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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"

42560 results found.

  1. GRB981220 IPN error box
  2. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  3. BeppoSAX NFI Observation of GRB980425
  4. GRB980329 R,I flux calibration and R,I,K upper limits
  5. GRB980425 Optical Follow-up
  6. GRB980425: X-ray revised positions
  7. GRB 980923 BATSE Observations
  8. SGR1900+14, BeppoSAX-GRBM observations
  9. GRB980703 Very Long Baseline Interferometry
  10. GRB970508 optical observations
  11. GRB971214, association with a Galactic star?
  12. Optical Observations of the Host Galaxy of GRB 980519
  13. GRB980519, Optical Observations
  14. GRB980703 - BeppoSAX/GRBM detection
  15. GRB 980703 (NFI observations)
  16. GRB980703 optical photometry
  17. GRB 980703: BATSE Observations
  18. GRB980703 optical observations
  19. GRB980703: Radio transient
  20. GRB980703 H-band Observations
  21. GRB 980703: Spectrum of the proposed optical counterpart
  22. RXTE Observation of GRB 980706
  23. GRB980703: Spectrum of the proposed optical counterpart
  24. GRB980703 Transient Optical Follow-Up
  25. GRB980703: LOTIS observation at early times
  26. GRB980613 Optical Observations
  27. GRB 980703
  28. GRB980703 (I band observations)
  29. GRB 980703 H-band Observations
  30. GRB980703 (optical R observations)
  31. GRB980706
  32. GRB980703: radio source/optical transient
  33. BeppoSAX NFI observations of GRB 980703
  34. GRB 980703: ASM Position & Intensity
  35. GRB980703
  36. GRB980519 observation report
  37. GRB980703 optical followup
  38. SGR1627-41
  39. Radio observations of SGRs
  40. SGR1900+14 field optical observations
  41. GRB 980613 Near-IR observations
  42. GRB 980613: Optical transient and its host galaxy
  43. SGR1627-41, RXTE/ASM observations
  44. SGR1627-41, Refined IPN annulus location
  45. GRB 980613: Detection of the probable host galaxy
  46. Reduced error box of SGR 1627-41
  47. GRB 980613: BATSE Observations
  48. SGR1627-41, BeppoSAX-GRBM detections
  49. SGR 1627-41
  50. GRB 980613 Optical Observations
  51. GRB 980613 optical observations
  52. Discovery of a new SGR source, SGR1627-41
  53. GRB980613 Optical Observations
  54. GRB980613 observations from Palomar
  55. GRB980613 BeppoSAX-NFI follow up
  56. GRB 980613 new optical/IR observations
  57. GRB 980613 optical/IR obs.
  58. GRB980613 Near Infra-Red Observations
  59. GRB980611
  60. GRB980613, BeppoSAX WFC positions
  61. GRB971214 Secondary Standards
  62. SGR 1900+14
  63. GRB980519 Secondary Standards
  64. SGR1900+14
  65. SGR1900+14
  66. BATSE on-board GRB trigger change
  67. GRB 980519 Optical Observations
  68. GRB980519 optical observations
  69. GRB980519 I-band observations
  70. GRB 980519
  71. GRB980519 optical observations
  72. GRB 980519 Optical Observations
  73. GRB980519 BATSE Observations
  74. GRB970519, optical follow-up at Schmidt Calern
  75. GRB980519 optical observations
  76. GRB980519 Optical Observations
  77. GRB980519 Optical Observations
  78. GRB980519 IPN POSITION
  79. GRB980519 Optical Observations
  80. GRB 980519 Optical Observations
  81. GRB980519 optical observations
  82. GRB980515, BeppoSAX IAUC to be submitted
  83. BATSE on-board GRB trigger change
  84. GRB980519, BeppoSAX-WFC position
  85. BeppoSAX GRB ALERT: updated position of grb980515
  86. GRB 980425 Radio Light Curve
  87. GRB 980425 Brightness Temperature
  88. BSAX Observations of GRB980425 field
  89. IPN web site of GRBs
  90. GRB980425 BATSE observations
  91. SAX J0840.7+2248 Optical Observations
  92. GRB 980425 optical observations
  93. GRB980425: optical obs.
  94. GRB980425: Radio Observations
  95. GRB 980425 optical observations
  96. report on BSAX observations of GRB980425
  97. GRB 980425 optical observations
  98. GRB 980329 ROSAT observation
  99. GRB980326 X-ray Observations
  100. GRB980326, optical observations

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