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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

36105 results found.

  1. GRB030329: Upper limits from recent and historical observations.
  2. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  3. RXTE detection of GRB 030329 afterglow
  4. GRB 030329: Optical Afterglow Observations
  5. GRB 030329: precise position from Kyoto images
  6. GRB 030328 Optical Observations
  7. GRB 030328: Optical observations
  8. GRB 030328: optical observations
  9. GRB 030329: Optical afterglow fading
  10. GRB 030329 follow-up
  11. GRB 030329: Optical afterglow candidate
  12. GRB 030329: OT candidate
  13. GRB 030329: Optical afterglow candidate
  14. GRB 030328: OT photometry
  15. VLT spectra of GRB 030328
  16. GRB 030328, optical spectroscopy
  17. GRB 030328, optical observations
  18. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  19. GRB 030328: Optical observations
  20. Re: GRB 030328: Finding chart
  21. GRB 030328: Finding chart
  22. GRB 030328: Optical afterglow candidate
  23. GRB030131, BVRcIc field photometry
  24. Possible GRB030323 localized by INTEGRAL
  25. IPN triangulation of GRB030325 (final analysis)
  26. IPN triangulation of GRB030326 (single small error box)
  27. GRB 030323: SARA Optical Observations
  28. IPN triangulation of GRB030325 (single small error box)
  29. GRB030324, optical observations
  30. IPN triangulation of GRB030325 (two small error boxes)
  31. GRB 030324: TAROT optical observations
  32. GRB 030324 (HETE #2641): Optical observations
  33. GRB030324, Optical Observations
  34. GRB030323: Upper limits from recent and historical observations.
  35. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  36. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  37. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  38. VLT/FORS2 spectra of GRB 030323
  39. GRB030323, ROTSE-III detection of possible optical counterpart
  40. GRB030323, optical observations
  41. GRB030324, BVRcIc field photometry
  42. GRB030323, possible optical counterpart
  43. GRB030323, BVRcIc field calibration
  44. GRB 030324 optical observations
  45. GRB 030320: Optical Observations
  46. GRB 030324, optical observations
  47. IPN triangulation of GRB030320B (annulus)
  48. IPN triangulation of GRB030320 (small error box)
  49. IPN triangulation of GRB030320
  50. Possible GRB 030320 localized by INTEGRAL
  51. IPN upper limit to a GRB associated with SN2003L
  52. IPN triangulation of GRB030317 (annulus)
  53. IPN triangulation of GRB030307 (annulus)
  54. GRB 030227: Optical limit at RIKEN
  55. GRB 030226 Optical observations
  56. IPN triangulation of GRB030306 (single small error box - REVISED)
  57. GRB030226: Optical observations at Asiago
  58. IPN triangulation of GRB030306 (single small error box)
  59. IPN triangulation of GRB030306 (two small error boxes)
  60. IPN triangulation of GRB030306 (intense; annulus only so far)
  61. GRB 030226: Optical observations
  62. IPN triangulation of GRB030304 (annulus)
  63. GRB 030227: Optical observations
  64. GRB030226, BVRc observations
  65. Chandra detection of the X-ray afterglow of GRB 030226
  66. GRB 030226, further optical/NIR imaging
  67. GRB030227, optical observations
  68. GRB 030226: Ic Observations
  69. GRB030227: Kiso optical upper limit
  70. IPN triangulation of GRB030301 (annulus)
  71. IPN triangulation of GRB030228 (annulus)
  72. GRB030227, BVRcIc field photometry
  73. GRB030226, BVRcIc field calibration
  74. GRB 030227 optical afterglow
  75. 030302: NOT A GRB
  76. 030228: NOT A GRB
  77. GRB 030228, optical observations
  78. GRB 030226: Steep Decline
  79. GRB 030227: Confirmed Optical Afterglow (S1-A)
  80. GRB 030226: R band polarimetric observations
  81. GRB 030226: Optical observations
  82. GRB 030227: fading of candidate optical afterglow 'S1-A'
  83. GRB030227:Optical observations
  84. GRB 20030226: Upper limits from recent and historical observations
  85. GRB 030227, possible optical counterpart of XMM-Newton source
  86. GRB030227 - faint tentative OT candidate
  87. GRB 030226, optical observations
  88. GRB030227: Kiso optical observations
  89. GRB 030227: Kyoto optical observation
  90. GRB 030226, optical light curve
  91. GRB 030226 spectroscopy
  92. Possible break in the GRB 030226 light curve
  93. GRB 030226 : Predicted light curve
  94. IPN triangulation of GRB030225 (annulus)
  95. GRB 030226: Confirmed decay index
  96. GRB030226: ESI spectroscopy
  97. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  98. GRB 030226 simultaneous optical observations
  99. Two absorption systems in GRB 030226
  100. GRB 030226, optical observations

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