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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"

24873 results found.

  1. GRB 000615: NIR observations
  2. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  3. GRB000615, R-band photometry
  4. The Hosts of GRB 980703 and GRB 971214
  5. GRB 000301C: Further Late-Time HST/STIS observations
  6. GRB000528: follow-up X-ray measurements and update of IPN annulus
  7. GRB980519, HST/STIS observations of the host galaxy
  8. GRB000604 optical non-detection
  9. GRB000604 - Optical observations
  10. GRB000604, optical observations
  11. GRB000528, optical observations at ESO
  12. GRB 000604 optical observations
  13. GRB 000418: Detection of the Host Galaxy
  14. GRB000604, optical observations, comparison with DPOSS
  15. GRB000528, Radio Observations
  16. X-ray Afterglow of GRB 000529
  17. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  18. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  19. GRB 000528 - WFC measurements
  20. GRB000519, BVRI field photometry
  21. IPN triangulation of GRB000519
  22. GRB000508B, optical photometry
  23. GRB000508B, BVR field photometry
  24. Possible GRB-related phenomenon
  25. RXTE/ASM and IPN localization of GRB 000508B
  26. GRB000424, UBVRI field photometry
  27. GRB000418, UBVRI field photometry update
  28. GRB000424, optical observations
  29. GRB 000429, optical observation
  30. GRB 000429, UBVRI field photometry
  31. GRB 000418, UBVRI field photometry
  32. GRB 000418, optical observation
  33. GRB 000418, Optical Observation
  34. GRB000418, near-infrared observations
  35. Correction to IPN error box for GRB000419
  36. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  37. GRB000416 BRJK observations
  38. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  39. GRB 000408, optical observations
  40. GRB 991208, UBVRI field photometry
  41. GRB000408, lotis optical observations
  42. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  43. GRB000301C - Addendum to GCN 623
  44. GRB 000323, optical observations
  45. GRB 000326: Optical Observations
  46. GRB000326, Radio observations
  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: A Precise Redshift Determination
  52. GRB 000301C, Optical Observation
  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 OT candidate optical observations
  59. GRB000301C - Host galaxy not detected in R (?)
  60. Optical observations of GRB000301c
  61. GRB000301C, Radio observations
  62. GRB000301C, Radio observations
  63. GRB000301C, near-infrared observations (JHK' imaging)
  64. GRB 000301c near-IR observations
  65. GRB 000301C, UBVRI field photometry
  66. GRB 000301C: OT confirmed
  67. GRB000301c optical observations
  68. GRB000301C, optical observations
  69. GRB000301C
  70. GRB 000301C : Optical Candidate
  71. GRB000301C: RXTE/ASM and IPN localizations
  72. GRB000226 [IPN Position]
  73. HST Observations of GRB 990712
  74. GRB 000214 near-IR observations
  75. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  76. GRB000210, Radio Observations
  77. GRB 000115, BVRI field photometry
  78. GRB000214: BeppoSAX GRBM and WFC Detection
  79. Optical observations of GRB000210
  80. GRB000210 X-ray afterglow
  81. GRB000214: X-ray afterglow candidate
  82. GRB000214 refined BeppoSAX-WFC position
  83. GRB 000210: BATSE Observations
  84. Optical observations of the Chandra X-ray source for GRB000210
  85. GRB000210, Radio Observations
  86. IPN triangulation of GRB000210
  87. GRB000210: possible afterglow detection with BeppoSAX NFI
  88. GRB000201, Radio Observations
  89. GRB000210: BeppoSAX GRBM and WFC Detection
  90. SAX_WFC_GRB_NOTICE
  91. SAX_WFC_GRB_NOTICE
  92. GRB000201 Optical Observations
  93. GRB 000201: TAROT optical observations
  94. GRB 991208, radio observations
  95. BATSE+IPN location of GRB000131
  96. IPN localization of GRB000131
  97. GRB 000126, optical observations
  98. BATSE Observations of GRB000115
  99. Second RXTE Observation of GRB 000115
  100. GRB991216, UBVRIJHK field photometry

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