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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"

36217 results found.

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

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