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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"

26494 results found.

  1. GRB 980923 BATSE Observations
  2. GRB980703 Very Long Baseline Interferometry
  3. GRB970508 optical observations
  4. GRB980519, Optical Observations
  5. GRB980703 - BeppoSAX/GRBM detection
  6. GRB 980703 (NFI observations)
  7. GRB980703 optical photometry
  8. GRB 980703: BATSE Observations
  9. GRB980703 optical observations
  10. GRB980703: Radio transient
  11. GRB 980703: Spectrum of the proposed optical counterpart
  12. RXTE Observation of GRB 980706
  13. GRB980703 Transient Optical Follow-Up
  14. GRB980703: LOTIS observation at early times
  15. GRB980613 Optical Observations
  16. GRB 980703
  17. GRB980703 (optical R observations)
  18. BeppoSAX NFI observations of GRB 980703
  19. GRB 980703: ASM Position & Intensity
  20. GRB980703 optical followup
  21. Radio observations of SGRs
  22. SGR1900+14 field optical observations
  23. GRB 980613: Optical transient and its host galaxy
  24. SGR1627-41, RXTE/ASM observations
  25. GRB 980613: Detection of the probable host galaxy
  26. GRB 980613: BATSE Observations
  27. GRB 980613 Optical Observations
  28. GRB 980613 optical observations
  29. Discovery of a new SGR source, SGR1627-41
  30. GRB980613 Optical Observations
  31. GRB980613 observations from Palomar
  32. GRB980613 Near Infra-Red Observations
  33. GRB980613, BeppoSAX WFC positions
  34. GRB971214 Secondary Standards
  35. GRB980519 Secondary Standards
  36. SGR1900+14
  37. SGR1900+14
  38. BATSE on-board GRB trigger change
  39. GRB 980519 Optical Observations
  40. GRB 980519
  41. GRB980519 optical observations
  42. GRB 980519 Optical Observations
  43. GRB980519 BATSE Observations
  44. GRB980519 Optical Observations
  45. GRB 980519 Optical Observations
  46. GRB980519 optical observations
  47. GRB980515, BeppoSAX IAUC to be submitted
  48. BATSE on-board GRB trigger change
  49. GRB980519, BeppoSAX-WFC updated position
  50. BeppoSAX GRB ALERT: updated position of grb980515
  51. BSAX Observations of GRB980425 field
  52. IPN web site of GRBs
  53. GRB980425 BATSE observations
  54. SAX J0840.7+2248 Optical Observations
  55. GRB980425: optical obs.
  56. GRB980425: Radio Observations
  57. report on BSAX observations of GRB980425
  58. GRB 980329 ROSAT observation
  59. GRB980326 X-ray Observations
  60. GRB980326, optical observations
  61. GRB980326, optical observations
  62. GRB980329
  63. GRB980329 Keck K-band observations
  64. GRB980329 sub-millimeter observations
  65. GRB980329 IPN annulus
  66. GRB980329 optical observations
  67. GRB980329 near-IR observations
  68. GRB980326 optical observations
  69. GRB980329 optical observations
  70. GRB980329 VLA observations
  71. GRB980329 optical observations
  72. GRB980326 optical observations
  73. GRB980326 optical observations
  74. GRB980326 optical observations
  75. GRB970508 SAO RAS optical observations
  76. Optical Observations of GRB 970508
  77. Near-IR follow-up on GRB 971227
  78. GRB971214: Keck R & I-band Observations
  79. Optical Observations of the GRB 971227 field
  80. Optical Observations on GRB 971227
  81. GRB971227: Plaskett R-band observations
  82. GRB 971227: Optical clarifications
  83. GRB971227: Further CAHA R-band images
  84. GRB971227: LOTIS observations
  85. GRB971214: Optical Observations and Calibrations
  86. GRB 971214: EUVE Observations
  87. GRB 971214: KPNO Optical Observations
  88. GRB 971214: Optical Observations
  89. Radio Observations of GRB 971214 at the VLA
  90. GRB 971214: USNOFS Observations Summary
  91. GRB 971024: KPNO Optical Observations Summary
  92. GRB 971024: KPNO Optical Observations
  93. Possible new SGR from US Naval Observatory
  94. GRB 970828: Palomar Observations

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