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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"

41457 results found.

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

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