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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"

36190 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. Re: GRB 030328: Finding chart
  6. GRB 030328: Finding chart
  7. GRB 030328: Optical afterglow candidate
  8. GRB030131, BVRcIc field photometry
  9. Possible GRB030323 localized by INTEGRAL
  10. IPN triangulation of GRB030325 (final analysis)
  11. IPN triangulation of GRB030326 (single small error box)
  12. GRB 030323: SARA Optical Observations
  13. IPN triangulation of GRB030325 (single small error box)
  14. GRB030324, optical observations
  15. IPN triangulation of GRB030325 (two small error boxes)
  16. GRB 030324: TAROT optical observations
  17. GRB 030324 (HETE #2641): Optical observations
  18. GRB030324, Optical Observations
  19. GRB030323: Upper limits from recent and historical observations.
  20. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  21. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  22. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  23. VLT/FORS2 spectra of GRB 030323
  24. GRB030323, ROTSE-III detection of possible optical counterpart
  25. GRB030323, optical observations
  26. GRB030324, BVRcIc field photometry
  27. GRB030323, possible optical counterpart
  28. GRB030323, BVRcIc field calibration
  29. GRB 030324 optical observations
  30. GRB 030320: Optical Observations
  31. GRB 030324, optical observations
  32. IPN triangulation of GRB030320B (annulus)
  33. IPN triangulation of GRB030320 (small error box)
  34. IPN triangulation of GRB030320
  35. Possible GRB 030320 localized by INTEGRAL
  36. IPN upper limit to a GRB associated with SN2003L
  37. IPN triangulation of GRB030317 (annulus)
  38. IPN triangulation of GRB030307 (annulus)
  39. GRB 030227: Optical limit at RIKEN
  40. GRB 030226 Optical observations
  41. IPN triangulation of GRB030306 (single small error box - REVISED)
  42. GRB030226: Optical observations at Asiago
  43. IPN triangulation of GRB030306 (single small error box)
  44. IPN triangulation of GRB030306 (two small error boxes)
  45. IPN triangulation of GRB030306 (intense; annulus only so far)
  46. GRB 030226: Optical observations
  47. IPN triangulation of GRB030304 (annulus)
  48. GRB 030227: Optical observations
  49. GRB030226, BVRc observations
  50. Chandra detection of the X-ray afterglow of GRB 030226
  51. GRB 030226, further optical/NIR imaging
  52. GRB030227, optical observations
  53. GRB 030226: Ic Observations
  54. GRB030227: Kiso optical upper limit
  55. IPN triangulation of GRB030301 (annulus)
  56. IPN triangulation of GRB030228 (annulus)
  57. GRB030227, BVRcIc field photometry
  58. GRB030226, BVRcIc field calibration
  59. GRB 030227 optical afterglow
  60. 030302: NOT A GRB
  61. 030228: NOT A GRB
  62. GRB 030228, optical observations
  63. GRB 030226: Steep Decline
  64. GRB 030227: Confirmed Optical Afterglow (S1-A)
  65. GRB 030226: R band polarimetric observations
  66. GRB 030226: Optical observations
  67. GRB 030227: fading of candidate optical afterglow 'S1-A'
  68. GRB030227:Optical observations
  69. GRB 20030226: Upper limits from recent and historical observations
  70. GRB 030227, possible optical counterpart of XMM-Newton source
  71. GRB030227 - faint tentative OT candidate
  72. GRB 030226, optical observations
  73. GRB030227: Kiso optical observations
  74. GRB 030227: Kyoto optical observation
  75. GRB 030226, optical light curve
  76. GRB 030226 spectroscopy
  77. Possible break in the GRB 030226 light curve
  78. GRB 030226 : Predicted light curve
  79. IPN triangulation of GRB030225 (annulus)
  80. GRB 030226: Confirmed decay index
  81. GRB030226: ESI spectroscopy
  82. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  83. GRB 030226 simultaneous optical observations
  84. Two absorption systems in GRB 030226
  85. GRB 030226, optical observations
  86. GRB 030226 Optical Spectra and R,I,z' Imaging
  87. GRB 030226, optical observations
  88. GRB 030226: Optical afterglow
  89. GRB 030217: Optical Observations at 4, 5, and 6 Days
  90. IPN triangulation of GRB030223 (annulus)
  91. IPN triangulation of GRB030220 (annulus)
  92. GRB: Non-Referencing of GCN Circulars.
  93. IPN triangulation of GRB030218 (annulus)
  94. IPN triangulation of GRB030217 (small error box)
  95. IPN triangulation of GRB030215C (annulus)
  96. IPN triangulation of GRB030217 (annulus)
  97. IPN triangulation of GRB030216 (annulus)
  98. IPN triangulation of GRB030215A and GRB030215B (annuli)
  99. GRB030115, WSRT radio observations - correction to GCN 1864
  100. GRB 030131: marginal optical detection

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