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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"

42261 results found.

  1. GRB030227, BVRcIc field photometry
  2. GRB030226, BVRcIc field calibration
  3. GRB 030227 optical afterglow
  4. GRB 030228, optical observations
  5. GRB 030226: Steep Decline
  6. GRB 030227: Confirmed Optical Afterglow (S1-A)
  7. GRB 030226: R band polarimetric observations
  8. GRB 030226: Optical observations
  9. GRB 030227: fading of candidate optical afterglow 'S1-A'
  10. GRB030227:Optical observations
  11. GRB 20030226: Upper limits from recent and historical observations
  12. GRB 030227, possible optical counterpart of XMM-Newton source
  13. GRB030227 - faint tentative OT candidate
  14. GRB 030226, optical observations
  15. XMM-Newton observation of GRB030227
  16. GRB030227: Kiso optical observations
  17. GRB 030227: Kyoto optical observation
  18. GRB 030226, optical light curve
  19. GRB 030226 spectroscopy
  20. GRB030227: refined INTEGRAL position
  21. GRB030227 localized by INTEGRAL
  22. Possible break in the GRB 030226 light curve
  23. GRB 030226 : Predicted light curve
  24. GRB030226: optical observation
  25. GRB 030226: Confirmed decay index
  26. GRB030226: ESI spectroscopy
  27. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  28. GRB 030226 simultaneous optical observations
  29. Two absorption systems in GRB 030226
  30. GRB 030226, optical observations
  31. GRB030226: optical observations and refined redshift
  32. GRB030226: Optical decay index
  33. GRB 030226 Optical Spectra and R,I,z' Imaging
  34. GRB 030226, optical observations
  35. GRB 030226: Optical afterglow
  36. GRB030226: Candidate optical afterglow
  37. GRB 030217: Optical Observations at 4, 5, and 6 Days
  38. GRB: Non-Referencing of GCN Circulars.
  39. GRB030217: optical observations
  40. IPN triangulation of GRB030217 (small error box)
  41. IPN triangulation of GRB030215A and GRB030215B (annuli)
  42. GRB030115, WSRT radio observations - correction to GCN 1864
  43. GRB 030131: marginal optical detection
  44. GRB030115, WSRT radio observations
  45. IPN triangulation of GRB030206 (annulus)
  46. GRB 030204: Optical Observations
  47. GRB030204 field photometry
  48. GRB020819: Kiso R and I band observations
  49. GRB030131: Candidate Optical Afterglow
  50. GRB 030115: Optical Observations
  51. GRB 030204, optical observations
  52. IPN triangulation of GRB030202 (annulus)
  53. GRB 030131, optical observations
  54. GRB030131: Kiso optical limit for corrected position
  55. GRB030131: Optical limits for corrected position
  56. GRB 030131: afterglow candidate
  57. GRB 030115, late-time optical observations
  58. GRB030131: corrected INTEGRAL position
  59. Type Ic SN2003L (SN/GRB?), optical spectrum
  60. GRB030131: Kiso Observations
  61. GRB 020819: Host galaxy at Radio Position
  62. IPN triangulation of GRB030131 - CORRECTION
  63. GRB 020819: afterglow candidate
  64. IPN triangulation of GRB030131
  65. GRB030131: Optical limit
  66. GRB 030131 optical observations
  67. GRB030131: refined position
  68. GRB 030131 optical observations
  69. A long GRB detected by INTEGRAL
  70. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  71. Type Ic SN2003L (SN/GRB?) Radio Observations
  72. GRB030115 submm upper limit
  73. GRB 030115: Further IR observations with IRSF/SIRIUS
  74. Publicizing GRB Discoveries - A Message from NASA HQ
  75. GRB 030115: Radio detection of IR candidate
  76. GRB 030115, simultaneous observations by BOOTES-1
  77. GRB 030115: IR observations with IRSF/SIRIUS
  78. GRB030115: R-band counterpart of IR candidate
  79. GRB030115, afterglow candidate
  80. GRB 021211: R-band observations at late-time
  81. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  82. IPN triangulation of GRB030115B (small error box)
  83. GRB 030115 : Possible IR counterpart
  84. GRB 030115: Radio Observations
  85. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  86. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  87. Distribution of INTEGRAL SPI-ACS triggers
  88. GRB030115: R-band observations at Asiago
  89. GRB030115: TAROT optical observations
  90. GRB 021211: VLT spectrum
  91. GRB 030115: APO Optical Observations
  92. GRB 030115, no optical candidate
  93. GRB 030115, optical observations
  94. GRB 030115, optical candidate
  95. Information about where HETE will be pointing
  96. IPN triangulation of GRB030109 (annulus)
  97. IPN triangulation of GRB030105 (large error box)
  98. Coronas-F -Wind triangulation of GRB030102
  99. VLT spectroscopy of the probable host of GRB 021211
  100. GRB 021211: Probable Host and Underlying Supernova

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