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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"

44286 results found.

  1. GRB 981226 optical observations
  2. radio observations of GRB 981226
  3. GRB981220 B, R and I band observations
  4. GRB981226, BeppoSAX-NFI follow-up
  5. Optical Observations of GRB981226
  6. GRB 981220:Optical Observations
  7. GRB 981220 optical R and I observations
  8. GRB981226, BeppoSAX Christmas GRB
  9. GRB 981226 - Infrared Observations
  10. GRB 981226 optical observations
  11. GRB 981220
  12. GRB 981220, radio observations
  13. GRB981226 Optical Observation
  14. GRB 981220, radio observations
  15. GRB 981220: BeppoSAX/GRBM results
  16. GRB981220 I-band Observations
  17. GRB981220 Optical Observations
  18. GRB 981220
  19. GRB 981220 Optical Observations
  20. GRB 981220, optical observations
  21. GRB 980326/Host Galaxy
  22. GRB981220 IPN error box
  23. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  24. BeppoSAX NFI Observation of GRB980425
  25. GRB980329 R,I flux calibration and R,I,K upper limits
  26. GRB980425 Optical Follow-up
  27. GRB980425: X-ray revised positions
  28. GRB 980923 BATSE Observations
  29. SGR1900+14, BeppoSAX-GRBM observations
  30. GRB980703 Very Long Baseline Interferometry
  31. GRB970508 optical observations
  32. GRB971214, association with a Galactic star?
  33. Optical Observations of the Host Galaxy of GRB 980519
  34. GRB980519, Optical Observations
  35. GRB980703, Host galaxy multicolor photometry
  36. GRB980703 - BeppoSAX/GRBM detection
  37. GRB 980703 (NFI observations)
  38. GRB980703 optical photometry
  39. GRB 980703: BATSE Observations
  40. GRB980703 optical observations
  41. GRB980703: Radio transient
  42. GRB980703 H-band Observations
  43. GRB 980703: Spectrum of the proposed optical counterpart
  44. RXTE Observation of GRB 980706
  45. GRB980703: Spectrum of the proposed optical counterpart
  46. GRB980703 Transient Optical Follow-Up
  47. GRB980703: LOTIS observation at early times
  48. GRB980613 Optical Observations
  49. GRB 980703
  50. GRB980703 (I band observations)
  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. GRB980519 observation report
  59. GRB980703 optical followup
  60. SGR1627-41
  61. Radio observations of SGRs
  62. SGR1900+14 field optical observations
  63. GRB 980613 Near-IR observations
  64. GRB980613, optical observations
  65. GRB 980613: Optical transient and its host galaxy
  66. SGR1627-41, RXTE/ASM observations
  67. SGR1627-41, Refined IPN annulus location
  68. GRB 980613: Detection of the probable host galaxy
  69. Reduced error box of SGR 1627-41
  70. GRB 980613: BATSE Observations
  71. SGR1627-41, BeppoSAX-GRBM detections
  72. SGR 1627-41
  73. GRB 980613 Optical Observations
  74. GRB 980613 optical observations
  75. Discovery of a new SGR source, SGR1627-41
  76. GRB980613 Optical Observations
  77. GRB980613 observations from Palomar
  78. GRB980613 BeppoSAX-NFI follow up
  79. GRB 980613 new optical/IR observations
  80. GRB 980613 optical/IR obs.
  81. GRB980613 Near Infra-Red Observations
  82. GRB980611
  83. GRB980613, BeppoSAX WFC positions
  84. GRB971214 Secondary Standards
  85. SGR 1900+14
  86. GRB980519 Secondary Standards
  87. SGR1900+14
  88. SGR1900+14
  89. BATSE on-board GRB trigger change
  90. GRB 980519 Optical Observations
  91. GRB980519 optical observations
  92. GRB980519 I-band observations
  93. GRB 980519
  94. GRB980519 optical observations
  95. GRB 980519 Optical Observations
  96. GRB980519 BATSE Observations
  97. GRB970519, optical follow-up at Schmidt Calern
  98. GRB980519 optical observations
  99. GRB980519 Optical Observations
  100. GRB980519 Optical Observations

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