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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"

26565 results found.

  1. XRF030723(=H2777): Chandra Observations
  2. GRB030723: Upper limits from historical observations
  3. XRF030723: Palomar observations and proposed counterpart
  4. GRB030725 (=H2779): A Bright GRB Localized by HETE
  5. XRF030723: optical observations
  6. XRF030723, BVRcIc field photometry correction
  7. XRF030723, ROTSE-III Early Observations
  8. XRF030723, BVRcIc field photometry
  9. XRF 030723, optical observations
  10. XRF 030723, optical observations
  11. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  12. Konus-Wind detection of the bursts from SGR1806-20 region
  13. SGR 1806-20, submm observations
  14. RXTE PCA Observations of SGR1806-20 Region
  15. IPN triangulation of GRB030714 (two large error boxes)
  16. IPN triangulation of GRB030715 (two large error boxes)
  17. GRBlog: Compilation of all GCN Circ. data
  18. GRB030706 triangulation (single large error box)
  19. GRB030329, optical observation in May
  20. IPN triangulation of GRB030626 (single large error box)
  21. IPN triangulation of GRB030626 (two large error boxes)
  22. GRB030329: second XMM-Newton observation
  23. GRB030418: R optical observations
  24. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  25. IPN triangulation of GRB030606 (two alternate error boxes)
  26. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  27. GRB 030528: tentative NIR counterpart
  28. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  29. GRB030329, further radio observations at GMRT
  30. GRB030528, BVRI field photometry
  31. GRB030329, SPM optical observations
  32. GRB030528(=H2724): Revised SXC Localization
  33. GRB 030528 Bisei optical observation
  34. GRB030528 (H2724): A long GRB localized by HETE
  35. GRB 030329: Correction to GCN 2254
  36. GRB 030329: Optical Observations
  37. GRB 030528 (=H2724) Kyoto optical observation
  38. GRB030329, Optical observations
  39. GRB 030329: HST ACS Observations of the Host
  40. GRB 030329 Optical Observations
  41. GRB030329: XMM-Newton observation
  42. GRB 021004: HST observations
  43. GRB030324: Further Observations of the Candidate Optical Afterglow
  44. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  45. IPN triangulation of GRB030519B=H2716 (small error box)
  46. HETE GRB030329, correction to Rc Observations in Loiano
  47. GRB 030329: Optical limit (contemporaneous imaging)
  48. IPN triangulation of GRB030509 (small errror box)
  49. IPN triangulation of GRB030509 - correction
  50. GRB030429, refiend optical brightness
  51. GRB030418, BVRcIc field photometry
  52. GRB030429, BVRcIc field photometry
  53. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  54. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  55. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  56. GRB030429: RTT150 optical observations, a possible host galaxy
  57. GRB030329: RTT150 optical observations and upper limit for a host
  58. GRB030501 triangulation (correction to GCN 2194)
  59. GRB 030429: redshift from VLT spectroscopy
  60. GRB030501B triangulation (single error box)
  61. GRB030429: Optical Observations
  62. GRB030501: TAROT candidate afterglow present in archival images
  63. IPN triangulation of GRB030501 (IBIS event; annulus)
  64. GRB 030429: confirmation of afterglow candidate
  65. GRB030429, possible optical counterpart
  66. GRB030425: CrAO optical observation
  67. GRB 030329 Oprical observations in Rozhen observatory
  68. IPN triangulation of GRB030425 (single error box)
  69. GRB 030329, the review of the sky area in plate archive (1950-1998)
  70. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  71. GRB030329: optical polarization
  72. IPN triangulation of GRB030422 (two large error boxes)
  73. MASTER:optical observations GRB030418
  74. MASTER:optical observations probable GRB030414
  75. GRB030418: Kiso near infrared observations
  76. OT GRB 030329: early spectrum
  77. GRB030324: Candidate Optical Afterglow
  78. IPN triangulation of GRB030414 (small error box)
  79. IPN triangulation of GRB030413 (small error box)
  80. Superluminal motion in GRB 030329 (Correction)
  81. Superluminal motion in GRB 030329
  82. GRB030329, optical position
  83. IPN triangulation of GRB030406 (small error box)
  84. IPN triangulation of GRB050403 (small error box)
  85. GRB030329: HET spectroscopic monitoring
  86. Kiso observation of the GRB030329 at April 6
  87. GRB 030329, color evolution
  88. GRB030328, UBVRcIc field photometry
  89. GRB 030329 Optical observations
  90. GRB030329: Kiso B and R band observations
  91. GRB030329: More AAVSO VR obs
  92. GRB 030329: BV photographic observations
  93. SDSS 0.5m PT observations of GRB030329 (correction)
  94. SDSS 0.5m PT observations of GRB030329
  95. GRB 030329, nearby galaxies
  96. GRB030329: final R-band light curve by MASTER
  97. GRB030329, optical observation
  98. GRB030329, new UBVRcIc field photometry
  99. GRB 030329, light curve and SN prediction
  100. GRB030328: Full Observation, X-ray Fading and Spectrum Measured

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