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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"

42855 results found.

  1. GRB 030328, optical spectroscopy
  2. GRB 030328, optical observations
  3. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  4. GRB 030328: Optical observations
  5. GRB 030328: Finding chart
  6. GRB 030328: Optical afterglow candidate
  7. GRB030323 optical observations
  8. GRB030324 optical observation
  9. GRB030131, BVRcIc field photometry
  10. Possible GRB030323 localized by INTEGRAL
  11. IPN triangulation of GRB030325 (final analysis)
  12. GRB030323: Detection on 2003/03/24
  13. IPN triangulation of GRB030326 (single small error box)
  14. GRB 030323: SARA Optical Observations
  15. IPN triangulation of GRB030325 (single small error box)
  16. GRB030324, optical observations
  17. GRB030324, optical observations
  18. IPN triangulation of GRB030325 (two small error boxes)
  19. GRB 030324: TAROT optical observations
  20. GRB030323: V, R, I photometry
  21. GRB 030324 (HETE #2641): Optical observations
  22. GRB030324, Optical Observations
  23. GRB030323: Upper limits from recent and historical observations.
  24. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  25. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  26. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  27. VLT/FORS2 spectra of GRB 030323
  28. GRB030323, ROTSE-III detection of possible optical counterpart
  29. GRB030323, optical observations
  30. GRB030324, BVRcIc field photometry
  31. GRB030323, possible optical counterpart
  32. GRB030323, BVRcIc field calibration
  33. GRB 030324 optical observations
  34. GRB 030320: Optical Observations
  35. GRB 030324, optical observations
  36. IPN triangulation of GRB030320B (annulus)
  37. IPN triangulation of GRB030320 (small error box)
  38. IPN triangulation of GRB030320
  39. Possible GRB 030320 localized by INTEGRAL
  40. GRB030226, addendum to GCN 1892
  41. IPN upper limit to a GRB associated with SN2003L
  42. IPN triangulation of GRB030317 (annulus)
  43. IPN triangulation of GRB030307 (annulus)
  44. GRB 030227: Optical limit at RIKEN
  45. GRB 030226 Optical observations
  46. IPN triangulation of GRB030306 (single small error box - REVISED)
  47. GRB030226: Optical observations at Asiago
  48. IPN triangulation of GRB030306 (single small error box)
  49. IPN triangulation of GRB030306 (two small error boxes)
  50. IPN triangulation of GRB030306 (intense; annulus only so far)
  51. GRB 030226: Optical observations
  52. GRB030226: Analysis of Chandra data
  53. IPN triangulation of GRB030304 (annulus)
  54. GRB 030227: Optical observations
  55. GRB030226, BVRc observations
  56. Chandra detection of the X-ray afterglow of GRB 030226
  57. GRB 030226, further optical/NIR imaging
  58. GRB 030226: Ic Observations
  59. GRB030227: Kiso optical upper limit
  60. IPN triangulation of GRB030301 (annulus)
  61. IPN triangulation of GRB030228 (annulus)
  62. GRB030227, BVRcIc field photometry
  63. GRB030226, BVRcIc field calibration
  64. GRB 030227 optical afterglow
  65. 030302: NOT A GRB
  66. 030228: NOT A GRB
  67. GRB 030228, optical observations
  68. GRB 030226: Steep Decline
  69. GRB 030227: Confirmed Optical Afterglow (S1-A)
  70. GRB 030226: R band polarimetric observations
  71. GRB 030226: Optical observations
  72. GRB 030227: fading of candidate optical afterglow 'S1-A'
  73. GRB030227:Optical observations
  74. GRB 20030226: Upper limits from recent and historical observations
  75. GRB 030227, possible optical counterpart of XMM-Newton source
  76. GRB030227 - faint tentative OT candidate
  77. GRB 030226, optical observations
  78. XMM-Newton observation of GRB030227
  79. GRB 030227: Kyoto optical observation
  80. GRB 030226, optical light curve
  81. GRB 030226 spectroscopy
  82. GRB030227: refined INTEGRAL position
  83. GRB030227 localized by INTEGRAL
  84. Possible break in the GRB 030226 light curve
  85. GRB 030226 : Predicted light curve
  86. GRB030226: optical observation
  87. IPN triangulation of GRB030225 (annulus)
  88. GRB 030226: Confirmed decay index
  89. GRB030226: ESI spectroscopy
  90. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  91. GRB 030226 simultaneous optical observations
  92. Two absorption systems in GRB 030226
  93. GRB 030226, optical observations
  94. GRB030226: optical observations and refined redshift
  95. GRB030226: Optical decay index
  96. GRB 030226 Optical Spectra and R,I,z' Imaging
  97. GRB 030226: Optical afterglow
  98. GRB030226: Candidate optical afterglow
  99. GRB 030217: Optical Observations at 4, 5, and 6 Days
  100. IPN triangulation of GRB030223 (annulus)

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