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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"

35254 results found.

  1. GRB 981220 Optical observations
  2. GRB 981226 Optical Observations
  3. GRB 980613: Spectroscopy of the host galaxy
  4. GRB981226, sub-millimeter observations
  5. GRB981220, sub-millimeter observations
  6. GRB 981220 and GRB 981226, optical observations
  7. GRB 981226 radio observations
  8. GRB 981226
  9. GRB 981226 optical observations
  10. radio observations of GRB 981226
  11. GRB981220 B, R and I band observations
  12. GRB 981220:Optical Observations
  13. GRB 981220 optical R and I observations
  14. GRB981226, BeppoSAX Christmas GRB
  15. GRB 981226 - Infrared Observations
  16. GRB 981226 optical observations
  17. GRB 981220
  18. GRB 981220, radio observations
  19. GRB981226 Optical Observation
  20. GRB 981220, radio observations
  21. GRB 981220: BeppoSAX/GRBM results
  22. GRB981220 I-band Observations
  23. GRB 981220
  24. GRB 981220 Optical Observations
  25. GRB 981220, optical observations
  26. GRB 980326/Host Galaxy
  27. GRB981220 IPN error box
  28. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  29. GRB980329 R,I flux calibration and R,I,K upper limits
  30. GRB980425: X-ray revised positions
  31. GRB 980923 BATSE Observations
  32. GRB980703 Very Long Baseline Interferometry
  33. GRB970508 optical observations
  34. GRB971214, association with a Galactic star?
  35. Optical Observations of the Host Galaxy of GRB 980519
  36. GRB980519, Optical Observations
  37. GRB980703, Host galaxy multicolor photometry
  38. GRB980703 - BeppoSAX/GRBM detection
  39. GRB 980703 (NFI observations)
  40. GRB980703 optical photometry
  41. GRB 980703: BATSE Observations
  42. GRB980703: Radio transient
  43. GRB980703 H-band Observations
  44. GRB 980703: Spectrum of the proposed optical counterpart
  45. RXTE Observation of GRB 980706
  46. GRB980703: Spectrum of the proposed optical counterpart
  47. GRB980703 Transient Optical Follow-Up
  48. GRB980703: LOTIS observation at early times
  49. GRB980613 Optical Observations
  50. GRB 980703
  51. GRB 980703 H-band Observations
  52. GRB980703 (optical R observations)
  53. GRB980706
  54. GRB980703: radio source/optical transient
  55. BeppoSAX NFI observations of GRB 980703
  56. GRB 980703: ASM Position & Intensity
  57. GRB980703
  58. GRB980703 optical followup
  59. GRB 980613 Near-IR observations
  60. GRB980613, optical observations
  61. GRB 980613: Optical transient and its host galaxy
  62. GRB 980613: Detection of the probable host galaxy
  63. GRB 980613: BATSE Observations
  64. GRB 980613 Optical Observations
  65. GRB 980613 optical observations
  66. GRB980613 Optical Observations
  67. GRB980613 observations from Palomar
  68. GRB980613 BeppoSAX-NFI follow up
  69. GRB 980613 new optical/IR observations
  70. GRB 980613 optical/IR obs.
  71. GRB980613 Near Infra-Red Observations
  72. GRB980611
  73. GRB980613, BeppoSAX WFC positions
  74. GRB971214 Secondary Standards
  75. GRB980519 Secondary Standards
  76. BATSE on-board GRB trigger change
  77. GRB 980519 Optical Observations
  78. GRB980519 optical observations
  79. GRB 980519
  80. GRB980519 optical observations
  81. GRB 980519 Optical Observations
  82. GRB980519 BATSE Observations
  83. GRB970519, optical follow-up at Schmidt Calern
  84. GRB980519 optical observations
  85. GRB980519 Optical Observations
  86. GRB980519 Optical Observations
  87. GRB980519 IPN POSITION
  88. GRB980519 Optical Observations
  89. GRB 980519 Optical Observations
  90. GRB980519 optical observations
  91. GRB980515, BeppoSAX IAUC to be submitted
  92. BATSE on-board GRB trigger change
  93. BeppoSAX GRB ALERT: updated position of grb980515
  94. GRB 980425 Radio Light Curve
  95. GRB 980425 Brightness Temperature
  96. GRB980425 BATSE observations
  97. SAX J0840.7+2248 Optical Observations
  98. GRB 980425 optical observations
  99. GRB980425: optical obs.
  100. GRB980425: Radio Observations

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