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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"

36115 results found.

  1. GRB 030329: visual observations
  2. GRB 030329: Upper limit from 5.6 hours before trigger
  3. GRB030328: R optical observation
  4. GRB 030323: Gemini South VRI obsevations.
  5. GRB030329: Optical observations
  6. GRB 030329, R-band observations, supplement
  7. GRB030329:optical observations by MASTER
  8. GRB 030329: optical observations
  9. GRB 030329, R-band observations
  10. GRB 030329: OT B and R photometry, decline rate
  11. GRB030329: Upper limits from recent and historical observations.
  12. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  13. RXTE detection of GRB 030329 afterglow
  14. GRB 030329: Optical Afterglow Observations
  15. GRB 030329: precise position from Kyoto images
  16. GRB 030328 Optical Observations
  17. GRB 030328: Optical observations
  18. GRB 030328: optical observations
  19. GRB 030329: Optical afterglow fading
  20. GRB 030329 follow-up
  21. GRB 030329: Optical afterglow candidate
  22. GRB 030329: OT candidate
  23. GRB 030329: Optical afterglow candidate
  24. GRB 030328: OT photometry
  25. VLT spectra of GRB 030328
  26. GRB 030328, optical spectroscopy
  27. GRB 030328, optical observations
  28. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  29. GRB 030328: Optical observations
  30. Re: GRB 030328: Finding chart
  31. GRB 030328: Finding chart
  32. GRB 030328: Optical afterglow candidate
  33. GRB030131, BVRcIc field photometry
  34. Possible GRB030323 localized by INTEGRAL
  35. IPN triangulation of GRB030325 (final analysis)
  36. IPN triangulation of GRB030326 (single small error box)
  37. GRB 030323: SARA Optical Observations
  38. IPN triangulation of GRB030325 (single small error box)
  39. GRB030324, optical observations
  40. IPN triangulation of GRB030325 (two small error boxes)
  41. GRB 030324: TAROT optical observations
  42. GRB 030324 (HETE #2641): Optical observations
  43. GRB030324, Optical Observations
  44. GRB030323: Upper limits from recent and historical observations.
  45. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  46. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  47. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  48. VLT/FORS2 spectra of GRB 030323
  49. GRB030323, ROTSE-III detection of possible optical counterpart
  50. GRB030323, optical observations
  51. GRB030324, BVRcIc field photometry
  52. GRB030323, possible optical counterpart
  53. GRB030323, BVRcIc field calibration
  54. GRB 030324 optical observations
  55. GRB 030320: Optical Observations
  56. GRB 030324, optical observations
  57. IPN triangulation of GRB030320B (annulus)
  58. IPN triangulation of GRB030320 (small error box)
  59. IPN triangulation of GRB030320
  60. Possible GRB 030320 localized by INTEGRAL
  61. IPN upper limit to a GRB associated with SN2003L
  62. IPN triangulation of GRB030317 (annulus)
  63. IPN triangulation of GRB030307 (annulus)
  64. GRB 030227: Optical limit at RIKEN
  65. GRB 030226 Optical observations
  66. IPN triangulation of GRB030306 (single small error box - REVISED)
  67. GRB030226: Optical observations at Asiago
  68. IPN triangulation of GRB030306 (single small error box)
  69. IPN triangulation of GRB030306 (two small error boxes)
  70. IPN triangulation of GRB030306 (intense; annulus only so far)
  71. GRB 030226: Optical observations
  72. IPN triangulation of GRB030304 (annulus)
  73. GRB 030227: Optical observations
  74. GRB030226, BVRc observations
  75. Chandra detection of the X-ray afterglow of GRB 030226
  76. GRB 030226, further optical/NIR imaging
  77. GRB030227, optical observations
  78. GRB 030226: Ic Observations
  79. GRB030227: Kiso optical upper limit
  80. IPN triangulation of GRB030301 (annulus)
  81. IPN triangulation of GRB030228 (annulus)
  82. GRB030227, BVRcIc field photometry
  83. GRB030226, BVRcIc field calibration
  84. GRB 030227 optical afterglow
  85. 030302: NOT A GRB
  86. 030228: NOT A GRB
  87. GRB 030228, optical observations
  88. GRB 030226: Steep Decline
  89. GRB 030227: Confirmed Optical Afterglow (S1-A)
  90. GRB 030226: R band polarimetric observations
  91. GRB 030226: Optical observations
  92. GRB 030227: fading of candidate optical afterglow 'S1-A'
  93. GRB030227:Optical observations
  94. GRB 20030226: Upper limits from recent and historical observations
  95. GRB 030227, possible optical counterpart of XMM-Newton source
  96. GRB030227 - faint tentative OT candidate
  97. GRB 030226, optical observations
  98. GRB030227: Kiso optical observations
  99. GRB 030227: Kyoto optical observation
  100. GRB 030226, optical light curve

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