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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"

37710 results found.

  1. GRB 021004: HST observations
  2. GRB030324: Further Observations of the Candidate Optical Afterglow
  3. IPN triangulation of GRB030519B=H2716 (small error box)
  4. GRB 030418: Second Epoch Optical Observations with Magellan
  5. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  6. IPN triangulation of GRB030519 (annulus)
  7. IPN triangulation of GRB030518C (annulus)
  8. IPN triangulation of GRB030518B (annulus)
  9. IPN triangulation of GRB030518A (annulus)
  10. IPN triangulation of GRB030514 (annulus)
  11. IPN triangulation of GRB030513 (annulus)
  12. IPN triangulation of GRB030509B (annulus)
  13. GRB 030329: Optical limit (contemporaneous imaging)
  14. GRB 030501: final TAROT limits
  15. IPN triangulation of GRB030509 (small errror box)
  16. IPN triangulation of GRB030509 - correction
  17. IPN triangulation of GRB030509 (single error box)
  18. GRB030329: RTT150 optical observations
  19. GRB 030329: Optical limit (contemporaneous photography)
  20. GRB030418, BVRcIc field photometry
  21. GRB 030429: Redshift of neighbor galaxy
  22. GRB030429, BVRcIc field photometry
  23. GRB 030329: High-Resolution Spectroscopy of the Host
  24. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  25. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  26. GRB030429: RTT150 optical observations, a possible host galaxy
  27. IPN triangulation of GRB030506 (annulus)
  28. IPN triangulation of GRB030505B (large error box)
  29. IPN triangulation of GRB030505A (annulus)
  30. GRB030329: RTT150 optical observations and upper limit for a host
  31. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  32. GRB030501, optical observation
  33. GRB030501C triangulation (annulus)
  34. GRB030329: RTT150 optical observations and upper limit for a host
  35. GRB 030429: Radio Observations
  36. GRB 030429: redshift from VLT spectroscopy
  37. GRB 030429: IR photometry with IRSF/SIRIUS
  38. GRB030501B triangulation (single error box)
  39. GRB 030329 Optical Observations
  40. GRB 030329, BVRI photometry
  41. GRB 030501: TAROT possible candidate counterpart
  42. IPN triangulation of GRB030501 (IBIS event; annulus)
  43. IPN triangulation of GRB030501B (annulus)
  44. GRB 030429: confirmation of afterglow candidate
  45. GRB030429, possible optical counterpart
  46. GRB030501 localized by INTEGRAL
  47. GRB030425: CrAO optical observation
  48. IPN triangulation of GRB030429 (annulus)
  49. IPN triangulation of GRB030428 (two large error boxes)
  50. GRB 030329 Oprical observations in Rozhen observatory
  51. GRB 030429: ROTSE-III observations
  52. GRB 030324: Radio Observations
  53. GRB030329 observed as a sudden ionospheric disturbance (SID)
  54. IPN triangulation of GRB030426 (annulus)
  55. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  56. IPN triangulation of GRB030425 (single error box)
  57. GRB 030329, the review of the sky area in plate archive (1950-1998)
  58. GRB 030329: Spectral Evolution of SN 2003dh
  59. Optical Observations of GRB 030418 with Magellan
  60. GRB 030329: optical spectropolarimetry at VLT
  61. IPN triangulation of GRB030422C (annulus)
  62. IPN triangulation of GRB030422B (annulus)
  63. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  64. GRB030329: optical polarization
  65. IPN triangulation of GRB030422 (two large error boxes)
  66. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  67. IPN triangulation of GRB030421 (annulus)
  68. MASTER:optical observations GRB030418
  69. MASTER:optical observations probable GRB030414
  70. GRB030329: 444 AAVSO Measurements
  71. IPN triangulation of GRB030419 (annulus)
  72. MASTER:optical observations GRB030416
  73. ROTSE-III prompt optical detections of GRB 030418
  74. GRB030418: Upper limits from recent and historical observations.
  75. GRB030418: Kiso near infrared observations
  76. GRB 030418: Optical afterglow
  77. GRB 030418: Finder for afterglow candidate
  78. GRB 030418: Optical afterglow candidate
  79. GRB 030329 OT position
  80. OT GRB 030329: early UBVRcIc spectral evolution
  81. GRB030329, UBVRI polarimetry, R-polarization
  82. GRB 030329: SARA Optical Observations
  83. OT GRB 030329: early spectrum
  84. GRB030329: VR Photometry at TNG
  85. GRB030324: Candidate Optical Afterglow (Erratum)
  86. GRB030324: Candidate Optical Afterglow
  87. IPN triangulation of GRB030414 (small error box)
  88. GRB 030413: Optical Observations
  89. GRB 030329 Rc observations
  90. IPN triangulation of GRB030413 (small error box)
  91. IPN triangulation of GRB030410 (annulus)
  92. Superluminal motion in GRB 030329 (Correction)
  93. Superluminal motion in GRB 030329
  94. GRB 030329 and SN 2003dh
  95. GRB030329, optical position
  96. GRB 030329 VLBA Observations
  97. IPN triangulation of GRB030406 (small error box)
  98. IPN triangulation of GRB050403 (small error box)
  99. IPN triangulation of GRB030403 (annulus)
  100. GRB 030329: BVRI photometry at Asiago

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