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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"

39265 results found.

  1. INTEGRAL GRB 030331
  2. GRB 030324: Optical and NIR Observations
  3. GRB 030328, optical photometry
  4. GRB030329: R band light curve by MASTER
  5. GRB030329 - Light curve flattening
  6. GRB 030329: SARA Optical Observations
  7. GRB 030324, optical search
  8. GRB030329 - near contemporaneous optical limits from CONCAM
  9. GRB 030329, optical observations
  10. GRB 030329: Light curve observed during the change of its slope.
  11. GRB030329, BVRcIc field photometry
  12. GRB030329, SPM optical observations
  13. GRB 030329: Optical Decay
  14. Redshift of GRB 030329
  15. GRB030329: ROTSE network observes steepening of decay curve
  16. GRB 030329, optical photometry
  17. GRB 030329: Optical decay and synthesis
  18. GRB030329 optical observations
  19. GRB 030329: Radio Observations
  20. GRB 030329, optical spectroscopy
  21. GRB 030329: still bright
  22. GRB 030329: Optical pre-Imaging
  23. GRB 030329: visual observations
  24. GRB 030329: Upper limit from 5.6 hours before trigger
  25. GRB030328: R optical observation
  26. GRB 030323: Gemini South VRI obsevations.
  27. GRB030329: Optical observations
  28. GRB 030329, R-band observations, supplement
  29. GRB030329:optical observations by MASTER
  30. GRB 030329: optical observations
  31. GRB 030329, R-band observations
  32. GRB 030329: OT B and R photometry, decline rate
  33. GRB030329: Upper limits from recent and historical observations.
  34. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  35. RXTE detection of GRB 030329 afterglow
  36. GRB 030329: Optical Afterglow Observations
  37. GRB 030329: precise position from Kyoto images
  38. GRB 030328 Optical Observations
  39. GRB 030328: Optical observations
  40. GRB 030328: optical observations
  41. GRB 030329: Optical afterglow fading
  42. GRB 030329 follow-up
  43. GRB 030329: Optical afterglow candidate
  44. GRB 030329: OT candidate
  45. GRB 030329: Optical afterglow candidate
  46. GRB 030328: OT photometry
  47. VLT spectra of GRB 030328
  48. GRB 030328, optical spectroscopy
  49. GRB 030328, optical observations
  50. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  51. GRB 030328: Optical observations
  52. Re: GRB 030328: Finding chart
  53. GRB 030328: Finding chart
  54. GRB 030328: Optical afterglow candidate
  55. GRB030131, BVRcIc field photometry
  56. Possible GRB030323 localized by INTEGRAL
  57. IPN triangulation of GRB030325 (final analysis)
  58. IPN triangulation of GRB030326 (single small error box)
  59. GRB 030323: SARA Optical Observations
  60. IPN triangulation of GRB030325 (single small error box)
  61. GRB030324, optical observations
  62. IPN triangulation of GRB030325 (two small error boxes)
  63. GRB 030324: TAROT optical observations
  64. GRB030323: V, R, I photometry
  65. GRB 030324 (HETE #2641): Optical observations
  66. GRB030324, Optical Observations
  67. GRB030323: Upper limits from recent and historical observations.
  68. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  69. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  70. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  71. VLT/FORS2 spectra of GRB 030323
  72. GRB030323, ROTSE-III detection of possible optical counterpart
  73. GRB030323, optical observations
  74. GRB030324, BVRcIc field photometry
  75. GRB030323, possible optical counterpart
  76. GRB030323, BVRcIc field calibration
  77. GRB 030324 optical observations
  78. GRB 030320: Optical Observations
  79. GRB 030324, optical observations
  80. IPN triangulation of GRB030320B (annulus)
  81. IPN triangulation of GRB030320 (small error box)
  82. IPN triangulation of GRB030320
  83. Possible GRB 030320 localized by INTEGRAL
  84. IPN upper limit to a GRB associated with SN2003L
  85. IPN triangulation of GRB030317 (annulus)
  86. IPN triangulation of GRB030307 (annulus)
  87. GRB 030227: Optical limit at RIKEN
  88. GRB 030226 Optical observations
  89. IPN triangulation of GRB030306 (single small error box - REVISED)
  90. GRB030226: Optical observations at Asiago
  91. IPN triangulation of GRB030306 (single small error box)
  92. IPN triangulation of GRB030306 (two small error boxes)
  93. IPN triangulation of GRB030306 (intense; annulus only so far)
  94. GRB 030226: Optical observations
  95. IPN triangulation of GRB030304 (annulus)
  96. GRB 030227: Optical observations
  97. GRB030226, BVRc observations
  98. Chandra detection of the X-ray afterglow of GRB 030226
  99. GRB 030226, further optical/NIR imaging
  100. GRB030227, optical observations

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