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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"

37620 results found.

  1. GRB 030528 (=H2724) Kyoto optical observation
  2. IPN triangulation of GRB030523B (annulus)
  3. GRB 030416: Optical Observations
  4. GRB 030329: Planned XMM-Newton Observation
  5. IPN triangulation of GRB030523 (annulus)
  6. GRB 030329: optical photometry at various french observatories
  7. GRB 030329: optical photometry at Belesta observatory (France)
  8. GRB 030329/SN 2003dh: Possible increase in brightness
  9. GRB 030329: HST ACS Observations of the Host
  10. GRB 030329 Optical Observations
  11. GRB 021004: HST observations
  12. GRB030324: Further Observations of the Candidate Optical Afterglow
  13. IPN triangulation of GRB030519B=H2716 (small error box)
  14. GRB 030418: Second Epoch Optical Observations with Magellan
  15. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  16. IPN triangulation of GRB030519 (annulus)
  17. IPN triangulation of GRB030518C (annulus)
  18. IPN triangulation of GRB030518B (annulus)
  19. IPN triangulation of GRB030518A (annulus)
  20. IPN triangulation of GRB030514 (annulus)
  21. IPN triangulation of GRB030513 (annulus)
  22. IPN triangulation of GRB030509B (annulus)
  23. GRB 030329: Optical limit (contemporaneous imaging)
  24. GRB 030501: final TAROT limits
  25. IPN triangulation of GRB030509 (small errror box)
  26. IPN triangulation of GRB030509 - correction
  27. IPN triangulation of GRB030509 (single error box)
  28. GRB030329: RTT150 optical observations
  29. GRB 030329: Optical limit (contemporaneous photography)
  30. GRB030418, BVRcIc field photometry
  31. GRB 030429: Redshift of neighbor galaxy
  32. GRB030429, BVRcIc field photometry
  33. GRB 030329: High-Resolution Spectroscopy of the Host
  34. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  35. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  36. GRB030429: RTT150 optical observations, a possible host galaxy
  37. IPN triangulation of GRB030506 (annulus)
  38. IPN triangulation of GRB030505B (large error box)
  39. IPN triangulation of GRB030505A (annulus)
  40. GRB030329: RTT150 optical observations and upper limit for a host
  41. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  42. GRB030501, optical observation
  43. GRB030501C triangulation (annulus)
  44. GRB030329: RTT150 optical observations and upper limit for a host
  45. GRB 030429: Radio Observations
  46. GRB 030429: redshift from VLT spectroscopy
  47. GRB 030429: IR photometry with IRSF/SIRIUS
  48. GRB030501B triangulation (single error box)
  49. GRB 030329 Optical Observations
  50. GRB 030329, BVRI photometry
  51. GRB 030501: TAROT possible candidate counterpart
  52. IPN triangulation of GRB030501 (IBIS event; annulus)
  53. IPN triangulation of GRB030501B (annulus)
  54. GRB 030429: confirmation of afterglow candidate
  55. GRB030429, possible optical counterpart
  56. GRB030501 localized by INTEGRAL
  57. GRB030425: CrAO optical observation
  58. IPN triangulation of GRB030429 (annulus)
  59. IPN triangulation of GRB030428 (two large error boxes)
  60. GRB 030329 Oprical observations in Rozhen observatory
  61. GRB 030429: ROTSE-III observations
  62. GRB 030324: Radio Observations
  63. GRB030329 observed as a sudden ionospheric disturbance (SID)
  64. IPN triangulation of GRB030426 (annulus)
  65. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  66. IPN triangulation of GRB030425 (single error box)
  67. GRB 030329, the review of the sky area in plate archive (1950-1998)
  68. GRB 030329: Spectral Evolution of SN 2003dh
  69. Optical Observations of GRB 030418 with Magellan
  70. GRB 030329: optical spectropolarimetry at VLT
  71. IPN triangulation of GRB030422C (annulus)
  72. IPN triangulation of GRB030422B (annulus)
  73. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  74. GRB030329: optical polarization
  75. IPN triangulation of GRB030422 (two large error boxes)
  76. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  77. IPN triangulation of GRB030421 (annulus)
  78. MASTER:optical observations GRB030418
  79. MASTER:optical observations probable GRB030414
  80. GRB030329: 444 AAVSO Measurements
  81. IPN triangulation of GRB030419 (annulus)
  82. MASTER:optical observations GRB030416
  83. ROTSE-III prompt optical detections of GRB 030418
  84. GRB030418: Upper limits from recent and historical observations.
  85. GRB030418: Kiso near infrared observations
  86. GRB 030418: Optical afterglow
  87. GRB 030418: Finder for afterglow candidate
  88. GRB 030418: Optical afterglow candidate
  89. GRB 030329 OT position
  90. OT GRB 030329: early UBVRcIc spectral evolution
  91. GRB030329, UBVRI polarimetry, R-polarization
  92. GRB 030329: SARA Optical Observations
  93. OT GRB 030329: early spectrum
  94. GRB030329: VR Photometry at TNG
  95. GRB030324: Candidate Optical Afterglow (Erratum)
  96. GRB030324: Candidate Optical Afterglow
  97. IPN triangulation of GRB030414 (small error box)
  98. GRB 030413: Optical Observations
  99. GRB 030329 Rc observations
  100. IPN triangulation of GRB030413 (small error box)

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