. GRB 000926: Optical candidate
  72. Optical candidate for GRB000926
  73. IPN triangulation of GRB000926
  74. GRB 000911, BVRI field photometry
  75. GRB000911: Sub-millimeter observations
  76. IPN triangulation of GRB000925
  77. IPN triangulation of GRB000911
  78. IPN triangulation of GRB000910
  79. False GRB alarm from RXTE/ASM on 8 Sept 2000
  80. GRB 000830: Optical observations
  81. GRB000830: Optical observations
  82. GRB000830, TNG B-band observations
  83. GRB000830, BVRI field photometry
  84. GRB000830: Optical observations
  85. GRB000210, Optical observations
  86. Chandra Position of GRB000210
  87. "Snapshot" afterglow IDs and GRB 000830
  88. IPN triangulation of GRB000830
  89. HST/STIS observations of the host galaxy of GRB 980329
  90. HST/STIS observations of the chaotic environment of GRB 980613
  91. IPN localization of GRB000820
  92. GRB000801 & GRB000730, Gamma Ray Observations
  93. GRB000730, Gamma Ray Observations
  94. GRB000812, Radio observations
  95. IPN localization of GRB000812
  96. IPN localization of GRB000811
  97. GRB000801, Gamma Ray Observations
  98. GRB000801, VLT-Antu R-band observations
  99. GRB 991208 Host Galaxy Imaging
  100. Updated IPN coordinates for GRB000801

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