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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"

35953 results found.

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

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Download all Circulars as a .tar.gz archive (updated once a day):
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