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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"
  1. GRB981226, BeppoSAX Christmas GRB
  2. GRB 981226 - Infrared Observations
  3. GRB 981226 optical observations
  4. GRB 981220
  5. GRB 981220, radio observations
  6. GRB981226 Optical Observation
  7. GRB 981220, radio observations
  8. GRB 981220: BeppoSAX/GRBM results
  9. GRB981220 I-band Observations
  10. GRB981220 Optical Observations
  11. GRB 981220
  12. GRB 981220 Optical Observations
  13. GRB 981220, optical observations
  14. GRB 980326/Host Galaxy
  15. GRB981220 IPN error box
  16. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  17. BeppoSAX NFI Observation of GRB980425
  18. GRB980329 R,I flux calibration and R,I,K upper limits
  19. GRB980425 Optical Follow-up
  20. GRB980425: X-ray revised positions
  21. GRB 980923 BATSE Observations
  22. SGR1900+14, BeppoSAX-GRBM observations
  23. GRB980703 Very Long Baseline Interferometry
  24. GRB970508 optical observations
  25. GRB971214, association with a Galactic star?
  26. Optical Observations of the Host Galaxy of GRB 980519
  27. GRB980519, Optical Observations
  28. GRB980703, Host galaxy multicolor photometry
  29. GRB980703 - BeppoSAX/GRBM detection
  30. GRB 980703 (NFI observations)
  31. GRB980703 optical photometry
  32. GRB 980703: BATSE Observations
  33. GRB980703 optical observations
  34. GRB980703: Radio transient
  35. GRB980703 H-band Observations
  36. GRB 980703: Spectrum of the proposed optical counterpart
  37. RXTE Observation of GRB 980706
  38. GRB980703: Spectrum of the proposed optical counterpart
  39. GRB980703 Transient Optical Follow-Up
  40. GRB980703: LOTIS observation at early times
  41. GRB980613 Optical Observations
  42. GRB 980703
  43. GRB980703 (I band observations)
  44. GRB 980703 H-band Observations
  45. GRB980703 (optical R observations)
  46. GRB980706
  47. GRB980703: radio source/optical transient
  48. BeppoSAX NFI observations of GRB 980703
  49. GRB 980703: ASM Position & Intensity
  50. GRB980703
  51. GRB980519 observation report
  52. GRB980703 optical followup
  53. SGR1627-41
  54. Radio observations of SGRs
  55. SGR1900+14 field optical observations
  56. GRB 980613 Near-IR observations
  57. GRB980613, optical observations
  58. GRB 980613: Optical transient and its host galaxy
  59. SGR1627-41, RXTE/ASM observations
  60. SGR1627-41, Refined IPN annulus location
  61. GRB 980613: Detection of the probable host galaxy
  62. Reduced error box of SGR 1627-41
  63. GRB 980613: BATSE Observations
  64. SGR1627-41, BeppoSAX-GRBM detections
  65. SGR 1627-41
  66. GRB 980613 Optical Observations
  67. GRB 980613 optical observations
  68. Discovery of a new SGR source, SGR1627-41
  69. GRB980613 Optical Observations
  70. GRB980613 observations from Palomar
  71. GRB980613 BeppoSAX-NFI follow up
  72. GRB 980613 new optical/IR observations
  73. GRB 980613 optical/IR obs.
  74. GRB980613 Near Infra-Red Observations
  75. GRB980611
  76. GRB980613, BeppoSAX WFC positions
  77. GRB971214 Secondary Standards
  78. SGR 1900+14
  79. GRB980519 Secondary Standards
  80. SGR1900+14
  81. SGR1900+14
  82. BATSE on-board GRB trigger change
  83. GRB 980519 Optical Observations
  84. GRB980519 optical observations
  85. GRB980519 I-band observations
  86. GRB 980519
  87. GRB980519 optical observations
  88. GRB 980519 Optical Observations
  89. GRB980519 BATSE Observations
  90. GRB970519, optical follow-up at Schmidt Calern
  91. GRB980519 optical observations
  92. GRB980519 Optical Observations
  93. GRB980519 Optical Observations
  94. GRB980519 IPN POSITION
  95. GRB980519 Optical Observations
  96. GRB 980519 Optical Observations
  97. GRB980519 optical observations
  98. GRB980515, BeppoSAX IAUC to be submitted
  99. BATSE on-board GRB trigger change
  100. GRB980519, BeppoSAX-WFC updated position

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