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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"

45674 results found.

  1. GRB030329:optical observations by MASTER
  2. GRB 030329: optical observations
  3. GRB 030329, R-band observations
  4. GRB 030329: OT B and R photometry, decline rate
  5. GRB030329: Upper limits from recent and historical observations.
  6. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  7. RXTE detection of GRB 030329 afterglow
  8. GRB 030329: Optical Afterglow Observations
  9. GRB 030329: precise position from Kyoto images
  10. GRB 030328 Optical Observations
  11. GRB030328: Decay index
  12. GRB 030328: Optical observations
  13. GRB 030328: optical observations
  14. GRB 030329: Optical afterglow fading
  15. GRB 030329 follow-up
  16. GRB 030329: Optical afterglow candidate
  17. GRB 030329: OT candidate
  18. GRB 030329: Optical afterglow candidate
  19. GRB 030328: OT photometry
  20. GRB030328: optical spectroscopy at TNG
  21. GRB030328: optical photometry at the TNG
  22. VLT spectra of GRB 030328
  23. GRB 030328, optical spectroscopy
  24. GRB 030328, optical observations
  25. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  26. GRB 030328: Optical observations
  27. GRB 030328: Optical afterglow candidate
  28. GRB030323 optical observations
  29. GRB030324 optical observation
  30. GRB030131, BVRcIc field photometry
  31. Possible GRB030323 localized by INTEGRAL
  32. IPN triangulation of GRB030325 (final analysis)
  33. GRB030323: Detection on 2003/03/24
  34. IPN triangulation of GRB030326 (single small error box)
  35. GRB 030323: SARA Optical Observations
  36. IPN triangulation of GRB030325 (single small error box)
  37. GRB030324, optical observations
  38. GRB030324, optical observations
  39. IPN triangulation of GRB030325 (two small error boxes)
  40. GRB 030324: TAROT optical observations
  41. GRB030323: V, R, I photometry
  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. GRB030226, addendum to GCN 1892
  62. IPN upper limit to a GRB associated with SN2003L
  63. IPN triangulation of GRB030317 (annulus)
  64. IPN triangulation of GRB030307 (annulus)
  65. GRB 030227: Optical limit at RIKEN
  66. GRB 030226 Optical observations
  67. IPN triangulation of GRB030306 (single small error box - REVISED)
  68. GRB030226: Optical observations at Asiago
  69. IPN triangulation of GRB030306 (single small error box)
  70. IPN triangulation of GRB030306 (two small error boxes)
  71. IPN triangulation of GRB030306 (intense; annulus only so far)
  72. GRB 030226: Optical observations
  73. GRB030226: Analysis of Chandra data
  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. 030302: NOT A GRB
  87. 030228: NOT A GRB
  88. GRB 030228, optical observations
  89. GRB 030226: Steep Decline
  90. GRB 030227: Confirmed Optical Afterglow (S1-A)
  91. GRB 030226: R band polarimetric observations
  92. GRB 030226: Optical observations
  93. GRB 030227: fading of candidate optical afterglow 'S1-A'
  94. GRB030227:Optical observations
  95. GRB 20030226: Upper limits from recent and historical observations
  96. GRB 030227, possible optical counterpart of XMM-Newton source
  97. GRB030227 - faint tentative OT candidate
  98. GRB 030226, optical observations
  99. XMM-Newton observation of GRB030227
  100. GRB030227: Kiso optical observations

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