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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"

32495 results found.

  1. GRB 030329, R-band light curve
  2. GRB 030329: further optical observations
  3. GRB030329 - OT brightens
  4. GRB 030329: OT observations at Kanazawa
  5. GRB030329 15 GHz radio observation
  6. GRB 030329 RBO V Optical Observations
  7. GRB 030329, optical photometry
  8. GRB030329: Near Infrared Observations
  9. GRB 030324: Optical and NIR Observations
  10. GRB 030328, optical photometry
  11. GRB030329: R band light curve by MASTER
  12. GRB030329 - Light curve flattening
  13. GRB 030329: SARA Optical Observations
  14. GRB 030324, optical search
  15. GRB030329 - near contemporaneous optical limits from CONCAM
  16. GRB030329: R and B observations
  17. GRB 030329, optical observations
  18. GRB030329: Optical observations
  19. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  20. GRB030329a: detection by Konus-Wind
  21. GRB 030329: Light curve observed during the change of its slope.
  22. GRB030329, BVRcIc field photometry
  23. GRB030329, SPM optical observations
  24. GRB 030329: Optical Decay
  25. Redshift of GRB 030329
  26. GRB030329: ROTSE network observes steepening of decay curve
  27. GRB 030329, optical photometry
  28. GRB 030329: Optical decay and synthesis
  29. GRB030329 optical observations
  30. GRB030329: optical spectroscopy with the TNG
  31. GRB 030329: Radio Observations
  32. GRB 030329, optical spectroscopy
  33. GRB 030329: still bright
  34. GRB 030329: Optical pre-Imaging
  35. GRB 030329: visual observations
  36. GRB 030329: Upper limit from 5.6 hours before trigger
  37. GRB030328: R optical observation
  38. GRB030328: X-ray Afterglow Observed with Chandra
  39. GRB 030323: Gemini South VRI obsevations.
  40. GRB030329: Optical observations
  41. GRB030329:optical observations by MASTER
  42. GRB 030329: optical observations
  43. GRB 030329, R-band observations
  44. GRB 030329: OT B and R photometry, decline rate
  45. GRB030329: Upper limits from recent and historical observations.
  46. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  47. GRB 030329: Optical Afterglow Observations
  48. GRB 030329: precise position from Kyoto images
  49. GRB 030328 Optical Observations
  50. GRB030328: Decay index
  51. GRB 030328: Optical observations
  52. GRB 030328: optical observations
  53. GRB 030329: Optical afterglow fading
  54. GRB 030328: OT photometry
  55. GRB030328: optical spectroscopy at TNG
  56. GRB030328: optical photometry at the TNG
  57. VLT spectra of GRB 030328
  58. GRB 030328, optical spectroscopy
  59. GRB 030328, optical observations
  60. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  61. GRB 030328: Optical observations
  62. GRB 030328: Finding chart
  63. GRB030323 optical observations
  64. GRB030131, BVRcIc field photometry
  65. IPN triangulation of GRB030325 (final analysis)
  66. GRB030323: Detection on 2003/03/24
  67. GRB 030323: SARA Optical Observations
  68. IPN triangulation of GRB030325 (single small error box)
  69. GRB030324, optical observations
  70. GRB030324, optical observations
  71. GRB 030324: TAROT optical observations
  72. GRB030323: V, R, I photometry
  73. GRB 030324 (HETE #2641): Optical observations
  74. GRB030324, Optical Observations
  75. GRB030323: Upper limits from recent and historical observations.
  76. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  77. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  78. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  79. VLT/FORS2 spectra of GRB 030323
  80. GRB030323, ROTSE-III detection of possible optical counterpart
  81. GRB030323, optical observations
  82. GRB030323, possible optical counterpart
  83. GRB 030324 optical observations
  84. GRB 030320: Optical Observations
  85. IPN triangulation of GRB030320 (small error box)
  86. IPN triangulation of GRB030320
  87. GRB030226, addendum to GCN 1892
  88. IPN upper limit to a GRB associated with SN2003L
  89. GRB 030227: Optical limit at RIKEN
  90. GRB 030226 Optical observations
  91. IPN triangulation of GRB030306 (single small error box - REVISED)
  92. GRB030226: Optical observations at Asiago
  93. IPN triangulation of GRB030306 (two small error boxes)
  94. GRB 030226: Optical observations
  95. GRB030226: Analysis of Chandra data
  96. GRB 030227: Optical observations
  97. GRB030226, BVRc observations
  98. Chandra detection of the X-ray afterglow of GRB 030226
  99. GRB 030226, further optical/NIR imaging
  100. GRB 030226: Ic Observations

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