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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

35449 results found.

  1. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  2. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  3. IPN triangulation of GRB030115B (annulus)
  4. ANNOUNCEMENT ON INTEGRAL GRB ALERTS
  5. Distribution of INTEGRAL SPI-ACS triggers
  6. GRB030115: R-band observations at Asiago
  7. GRB030115: TAROT optical observations
  8. GRB 021211: VLT spectrum
  9. GRB 030115: APO Optical Observations
  10. GRB 030115, no optical candidate
  11. GRB 030115, optical observations
  12. GRB 030115, optical candidate
  13. Possible GRB030113 seen by SPI ACS
  14. Probable GRB030112B seen by SPI ACS
  15. Probable GRB030112 seen by SPI ACS
  16. Possible GRB030111 seen by SPI ACS
  17. Possible GRB030110b seen by SPI ACS
  18. Possible GRB 030110 seen by SPI ACS
  19. IPN triangulation of GRB030109 (annulus)
  20. IPN triangulation of GRB030105 (large error box)
  21. IPN triangulation of GRB030102B (refined localization - portion of annulus)
  22. Possible GRB 20030109 seen by SPI ACS
  23. IPN triangulation of GRB030102B (portion of annulus)
  24. IPN triangulation of GRB030102A (large error box)
  25. Possible GRB20030107 seen by SPI-ACS
  26. Possible GRB 20030105 seen by SPI ACS
  27. IPN triangulation of GRB030102 (annulus)
  28. GRB on 20030102 seen by SPI-ACS
  29. VLT spectroscopy of the probable host of GRB 021211
  30. GRB on 20030101 seen by SPI-ACS
  31. IPN triangulation of GRB030101 (two large error boxes)
  32. GRB021226
  33. GRB 021211: Probable Host and Underlying Supernova
  34. GRB 021226 registration by Helicon/Coronas-F
  35. Probable GRB in INTEGRAL SPI-ACS
  36. IPN triangulation of GRB021223 (two large error boxes)
  37. GRB021211, radio observations
  38. GRB 021112: Evidence for Another Dark Optical Afterglow
  39. GRB 021219: OSN optical observations
  40. GRB021219: Radio Observations
  41. IPN triangulation of GRB021219 - CORRECTION
  42. IPN triangulation of GRB021219
  43. GRB021219, optical observation by MASTER
  44. GRB021219: Correction to GCN 1766
  45. VLT spectra of GRB 021211 revisited
  46. GRB021219: a long GRB localized by INTEGRAL
  47. IPN detection of continued activity from SGR1806-20
  48. IPN triangulation of GRB021215 (large error box)
  49. IPN triangulation of GRB021214 (annulus)
  50. XRF 020903 : HST observations
  51. GRB 021201: Optical Observations
  52. GRB 021211, optical observations
  53. GRB 021211: CTIO observations
  54. GRB021211: Measurement of Early Time Afterglow
  55. VLT spectrum of GRB 021211
  56. IPN triangulation of GRB021211B (two large error boxes)
  57. GRB 021211: early break in light curve
  58. GRB021211, BVRI field photometry
  59. GRB 021211, IR observations
  60. GRB 021211, optical observations
  61. GRB 021211: Optical Observations
  62. GRB021211: Kiso Observations
  63. GRB021204: Kiso Observations
  64. GRB 021201, optical observations
  65. GRB 021211: Radio Observations
  66. GRB 021201 (short/hard), NOT observations
  67. SUB-MM SEARCH FOR GRB 021211
  68. GRB 021211 Milagro GeV/TeV Observations
  69. GRB 021211, R- and I-band observations
  70. GRB021211 - Upper limits from recent and historical observations
  71. GRB 021204: I-band Observations
  72. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  73. HETE 2493: Optical observations
  74. GRB 021204: Optical Observations at RIKEN
  75. GRB 021125: Radio Observations
  76. IPN triangulation of GRB021206 (small error box)
  77. IPN triangulation of GRB021206 (exceptionally bright; annulus only)
  78. IPN detection of renewed activity from SGR1806-20
  79. IPN triangulation of GRB021205 (large error box)
  80. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  81. GRB021201, BVRcIc field photometry
  82. GRB 021201, Radio Observations
  83. GRB 021201: Optical Observations
  84. GRB 021201: BOOTES simultaneous optical observations
  85. IPN triangulation of GRB021201 (short/hard burst, small error box)
  86. Radio Catalog of GRB Afterglows
  87. GRB021004, late time optical observations
  88. GRB021004 Chandra Observation
  89. IPN detection of continued SGR1900+14 activity
  90. IPN triangulation of GRB021115 (annulus)
  91. IPN triangulation of GRB021125B (two large error boxes)
  92. IPN triangulation of GRB021119 (large error box)
  93. IPN triangulation of GRB021125B (annulus)
  94. Improved IPN error box for GRB021125
  95. IPN triangulation of GRB021125 (INTEGRAL BURST)
  96. GRB021125 : A long GRB localized by INTEGRAL
  97. IPN confirmation of the reactivation of SGR1900+14
  98. IPN detection of possible reactivation of SGR1900+14
  99. GRB021113, SPI ACS observation
  100. IPN triangulation of GRB021119 (annulus)

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