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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"

36149 results found.

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

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