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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"

32757 results found.

  1. GRB 990123: Strong MeV CGRO-COMPTEL detection now posted on WWW
  2. GRB990123: NIR Observation
  3. "GRB 990123: New BV Observations"
  4. GRB 990123 Optical Follow-Up
  5. GRB 990123; Addendum to GCN 223
  6. GRB 990123: BATSE Observations
  7. GRB 990123 Keck Spectrum update
  8. GRB990123 IPN annulus
  9. GRB 990123 : Multiple and Distorted Images of the Host Galaxy?
  10. GRB990123 Optical Observations
  11. GRB 990123 Spectroscopic Redshifts
  12. GRB 990123: New Optical Observations, Decay Measure
  13. GRB 990123 Optical Follow-Up
  14. GRB 990123: Possible Gravitationally Lensed Burst?
  15. GRB990123, optical observation
  16. GRB 990123 optical observations
  17. GRB 990123: Pre-Burst Detection of an Apparent Host Galaxy
  18. GRB 990123 radio observations
  19. GRB 990123, new radio source
  20. GRB990123, Optical observation
  21. GRB 990123: Optical Decay Slope
  22. GRB 990123 r-band photometry
  23. GRB 990123 Optical Follow-up
  24. GRB990123, early optical counterpart detection
  25. GRB990123 Optical Observation
  26. GRB 990123: Bright New Source, Possible Optical Transient
  27. GRB 990123, Radio observations
  28. SN 1999E & GRB 980919
  29. Optical Observations of GRB 981220
  30. GRB 981226: radio variable
  31. GRB981220
  32. GRB981220, Correction to GCN 179
  33. GRB981220, Optical Observations
  34. GRB 981220 Optical observations
  35. GRB 981226 Optical Observations
  36. GRB 980613: Spectroscopy of the host galaxy
  37. GRB981226, sub-millimeter observations
  38. GRB981220, sub-millimeter observations
  39. GRB 981220 and GRB 981226, optical observations
  40. GRB981226 Optical Observations
  41. GRB 981226 radio observations
  42. GRB 981226
  43. radio observations of GRB 981226
  44. GRB981220 B, R and I band observations
  45. Optical Observations of GRB981226
  46. GRB 981220:Optical Observations
  47. GRB 981220 optical R and I observations
  48. GRB981226, BeppoSAX Christmas GRB
  49. GRB 981226 - Infrared Observations
  50. GRB 981220
  51. GRB 981220, radio observations
  52. GRB 981220, radio observations
  53. GRB 981220: BeppoSAX/GRBM results
  54. GRB981220 I-band Observations
  55. GRB 981220
  56. GRB 981220 Optical Observations
  57. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  58. BeppoSAX NFI Observation of GRB980425
  59. GRB980425 Optical Follow-up
  60. GRB980425: X-ray revised positions
  61. GRB980703 Very Long Baseline Interferometry
  62. GRB970508 optical observations
  63. Optical Observations of the Host Galaxy of GRB 980519
  64. GRB980519, Optical Observations
  65. GRB980703, Host galaxy multicolor photometry
  66. GRB 980703 (NFI observations)
  67. GRB980703 optical photometry
  68. GRB 980703: BATSE Observations
  69. GRB980703 optical observations
  70. GRB980703: Radio transient
  71. GRB980703 H-band Observations
  72. GRB 980703: Spectrum of the proposed optical counterpart
  73. RXTE Observation of GRB 980706
  74. GRB980703: Spectrum of the proposed optical counterpart
  75. GRB980703 Transient Optical Follow-Up
  76. GRB980703: LOTIS observation at early times
  77. GRB980613 Optical Observations
  78. GRB 980703
  79. GRB980703 (I band observations)
  80. GRB 980703 H-band Observations
  81. GRB980703: radio source/optical transient
  82. BeppoSAX NFI observations of GRB 980703
  83. GRB980519 observation report
  84. Radio observations of SGRs
  85. GRB 980613 Near-IR observations
  86. GRB980613, optical observations
  87. GRB 980613: Optical transient and its host galaxy
  88. SGR1627-41, RXTE/ASM observations
  89. SGR1627-41, Refined IPN annulus location
  90. GRB 980613: Detection of the probable host galaxy
  91. Reduced error box of SGR 1627-41
  92. SGR1627-41, BeppoSAX-GRBM detections
  93. GRB 980613 Optical Observations
  94. GRB 980613 optical observations
  95. GRB980613 Optical Observations
  96. GRB980613 observations from Palomar
  97. GRB 980613 new optical/IR observations
  98. GRB971214 Secondary Standards
  99. GRB980519 Secondary Standards
  100. SGR1900+14

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