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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"

35260 results found.

  1. SN 1999E & GRB 980919
  2. Possible identification of SN1999E with GRB980910
  3. Optical Observations of GRB 981220
  4. GRB 981226: radio variable
  5. GRB981220
  6. GRB981220, Optical Observations
  7. GRB 981220 Optical observations
  8. GRB 981226 Optical Observations
  9. GRB 980613: Spectroscopy of the host galaxy
  10. GRB981226, sub-millimeter observations
  11. GRB981220, sub-millimeter observations
  12. GRB 981220 and GRB 981226, optical observations
  13. GRB 981226 radio observations
  14. GRB 981226
  15. GRB 981226 optical observations
  16. radio observations of GRB 981226
  17. GRB981220 B, R and I band observations
  18. GRB 981220:Optical Observations
  19. GRB 981220 optical R and I observations
  20. GRB981226, BeppoSAX Christmas GRB
  21. GRB 981226 - Infrared Observations
  22. GRB 981226 optical observations
  23. GRB 981220
  24. GRB 981220, radio observations
  25. GRB981226 Optical Observation
  26. GRB 981220, radio observations
  27. GRB 981220: BeppoSAX/GRBM results
  28. GRB981220 I-band Observations
  29. GRB 981220
  30. GRB 981220 Optical Observations
  31. GRB 981220, optical observations
  32. GRB 980326/Host Galaxy
  33. GRB981220 IPN error box
  34. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  35. GRB980329 R,I flux calibration and R,I,K upper limits
  36. GRB980425: X-ray revised positions
  37. GRB 980923 BATSE Observations
  38. GRB980703 Very Long Baseline Interferometry
  39. GRB970508 optical observations
  40. GRB971214, association with a Galactic star?
  41. Optical Observations of the Host Galaxy of GRB 980519
  42. GRB980519, Optical Observations
  43. GRB980703, Host galaxy multicolor photometry
  44. GRB980703 - BeppoSAX/GRBM detection
  45. GRB 980703 (NFI observations)
  46. GRB980703 optical photometry
  47. GRB 980703: BATSE Observations
  48. GRB980703: Radio transient
  49. GRB980703 H-band Observations
  50. GRB 980703: Spectrum of the proposed optical counterpart
  51. RXTE Observation of GRB 980706
  52. GRB980703: Spectrum of the proposed optical counterpart
  53. GRB980703 Transient Optical Follow-Up
  54. GRB980703: LOTIS observation at early times
  55. GRB980613 Optical Observations
  56. GRB 980703
  57. GRB 980703 H-band Observations
  58. GRB980703 (optical R observations)
  59. GRB980706
  60. GRB980703: radio source/optical transient
  61. BeppoSAX NFI observations of GRB 980703
  62. GRB 980703: ASM Position & Intensity
  63. GRB980703
  64. GRB980703 optical followup
  65. GRB 980613 Near-IR observations
  66. GRB980613, optical observations
  67. GRB 980613: Optical transient and its host galaxy
  68. GRB 980613: Detection of the probable host galaxy
  69. GRB 980613: BATSE Observations
  70. GRB 980613 Optical Observations
  71. GRB 980613 optical observations
  72. GRB980613 Optical Observations
  73. GRB980613 observations from Palomar
  74. GRB980613 BeppoSAX-NFI follow up
  75. GRB 980613 new optical/IR observations
  76. GRB 980613 optical/IR obs.
  77. GRB980613 Near Infra-Red Observations
  78. GRB980611
  79. GRB980613, BeppoSAX WFC positions
  80. GRB971214 Secondary Standards
  81. GRB980519 Secondary Standards
  82. BATSE on-board GRB trigger change
  83. GRB 980519 Optical Observations
  84. GRB980519 optical observations
  85. GRB 980519
  86. GRB980519 optical observations
  87. GRB 980519 Optical Observations
  88. GRB980519 BATSE Observations
  89. GRB970519, optical follow-up at Schmidt Calern
  90. GRB980519 optical observations
  91. GRB980519 Optical Observations
  92. GRB980519 Optical Observations
  93. GRB980519 IPN POSITION
  94. GRB980519 Optical Observations
  95. GRB 980519 Optical Observations
  96. GRB980519 optical observations
  97. GRB980515, BeppoSAX IAUC to be submitted
  98. BATSE on-board GRB trigger change
  99. BeppoSAX GRB ALERT: updated position of grb980515
  100. GRB 980425 Radio Light Curve

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