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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').
  1. GRB981220 B, R and I band observations
  2. GRB981226, BeppoSAX-NFI follow-up
  3. Optical Observations of GRB981226
  4. GRB 981220:Optical Observations
  5. GRB 981220 optical R and I observations
  6. GRB981226, BeppoSAX Christmas GRB
  7. GRB 981226 - Infrared Observations
  8. GRB 981226 optical observations
  9. GRB 981220
  10. GRB 981220, radio observations
  11. GRB981226 Optical Observation
  12. GRB 981220, radio observations
  13. GRB 981220: BeppoSAX/GRBM results
  14. GRB981220 I-band Observations
  15. GRB981220 Optical Observations
  16. GRB 981220
  17. GRB 981220 Optical Observations
  18. GRB 981220, optical observations
  19. GRB 980326/Host Galaxy
  20. GRB981220 IPN error box
  21. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  22. BeppoSAX NFI Observation of GRB980425
  23. GRB980329 R,I flux calibration and R,I,K upper limits
  24. GRB980425 Optical Follow-up
  25. GRB980425: X-ray revised positions
  26. GRB 980923 BATSE Observations
  27. SGR1900+14, BeppoSAX-GRBM observations
  28. GRB980703 Very Long Baseline Interferometry
  29. GRB970508 optical observations
  30. GRB971214, association with a Galactic star?
  31. Optical Observations of the Host Galaxy of GRB 980519
  32. GRB980519, Optical Observations
  33. GRB980703, Host galaxy multicolor photometry
  34. GRB980703 - BeppoSAX/GRBM detection
  35. GRB 980703 (NFI observations)
  36. GRB980703 optical photometry
  37. GRB 980703: BATSE Observations
  38. GRB980703 optical observations
  39. GRB980703: Radio transient
  40. GRB980703 H-band Observations
  41. GRB 980703: Spectrum of the proposed optical counterpart
  42. RXTE Observation of GRB 980706
  43. GRB980703: Spectrum of the proposed optical counterpart
  44. GRB980703 Transient Optical Follow-Up
  45. GRB980703: LOTIS observation at early times
  46. GRB980613 Optical Observations
  47. GRB 980703
  48. GRB980703 (I band observations)
  49. GRB 980703 H-band Observations
  50. GRB980703 (optical R observations)
  51. GRB980706
  52. GRB980703: radio source/optical transient
  53. BeppoSAX NFI observations of GRB 980703
  54. GRB 980703: ASM Position & Intensity
  55. GRB980703
  56. GRB980519 observation report
  57. GRB980703 optical followup
  58. SGR1627-41
  59. Radio observations of SGRs
  60. SGR1900+14 field optical observations
  61. GRB 980613 Near-IR observations
  62. GRB980613, optical observations
  63. GRB 980613: Optical transient and its host galaxy
  64. SGR1627-41, RXTE/ASM observations
  65. SGR1627-41, Refined IPN annulus location
  66. GRB 980613: Detection of the probable host galaxy
  67. Reduced error box of SGR 1627-41
  68. GRB 980613: BATSE Observations
  69. SGR1627-41, BeppoSAX-GRBM detections
  70. SGR 1627-41
  71. GRB 980613 Optical Observations
  72. GRB 980613 optical observations
  73. Discovery of a new SGR source, SGR1627-41
  74. GRB980613 Optical Observations
  75. GRB980613 observations from Palomar
  76. GRB980613 BeppoSAX-NFI follow up
  77. GRB 980613 new optical/IR observations
  78. GRB 980613 optical/IR obs.
  79. GRB980613 Near Infra-Red Observations
  80. GRB980611
  81. GRB980613, BeppoSAX WFC positions
  82. GRB971214 Secondary Standards
  83. SGR 1900+14
  84. GRB980519 Secondary Standards
  85. SGR1900+14
  86. SGR1900+14
  87. BATSE on-board GRB trigger change
  88. GRB 980519 Optical Observations
  89. GRB980519 optical observations
  90. GRB980519 I-band observations
  91. GRB 980519
  92. GRB980519 optical observations
  93. GRB 980519 Optical Observations
  94. GRB980519 BATSE Observations
  95. GRB970519, optical follow-up at Schmidt Calern
  96. GRB980519 optical observations
  97. GRB980519 Optical Observations
  98. GRB980519 Optical Observations
  99. GRB980519 IPN POSITION
  100. GRB980519 Optical Observations

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