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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"

17798 results found.

  1. IPN triangulation of GRB000830
  2. IPN localization of GRB000812
  3. GRB000801, VLT-Antu R-band observations
  4. GRB 991208 Host Galaxy Imaging
  5. Updated IPN coordinates for GRB000801
  6. IPN localization of GRB000801
  7. GRB 990510: Possible detection of a host galaxy
  8. GRB 990510 Host Galaxy Discovery
  9. GRB 990712: Late time HST/STIS Observations
  10. GRB 991216, HST/STIS observations
  11. GRB000630, optical observations
  12. GRB000630, Revised BVRI Field Photometry
  13. GRB000630, Optical Observations
  14. GRB000630, optical observations
  15. GRB000630, optical observations
  16. GRB000630, BVRI Field Photometry
  17. GRB000630, optical observations
  18. GRB000630: Optical observations
  19. possible optical counterpart of GRB 000630
  20. GRB 000620, optical observations
  21. GRB000418, HST/STIS Observations
  22. GRB990123: Late-time HST/STIS observations of the host
  23. GRB000620, optical observations
  24. GRB000620 - Optical observations
  25. GRB000620 Optical observations
  26. GRB000620: BeppoSAX WFC and GRBM detection
  27. GRB000607, optical observations
  28. GRB 000615: NIR further observations
  29. GRB000616 optical observations
  30. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  31. GRB000615, further R-band photometry
  32. GRB 000615: NIR observations
  33. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  34. GRB000615, R-band photometry
  35. GRB 000301C: Further Late-Time HST/STIS observations
  36. GRB000528: follow-up X-ray measurements and update of IPN annulus
  37. BeppoSAX X-ray transient/possible GRB000608
  38. GRB000604 - Optical observations
  39. GRB000604, optical observations
  40. GRB000528, optical observations at ESO
  41. GRB 000418: Detection of the Host Galaxy
  42. GRB000604, optical observations, comparison with DPOSS
  43. GRB000528, Radio Observations
  44. X-ray Afterglow of GRB 000529
  45. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  46. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  47. GRB 000528 - WFC measurements
  48. GRB000519, BVRI field photometry
  49. GRB000508B, optical photometry
  50. GRB000508B, BVR field photometry
  51. Possible GRB-related phenomenon
  52. RXTE/ASM and IPN localization of GRB 000508B
  53. GRB000424, UBVRI field photometry
  54. GRB000418, UBVRI field photometry update
  55. GRB000424, optical observations
  56. GRB 000429, optical observation
  57. GRB 000429, UBVRI field photometry
  58. GRB 000418, UBVRI field photometry
  59. GRB 000418, optical observation
  60. GRB 000418, Optical Observation
  61. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  62. GRB 000408, optical observations
  63. Refined IPN error box for GRB000408
  64. GRB 991208, UBVRI field photometry
  65. GRB000408: Optical CCD Observations from MIRO
  66. GRB000408, lotis optical observations
  67. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  68. GRB000408 [IPN Position]
  69. GRB000301C - Addendum to GCN 623
  70. GRB 000326: Optical Observations
  71. GRB000326, Radio observations
  72. GRB000313, Radio observations
  73. GRB 000313 - optical transient in the BATSE error box
  74. GRB 000307, BVRI Field Photometry
  75. GRB 000301C: HST/STIS CCD Imaging of the field
  76. GRB 000301C Optical Observations
  77. GRB 000301C: K' Observations
  78. GRB000301C - Host galaxy not detected in R (?)
  79. Optical observations of GRB000301c
  80. GRB000301C, Radio observations
  81. GRB000301C, Radio observations
  82. GRB 000301c near-IR observations
  83. GRB 000301C, UBVRI field photometry
  84. GRB 000301C: OT confirmed
  85. GRB000301c optical observations
  86. GRB000301C
  87. GRB 000301C : Optical Candidate
  88. HST Observations of GRB 990712
  89. GRB 000214 near-IR observations
  90. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  91. GRB000210, Radio Observations
  92. GRB 000115, BVRI field photometry
  93. GRB000214: BeppoSAX GRBM and WFC Detection
  94. Optical observations of GRB000210
  95. GRB000210 X-ray afterglow
  96. GRB000214: X-ray afterglow candidate
  97. GRB000214 refined BeppoSAX-WFC position
  98. Optical observations of the Chandra X-ray source for GRB000210
  99. GRB000210, Radio Observations
  100. GRB000201, Radio Observations

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