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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').
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"

35350 results found.

  1. GRB981220, sub-millimeter observations
  2. GRB 981220 and GRB 981226, optical observations
  3. GRB 981226 radio observations
  4. GRB 981226
  5. GRB 981226 optical observations
  6. radio observations of GRB 981226
  7. GRB981220 B, R and I band observations
  8. GRB 981220:Optical Observations
  9. GRB 981220 optical R and I observations
  10. GRB981226, BeppoSAX Christmas GRB
  11. GRB 981226 - Infrared Observations
  12. GRB 981226 optical observations
  13. GRB 981220
  14. GRB 981220, radio observations
  15. GRB981226 Optical Observation
  16. GRB 981220, radio observations
  17. GRB 981220: BeppoSAX/GRBM results
  18. GRB981220 I-band Observations
  19. GRB 981220
  20. GRB 981220 Optical Observations
  21. GRB 981220, optical observations
  22. GRB 980326/Host Galaxy
  23. GRB981220 IPN error box
  24. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  25. GRB980329 R,I flux calibration and R,I,K upper limits
  26. GRB980425: X-ray revised positions
  27. GRB 980923 BATSE Observations
  28. GRB980703 Very Long Baseline Interferometry
  29. GRB970508 optical observations
  30. GRB971214, association with a Galactic star?
  31. Optical Observations of the Host Galaxy of GRB 980519
  32. GRB980519, Optical Observations
  33. GRB980703, Host galaxy multicolor photometry
  34. GRB980703 - BeppoSAX/GRBM detection
  35. GRB 980703 (NFI observations)
  36. GRB980703 optical photometry
  37. GRB 980703: BATSE Observations
  38. GRB980703: Radio transient
  39. GRB980703 H-band Observations
  40. GRB 980703: Spectrum of the proposed optical counterpart
  41. RXTE Observation of GRB 980706
  42. GRB980703: Spectrum of the proposed optical counterpart
  43. GRB980703 Transient Optical Follow-Up
  44. GRB980703: LOTIS observation at early times
  45. GRB980613 Optical Observations
  46. GRB 980703
  47. GRB 980703 H-band Observations
  48. GRB980703 (optical R observations)
  49. GRB980706
  50. GRB980703: radio source/optical transient
  51. BeppoSAX NFI observations of GRB 980703
  52. GRB 980703: ASM Position & Intensity
  53. GRB980703
  54. GRB980703 optical followup
  55. GRB 980613 Near-IR observations
  56. GRB980613, optical observations
  57. GRB 980613: Optical transient and its host galaxy
  58. GRB 980613: Detection of the probable host galaxy
  59. GRB 980613: BATSE Observations
  60. GRB 980613 Optical Observations
  61. GRB 980613 optical observations
  62. GRB980613 Optical Observations
  63. GRB980613 observations from Palomar
  64. GRB980613 BeppoSAX-NFI follow up
  65. GRB 980613 new optical/IR observations
  66. GRB 980613 optical/IR obs.
  67. GRB980613 Near Infra-Red Observations
  68. GRB980611
  69. GRB980613, BeppoSAX WFC positions
  70. GRB971214 Secondary Standards
  71. GRB980519 Secondary Standards
  72. BATSE on-board GRB trigger change
  73. GRB 980519 Optical Observations
  74. GRB980519 optical observations
  75. GRB 980519
  76. GRB980519 optical observations
  77. GRB 980519 Optical Observations
  78. GRB980519 BATSE Observations
  79. GRB970519, optical follow-up at Schmidt Calern
  80. GRB980519 optical observations
  81. GRB980519 Optical Observations
  82. GRB980519 Optical Observations
  83. GRB980519 IPN POSITION
  84. GRB980519 Optical Observations
  85. GRB 980519 Optical Observations
  86. GRB980519 optical observations
  87. GRB980515, BeppoSAX IAUC to be submitted
  88. BATSE on-board GRB trigger change
  89. BeppoSAX GRB ALERT: updated position of grb980515
  90. GRB 980425 Radio Light Curve
  91. GRB 980425 Brightness Temperature
  92. GRB980425 BATSE observations
  93. SAX J0840.7+2248 Optical Observations
  94. GRB 980425 optical observations
  95. GRB980425: optical obs.
  96. GRB980425: Radio Observations
  97. GRB 980425 optical observations
  98. GRB 980425 optical observations
  99. GRB 980329 ROSAT observation
  100. GRB980326 X-ray Observations

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