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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"

32685 results found.

  1. GRB 20030226: Upper limits from recent and historical observations
  2. GRB 030227, possible optical counterpart of XMM-Newton source
  3. GRB030227 - faint tentative OT candidate
  4. GRB 030226, optical observations
  5. XMM-Newton observation of GRB030227
  6. GRB 030227: Kyoto optical observation
  7. GRB 030226, optical light curve
  8. GRB 030226 spectroscopy
  9. Possible break in the GRB 030226 light curve
  10. GRB030226: optical observation
  11. GRB 030226: Confirmed decay index
  12. GRB030226: ESI spectroscopy
  13. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  14. Two absorption systems in GRB 030226
  15. GRB 030226, optical observations
  16. GRB030226: optical observations and refined redshift
  17. GRB 030226, optical observations
  18. GRB 030226: Optical afterglow
  19. GRB 030217: Optical Observations at 4, 5, and 6 Days
  20. GRB: Non-Referencing of GCN Circulars.
  21. GRB030217: optical observations
  22. IPN triangulation of GRB030217 (small error box)
  23. GRB030115, WSRT radio observations - correction to GCN 1864
  24. GRB 030131: marginal optical detection
  25. GCN/INTEGRAL Mistake Fixed
  26. GRB 030204: Optical Observations
  27. GRB030204 field photometry
  28. GRB020819: Kiso R and I band observations
  29. GRB 030204: Correction to GCN 1856
  30. GRB030131: Candidate Optical Afterglow
  31. GRB 030115: Optical Observations
  32. GRB 030204, optical observations
  33. GRB 030131, optical observations
  34. GRB030131: Kiso optical limit for corrected position
  35. GRB030131: Optical limits for corrected position
  36. GRB 030131: afterglow candidate
  37. GRB 030115, late-time optical observations
  38. Type Ic SN2003L (SN/GRB?), optical spectrum
  39. GRB 020819: Host galaxy at Radio Position
  40. IPN triangulation of GRB030131 - CORRECTION
  41. IPN triangulation of GRB030131
  42. GRB030131: Optical limit
  43. GRB 030131 optical observations
  44. GRB030131: refined position
  45. GRB 030131 optical observations
  46. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  47. GRB030115 submm upper limit
  48. GRB 030115: Further IR observations with IRSF/SIRIUS
  49. Publicizing GRB Discoveries - A Message from NASA HQ
  50. GRB 030115, simultaneous observations by BOOTES-1
  51. GRB 030115: IR observations with IRSF/SIRIUS
  52. GRB030115: R-band counterpart of IR candidate
  53. GRB030115, afterglow candidate
  54. GRB 021211: R-band observations at late-time
  55. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  56. IPN triangulation of GRB030115B (small error box)
  57. GRB 030115 : Possible IR counterpart
  58. GRB 030115: Radio Observations
  59. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  60. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  61. ANNOUNCEMENT ON INTEGRAL GRB ALERTS
  62. Distribution of INTEGRAL SPI-ACS triggers
  63. GRB030115: TAROT optical observations
  64. GRB 021211: VLT spectrum
  65. GRB 030115: APO Optical Observations
  66. GRB 030115, no optical candidate
  67. GRB 030115, optical observations
  68. GRB 030115, optical candidate
  69. IPN triangulation of GRB030109 (annulus)
  70. IPN triangulation of GRB030105 (large error box)
  71. IPN triangulation of GRB030102B (refined localization - portion of annulus)
  72. Coronas-F -Wind triangulation of GRB030102
  73. IPN triangulation of GRB030102 (annulus)
  74. VLT spectroscopy of the probable host of GRB 021211
  75. GRB021226
  76. GRB 021211: Probable Host and Underlying Supernova
  77. GRB 021226 registration by Helicon/Coronas-F
  78. GRB 021112: Evidence for Another Dark Optical Afterglow
  79. GRB 021219: OSN optical observations
  80. GRB021219: Radio Observations
  81. GRB021219, optical observations
  82. IPN triangulation of GRB021219 - CORRECTION
  83. IPN triangulation of GRB021219
  84. GRB021219, optical observation by MASTER
  85. GRB021219: Correction to GCN 1766
  86. VLT spectra of GRB 021211 revisited
  87. GRB021219: a long GRB localized by INTEGRAL
  88. GRB021211: APO optical observations
  89. IPN detection of continued activity from SGR1806-20
  90. XRF 020903 : HST observations
  91. GRB 021201: Optical Observations
  92. GRB 021211, optical observations
  93. GRB 021211: CTIO observations
  94. GRB021211: Measurement of Early Time Afterglow
  95. VLT spectrum of GRB 021211
  96. GRB 021211: early break in light curve
  97. GRB021211, BVRI field photometry
  98. GRB021211: Optical observations in CrAO
  99. GRB 021211, IR observations
  100. GRB 021211, optical observations

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