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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').

18802 results found.

  1. GRB990123, early optical counterpart detection
  2. GRB990123 Optical Observation
  3. Possible identification of SN1999E with GRB980910
  4. Optical Observations of GRB 981220
  5. GRB 981226: radio variable
  6. GRB981220, Optical Observations
  7. GRB 981226 Optical Observations
  8. GRB981226 Optical Observations
  9. GRB981226 BeppoSAX follow up
  10. GRB 981226
  11. GRB 981226 optical observations
  12. GRB981220 B, R and I band observations
  13. Optical Observations of GRB981226
  14. GRB 981220:Optical Observations
  15. GRB 981226 - Infrared Observations
  16. GRB 981226 optical observations
  17. GRB 981220, radio observations
  18. GRB 981220
  19. GRB 980326/Host Galaxy
  20. GRB981220 IPN error box
  21. BeppoSAX NFI Observation of GRB980425
  22. GRB980329 R,I flux calibration and R,I,K upper limits
  23. GRB980425 Optical Follow-up
  24. GRB980425: X-ray revised positions
  25. GRB 980923 BATSE Observations
  26. GRB970508 optical observations
  27. GRB971214, association with a Galactic star?
  28. GRB980519, Optical Observations
  29. GRB980703 - BeppoSAX/GRBM detection
  30. GRB 980703 (NFI observations)
  31. GRB980703 optical photometry
  32. GRB980703 optical observations
  33. GRB980703: Radio transient
  34. RXTE Observation of GRB 980706
  35. GRB980703 Transient Optical Follow-Up
  36. GRB980703: LOTIS observation at early times
  37. GRB980613 Optical Observations
  38. GRB 980703
  39. BeppoSAX NFI observations of GRB 980703
  40. GRB980703 optical followup
  41. Radio observations of SGRs
  42. SGR1900+14 field optical observations
  43. GRB 980613 Near-IR observations
  44. GRB 980613: Optical transient and its host galaxy
  45. SGR1627-41, RXTE/ASM observations
  46. GRB 980613: Detection of the probable host galaxy
  47. GRB 980613 Optical Observations
  48. GRB 980613 optical observations
  49. Discovery of a new SGR source, SGR1627-41
  50. GRB980613 Optical Observations
  51. GRB980613 observations from Palomar
  52. GRB980613 Near Infra-Red Observations
  53. GRB971214 Secondary Standards
  54. GRB980519 Secondary Standards
  55. BATSE on-board GRB trigger change
  56. GRB 980519 Optical Observations
  57. GRB980519 optical observations
  58. GRB 980519
  59. GRB980519 optical observations
  60. GRB 980519 Optical Observations
  61. GRB980519 Optical Observations
  62. GRB 980519 Optical Observations
  63. GRB980515, BeppoSAX IAUC to be submitted
  64. BATSE on-board GRB trigger change
  65. GRB980519, BeppoSAX-WFC updated position
  66. GRB980515: SAX-WFC updated position
  67. GRB 980425 Radio Light Curve
  68. BSAX Observations of GRB980425 field
  69. IPN web site of GRBs
  70. SAX J0840.7+2248 Optical Observations
  71. GRB980425: optical obs.
  72. GRB980425: Radio Observations
  73. report on BSAX observations of GRB980425
  74. GRB 980329 ROSAT observation
  75. GRB980326 X-ray Observations
  76. GRB980326, optical observations
  77. GRB980326, optical observations
  78. GRB980329
  79. GRB980329 Keck K-band observations
  80. GRB980326 optical observations
  81. GRB980329 optical observations
  82. GRB980329 VLA observations
  83. GRB980329 optical observations
  84. GRB980326 optical observations
  85. GRB980326 optical observations
  86. GRB980326 optical observations
  87. Untitled
  88. Untitled
  89. Untitled
  90. Untitled
  91. Untitled
  92. Untitled
  93. Untitled
  94. Untitled
  95. Untitled
  96. Untitled
  97. Untitled
  98. GRB 971214: KPNO Optical Observations
  99. GRB 971214: Optical Observations
  100. Radio Observations of GRB 971214 at the VLA

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