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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"

26499 results found.

  1. X-ray Afterglow of GRB 000529
  2. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  3. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  4. GRB 000528 - WFC measurements
  5. GRB000529: BeppoSAX WFC position
  6. GRB000528: BeppoSAX GRBM observations
  7. GRB 000528 Optical Observations
  8. GRB000519, BVRI field photometry
  9. IPN triangulation of GRB000519
  10. IPN triangulation of GRB000516
  11. GRB000508B, optical photometry
  12. GRB000508B, BVR field photometry
  13. Possible GRB-related phenomenon
  14. RXTE/ASM and IPN localization of GRB 000508B
  15. GRB000424, UBVRI field photometry
  16. GRB000418, UBVRI field photometry update
  17. The redshift of GRB 000418
  18. GRB000424, optical observations
  19. GRB 000429, optical observation
  20. GRB 000429, UBVRI field photometry
  21. IPN localization of GRB000429
  22. GRB 000418, UBVRI field photometry
  23. GRB 000418, optical observation
  24. GRB 000418, Optical Observation
  25. BeppoSAX GRB000424
  26. Correction to IPN error box for GRB000419
  27. IPN error box for GRB000418
  28. GRB000419 [IPN Position]
  29. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  30. GRB000416 BRJK observations
  31. 1SAXJ1715.0-7134 refined position
  32. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  33. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  34. Budget cuts in BeppoSAX operations: impact on GRB observations
  35. GRB 000408, optical observations
  36. GRB 991208, UBVRI field photometry
  37. GRB000301c results
  38. GRB000408, lotis optical observations
  39. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  40. GRB000408 [IPN Position]
  41. GRB000301C - Addendum to GCN 623
  42. GRB000326, Further VLA observations
  43. GRB 000326: Optical Observations
  44. GRB000326, Radio observations
  45. GRB000326 [IPN Position]
  46. GRB 000307 optical observations
  47. GRB000323 [IPN Position]
  48. GRB000315 [IPN Positions]
  49. GRB000313, Radio observations
  50. GRB 000313 - optical transient in the BATSE error box
  51. GRB 000307, Optical Observations
  52. GRB 000307, BVRI Field Photometry
  53. GRB 000301C: Optical Spectrum and Redshift
  54. GRB 000301C: Optical Spectrum and Redshift
  55. GRB 000301C: HST/STIS CCD Imaging of the field
  56. IPN error box for GRB000307
  57. GRB000301C, optical R-band observations
  58. GRB 000301C Optical Observations
  59. GRB 000301C: K' Observations
  60. GRB000301C - Host galaxy not detected in R (?)
  61. Optical observations of GRB000301c
  62. GRB000301C, Radio observations
  63. GRB000301C, Radio observations
  64. GRB000301C, near-infrared observations (JHK' imaging)
  65. GRB 000301c near-IR observations
  66. GRB 000301C, Optical Color
  67. GRB 000301C, UBVRI field photometry
  68. GRB000301C 250 GHz detection
  69. GRB000301C, near-infrared observations (JHK' photometry)
  70. GRB 000301C: OT confirmed
  71. GRB000301c optical observations
  72. GRB000301C
  73. GRB 000301C : Optical Candidate
  74. Radio observations of the error box of GRB000301A
  75. GRB000301A [IPN Position]
  76. GRB000226 [IPN Position]
  77. HST Observations of GRB 990712
  78. GRB 000214 near-IR observations
  79. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  80. GRB000210, Radio Observations
  81. GRB 000115, BVRI field photometry
  82. GRB000214: BeppoSAX GRBM and WFC Detection
  83. IPN annulus for GRB000214
  84. Optical observations of GRB000210
  85. GRB000210 X-ray afterglow
  86. GRB000214: X-ray afterglow candidate
  87. GRB000214 refined BeppoSAX-WFC position
  88. GRB 000210: BATSE Observations
  89. Optical observations of the Chandra X-ray source for GRB000210
  90. GRB000210, Radio Observations
  91. Optical candidate for GRB000210
  92. Chandra Observations of GRB000210 X-ray Afterglow
  93. GRB000210: possible afterglow detection with BeppoSAX NFI
  94. GRB000201, Radio Observations
  95. GRB000210: BeppoSAX GRBM and WFC Detection
  96. Optical observations of GRB000131
  97. GRB000201 Optical Observations
  98. GRB 000131 Optical Observations
  99. BATSE+IPN location of GRB000131
  100. IPN localization of GRB000131

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