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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"

26497 results found.

  1. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  2. GRB 000528 - WFC measurements
  3. GRB000529: BeppoSAX WFC position
  4. GRB000528: BeppoSAX GRBM observations
  5. GRB 000528 Optical Observations
  6. GRB000519, BVRI field photometry
  7. IPN triangulation of GRB000519
  8. IPN triangulation of GRB000516
  9. GRB000508B, optical photometry
  10. GRB000508B, BVR field photometry
  11. Possible GRB-related phenomenon
  12. RXTE/ASM and IPN localization of GRB 000508B
  13. GRB000424, UBVRI field photometry
  14. GRB000418, UBVRI field photometry update
  15. The redshift of GRB 000418
  16. GRB000424, optical observations
  17. GRB 000429, optical observation
  18. GRB 000429, UBVRI field photometry
  19. IPN localization of GRB000429
  20. GRB 000418, UBVRI field photometry
  21. GRB 000418, optical observation
  22. GRB 000418, Optical Observation
  23. BeppoSAX GRB000424
  24. Correction to IPN error box for GRB000419
  25. IPN error box for GRB000418
  26. GRB000419 [IPN Position]
  27. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  28. GRB000416 BRJK observations
  29. 1SAXJ1715.0-7134 refined position
  30. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  31. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  32. Budget cuts in BeppoSAX operations: impact on GRB observations
  33. GRB 000408, optical observations
  34. GRB 991208, UBVRI field photometry
  35. GRB000301c results
  36. GRB000408, lotis optical observations
  37. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  38. GRB000408 [IPN Position]
  39. GRB000301C - Addendum to GCN 623
  40. GRB000326, Further VLA observations
  41. GRB 000326: Optical Observations
  42. GRB000326, Radio observations
  43. GRB000326 [IPN Position]
  44. GRB 000307 optical observations
  45. GRB000323 [IPN Position]
  46. GRB000315 [IPN Positions]
  47. GRB000313, Radio observations
  48. GRB 000313 - optical transient in the BATSE error box
  49. GRB 000307, Optical Observations
  50. GRB 000307, BVRI Field Photometry
  51. GRB 000301C: Optical Spectrum and Redshift
  52. GRB 000301C: Optical Spectrum and Redshift
  53. GRB 000301C: HST/STIS CCD Imaging of the field
  54. IPN error box for GRB000307
  55. GRB000301C, optical R-band observations
  56. GRB 000301C Optical Observations
  57. GRB 000301C: K' Observations
  58. GRB000301C - Host galaxy not detected in R (?)
  59. Optical observations of GRB000301c
  60. GRB000301C, Radio observations
  61. GRB000301C, Radio observations
  62. GRB000301C, near-infrared observations (JHK' imaging)
  63. GRB 000301c near-IR observations
  64. GRB 000301C, Optical Color
  65. GRB 000301C, UBVRI field photometry
  66. GRB000301C 250 GHz detection
  67. GRB000301C, near-infrared observations (JHK' photometry)
  68. GRB 000301C: OT confirmed
  69. GRB000301c optical observations
  70. GRB000301C
  71. GRB 000301C : Optical Candidate
  72. Radio observations of the error box of GRB000301A
  73. GRB000301A [IPN Position]
  74. GRB000226 [IPN Position]
  75. HST Observations of GRB 990712
  76. GRB 000214 near-IR observations
  77. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  78. GRB000210, Radio Observations
  79. GRB 000115, BVRI field photometry
  80. GRB000214: BeppoSAX GRBM and WFC Detection
  81. IPN annulus for GRB000214
  82. Optical observations of GRB000210
  83. GRB000210 X-ray afterglow
  84. GRB000214: X-ray afterglow candidate
  85. GRB000214 refined BeppoSAX-WFC position
  86. GRB 000210: BATSE Observations
  87. Optical observations of the Chandra X-ray source for GRB000210
  88. GRB000210, Radio Observations
  89. Optical candidate for GRB000210
  90. Chandra Observations of GRB000210 X-ray Afterglow
  91. GRB000210: possible afterglow detection with BeppoSAX NFI
  92. GRB000201, Radio Observations
  93. GRB000210: BeppoSAX GRBM and WFC Detection
  94. Optical observations of GRB000131
  95. GRB000201 Optical Observations
  96. GRB 000131 Optical Observations
  97. BATSE+IPN location of GRB000131
  98. IPN localization of GRB000131
  99. GRB 000126, optical observations
  100. IPN localization of GRB000126

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