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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"

35237 results found.

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

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