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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"

42922 results found.

  1. GRB030528: Chandra TOO Planned
  2. GRB 030519B: optical observations.
  3. MASTER: optical observation GRB030601
  4. GRB030528(=H2724): Revised SXC Localization
  5. GRB 030329/SN 2003dh: Jitter Episode
  6. GRB 030528, Teramo optical observation
  7. GRB 030528 Bisei optical observation
  8. GRB030528 (H2724): A long GRB localized by HETE
  9. GRB 030329: Correction to GCN 2254
  10. GRB 030329: Optical Observations
  11. GRB 030528: Optical observations at RIKEN
  12. GRB 030528 (=H2724) Kyoto optical observation
  13. IPN triangulation of GRB030523B (annulus)
  14. GRB 030416: Optical Observations
  15. IPN triangulation of GRB030523 (annulus)
  16. GRB 030329: optical photometry at various french observatories
  17. GRB 030329: optical photometry at Belesta observatory (France)
  18. GRB030329, Optical observations
  19. GRB 030329/SN 2003dh: Possible increase in brightness
  20. GRB 030329: HST ACS Observations of the Host
  21. GRB030329: XMM-Newton observation
  22. GRB 021004: HST observations
  23. GRB030324: Further Observations of the Candidate Optical Afterglow
  24. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  25. IPN triangulation of GRB030519B=H2716 (small error box)
  26. GRB 030418: Second Epoch Optical Observations with Magellan
  27. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  28. IPN triangulation of GRB030519 (annulus)
  29. IPN triangulation of GRB030518C (annulus)
  30. IPN triangulation of GRB030518B (annulus)
  31. IPN triangulation of GRB030518A (annulus)
  32. IPN triangulation of GRB030514 (annulus)
  33. HETE GRB030329, correction to Rc Observations in Loiano
  34. IPN triangulation of GRB030513 (annulus)
  35. IPN triangulation of GRB030509B (annulus)
  36. GRB 030329: Optical limit (contemporaneous imaging)
  37. GRB 030501: final TAROT limits
  38. IPN triangulation of GRB030509 (small errror box)
  39. IPN triangulation of GRB030509 (single error box)
  40. GRB030329: RTT150 optical observations
  41. GRB030329, BVRI photometry
  42. GRB030429, refiend optical brightness
  43. GRB 030329: Optical limit (contemporaneous photography)
  44. GRB030418, BVRcIc field photometry
  45. GRB 030429: Redshift of neighbor galaxy
  46. GRB030429, BVRcIc field photometry
  47. GRB 030329: High-Resolution Spectroscopy of the Host
  48. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  49. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  50. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  51. GRB030429: RTT150 optical observations, a possible host galaxy
  52. IPN triangulation of GRB030506 (annulus)
  53. IPN triangulation of GRB030505B (large error box)
  54. IPN triangulation of GRB030505A (annulus)
  55. GRB030329: RTT150 optical observations and upper limit for a host
  56. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  57. GRB030501, optical observation
  58. GRB030501C triangulation (annulus)
  59. GRB030501 triangulation (correction to GCN 2194)
  60. GRB030329: RTT150 optical observations and upper limit for a host
  61. GRB 030429: Radio Observations
  62. GRB 030429: redshift from VLT spectroscopy
  63. GRB 030429: IR photometry with IRSF/SIRIUS
  64. GRB030501B triangulation (single error box)
  65. GRB 030329 Optical Observations
  66. GRB030328, optical observation
  67. GRB 030329, BVRI photometry
  68. GRB030429: Optical Observations
  69. GRB030501: TAROT candidate afterglow present in archival images
  70. GRB 030501: TAROT possible candidate counterpart
  71. IPN triangulation of GRB030501 (IBIS event; annulus)
  72. IPN triangulation of GRB030501B (annulus)
  73. GRB 030429: confirmation of afterglow candidate
  74. GRB030429, possible optical counterpart
  75. GRB030501 localized by INTEGRAL
  76. GRB030425: CrAO optical observation
  77. IPN triangulation of GRB030429 (annulus)
  78. IPN triangulation of GRB030428 (two large error boxes)
  79. GRB 030329 Oprical observations in Rozhen observatory
  80. GRB 030429: ROTSE-III observations
  81. GRB 030324: Radio Observations
  82. GRB030329 observed as a sudden ionospheric disturbance (SID)
  83. IPN triangulation of GRB030426 (annulus)
  84. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  85. IPN triangulation of GRB030425 (single error box)
  86. GRB030329, SPM optical observations (Correction)
  87. GRB030329, SPM optical observations
  88. GRB 030329, the review of the sky area in plate archive (1950-1998)
  89. GRB 030329: Spectral Evolution of SN 2003dh
  90. Optical Observations of GRB 030418 with Magellan
  91. GRB 030329: optical spectropolarimetry at VLT
  92. IPN triangulation of GRB030422C (annulus)
  93. IPN triangulation of GRB030422B (annulus)
  94. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  95. GRB030329: optical polarization
  96. IPN triangulation of GRB030422 (two large error boxes)
  97. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  98. GRB030329, optical observation
  99. IPN triangulation of GRB030421 (annulus)
  100. MASTER:optical observations GRB030418

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