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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"

21575 results found.

  1. GRB000607, A SHORT, HARD BURST
  2. GRB000604, optical observations
  3. GRB000528, optical observations at ESO
  4. GRB 000604 optical observations
  5. GRB 000418: Detection of the Host Galaxy
  6. GRB000604, optical observations, comparison with DPOSS
  7. GRB000604 [IPN Position]
  8. GRB000528, Radio Observations
  9. GRB000529: Optical Observations
  10. New IPN localization of GRB000529
  11. GRB000519: Optical observations
  12. IPN localization of GRB000529
  13. GRB000528: BeppoSAX GRBM observations
  14. GRB 000528 Optical Observations
  15. IPN triangulation of GRB000519
  16. IPN triangulation of GRB000516
  17. Re: GRB000508B : Optical observations
  18. GRB000508B, optical photometry
  19. Possible GRB-related phenomenon
  20. GRB 000424 Optical Observations
  21. The redshift of GRB 000418
  22. GRB000424, optical observations
  23. IPN localization of GRB000429
  24. GRB 000418, optical observation
  25. GRB000424 Optical Observations
  26. GRB000424, optical observations
  27. GRB000424, optical observations
  28. GRB 000424, Optical Observations
  29. GRB 000418, Optical Observation
  30. GRB000418, near-infrared observations
  31. IPN error box for GRB000418
  32. GRB000419 [IPN Position]
  33. GRB000416 Optical Observations
  34. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  35. GRB000416 BRJK observations
  36. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  37. Budget cuts in BeppoSAX operations: impact on GRB observations
  38. GRB 000408, optical observations
  39. Refined IPN error box for GRB000408
  40. GRB000408: Optical CCD Observations from MIRO
  41. GRB000408, lotis optical observations
  42. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  43. GRB000408 [IPN Position]
  44. GRB000326 Optical Observations
  45. GRB000301C - R magnitude lower limit
  46. GRB000326, Further VLA observations
  47. GRB 000323, optical observations
  48. GRB 000326: Optical Observations
  49. GRB000326, Radio observations
  50. GRB000326 [IPN Position]
  51. GRB 000307 optical observations
  52. GRB000323 [IPN Position]
  53. GRB000315 [IPN Positions]
  54. GRB000313, Radio observations
  55. GRB 000313 - optical transient in the BATSE error box
  56. GRB 000307, Optical Observations
  57. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  58. GRB 000301C: HST/STIS CCD Imaging of the field
  59. IPN error box for GRB000307
  60. GRB 000301c: K' observations
  61. GRB000301C, optical R-band observations
  62. GRB000301c - R photometry and nearby faint source confirmation
  63. GRB 000301C, Optical Observation
  64. GRB 000301c: K' observations
  65. GRB 000301C Optical Observations
  66. GRB 000301C: K' Observations
  67. GRB000301C OT candidate optical observations
  68. GRB000301C - Host galaxy not detected in R (?)
  69. Optical observations of GRB000301c
  70. GRB000301C, Radio observations
  71. GRB000301C, Radio observations
  72. GRB000301C optical observations
  73. GRB000301C, near-infrared observations (JHK' imaging)
  74. GRB 000301c near-IR observations
  75. GRB000301C, optical observations
  76. GRB 000301C, Optical Observation
  77. GRB000301C, near-infrared observations (JHK' photometry)
  78. GRB000301c optical observations
  79. GRB 000301A, Radio Observations
  80. GRB000301C, optical observations
  81. GRB000301c, near-infrared observations
  82. Radio observations of the error box of GRB000301A
  83. GRB000301C: RXTE/ASM and IPN localizations
  84. GRB000301A [IPN Position]
  85. GRB000226 [IPN Position]
  86. HST Observations of GRB 990712
  87. GRB 000214 near-IR observations
  88. GRB 000115 Optical observations
  89. GRB 000214, Radio Observations
  90. GRB000210, Radio Observations
  91. Optical observations of GRB000210
  92. GRB 000210: BATSE Observations
  93. Optical observations of the Chandra X-ray source for GRB000210
  94. GRB000210, Radio Observations
  95. Optical candidate for GRB000210
  96. Chandra Observations of GRB000210 X-ray Afterglow
  97. GRB000201, Radio Observations
  98. Optical observations of GRB000131
  99. GRB000201 Optical Observations
  100. GRB 000201: TAROT optical observations

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