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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"

36215 results found.

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

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