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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"

26305 results found.

  1. GRB971214, association with a Galactic star?
  2. Optical Observations of the Host Galaxy of GRB 980519
  3. GRB980519, Optical Observations
  4. GRB 980703 (NFI observations)
  5. GRB980703 optical photometry
  6. GRB 980703: BATSE Observations
  7. GRB980703 optical observations
  8. GRB980703: Radio transient
  9. GRB980703 H-band Observations
  10. GRB 980703: Spectrum of the proposed optical counterpart
  11. GRB980703: Spectrum of the proposed optical counterpart
  12. GRB980703 Transient Optical Follow-Up
  13. GRB980703: LOTIS observation at early times
  14. GRB980613 Optical Observations
  15. GRB980703 (I band observations)
  16. GRB 980703 H-band Observations
  17. GRB980703 (optical R observations)
  18. GRB980703: radio source/optical transient
  19. Radio observations of SGRs
  20. SGR1900+14 field optical observations
  21. GRB 980613 Near-IR observations
  22. GRB980613, optical observations
  23. GRB 980613: Optical transient and its host galaxy
  24. GRB 980613: Detection of the probable host galaxy
  25. GRB 980613: BATSE Observations
  26. SGR1627-41, BeppoSAX-GRBM detections
  27. SGR 1627-41
  28. GRB 980613 optical observations
  29. GRB980613 Optical Observations
  30. GRB980613 observations from Palomar
  31. GRB980613 BeppoSAX-NFI follow up
  32. GRB 980613 new optical/IR observations
  33. GRB 980613 optical/IR obs.
  34. GRB980611
  35. GRB980613, BeppoSAX WFC positions
  36. GRB971214 Secondary Standards
  37. SGR 1900+14
  38. GRB980519 Secondary Standards
  39. SGR1900+14
  40. GRB 980519 Optical Observations
  41. GRB980519 optical observations
  42. GRB980519 I-band observations
  43. GRB 980519
  44. GRB980519 optical observations
  45. GRB980519 BATSE Observations
  46. GRB970519, optical follow-up at Schmidt Calern
  47. GRB980519 optical observations
  48. GRB980519 Optical Observations
  49. GRB980519 Optical Observations
  50. GRB980519 IPN POSITION
  51. GRB980519 Optical Observations
  52. GRB 980519 Optical Observations
  53. GRB980519 optical observations
  54. GRB980515, BeppoSAX IAUC to be submitted
  55. GRB980519, BeppoSAX-WFC updated position
  56. GRB980519, BeppoSAX-WFC position
  57. BeppoSAX GRB ALERT: updated position of grb980515
  58. GRB 980425 Radio Light Curve
  59. GRB980425 BATSE observations
  60. GRB980425: optical obs.
  61. GRB980425: Radio Observations
  62. GRB 980425 optical observations
  63. report on BSAX observations of GRB980425
  64. GRB 980425 optical observations
  65. GRB980326, optical observations
  66. GRB980326, optical observations
  67. GRB980329, Fading IR counterpart to radio source
  68. GRB980326 IPN annulus
  69. GRB980329 Keck K-band observations
  70. GRB980329 sub-millimeter observations
  71. GRB980329 IPN annulus
  72. GRB980329 optical observations
  73. GRB980329 near-IR observations
  74. GRB980329 near-IR observations
  75. GRB980329 infrared observations
  76. GRB980329 optical observations
  77. GRB980326 optical observations
  78. GRB980329 optical observations
  79. GRB980329 optical observations
  80. GRB980329 optical observations
  81. GRB980326 optical observations
  82. GRB970508 SAO RAS optical observations
  83. Optical Observations of GRB 970508
  84. GRB 971214: Redshift from Keck Observations
  85. Near-IR follow-up on GRB 971227
  86. GRB971214: Keck R & I-band Observations
  87. GRB 971227: Optical Observations
  88. Optical Observations of the GRB 971227 field
  89. Optical Observations on GRB 971227
  90. GRB971227: Plaskett R-band observations
  91. GRB 971227: Optical clarifications
  92. GRB971227: Further CAHA R-band images
  93. GRB971227: LOTIS observations
  94. GRB 971227: CAHA R-band images
  95. GRB971214: Optical Observations and Calibrations
  96. GRB 971214: Apache Point Observatory Optical Observations
  97. GRB 971214: KPNO Optical Observations
  98. Optical Observations of GRB 971214 at Keck
  99. GRB 971214: Optical Observations
  100. Radio Observations of GRB 971214 at the VLA

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